{"title":"DIN 557 Metric Square Nut - Class 4.8 - Zinc Plated","description":"\u003ch1\u003eDIN 557 Metric Square Nuts — Class 4.8 · Zinc Plated (Cr3)\u003c\/h1\u003e\n\n\u003cp\u003eFULLERKREG DIN 557 metric square nuts in Class 4.8 are manufactured from Q195 low carbon steel and finished with a trivalent chromium zinc plating (Zinc Cr3) for reliable corrosion protection in general-purpose indoor and light outdoor applications. The chamfered top face ensures clean seating and easy wrench engagement. Cost-effective, RoHS-compliant, and available in bulk wholesale quantities from M5 to M16.\u003c\/p\u003e\n\n\u003ch2\u003eProduct Specifications\u003c\/h2\u003e\n\u003ctable border=\"1\" cellpadding=\"6\" cellspacing=\"0\" style=\"border-collapse:collapse;width:100%;text-align:center;\"\u003e\n  \u003cthead style=\"background-color:#f2f2f2;\"\u003e\n    \u003ctr\u003e\n      \u003cth\u003eProperty\u003c\/th\u003e\n      \u003cth\u003eDetails\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eStandard\u003c\/td\u003e\n\u003ctd\u003eDIN 557\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eChamfered Square Nut\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eProperty Class\u003c\/td\u003e\n\u003ctd\u003e4.8\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eQ195 Low Carbon Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eSurface Treatment\u003c\/td\u003e\n\u003ctd\u003eZinc Plated — Trivalent Chromium (Cr3 \/ RoHS Compliant)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eZinc Coating Thickness\u003c\/td\u003e\n\u003ctd\u003e5–12 μm (typical)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eThread Type\u003c\/td\u003e\n\u003ctd\u003eMetric Coarse Thread (ISO 68-1)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eSize Range\u003c\/td\u003e\n\u003ctd\u003eM5 – M16\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eRoHS Compliant\u003c\/td\u003e\n\u003ctd\u003eYes — Cr3 (Trivalent Chromium), Hexavalent Chromium (Cr6) Free\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eSalt Spray Resistance\u003c\/td\u003e\n\u003ctd\u003e≥72 hours (per ISO 9227, white rust)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eDimensional Data (DIN 557 · Unit: mm)\u003c\/h2\u003e\n\u003ctable border=\"1\" cellpadding=\"6\" cellspacing=\"0\" style=\"border-collapse:collapse;width:100%;text-align:center;\"\u003e\n  \u003cthead style=\"background-color:#f2f2f2;\"\u003e\n    \u003ctr\u003e\n      \u003cth rowspan=\"2\"\u003eThread Size\u003cbr\u003ed\u003c\/th\u003e\n      \u003cth rowspan=\"2\"\u003ePitch\u003cbr\u003e(mm)\u003c\/th\u003e\n      \u003cth colspan=\"2\"\u003eNut Height m (mm)\u003c\/th\u003e\n      \u003cth rowspan=\"2\"\u003eMin Wrenching\u003cbr\u003emw (mm)\u003c\/th\u003e\n      \u003cth colspan=\"2\"\u003eAcross Flats s (mm)\u003c\/th\u003e\n      \u003cth colspan=\"2\"\u003eAcross Corners e (mm)\u003c\/th\u003e\n      \u003cth rowspan=\"2\"\u003eBearing Dia.\u003cbr\u003edw min (mm)\u003c\/th\u003e\n      \u003cth rowspan=\"2\"\u003eEst. Unit Weight\u003cbr\u003e(g\/pc)\u003c\/th\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003cth\u003emax\u003c\/th\u003e\n      \u003cth\u003emin\u003c\/th\u003e\n      \u003cth\u003emax\u003c\/th\u003e\n      \u003cth\u003emin\u003c\/th\u003e\n      \u003cth\u003emax\u003c\/th\u003e\n      \u003cth\u003emin\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM5\u003c\/td\u003e\n\u003ctd\u003e0.8\u003c\/td\u003e\n\u003ctd\u003e4.00\u003c\/td\u003e\n\u003ctd\u003e3.52\u003c\/td\u003e\n\u003ctd\u003e2.50\u003c\/td\u003e\n\u003ctd\u003e8.00\u003c\/td\u003e\n\u003ctd\u003e7.64\u003c\/td\u003e\n\u003ctd\u003e11.30\u003c\/td\u003e\n\u003ctd\u003e9.93\u003c\/td\u003e\n\u003ctd\u003e6.70\u003c\/td\u003e\n\u003ctd\u003e~1.4\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM6\u003c\/td\u003e\n\u003ctd\u003e1.0\u003c\/td\u003e\n\u003ctd\u003e5.00\u003c\/td\u003e\n\u003ctd\u003e4.52\u003c\/td\u003e\n\u003ctd\u003e3.20\u003c\/td\u003e\n\u003ctd\u003e10.00\u003c\/td\u003e\n\u003ctd\u003e9.64\u003c\/td\u003e\n\u003ctd\u003e14.10\u003c\/td\u003e\n\u003ctd\u003e12.53\u003c\/td\u003e\n\u003ctd\u003e8.70\u003c\/td\u003e\n\u003ctd\u003e~2.7\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM8\u003c\/td\u003e\n\u003ctd\u003e1.25\u003c\/td\u003e\n\u003ctd\u003e6.50\u003c\/td\u003e\n\u003ctd\u003e5.92\u003c\/td\u003e\n\u003ctd\u003e4.10\u003c\/td\u003e\n\u003ctd\u003e13.00\u003c\/td\u003e\n\u003ctd\u003e12.57\u003c\/td\u003e\n\u003ctd\u003e18.40\u003c\/td\u003e\n\u003ctd\u003e16.34\u003c\/td\u003e\n\u003ctd\u003e11.50\u003c\/td\u003e\n\u003ctd\u003e~5.8\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM10\u003c\/td\u003e\n\u003ctd\u003e1.5\u003c\/td\u003e\n\u003ctd\u003e8.00\u003c\/td\u003e\n\u003ctd\u003e7.42\u003c\/td\u003e\n\u003ctd\u003e5.20\u003c\/td\u003e\n\u003ctd\u003e17.00\u003c\/td\u003e\n\u003ctd\u003e16.57\u003c\/td\u003e\n\u003ctd\u003e24.00\u003c\/td\u003e\n\u003ctd\u003e21.54\u003c\/td\u003e\n\u003ctd\u003e14.50\u003c\/td\u003e\n\u003ctd\u003e~11.2\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM12\u003c\/td\u003e\n\u003ctd\u003e1.75\u003c\/td\u003e\n\u003ctd\u003e10.00\u003c\/td\u003e\n\u003ctd\u003e9.42\u003c\/td\u003e\n\u003ctd\u003e6.60\u003c\/td\u003e\n\u003ctd\u003e19.00\u003c\/td\u003e\n\u003ctd\u003e18.57\u003c\/td\u003e\n\u003ctd\u003e26.90\u003c\/td\u003e\n\u003ctd\u003e24.02\u003c\/td\u003e\n\u003ctd\u003e16.50\u003c\/td\u003e\n\u003ctd\u003e~16.6\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM16\u003c\/td\u003e\n\u003ctd\u003e2.0\u003c\/td\u003e\n\u003ctd\u003e13.00\u003c\/td\u003e\n\u003ctd\u003e12.30\u003c\/td\u003e\n\u003ctd\u003e8.60\u003c\/td\u003e\n\u003ctd\u003e24.00\u003c\/td\u003e\n\u003ctd\u003e23.16\u003c\/td\u003e\n\u003ctd\u003e33.90\u003c\/td\u003e\n\u003ctd\u003e30.11\u003c\/td\u003e\n\u003ctd\u003e22.00\u003c\/td\u003e\n\u003ctd\u003e~37.2\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp style=\"font-size:0.85em;color:#666;\"\u003e* Dimensions per DIN 557. Unit weight values are approximate references for Q195 carbon steel density (7.85 g\/cm³), excluding zinc coating. Actual weight may vary slightly by batch. Data is strictly informative.\u003c\/p\u003e\n\n\u003ch2\u003eSelection Guide\u003c\/h2\u003e\n\u003ctable border=\"1\" cellpadding=\"6\" cellspacing=\"0\" style=\"border-collapse:collapse;width:100%;text-align:center;\"\u003e\n  \u003cthead style=\"background-color:#f2f2f2;\"\u003e\n    \u003ctr\u003e\n      \u003cth\u003eApplication Scenario\u003c\/th\u003e\n      \u003cth\u003eRecommended Size\u003c\/th\u003e\n      \u003cth\u003eReason\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eGeneral mechanical assemblies (indoor)\u003c\/td\u003e\n\u003ctd\u003eM5 – M16\u003c\/td\u003e\n\u003ctd\u003eCost-effective Class 4.8 strength for standard loads\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eFurniture \u0026amp; woodworking fixtures\u003c\/td\u003e\n\u003ctd\u003eM5 – M10\u003c\/td\u003e\n\u003ctd\u003eSquare profile prevents rotation in pre-cut slots\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eLight structural steel fabrication\u003c\/td\u003e\n\u003ctd\u003eM8 – M16\u003c\/td\u003e\n\u003ctd\u003eWide bearing surface distributes clamping load\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eT-slot \/ aluminum profile