{"title":"Hex Head Wood Screws (DIN 571) - Marine Stainless Steel (A4)","description":"\u003cstyle\u003e.fk-wrap{font-family:Arial,sans-serif;color:#1a1a1a;max-width:1200px;margin:0 auto}.fk-hero{background:#fff;padding:36px 0 28px;margin-bottom:32px;border-bottom:2px solid #e8edf2}.fk-hero-inner{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:24px}.fk-hero-text h1{font-size:2rem;font-weight:700;margin:0 0 8px;color:#1a3a5c}.fk-subtitle{font-size:1rem;color:#1a6b8a;margin:0 0 16px;font-weight:600}.fk-hero-text p{font-size:0.95rem;color:#444;max-width:620px;line-height:1.7;margin:0 0 24px}.fk-cta-btn{display:inline-block;background:#e8a020;color:#fff;font-weight:700;padding:12px 28px;border-radius:6px;text-decoration:none;font-size:0.95rem;letter-spacing:0.5px}.fk-badge{display:inline-block;background:#e8f4fb;color:#1a6b8a;border:1px solid #b0d8ee;border-radius:4px;font-size:0.78rem;font-weight:700;padding:3px 10px;margin-right:6px;margin-bottom:8px}.fk-section{margin-bottom:40px}.fk-section h2{font-size:1.4rem;font-weight:700;color:#1a3a5c;border-left:4px solid #1a6b8a;padding-left:12px;margin-bottom:20px}.fk-features{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:16px}.fk-feature-card{background:#f0f7fb;border:1px solid #c8e0ee;border-radius:8px;padding:20px;display:flex;align-items:flex-start;gap:14px}.fk-feature-icon{font-size:1.8rem;flex-shrink:0}.fk-feature-card h4{font-size:0.95rem;font-weight:700;color:#1a3a5c;margin:0 0 4px}.fk-feature-card p{font-size:0.85rem;color:#555;margin:0;line-height:1.5}.fk-table-wrap{overflow-x:auto;border-radius:8px;box-shadow:0 1px 4px rgba(0,0,0,0.08)}.fk-table{width:100%;border-collapse:collapse;font-size:0.88rem}.fk-table th{background:#1a3a5c;color:#fff;padding:10px 14px;text-align:center;white-space:nowrap;font-weight:600}.fk-table td{padding:9px 14px;text-align:center;border-bottom:1px solid #e8edf2;white-space:nowrap}.fk-table tr:nth-child(even) td{background:#f0f7fb}.fk-table tr:hover td{background:#daeef8}.fk-avail{color:#1a7a3c;font-weight:700}.fk-na{color:#ccc}.fk-apps{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:16px}.fk-app-card{background:#f0f7fb;border:1px solid #c8e0ee;border-radius:8px;padding:18px;display:flex;gap:12px;align-items:flex-start}.fk-app-icon{font-size:1.6rem;flex-shrink:0}.fk-app-card h4{font-size:0.9rem;font-weight:700;color:#1a3a5c;margin:0 0 4px}.fk-app-card p{font-size:0.82rem;color:#555;margin:0;line-height:1.5}.fk-two-col{display:grid;grid-template-columns:1fr 1fr;gap:24px}.fk-box{background:#f0f7fb;border:1px solid #c8e0ee;border-radius:8px;padding:20px}.fk-box h3{font-size:1rem;font-weight:700;color:#1a3a5c;margin:0 0 12px}.fk-box ul{margin:0;padding-left:18px}.fk-box ul li{font-size:0.88rem;color:#444;margin-bottom:6px;line-height:1.5}.fk-certs{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:12px}.fk-cert-card{background:#f0f7fb;border:1px solid #c8e0ee;border-radius:8px;padding:14px 18px;display:flex;align-items:center;gap:10px}.fk-cert-icon{font-size:1.4rem}.fk-cert-card div{font-size:0.85rem}.fk-cert-card strong{display:block;color:#1a3a5c;font-weight:700}.fk-compare{display:grid;grid-template-columns:1fr 1fr;gap:20px}.fk-compare-card{border-radius:8px;padding:20px;border:2px solid #c8e0ee}.fk-compare-card.active{border-color:#1a6b8a;background:#e8f4fb}.fk-compare-card.muted{border-color:#e0e0e0;background:#fafafa}.fk-compare-card h4{font-size:1rem;font-weight:700;color:#1a3a5c;margin:0 0 10px}.fk-compare-card ul{margin:0;padding-left:16px}.fk-compare-card ul li{font-size:0.85rem;color:#444;margin-bottom:5px;line-height:1.5}.fk-faq{border:1px solid #c8e0ee;border-radius:8px;overflow:hidden}.fk-faq-item{border-bottom:1px solid #c8e0ee}.fk-faq-item:last-child{border-bottom:none}.fk-faq-q{background:#f0f7fb;padding:14px 18px;font-weight:700;color:#1a3a5c;font-size:0.92rem}.fk-faq-a{padding:14px 18px;font-size:0.88rem;color:#444;line-height:1.6;background:#fff}.fk-breadcrumb{font-size:0.82rem;color:#888;margin-bottom:20px}.fk-breadcrumb a{color:#1a6b8a;text-decoration:none}.fk-breadcrumb span{margin:0 6px}.fk-highlight-box{background:#e8f4fb;border:1px solid #1a6b8a;border-radius:8px;padding:18px 22px;margin-bottom:32px;font-size:0.9rem;color:#1a3a5c;line-height:1.7}@media(max-width:640px){.fk-two-col,.fk-compare{grid-template-columns:1fr}.fk-hero-text h1{font-size:1.4rem}}\u003c\/style\u003e\u003cdiv class=\"fk-wrap\"\u003e\n\u003cp class=\"fk-breadcrumb\"\u003e\u003ca href=\"\/\"\u003eHome\u003c\/a\u003e\u003cspan\u003e›\u003c\/span\u003e\u003ca href=\"\/collections\/fasteners\"\u003eFasteners\u003c\/a\u003e\u003cspan\u003e›\u003c\/span\u003e\u003ca href=\"\/collections\/wood-screws\"\u003eWood Screws\u003c\/a\u003e\u003cspan\u003e›\u003c\/span\u003e\u003ca href=\"\/collections\/din-571\"\u003eDIN 571\u003c\/a\u003e\u003cspan\u003e›\u003c\/span\u003eA4 Marine Stainless Steel\u003c\/p\u003e\n\u003cdiv class=\"fk-hero\"\u003e\u003cdiv class=\"fk-hero-inner\"\u003e\n\u003cdiv class=\"fk-hero-text\"\u003e\n\u003ch1\u003eHex Head Wood Screws — DIN 571\u003c\/h1\u003e\n\u003cp class=\"fk-subtitle\"\u003eMarine Stainless Steel A4 (SUS316) · Grade A4-70 · Passivated Finish\u003c\/p\u003e\n\u003cdiv\u003e\n\u003cspan class=\"fk-badge\"\u003eDIN 571\u003c\/span\u003e\u003cspan class=\"fk-badge\"\u003eISO 3506-1\u003c\/span\u003e\u003cspan class=\"fk-badge\"\u003eA4-70\u003c\/span\u003e\u003cspan class=\"fk-badge\"\u003eSUS316 \/ 1.4401\u003c\/span\u003e\u003cspan class=\"fk-badge\"\u003eRoHS Compliant\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cp\u003ePremium marine-grade hex head lag screws conforming to DIN 571 standard. Manufactured in A4 stainless steel (SUS316 \/ 1.4401) with molybdenum content for superior resistance to chloride corrosion, saltwater, and aggressive chemical environments. The preferred choice for marine construction, coastal infrastructure, and demanding industrial applications.