{"title":"Socket Flanged Button Screws (ISO 7380-2) - Marine Stainless Steel (A4)","description":"\u003ch2\u003eFULLERKREG ISO 7380-2 A4 Marine Stainless Steel Flanged Button Head Socket Cap Screws\u003c\/h2\u003e\n\u003cp\u003eFULLERKREG ISO 7380-2 A4 Marine Stainless Steel Flanged Button Head Socket Cap Screws are premium corrosion-resistant fasteners featuring a low-profile dome-shaped button head with an integrated flange and a hexagon socket drive. Manufactured from A4 (SUS316) austenitic stainless steel with a passivated natural finish, these screws combine the superior corrosion resistance of marine-grade stainless steel with the engineering advantages of an integrated flange. The addition of 2–3% molybdenum (Mo) in SUS316 provides dramatically better resistance to chlorides, saltwater, and acids compared to A2 (SUS304), making these the definitive choice for marine, coastal, chemical, and food processing environments where both corrosion resistance and pull-through resistance are required.\u003c\/p\u003e\n\n\u003ch2\u003eProduct Specifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard:\u003c\/strong\u003e ISO 7380-2 (2022)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e A4 Marine Stainless Steel (SUS316 \/ 316 SS)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStrength Grade:\u003c\/strong\u003e A4-070\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTensile Strength:\u003c\/strong\u003e Min. 700 MPa\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProof Load Stress (Rp0.2):\u003c\/strong\u003e Min. 450 MPa\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHardness:\u003c\/strong\u003e ≤95 HRB (max. 210 HV)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHead Type:\u003c\/strong\u003e Flanged button head (low-profile dome with integrated flange)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSurface Treatment:\u003c\/strong\u003e Passivation — natural silver finish (pickling \u0026amp; passivation)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Type:\u003c\/strong\u003e Metric coarse, full thread\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Tolerance:\u003c\/strong\u003e 6g\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrive Type:\u003c\/strong\u003e Hexagon socket (Allen key \/ hex key)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSizes Available:\u003c\/strong\u003e M4 – M16\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhy A4 (SUS316) vs A2 (SUS304)?\u003c\/h2\u003e\n\u003cp\u003eThe molybdenum content in A4 is the critical differentiator for corrosive environments:\u003c\/p\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eProperty\u003c\/th\u003e\n\u003cth\u003eA2 (SUS304)\u003c\/th\u003e\n\u003cth\u003eA4 (SUS316) — This Page\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eChromium (Cr)\u003c\/td\u003e\n\u003ctd\u003e18–20%\u003c\/td\u003e\n\u003ctd\u003e16–18%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNickel (Ni)\u003c\/td\u003e\n\u003ctd\u003e8–10.5%\u003c\/td\u003e\n\u003ctd\u003e10–14%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMolybdenum (Mo)\u003c\/td\u003e\n\u003ctd\u003eNone\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e2–3% (key advantage)\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eChloride resistance\u003c\/td\u003e\n\u003ctd\u003eGood\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eExcellent\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSaltwater \/ marine\u003c\/td\u003e\n\u003ctd\u003eLimited\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eSuperior — recommended grade\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAcid resistance\u003c\/td\u003e\n\u003ctd\u003eModerate\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eSuperior\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePitting corrosion resistance\u003c\/td\u003e\n\u003ctd\u003eStandard\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eSignificantly better\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrice point\u003c\/td\u003e\n\u003ctd\u003eStandard\u003c\/td\u003e\n\u003ctd\u003ePremium\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eISO 7380-2 vs ISO 7380-1 — Flanged vs Plain Button Head\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eProperty\u003c\/th\u003e\n\u003cth\u003eISO 7380-2 Flanged (This Page)\u003c\/th\u003e\n\u003cth\u003eISO 7380-1 Plain Button Head\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eHead profile\u003c\/td\u003e\n\u003ctd\u003eLow dome + integrated flange\u003c\/td\u003e\n\u003ctd\u003eLow dome only\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBearing surface area\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eSignificantly larger (flange)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eStandard button head\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWasher required?\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eNo — flange acts as integrated washer\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSometimes yes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePull-through resistance\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eSuperior\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eStandard\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLoad distribution\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eExcellent on thin\/soft materials\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eGood\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAssembly efficiency\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eFaster — one fewer component\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eStandard\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBest for\u003c\/td\u003e\n\u003ctd\u003eThin panels, soft materials, high pull-through risk\u003c\/td\u003e\n\u003ctd\u003eGeneral low-profile applications\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eMaterial — A4 Marine Stainless Steel (SUS316) Chemical Composition (%)\u003c\/h2\u003e\n\u003cp\u003eAll values are maximum unless a range is indicated.