framing\u003c\/td\u003e\n\u003ctd\u003eM5 – M12\u003c\/td\u003e\n\u003ctd\u003eSquare body locks into extrusion channel without spinning\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eElectrical enclosures \u0026amp; panel boards\u003c\/td\u003e\n\u003ctd\u003eM5 – M8\u003c\/td\u003e\n\u003ctd\u003eCompact size, RoHS-compliant Cr3 zinc finish\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eAgricultural \u0026amp; construction equipment\u003c\/td\u003e\n\u003ctd\u003eM10 – M16\u003c\/td\u003e\n\u003ctd\u003eHigh clamping force, economical carbon steel cost\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eStandard \u0026amp; Compliance\u003c\/h2\u003e\n\u003cp\u003eFULLERKREG DIN 557 Class 4.8 zinc-plated square nuts comply with the following standards:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDIN 557\u003c\/strong\u003e — Chamfered Square Nuts; defines geometry, tolerances, and thread engagement requirements\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eISO 4034\u003c\/strong\u003e — Hexagon nuts, style 1 (cross-reference for property class definitions)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eISO 898-2\u003c\/strong\u003e — Mechanical properties of nuts — Property Class 4.8\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eISO 68-1\u003c\/strong\u003e — Metric screw thread profile\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eISO 9227\u003c\/strong\u003e — Salt spray corrosion test standard\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRoHS Directive 2011\/65\/EU\u003c\/strong\u003e — Trivalent Cr3 zinc plating; Hexavalent Chromium (Cr6) free\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eREACH Regulation\u003c\/strong\u003e — No substances of very high concern (SVHC) above threshold\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eMaterial \u0026amp; Surface\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Q195 Low Carbon Steel — Carbon content ≤0.12%, excellent cold formability and weldability\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eProperty Class:\u003c\/strong\u003e 4.8 — Proof load stress 380 MPa; Tensile strength ≥ 420 MPa\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSurface:\u003c\/strong\u003e Zinc Plated with Trivalent Chromium Passivation (Cr3) — bright silver finish\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCoating Thickness:\u003c\/strong\u003e 5–12 μm zinc layer (electroplated)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCorrosion Resistance:\u003c\/strong\u003e ≥72 hours white rust resistance per ISO 9227 salt spray test\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eEnvironmental:\u003c\/strong\u003e Cr3 passivation is RoHS-compliant and free of hexavalent chromium (Cr6), meeting EU and international environmental regulations\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAppearance:\u003c\/strong\u003e Bright silver-white metallic finish; uniform coating across all surfaces including thread flanks\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eProduct Gallery\u003c\/h2\u003e\n\u003ctable border=\"0\" cellpadding=\"8\" cellspacing=\"0\" style=\"width:100%;text-align:center;\"\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"width:25%;vertical-align:top;border:1px solid #e0e0e0;padding:12px;\"\u003e[Product Image 1]\u003c\/td\u003e\n      \u003ctd style=\"width:25%;vertical-align:top;border:1px solid #e0e0e0;padding:12px;\"\u003e[Product Image 2]\u003c\/td\u003e\n      \u003ctd style=\"width:25%;vertical-align:top;border:1px solid #e0e0e0;padding:12px;\"\u003e[Product Image 3]\u003c\/td\u003e\n      \u003ctd