\u003c\/p\u003e\n\u003ca class=\"fk-cta-btn\" href=\"\/pages\/contact\"\u003eRequest a Quote\u003c\/a\u003e\n\u003c\/div\u003e\n\u003csvg width=\"160\" height=\"80\" viewbox=\"0 0 180 100\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003crect x=\"10\" y=\"38\" width=\"30\" height=\"24\" rx=\"2\" fill=\"#b0d8ee\" stroke=\"#1a3a5c\" stroke-width=\"1.5\"\u003e\u003c\/rect\u003e\u003cpolygon points=\"10,38 25,28 40,38\" fill=\"#7ab8d8\" stroke=\"#1a3a5c\" stroke-width=\"1\"\u003e\u003c\/polygon\u003e\u003cpolygon points=\"10,62 25,72 40,62\" fill=\"#7ab8d8\" stroke=\"#1a3a5c\" stroke-width=\"1\"\u003e\u003c\/polygon\u003e\u003crect x=\"40\" y=\"46\" width=\"120\" height=\"8\" rx=\"2\" fill=\"#b0d8ee\" stroke=\"#1a3a5c\" stroke-width=\"0.5\"\u003e\u003c\/rect\u003e\u003cpolygon points=\"155,42 170,50 155,58\" fill=\"#e8a020\"\u003e\u003c\/polygon\u003e\u003ctext x=\"90\" y=\"90\" fill=\"#1a6b8a\" font-size=\"10\" text-anchor=\"middle\" font-family=\"Arial\"\u003eDIN 571 · A4 Marine Stainless Steel\u003c\/text\u003e\u003c\/svg\u003e\n\u003c\/div\u003e\u003c\/div\u003e\n\u003cdiv class=\"fk-highlight-box\"\u003e⚓ \u003cstrong\u003eWhy A4 Marine Grade?\u003c\/strong\u003e Unlike standard A2 (SUS304), A4 stainless steel contains 2–3% molybdenum (Mo), which dramatically improves resistance to pitting and crevice corrosion in chloride-rich environments such as seawater, de-icing salts, and industrial chemicals. A4-70 is the recommended grade for all marine, coastal, and chemically aggressive applications.\u003c\/div\u003e\n\u003cdiv class=\"fk-section\"\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cdiv class=\"fk-features\"\u003e\n\u003cdiv class=\"fk-feature-card\"\u003e\n\u003cdiv class=\"fk-feature-icon\"\u003e⚓\u003c\/div\u003e\n\u003cdiv\u003e\n\u003ch4\u003eMarine Grade A4 (SUS316)\u003c\/h4\u003e\n\u003cp\u003eContains 2–3% molybdenum for superior chloride and saltwater corrosion resistance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"fk-feature-card\"\u003e\n\u003cdiv class=\"fk-feature-icon\"\u003e📐\u003c\/div\u003e\n\u003cdiv\u003e\n\u003ch4\u003eDIN 571 Standard\u003c\/h4\u003e\n\u003cp\u003eFully compliant with DIN 571 hex head wood screw dimensional standard.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"fk-feature-card\"\u003e\n\u003cdiv class=\"fk-feature-icon\"\u003e⚡\u003c\/div\u003e\n\u003cdiv\u003e\n\u003ch4\u003eGrade A4-70\u003c\/h4\u003e\n\u003cp\u003eMinimum tensile strength 700 MPa per ISO 3506-1.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"fk-feature-card\"\u003e\n\u003cdiv class=\"fk-feature-icon\"\u003e✨\u003c\/div\u003e\n\u003cdiv\u003e\n\u003ch4\u003ePassivated Surface\u003c\/h4\u003e\n\u003cp\u003eClean passivation finish — no coating, maintains natural stainless appearance and maximum corrosion resistance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"fk-feature-card\"\u003e\n\u003cdiv class=\"fk-feature-icon\"\u003e🔧\u003c\/div\u003e\n\u003cdiv\u003e\n\u003ch4\u003eExternal Hex Drive\u003c\/h4\u003e\n\u003cp\u003eWS8 to WS24 hex drive for high-torque installation with standard metric wrenches.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"fk-feature-card\"\u003e\n\u003cdiv class=\"fk-feature-icon\"\u003e📏\u003c\/div\u003e\n\u003cdiv\u003e\n\u003ch4\u003eWide Size Range\u003c\/h4\u003e\n\u003cp\u003eM5 to M16, lengths from 20 mm to 300 mm. Custom lengths available on request.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"fk-section\"\u003e\n\u003ch2\u003eDimensional Specifications — DIN 571\u003c\/h2\u003e\n\u003cp style=\"font-size:0.88rem;color:#555;margin-bottom:12px\"\u003eAll dimensions conform to DIN 571 standard. Tolerances per ISO 4759-1.\u003c\/p\u003e\n\u003cdiv class=\"fk-table-wrap\"\u003e\u003ctable class=\"fk-table\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eNominal Diameter (d)\u003c\/th\u003e\n\u003cth\u003eThread Pitch (p)\u003c\/th\u003e\n\u003cth\u003eHead Height (k)\u003c\/th\u003e\n\u003cth\u003eHead Width A\/F (s)\u003c\/th\u003e\n\u003cth\u003eWrench Size\u003c\/th\u003e\n\u003cth\u003eMin. Length\u003c\/th\u003e\n\u003cth\u003eMax. Length\u003c\/th\u003e\n\u003cth\u003ePoint Type\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eM5\u003c\/td\u003e\n\u003ctd\u003e2.0 mm\u003c\/td\u003e\n\u003ctd\u003e3.5 mm\u003c\/td\u003e\n\u003ctd\u003e8 mm\u003c\/td\u003e\n\u003ctd\u003eWS8\u003c\/td\u003e\n\u003ctd\u003e20 mm\u003c\/td\u003e\n\u003ctd\u003e60 mm\u003c\/td\u003e\n\u003ctd\u003eGimlet Point\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eM6\u003c\/td\u003e\n\u003ctd\u003e2.5 mm\u003c\/td\u003e\n\u003ctd\u003e4.0 mm\u003c\/td\u003e\n\u003ctd\u003e10 mm\u003c\/td\u003e\n\u003ctd\u003eWS10\u003c\/td\u003e\n\u003ctd\u003e20 mm\u003c\/td\u003e\n\u003ctd\u003e140 mm\u003c\/td\u003e\n\u003ctd\u003eGimlet Point\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eM8\u003c\/td\u003e\n\u003ctd\u003e3.0 mm\u003c\/td\u003e\n\u003ctd\u003e5.5 mm\u003c\/td\u003e\n\u003ctd\u003e13 mm\u003c\/td\u003e\n\u003ctd\u003eWS13\u003c\/td\u003e\n\u003ctd\u003e25 mm\u003c\/td\u003e\n\u003ctd\u003e200 mm\u003c\/td\u003e\n\u003ctd\u003eGimlet Point\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eM10\u003c\/td\u003e\n\u003ctd\u003e3.5 mm\u003c\/td\u003e\n\u003ctd\u003e7.0 