style=\"width:25%;vertical-align:top;border:1px solid #e0e0e0;padding:12px;\"\u003e[Product Image 4]\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eWhy FULLERKREG\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e🏭 \u003cstrong\u003eDirect Manufacturer\u003c\/strong\u003e — Factory-direct pricing with full traceability from raw material to finished fastener\u003c\/li\u003e\n  \u003cli\u003e📐 \u003cstrong\u003ePrecision Conformance\u003c\/strong\u003e — Strict dimensional inspection per DIN 557; thread gauged 100% Go\/No-Go\u003c\/li\u003e\n  \u003cli\u003e🔬 \u003cstrong\u003eMaterial \u0026amp; Coating Certification\u003c\/strong\u003e — Mill test reports (MTR), RoHS \u0026amp; salt spray test certificates available on request\u003c\/li\u003e\n  \u003cli\u003e📦 \u003cstrong\u003eFlexible MOQ\u003c\/strong\u003e — Bulk bag, box, or pallet quantities; custom packaging and labeling available\u003c\/li\u003e\n  \u003cli\u003e🌍 \u003cstrong\u003eGlobal Shipping\u003c\/strong\u003e — Export experience to 50+ countries; sea, air, and express logistics supported\u003c\/li\u003e\n  \u003cli\u003e⚡ \u003cstrong\u003eFast Lead Time\u003c\/strong\u003e — In-stock standard sizes ship within 3–5 business days\u003c\/li\u003e\n  \u003cli\u003e🤝 \u003cstrong\u003eB2B Wholesale\u003c\/strong\u003e — Volume pricing tiers, OEM labeling, and long-term supply agreements available\u003c\/li\u003e\n\u003c\/ul\u003e","products":[{"product_id":"din-557-4-m5","title":"M5-0.8 DIN 557 Metric Square Nut - Class 4.8 - Zinc-20000 Pcs per Carton","description":"\u003cp\u003e22\u003c\/p\u003e","brand":"Fullerkreg Fasteners","offers":[{"title":"Default Title","offer_id":44514764259439,"sku":"DIN 557-4-M5","price":100.0,"currency_code":"USD","in_stock":true}]},{"product_id":"din-557-4-m6","title":"M6-1.0 DIN 557 Metric Square Nut - Class 4.8 - Zinc-10000 Pcs per Carton","description":"\u003cp\u003e23\u003c\/p\u003e","brand":"Fullerkreg Fasteners","offers":[{"title":"Default Title","offer_id":44514764292207,"sku":"DIN 557-4-M6","price":70.0,"currency_code":"USD","in_stock":true}]},{"product_id":"din-557-4-m8","title":"M8-1.25 DIN 557 Metric Square Nut - Class 4.8 - Zinc-4000 Pcs per Carton","description":"\u003cp\u003e24\u003c\/p\u003e","brand":"Fullerkreg Fasteners","offers":[{"title":"Default Title","offer_id":44514764324975,"sku":"DIN 557-4-M8","price":44.0,"currency_code":"USD","in_stock":true}]},{"product_id":"din-557-4-m10","title":"M10-1.5 DIN 557 Metric Square Nut - Class 4.8 - Zinc-2000 Pcs per Carton","description":"\u003cp\u003e25\u003c\/p\u003e","brand":"Fullerkreg Fasteners","offers":[{"title":"Default Title","offer_id":44514764357743,"sku":"DIN 557-4-M10","price":52.0,"currency_code":"USD","in_stock":true}]},{"product_id":"din-557-4-m12","title":"M12-1.75 DIN 557 Metric Square Nut - Class 4.8 - Zinc-1400 Pcs per Carton","description":"\u003cp\u003e26\u003c\/p\u003e","brand":"Fullerkreg Fasteners","offers":[{"title":"Default Title","offer_id":44514764390511,"sku":"DIN 557-4-M12","price":56.0,"currency_code":"USD","in_stock":true}]},{"product_id":"din-557-4-m16","title":"M16-2.0 DIN 557 Metric Square Nut - Class 4.8 - Zinc-600 Pcs per Carton","description":"\u003cp\u003e27\u003c\/p\u003e","brand":"Fullerkreg Fasteners","offers":[{"title":"Default Title","offer_id":44514764423279,"sku":"DIN 557-4-M16","price":44.4,"currency_code":"USD","in_stock":true}]}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0054\/6317\/9375\/collections\/DIN_557_1052a40e-10b8-4321-ab96-efbb8a681788.webp?v=1770529309","url":"https:\/\/www.fullerkr.com\/collections\/din557-4zn.oembed","provider":"Fullerkreg Fasteners","version":"1.0","type":"link"}