mm\u003c\/td\u003e\n\u003ctd\u003e17 mm\u003c\/td\u003e\n\u003ctd\u003eWS17\u003c\/td\u003e\n\u003ctd\u003e30 mm\u003c\/td\u003e\n\u003ctd\u003e200 mm\u003c\/td\u003e\n\u003ctd\u003eGimlet Point\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eM12\u003c\/td\u003e\n\u003ctd\u003e4.0 mm\u003c\/td\u003e\n\u003ctd\u003e8.0 mm\u003c\/td\u003e\n\u003ctd\u003e19 mm\u003c\/td\u003e\n\u003ctd\u003eWS19\u003c\/td\u003e\n\u003ctd\u003e40 mm\u003c\/td\u003e\n\u003ctd\u003e250 mm\u003c\/td\u003e\n\u003ctd\u003eGimlet Point\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eM16\u003c\/td\u003e\n\u003ctd\u003e5.0 mm\u003c\/td\u003e\n\u003ctd\u003e10.0 mm\u003c\/td\u003e\n\u003ctd\u003e24 mm\u003c\/td\u003e\n\u003ctd\u003eWS24\u003c\/td\u003e\n\u003ctd\u003e60 mm\u003c\/td\u003e\n\u003ctd\u003e300 mm\u003c\/td\u003e\n\u003ctd\u003eGimlet Point\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"fk-section\"\u003e\n\u003ch2\u003eAvailable Sizes Matrix — A4 Marine Stainless Steel\u003c\/h2\u003e\n\u003cp style=\"font-size:0.88rem;color:#555;margin-bottom:12px\"\u003e\u003cspan style=\"color:#1a7a3c;font-weight:700\"\u003e✓\u003c\/span\u003e = Standard stock size  |  — = Available on request (MOQ applies)\u003c\/p\u003e\n\u003cdiv class=\"fk-table-wrap\"\u003e\u003ctable class=\"fk-table\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eØ \\ Length\u003c\/th\u003e\n\u003cth\u003e20\u003c\/th\u003e\n\u003cth\u003e25\u003c\/th\u003e\n\u003cth\u003e30\u003c\/th\u003e\n\u003cth\u003e35\u003c\/th\u003e\n\u003cth\u003e40\u003c\/th\u003e\n\u003cth\u003e45\u003c\/th\u003e\n\u003cth\u003e50\u003c\/th\u003e\n\u003cth\u003e55\u003c\/th\u003e\n\u003cth\u003e60\u003c\/th\u003e\n\u003cth\u003e65\u003c\/th\u003e\n\u003cth\u003e70\u003c\/th\u003e\n\u003cth\u003e75\u003c\/th\u003e\n\u003cth\u003e80\u003c\/th\u003e\n\u003cth\u003e90\u003c\/th\u003e\n\u003cth\u003e100\u003c\/th\u003e\n\u003cth\u003e110\u003c\/th\u003e\n\u003cth\u003e120\u003c\/th\u003e\n\u003cth\u003e130\u003c\/th\u003e\n\u003cth\u003e140\u003c\/th\u003e\n\u003cth\u003e150\u003c\/th\u003e\n\u003cth\u003e160\u003c\/th\u003e\n\u003cth\u003e180\u003c\/th\u003e\n\u003cth\u003e200\u003c\/th\u003e\n\u003cth\u003e220\u003c\/th\u003e\n\u003cth\u003e250\u003c\/th\u003e\n\u003cth\u003e300\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eM5\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd class=\"fk-avail\"\u003e✓\u003c\/td\u003e\n\u003ctd class=\"fk-avail\"\u003e✓\u003c\/td\u003e\n\u003ctd class=\"fk-avail\"\u003e✓\u003c\/td\u003e\n\u003ctd class=\"fk-avail\"\u003e✓\u003c\/td\u003e\n\u003ctd class=\"fk-avail\"\u003e✓\u003c\/td\u003e\n\u003ctd class=\"fk-avail\"\u003e✓\u003c\/td\u003e\n\u003ctd class=\"fk-avail\"\u003e✓\u003c\/td\u003e\n\u003ctd class=\"fk-avail\"\u003e✓\u003c\/td\u003e\n\u003ctd class=\"fk-avail\"\u003e✓\u003c\/td\u003e\n\u003ctd class=\"fk-na\"\u003e—\u003c\/td\u003e\n\u003ctd class=\"fk-na\"\u003e—\u003c\/td\u003e\n\u003ctd class=\"fk-na\"\u003e—\u003c\/td\u003e\n\u003ctd class=\"fk-na\"\u003e—\u003c\/td\u003e\n\u003ctd class=\"fk-na\"\u003e—\u003c\/td\u003e\n\u003ctd class=\"fk-na\"\u003e—\u003c\/td\u003e\n\u003ctd class=\"fk-na\"\u003e—\u003c\/td\u003e\n\u003ctd class=\"fk-na\"\u003e—\u003c\/td\u003e\n\u003ctd class=\"fk-na\"\u003e—\u003c\/td\u003e\n\u003ctd class=\"fk-na\"\u003e—\u003c\/td\u003e\n\u003ctd class=\"fk-na\"\u003e—\u003c\/td\u003e\n\u003ctd class=\"fk-na\"\u003e—\u003c\/td\u003e\n\u003ctd class=\"fk-na\"\u003e—\u003c\/td\u003e\n\u003ctd class=\"fk-na\"\u003e—\u003c\/td\u003e\n\u003ctd class=\"fk-na\"\u003e—\u003c\/td\u003e\n\u003ctd class=\"fk-na\"\u003e—\u003c\/td\u003e\n\u003ctd class=\"fk-na\"\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eM6\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd class=\"fk-avail\"\u003e✓\u003c\/td\u003e\n\u003ctd class=\"fk-avail\"\u003e✓\u003c\/td\u003e\n\u003ctd class=\"fk-avail\"\u003e✓\u003c\/td\u003e\n\u003ctd class=\"fk-avail\"\u003e✓\u003c\/td\u003e\n\u003ctd class=\"fk-avail\"\u003e✓\u003c\/td\u003e\n\u003ctd class=\"fk-avail\"\u003e✓\u003c\/td\u003e\n\u003ctd class=\"fk-avail\"\u003e✓\u003c\/td\u003e\n\u003ctd class=\"fk-avail\"\u003e✓\u003c\/td\u003e\n\u003ctd class=\"fk-avail\"\u003e✓\u003c\/td\u003e\n\u003ctd class=\"fk-avail\"\u003e✓\u003c\/td\u003e\n\u003ctd class=\"fk-avail\"\u003e✓\u003c\/td\u003e\n\u003ctd class=\"fk-na\"\u003e—\u003c\/td\u003e\n\u003ctd class=\"fk-avail\"\u003e✓\u003c\/td\u003e\n\u003ctd class=\"fk-avail\"\u003e✓\u003c\/td\u003e\n\u003ctd class=\"fk-avail\"\u003e✓\u003c\/td\u003e\n\u003ctd class=\"fk-avail\"\u003e✓\u003c\/td\u003e\n\u003ctd class=\"fk-avail\"\u003e✓\u003c\/td\u003e\n\u003ctd class=\"fk-avail\"\u003e✓\u003c\/td\u003e\n\u003ctd class=\"fk-avail\"\u003e✓\u003c\/td\u003e\n\u003ctd class=\"fk-na\"\u003e—\u003c\/td\u003e\n\u003ctd class=\"fk-na\"\u003e—\u003c\/td\u003e\n\u003ctd class=\"fk-na\"\u003e—\u003c\/td\u003e\n\u003ctd class=\"fk-na\"\u003e—\u003c\/td\u003e\n\u003ctd class=\"fk-na\"\u003e—\u003c\/td\u003e\n\u003ctd class=\"fk-na\"\u003e—\u003c\/td\u003e\n\u003ctd class=\"fk-na\"\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eM8\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd class=\"fk-na\"\u003e—\u003c\/td\u003e\n\u003ctd class=\"fk-avail\"\u003e✓\u003c\/td\u003e\n\u003ctd class=\"fk-avail\"\u003e✓\u003c\/td\u003e\n\u003ctd class=\"fk-avail\"\u003e✓\u003c\/td\u003e\n\u003ctd class=\"fk-avail\"\u003e✓\u003c\/td\u003e\n\u003ctd class=\"fk-avail\"\u003e✓\u003c\/td\u003e\n\u003ctd class=\"fk-avail\"\u003e✓\u003c\/td\u003e\n\u003ctd class=\"fk-avail\"\u003e✓\u003c\/td\u003e\n\u003ctd class=\"fk-avail\"\u003e✓\u003c\/td\u003e\n\u003ctd class=\"fk-avail\"\u003e✓\u003c\/td\u003e\n\u003ctd class=\"fk-avail\"\u003e✓\u003c\/td\u003e\n\u003ctd class=\"fk-avail\"\u003e✓\u003c\/td\u003e\n\u003ctd class=\"fk-avail\"\u003e✓\u003c\/td\u003e\n\u003ctd class=\"fk-avail\"\u003e✓\u003c\/td\u003e\n\u003ctd class=\"fk-avail\"\u003e✓\u003c\/td\u003e\n\u003ctd class=\"fk-na\"\u003e—\u003c\/td\u003e\n\u003ctd class=\"fk-na\"\u003e—\u003c\/td\u003e\n\u003ctd class=\"fk-na\"\u003e—\u003c\/td\u003e\n\u003ctd class=\"fk-na\"\u003e—\u003c\/td\u003e\n\u003ctd class=\"fk-na\"\u003e—\u003c\/td\u003e\n\u003ctd class=\"fk-na\"\u003e—\u003c\/td\u003e\n\u003ctd class=\"fk-na\"\u003e—\u003c\/td\u003e\n\u003ctd class=\"fk-avail\"\u003e✓\u003c\/td\u003e\n\u003ctd class=\"fk-na\"\u003e—\u003c\/td\u003e\n\u003ctd class=\"fk-na\"\u003e—\u003c\/td\u003e\n\u003ctd class=\"fk-na\"\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eM10\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd class=\"fk-na\"\u003e—\u003c\/td\u003e\n\u003ctd class=\"fk-na\"\u003e—\u003c\/td\u003e\n\u003ctd class=\"fk-avail\"\u003e✓\u003c\/td\u003e\n\u003ctd class=\"fk-avail\"\u003e✓\u003c\/td\u003e\n\u003ctd class=\"fk-avail\"\u003e✓\u003c\/td\u003e\n\u003ctd class=\"fk-avail\"\u003e✓\u003c\/td\u003e\n\u003ctd class=\"fk-avail\"\u003e✓\u003c\/td\u003e\n\u003ctd class=\"fk-na\"\u003e—\u003c\/td\u003e\n\u003ctd class=\"fk-avail\"\u003e✓\u003c\/td\u003e\n\u003ctd class=\"fk-na\"\u003e—\u003c\/td\u003e\n\u003ctd class=\"fk-avail\"\u003e✓\u003c\/td\u003e\n\u003ctd class=\"fk-na\"\u003e—\u003c\/td\u003e\n\u003ctd class=\"fk-avail\"\u003e✓\u003c\/td\u003e\n\u003ctd class=\"fk-avail\"\u003e✓\u003c\/td\u003e\n\u003ctd class=\"fk-avail\"\u003e✓\u003c\/td\u003e\n\u003ctd class=\"fk-na\"\u003e—\u003c\/td\u003e\n\u003ctd class=\"fk-avail\"\u003e✓\u003c\/td\u003e\n\u003ctd class=\"fk-na\"\u003e—\u003c\/td\u003e\n\u003ctd class=\"fk-na\"\u003e—\u003c\/td\u003e\n\u003ctd class=\"fk-avail\"\u003e✓\u003c\/td\u003e\n\u003ctd class=\"fk-na\"\u003e—\u003c\/td\u003e\n\u003ctd class=\"fk-avail\"\u003e✓\u003c\/td\u003e\n\u003ctd class=\"fk-avail\"\u003e✓\u003c\/td\u003e\n\u003ctd class=\"fk-na\"\u003e—\u003c\/td\u003e\n\u003ctd class=\"fk-na\"\u003e—\u003c\/td\u003e\n\u003ctd class=\"fk-na\"\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eM12\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd class=\"fk-na\"\u003e—\u003c\/td\u003e\n\u003ctd class=\"fk-na\"\u003e—\u003c\/td\u003e\n\u003ctd class=\"fk-na\"\u003e—\u003c\/td\u003e\n\u003ctd class=\"fk-na\"\u003e—\u003c\/td\u003e\n\u003ctd class=\"fk-avail\"\u003e✓\u003c\/td\u003e\n\u003ctd class=\"fk-na\"\u003e—\u003c\/td\u003e\n\u003ctd class=\"fk-avail\"\u003e✓\u003c\/td\u003e\n\u003ctd class=\"fk-na\"\u003e—\u003c\/td\u003e\n\u003ctd class=\"fk-avail\"\u003e✓\u003c\/td\u003e\n\u003ctd class=\"fk-na\"\u003e—\u003c\/td\u003e\n\u003ctd class=\"fk-avail\"\u003e✓\u003c\/td\u003e\n\u003ctd class=\"fk-na\"\u003e—\u003c\/td\u003e\n\u003ctd class=\"fk-avail\"\u003e✓\u003c\/td\u003e\n\u003ctd class=\"fk-avail\"\u003e✓\u003c\/td\u003e\n\u003ctd class=\"fk-avail\"\u003e✓\u003c\/td\u003e\n\u003ctd class=\"fk-na\"\u003e—\u003c\/td\u003e\n\u003ctd class=\"fk-avail\"\u003e✓\u003c\/td\u003e\n\u003ctd class=\"fk-na\"\u003e—\u003c\/td\u003e\n\u003ctd class=\"fk-na\"\u003e—\u003c\/td\u003e\n\u003ctd class=\"fk-avail\"\u003e✓\u003c\/td\u003e\n\u003ctd class=\"fk-na\"\u003e—\u003c\/td\u003e\n\u003ctd class=\"fk-avail\"\u003e✓\u003c\/td\u003e\n\u003ctd class=\"fk-avail\"\u003e✓\u003c\/td\u003e\n\u003ctd class=\"fk-na\"\u003e—\u003c\/td\u003e\n\u003ctd class=\"fk-avail\"\u003e✓\u003c\/td\u003e\n\u003ctd class=\"fk-na\"\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eM16\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd class=\"fk-na\"\u003e—\u003c\/td\u003e\n\u003ctd class=\"fk-na\"\u003e—\u003c\/td\u003e\n\u003ctd class=\"fk-na\"\u003e—\u003c\/td\u003e\n\u003ctd class=\"fk-na\"\u003e—\u003c\/td\u003e\n\u003ctd class=\"fk-na\"\u003e—\u003c\/td\u003e\n\u003ctd class=\"fk-na\"\u003e—\u003c\/td\u003e\n\u003ctd class=\"fk-na\"\u003e—\u003c\/td\u003e\n\u003ctd class=\"fk-na\"\u003e—\u003c\/td\u003e\n\u003ctd class=\"fk-avail\"\u003e✓\u003c\/td\u003e\n\u003ctd class=\"fk-na\"\u003e—\u003c\/td\u003e\n\u003ctd class=\"fk-avail\"\u003e✓\u003c\/td\u003e\n\u003ctd class=\"fk-na\"\u003e—\u003c\/td\u003e\n\u003ctd class=\"fk-avail\"\u003e✓\u003c\/td\u003e\n\u003ctd class=\"fk-avail\"\u003e✓\u003c\/td\u003e\n\u003ctd class=\"fk-avail\"\u003e✓\u003c\/td\u003e\n\u003ctd class=\"fk-na\"\u003e—\u003c\/td\u003e\n\u003ctd class=\"fk-avail\"\u003e✓\u003c\/td\u003e\n\u003ctd class=\"fk-na\"\u003e—\u003c\/td\u003e\n\u003ctd class=\"fk-na\"\u003e—\u003c\/td\u003e\n\u003ctd class=\"fk-avail\"\u003e✓\u003c\/td\u003e\n\u003ctd class=\"fk-na\"\u003e—\u003c\/td\u003e\n\u003ctd class=\"fk-avail\"\u003e✓\u003c\/td\u003e\n\u003ctd class=\"fk-avail\"\u003e✓\u003c\/td\u003e\n\u003ctd class=\"fk-na\"\u003e—\u003c\/td\u003e\n\u003ctd class=\"fk-avail\"\u003e✓\u003c\/td\u003e\n\u003ctd class=\"fk-avail\"\u003e✓\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"fk-section\"\u003e\n\u003ch2\u003eMechanical Properties — A4-70 Grade\u003c\/h2\u003e\n\u003cp style=\"font-size:0.88rem;color:#555;margin-bottom:12px\"\u003eAll values per ISO 3506-1. Test performed at room temperature.\u003c\/p\u003e\n\u003cdiv class=\"fk-table-wrap\"\u003e\u003ctable class=\"fk-table\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eProperty\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003cth\u003eTest Standard\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial Grade\u003c\/td\u003e\n\u003ctd\u003eA4 (SUS316 \/ 1.4401)\u003c\/td\u003e\n\u003ctd\u003eISO 3506-1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStrength Grade\u003c\/td\u003e\n\u003ctd\u003eA4-70\u003c\/td\u003e\n\u003ctd\u003eISO 3506-1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMin. Tensile Strength\u003c\/td\u003e\n\u003ctd\u003e700 MPa\u003c\/td\u003e\n\u003ctd\u003eISO 3506-1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMin. Yield Strength (0.2% proof)\u003c\/td\u003e\n\u003ctd\u003e450 MPa\u003c\/td\u003e\n\u003ctd\u003eISO 3506-1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMin. Elongation\u003c\/td\u003e\n\u003ctd\u003e20%\u003c\/td\u003e\n\u003ctd\u003eISO 3506-1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHardness (max)\u003c\/td\u003e\n\u003ctd\u003e250 HV\u003c\/td\u003e\n\u003ctd\u003eISO 3506-1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSurface Treatment\u003c\/td\u003e\n\u003ctd\u003ePassivated\u003c\/td\u003e\n\u003ctd\u003eASTM A967 \/ ISO 16048\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMagnetic Properties\u003c\/td\u003e\n\u003ctd\u003eSlightly magnetic (work-hardened)\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temperature\u003c\/td\u003e\n\u003ctd\u003e−200°C to +400°C\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCorrosion Resistance\u003c\/td\u003e\n\u003ctd\u003eExcellent (C4\/C5 \/ marine environment)\u003c\/td\u003e\n\u003ctd\u003eISO 12944\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePitting Resistance (PRE)\u003c\/td\u003e\n\u003ctd\u003e≥ 24 (Mo-enhanced)\u003c\/td\u003e\n\u003ctd\u003eASTM G48\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"fk-section\"\u003e\n\u003ch2\u003eChemical Composition — SUS316 \/ 1.4401 (A4 Marine Stainless Steel)\u003c\/h2\u003e\n\u003cdiv class=\"fk-table-wrap\"\u003e\u003ctable class=\"fk-table\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eElement\u003c\/th\u003e\n\u003cth\u003eMin %\u003c\/th\u003e\n\u003cth\u003eMax %\u003c\/th\u003e\n\u003cth\u003eRole\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eChromium (Cr)\u003c\/td\u003e\n\u003ctd\u003e16.5\u003c\/td\u003e\n\u003ctd\u003e18.5\u003c\/td\u003e\n\u003ctd\u003ePrimary corrosion resistance\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNickel (Ni)\u003c\/td\u003e\n\u003ctd\u003e10.0\u003c\/td\u003e\n\u003ctd\u003e13.0\u003c\/td\u003e\n\u003ctd\u003eAustenitic structure stability\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMolybdenum (Mo)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e2.0\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e2.5\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eChloride \/ pitting resistance ★\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCarbon (C)\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003ctd\u003e0.07\u003c\/td\u003e\n\u003ctd\u003eStrength control\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eManganese (Mn)\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003ctd\u003e2.0\u003c\/td\u003e\n\u003ctd\u003eDeoxidizer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSilicon (Si)\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003ctd\u003e1.0\u003c\/td\u003e\n\u003ctd\u003eDeoxidizer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePhosphorus (P)\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003ctd\u003e0.045\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSulfur (S)\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003ctd\u003e0.015\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNitrogen (N)\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003ctd\u003e0.11\u003c\/td\u003e\n\u003ctd\u003eStrength enhancement\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIron (Fe)\u003c\/td\u003e\n\u003ctd\u003eBalance\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003ctd\u003eBase metal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"fk-section\"\u003e\n\u003ch2\u003eA4 vs A2 — Which Grade Do You Need?\u003c\/h2\u003e\n\u003cdiv class=\"fk-compare\"\u003e\n\u003cdiv class=\"fk-compare-card active\"\u003e\n\u003ch4\u003e⚓ A4 (SUS316) — This Product\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eContains 2–3% Molybdenum (Mo)\u003c\/li\u003e\n\u003cli\u003eSuperior chloride \u0026amp; saltwater resistance\u003c\/li\u003e\n\u003cli\u003eRecommended for marine \u0026amp; coastal use\u003c\/li\u003e\n\u003cli\u003eSuitable for C4\/C5 corrosion categories\u003c\/li\u003e\n\u003cli\u003eIdeal for food, pharma, chemical industries\u003c\/li\u003e\n\u003cli\u003eHigher cost, maximum protection\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"fk-compare-card muted\"\u003e\n\u003ch4\u003e🔩 A2 (SUS304) — Standard Grade\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eNo Molybdenum content\u003c\/li\u003e\n\u003cli\u003eGood general corrosion resistance\u003c\/li\u003e\n\u003cli\u003eSuitable for indoor \u0026amp; mild outdoor use\u003c\/li\u003e\n\u003cli\u003eC3\/C4 corrosion categories\u003c\/li\u003e\n\u003cli\u003eNot recommended for saltwater exposure\u003c\/li\u003e\n\u003cli\u003eLower cost, wide availability\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"fk-section\"\u003e\n\u003ch2\u003ePre-Drilling Recommendations\u003c\/h2\u003e\n\u003cp style=\"font-size:0.88rem;color:#555;margin-bottom:12px\"\u003ePre-drilling is mandatory for hardwoods and strongly recommended for softwoods. Pilot hole depth ≥ 2\/3 of screw length.\u003c\/p\u003e\n\u003cdiv class=\"fk-table-wrap\"\u003e\u003ctable class=\"fk-table\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eScrew Diameter\u003c\/th\u003e\n\u003cth\u003eSoftwood — Pilot Hole\u003c\/th\u003e\n\u003cth\u003eHardwood — Pilot Hole\u003c\/th\u003e\n\u003cth\u003eClearance Hole\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eM5\u003c\/td\u003e\n\u003ctd\u003e3.0 mm\u003c\/td\u003e\n\u003ctd\u003e3.5 mm\u003c\/td\u003e\n\u003ctd\u003e5.5 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eM6\u003c\/td\u003e\n\u003ctd\u003e3.5 mm\u003c\/td\u003e\n\u003ctd\u003e4.5 mm\u003c\/td\u003e\n\u003ctd\u003e6.5 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eM8\u003c\/td\u003e\n\u003ctd\u003e5.0 mm\u003c\/td\u003e\n\u003ctd\u003e6.0 mm\u003c\/td\u003e\n\u003ctd\u003e9.0 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eM10\u003c\/td\u003e\n\u003ctd\u003e6.0 mm\u003c\/td\u003e\n\u003ctd\u003e7.5 mm\u003c\/td\u003e\n\u003ctd\u003e11.0 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eM12\u003c\/td\u003e\n\u003ctd\u003e7.0 mm\u003c\/td\u003e\n\u003ctd\u003e9.0 mm\u003c\/td\u003e\n\u003ctd\u003e13.0 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eM16\u003c\/td\u003e\n\u003ctd\u003e10.0 mm\u003c\/td\u003e\n\u003ctd\u003e12.0 mm\u003c\/td\u003e\n\u003ctd\u003e17.0 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"fk-section\"\u003e\n\u003ch2\u003eRecommended Tightening Torque (Reference Values)\u003c\/h2\u003e\n\u003cdiv class=\"fk-table-wrap\"\u003e\u003ctable class=\"fk-table\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eScrew Size\u003c\/th\u003e\n\u003cth\u003eSoftwood (N·m)\u003c\/th\u003e\n\u003cth\u003eHardwood (N·m)\u003c\/th\u003e\n\u003cth\u003eNotes\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eM5 × 40\u003c\/td\u003e\n\u003ctd\u003e3 – 5\u003c\/td\u003e\n\u003ctd\u003e4 – 6\u003c\/td\u003e\n\u003ctd\u003eUse torque wrench\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eM6 × 50\u003c\/td\u003e\n\u003ctd\u003e6 – 9\u003c\/td\u003e\n\u003ctd\u003e8 – 12\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eM8 × 70\u003c\/td\u003e\n\u003ctd\u003e15 – 20\u003c\/td\u003e\n\u003ctd\u003e18 – 25\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eM10 × 100\u003c\/td\u003e\n\u003ctd\u003e30 – 40\u003c\/td\u003e\n\u003ctd\u003e35 – 50\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eM12 × 120\u003c\/td\u003e\n\u003ctd\u003e55 – 70\u003c\/td\u003e\n\u003ctd\u003e65 – 85\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eM16 × 150\u003c\/td\u003e\n\u003ctd\u003e120 – 150\u003c\/td\u003e\n\u003ctd\u003e140 – 180\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"fk-section\"\u003e\n\u003ch2\u003eTypical Applications\u003c\/h2\u003e\n\u003cdiv class=\"fk-apps\"\u003e\n\u003cdiv class=\"fk-app-card\"\u003e\n\u003cdiv class=\"fk-app-icon\"\u003e⛵\u003c\/div\u003e\n\u003cdiv\u003e\n\u003ch4\u003eMarine \u0026amp; Boat Building\u003c\/h4\u003e\n\u003cp\u003eDeck fittings, dock structures, boat building — where saltwater exposure demands maximum corrosion protection.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"fk-app-card\"\u003e\n\u003cdiv class=\"fk-app-icon\"\u003e🌊\u003c\/div\u003e\n\u003cdiv\u003e\n\u003ch4\u003eCoastal \u0026amp; Offshore Infrastructure\u003c\/h4\u003e\n\u003cp\u003eBoardwalks, piers, jetties, and coastal timber structures in salt-air environments.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"fk-app-card\"\u003e\n\u003cdiv class=\"fk-app-icon\"\u003e🏊\u003c\/div\u003e\n\u003cdiv\u003e\n\u003ch4\u003eSwimming Pools \u0026amp; Aquatic Facilities\u003c\/h4\u003e\n\u003cp\u003eChlorinated water environments where standard stainless steel is prone to pitting corrosion.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"fk-app-card\"\u003e\n\u003cdiv class=\"fk-app-icon\"\u003e🏭\u003c\/div\u003e\n\u003cdiv\u003e\n\u003ch4\u003eChemical \u0026amp; Process Industries\u003c\/h4\u003e\n\u003cp\u003eSecuring wooden structures in chemical plants, processing facilities, and aggressive industrial environments.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"fk-app-card\"\u003e\n\u003cdiv class=\"fk-app-icon\"\u003e🍽️\u003c\/div\u003e\n\u003cdiv\u003e\n\u003ch4\u003eFood \u0026amp; Beverage Processing\u003c\/h4\u003e\n\u003cp\u003eHygienic, non-contaminating fasteners compliant with food-grade facility requirements.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"fk-app-card\"\u003e\n\u003cdiv class=\"fk-app-icon\"\u003e❄️\u003c\/div\u003e\n\u003cdiv\u003e\n\u003ch4\u003eCold Storage \u0026amp; Refrigeration\u003c\/h4\u003e\n\u003cp\u003eExcellent performance at low temperatures down to −200°C for cold chain infrastructure.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"fk-section\"\u003e\n\u003ch2\u003ePackaging \u0026amp; Ordering Information\u003c\/h2\u003e\n\u003cdiv class=\"fk-two-col\"\u003e\n\u003cdiv class=\"fk-box\"\u003e\n\u003ch3\u003e📦 Standard Packaging\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eM5–M6: 100 \/ 200 \/ 500 \/ 1,000 pcs per box\u003c\/li\u003e\n\u003cli\u003eM8–M10: 50 \/ 100 \/ 200 pcs per box\u003c\/li\u003e\n\u003cli\u003eM12–M16: 10 \/ 25 \/ 50 pcs per box\u003c\/li\u003e\n\u003cli\u003eBulk \/ pallet quantities available on request\u003c\/li\u003e\n\u003cli\u003eCustom packaging with FULLERKREG branding available\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"fk-box\"\u003e\n\u003ch3\u003e📋 Ordering Notes\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eMOQ: 1 box (standard sizes)\u003c\/li\u003e\n\u003cli\u003eCustom lengths: MOQ 500 pcs, lead time 15–25 days\u003c\/li\u003e\n\u003cli\u003eEN 10204 3.1 material certificates available on request\u003c\/li\u003e\n\u003cli\u003eRoHS \u0026amp; REACH compliant\u003c\/li\u003e\n\u003cli\u003eCountry of Origin: China (full traceability)\u003c\/li\u003e\n\u003cli\u003eOEM \/ private label orders welcome\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"fk-section\"\u003e\n\u003ch2\u003eStandards Compliance \u0026amp; Certifications\u003c\/h2\u003e\n\u003cdiv class=\"fk-certs\"\u003e\n\u003cdiv class=\"fk-cert-card\"\u003e\n\u003cdiv class=\"fk-cert-icon\"\u003e📐\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eDIN 571\u003c\/strong\u003eHex Head Wood Screws dimensional standard\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"fk-cert-card\"\u003e\n\u003cdiv class=\"fk-cert-icon\"\u003e🔬\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eISO 3506-1\u003c\/strong\u003eMechanical properties of stainless steel fasteners\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"fk-cert-card\"\u003e\n\u003cdiv class=\"fk-cert-icon\"\u003e✅\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eISO 9001:2015\u003c\/strong\u003eQuality management system certified\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"fk-cert-card\"\u003e\n\u003cdiv class=\"fk-cert-icon\"\u003e🌿\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eRoHS Directive\u003c\/strong\u003eRestriction of hazardous substances compliant\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"fk-cert-card\"\u003e\n\u003cdiv class=\"fk-cert-icon\"\u003e📄\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eEN 10204 3.1\u003c\/strong\u003eMaterial test certificate available on request\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"fk-cert-card\"\u003e\n\u003cdiv class=\"fk-cert-icon\"\u003e🇪🇺\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eREACH Regulation\u003c\/strong\u003eFully compliant\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"fk-section\"\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdiv class=\"fk-faq\"\u003e\n\u003cdiv class=\"fk-faq-item\"\u003e\n\u003cdiv class=\"fk-faq-q\"\u003eQ1: Why choose A4 marine stainless steel over A2 for wood screws?\u003c\/div\u003e\n\u003cdiv class=\"fk-faq-a\"\u003eA4 (SUS316) contains 2–3% molybdenum, which significantly enhances resistance to pitting and crevice corrosion caused by chlorides (saltwater, de-icing salts, pool chemicals). A2 (SUS304) lacks molybdenum and can suffer pitting corrosion in marine or chloride-rich environments. For any coastal, marine, or chemically aggressive application, A4 is the correct choice.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"fk-faq-item\"\u003e\n\u003cdiv class=\"fk-faq-q\"\u003eQ2: What does A4-70 strength grade mean?\u003c\/div\u003e\n\u003cdiv class=\"fk-faq-a\"\u003eA4-70 designates the material (A4 = austenitic stainless steel with molybdenum) and the strength class (70 = minimum tensile strength of 700 MPa). This is defined by ISO 3506-1 and ensures the fastener meets both corrosion resistance and mechanical performance requirements.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"fk-faq-item\"\u003e\n\u003cdiv class=\"fk-faq-q\"\u003eQ3: Do DIN 571 A4 wood screws require pre-drilling?\u003c\/div\u003e\n\u003cdiv class=\"fk-faq-a\"\u003eYes. Pre-drilling is strongly recommended for all wood types and mandatory for hardwoods. This prevents wood splitting, reduces installation torque, and ensures proper thread engagement. Refer to our pre-drilling table for recommended pilot hole sizes.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"fk-faq-item\"\u003e\n\u003cdiv class=\"fk-faq-q\"\u003eQ4: Are material test certificates available for A4 screws?\u003c\/div\u003e\n\u003cdiv class=\"fk-faq-a\"\u003eYes. EN 10204 3.1 material test certificates confirming chemical composition and mechanical properties are available upon request for all orders. Please specify when placing your order.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"fk-faq-item\"\u003e\n\u003cdiv class=\"fk-faq-q\"\u003eQ5: Is A4 stainless steel suitable for swimming pool environments?\u003c\/div\u003e\n\u003cdiv class=\"fk-faq-a\"\u003eYes. A4 (SUS316) is specifically recommended for chlorinated water environments such as swimming pools, water treatment facilities, and aquatic centers. The molybdenum content provides the necessary resistance to chloride-induced pitting corrosion that would affect A2 grade fasteners.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"fk-faq-item\"\u003e\n\u003cdiv class=\"fk-faq-q\"\u003eQ6: Can FULLERKREG supply custom lengths for A4 DIN 571 screws?\u003c\/div\u003e\n\u003cdiv class=\"fk-faq-a\"\u003eYes. Custom lengths outside the standard range are available with a minimum order quantity of 500 pieces. Lead time is typically 15–25 business days. Contact our sales team with your specifications for a quotation.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"fk-faq-item\"\u003e\n\u003cdiv class=\"fk-faq-q\"\u003eQ7: What is the difference between SUS316 and SUS316L?\u003c\/div\u003e\n\u003cdiv class=\"fk-faq-a\"\u003eSUS316L (1.4404) is a low-carbon variant of SUS316 (1.4401), with carbon content ≤ 0.03% vs ≤ 0.07% for standard 316. The lower carbon in 316L reduces the risk of sensitization during welding. For fastener applications (non-welded), standard SUS316 \/ A4 provides equivalent corrosion resistance and is the standard grade for DIN 571 screws.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","products":[{"product_id":"128916","title":"M6-4x30 Hex Head Wood Screws (DIN 571) - Marine Stainless Steel (A4-70) 2400 Pcs per Carton","description":"","brand":"fullerkreg","offers":[{"title":"Default Title","offer_id":54146289959023,"sku":"128916","price":192.0,"currency_code":"USD","in_stock":true}]},{"product_id":"345218","title":"M6-4x30 Hex Head Wood Screws (DIN 571) - Marine Stainless Steel (A4-70) 2400 Pcs per Carton","description":"","brand":"fullerkreg","offers":[{"title":"Default Title","offer_id":54146291564655,"sku":"345218","price":187.2,"currency_code":"USD","in_stock":true}]},{"product_id":"128917","title":"M6-4x35 Hex Head Wood Screws (DIN 571) - Marine Stainless Steel (A4-70) 2100 Pcs per Carton","description":"","brand":"fullerkreg","offers":[{"title":"Default Title","offer_id":54146291597423,"sku":"128917","price":182.7,"currency_code":"USD","in_stock":true}]},{"product_id":"128918","title":"M6-4x40 Hex Head Wood Screws (DIN 571) - Marine Stainless Steel (A4-70) 1800 Pcs per Carton","description":"","brand":"fullerkreg","offers":[{"title":"Default Title","offer_id":54146292809839,"sku":"128918","price":174.6,"currency_code":"USD","in_stock":true}]},{"product_id":"345220","title":"M6-4x40 Hex Head Wood Screws (DIN 571) - Marine Stainless Steel (A4-70) 1800 Pcs per Carton","description":"","brand":"fullerkreg","offers":[{"title":"Default Title","offer_id":54146294382703,"sku":"345220","price":158.4,"currency_code":"USD","in_stock":true}]},{"product_id":"128919","title":"M6-4x45 Hex Head Wood Screws (DIN 571) - Marine Stainless Steel (A4-70) 1800 Pcs per Carton","description":"","brand":"fullerkreg","offers":[{"title":"Default Title","offer_id":54146294972527,"sku":"128919","price":185.4,"currency_code":"USD","in_stock":true}]},{"product_id":"345221","title":"M6-4x45 Hex Head Wood Screws (DIN 571) - Marine Stainless Steel (A4-70) 1800 Pcs per Carton","description":"","brand":"fullerkreg","offers":[{"title":"Default Title","offer_id":54146295005295,"sku":"345221","price":185.4,"currency_code":"USD","in_stock":false}]},{"product_id":"128920","title":"M6-4x50 Hex Head Wood Screws (DIN 571) - Marine Stainless Steel (A4-70) 1500 Pcs per Carton","description":"","brand":"fullerkreg","offers":[{"title":"Default Title","offer_id":54146295824495,"sku":"128920","price":174.0,"currency_code":"USD","in_stock":true}]},{"product_id":"345222","title":"M6-4x50 Hex Head Wood Screws (DIN 571) - Marine Stainless Steel (A4-70) 1500 Pcs per Carton","description":"","brand":"fullerkreg","offers":[{"title":"Default Title","offer_id":54146296741999,"sku":"345222","price":174.0,"currency_code":"USD","in_stock":false}]},{"product_id":"128922","title":"M6-4x60 Hex Head Wood Screws (DIN 571) - Marine Stainless Steel (A4-70) 900 Pcs per Carton","description":"","brand":"fullerkreg","offers":[{"title":"Default Title","offer_id":54146297462895,"sku":"128922","price":120.6,"currency_code":"USD","in_stock":true}]},{"product_id":"345224","title":"M6-4x60 Hex Head Wood Screws (DIN 571) - Marine Stainless Steel (A4-70) 1200 Pcs per Carton","description":"","brand":"fullerkreg","offers":[{"title":"Default Title","offer_id":54146298052719,"sku":"345224","price":146.4,"currency_code":"USD","in_stock":true}]},{"product_id":"128923","title":"M6-4x65 Hex Head Wood Screws (DIN 571) - Marine Stainless Steel (A4-70) 720 Pcs per Carton","description":"","brand":"fullerkreg","offers":[{"title":"Default Title","offer_id":54146298740847,"sku":"128923","price":102.96,"currency_code":"USD","in_stock":true}]},{"product_id":"345225","title":"M6-4x65 Hex Head Wood Screws (DIN 571) - Marine Stainless Steel (A4-70) 1200 Pcs per Carton","description":"","brand":"fullerkreg","offers":[{"title":"Default Title","offer_id":54146299953263,"sku":"345225","price":171.6,"currency_code":"USD","in_stock":false}]},{"product_id":"128924","title":"M6-4x70 Hex Head Wood Screws (DIN 571) - Marine Stainless Steel (A4-70) 900 Pcs per Carton","description":"","brand":"fullerkreg","offers":[{"title":"Default Title","offer_id":54146300575855,"sku":"128924","price":137.7,"currency_code":"USD","in_stock":true}]},{"product_id":"345226","title":"M6-4x70 Hex Head Wood Screws (DIN 571) - Marine Stainless Steel (A4-70) 1200 Pcs per Carton","description":"","brand":"fullerkreg","offers":[{"title":"Default Title","offer_id":54146301788271,"sku":"345226","price":183.6,"currency_code":"USD","in_stock":false}]},{"product_id":"311966","title":"M6-4x75 Hex Head Wood Screws (DIN 571) - Marine Stainless Steel (A4-70) 960 Pcs per Carton","description":"","brand":"fullerkreg","offers":[{"title":"Default Title","offer_id":54146302967919,"sku":"311966","price":156.48,"currency_code":"USD","in_stock":true}]},{"product_id":"345227","title":"M6-4x75 Hex Head Wood Screws (DIN 571) - Marine Stainless Steel (A4-70) 800 Pcs per Carton","description":"","brand":"fullerkreg","offers":[{"title":"Default Title","offer_id":54146304180335,"sku":"345227","price":130.4,"currency_code":"USD","in_stock":true}]},{"product_id":"311967","title":"M6-4x80 Hex Head Wood Screws (DIN 571) - Marine Stainless Steel (A4-70) 900 Pcs per Carton","description":"","brand":"fullerkreg","offers":[{"title":"Default Title","offer_id":54146304770159,"sku":"311967","price":152.1,"currency_code":"USD","in_stock":true}]},{"product_id":"345228","title":"M6-4x80 Hex Head Wood Screws (DIN 571) - Marine Stainless Steel (A4-70) 900 Pcs per Carton","description":"","brand":"fullerkreg","offers":[{"title":"Default Title","offer_id":54146305359983,"sku":"345228","price":152.1,"currency_code":"USD","in_stock":false}]},{"product_id":"311968","title":"M6-4x90 Hex Head Wood Screws (DIN 571) - 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