\u003c\/p\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eGrade\u003c\/th\u003e\n\u003cth\u003eC (max)\u003c\/th\u003e\n\u003cth\u003eSi (max)\u003c\/th\u003e\n\u003cth\u003eMn (max)\u003c\/th\u003e\n\u003cth\u003eP (max)\u003c\/th\u003e\n\u003cth\u003eS (max)\u003c\/th\u003e\n\u003cth\u003eCr\u003c\/th\u003e\n\u003cth\u003eNi\u003c\/th\u003e\n\u003cth\u003eMo\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eSUS316 (A4)\u003c\/td\u003e\n\u003ctd\u003e≤0.08\u003c\/td\u003e\n\u003ctd\u003e≤1.00\u003c\/td\u003e\n\u003ctd\u003e≤2.00\u003c\/td\u003e\n\u003ctd\u003e≤0.045\u003c\/td\u003e\n\u003ctd\u003e≤0.030\u003c\/td\u003e\n\u003ctd\u003e16.00–18.00\u003c\/td\u003e\n\u003ctd\u003e10.00–14.00\u003c\/td\u003e\n\u003ctd\u003e2.00–3.00\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eMechanical Properties — A4-070 (ISO 3506-1)\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eProperty\u003c\/th\u003e\n\u003cth\u003eRequirement\u003c\/th\u003e\n\u003cth\u003eUnit\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eTensile Strength (Rm)\u003c\/td\u003e\n\u003ctd\u003eMin. 700\u003c\/td\u003e\n\u003ctd\u003eMPa\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProof Load Stress (Rp0.2)\u003c\/td\u003e\n\u003ctd\u003eMin. 450\u003c\/td\u003e\n\u003ctd\u003eMPa\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHardness (max)\u003c\/td\u003e\n\u003ctd\u003e≤95 HRB \/ ≤210 HV\u003c\/td\u003e\n\u003ctd\u003eHRB \/ HV\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eElongation after fracture (A)\u003c\/td\u003e\n\u003ctd\u003eMin. 25\u003c\/td\u003e\n\u003ctd\u003e%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThread Tolerance Class\u003c\/td\u003e\n\u003ctd\u003e6g\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSurface Treatment\u003c\/td\u003e\n\u003ctd\u003ePassivation (natural finish)\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eIntegrated flange\u003c\/strong\u003e — built-in washer function eliminates need for separate washer, reducing part count and assembly time\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA4 Marine Stainless Steel (SUS316)\u003c\/strong\u003e — the highest corrosion resistance among standard stainless steel fastener grades\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMolybdenum-enhanced alloy\u003c\/strong\u003e — 2–3% Mo content provides outstanding pitting and crevice corrosion resistance in chloride environments\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePassivated natural finish\u003c\/strong\u003e — clean silver appearance with enhanced oxide layer for maximum rust resistance\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSuperior pull-through resistance\u003c\/strong\u003e — large flange bearing area prevents pull-through in thin sheet metal, plastic, and composite materials\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLow-profile button head\u003c\/strong\u003e — smooth dome design with clean aesthetic appearance\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNon-magnetic\u003c\/strong\u003e — suitable for applications sensitive to magnetic interference\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHygienic \u0026amp; food-safe\u003c\/strong\u003e — compliant for food processing, pharmaceutical, and medical equipment use\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRoHS \u0026amp; REACH compliant\u003c\/strong\u003e — no restricted hazardous substances\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eISO 7380-2 (2022) standard\u003c\/strong\u003e — latest revision compliance\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCorrosion Resistance Guide — A4 (SUS316)\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eEnvironment\u003c\/th\u003e\n\u003cth\u003eA4 (SUS316) Performance\u003c\/th\u003e\n\u003cth\u003eRecommendation\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eIndoor \/ dry environments\u003c\/td\u003e\n\u003ctd\u003eExcellent\u003c\/td\u003e\n\u003ctd\u003e✅ Ideal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutdoor \/ atmospheric exposure\u003c\/td\u003e\n\u003ctd\u003eExcellent\u003c\/td\u003e\n\u003ctd\u003e✅ Ideal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMarine \/ saltwater (direct)\u003c\/td\u003e\n\u003ctd\u003eVery good\u003c\/td\u003e\n\u003ctd\u003e✅ Recommended grade\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOffshore \/ coastal structures\u003c\/td\u003e\n\u003ctd\u003eVery good\u003c\/td\u003e\n\u003ctd\u003e✅ Recommended grade\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFood \u0026amp; pharmaceutical processing\u003c\/td\u003e\n\u003ctd\u003eExcellent\u003c\/td\u003e\n\u003ctd\u003e✅ Ideal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eChemical processing (mild acids)\u003c\/td\u003e\n\u003ctd\u003eVery good\u003c\/td\u003e\n\u003ctd\u003e✅ Suitable\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eChloride-rich environments\u003c\/td\u003e\n\u003ctd\u003eVery good\u003c\/td\u003e\n\u003ctd\u003e✅ Recommended grade\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSwimming pools \/ aquatic facilities\u003c\/td\u003e\n\u003ctd\u003eVery good\u003c\/td\u003e\n\u003ctd\u003e✅ Recommended grade\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStrong oxidizing acids\u003c\/td\u003e\n\u003ctd\u003eModerate\u003c\/td\u003e\n\u003ctd\u003e⚠️ Consult technical team\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eApplications\u003c\/h2\u003e\n\u003cp\u003eFULLERKREG ISO 7380-2 A4 marine stainless steel flanged button head socket cap screws are widely used in demanding corrosive environments:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eMarine vessels, boat fittings, and dock structures\u003c\/li\u003e\n\u003cli\u003eOffshore platforms and coastal architectural hardware\u003c\/li\u003e\n\u003cli\u003eDesalination and water treatment equipment\u003c\/li\u003e\n\u003cli\u003eChemical processing and petrochemical plants\u003c\/li\u003e\n\u003cli\u003eFood and beverage processing machinery (flange + corrosion resistance)\u003c\/li\u003e\n\u003cli\u003ePharmaceutical and medical device manufacturing\u003c\/li\u003e\n\u003cli\u003eSwimming pools, aquatic facilities, and spa equipment\u003c\/li\u003e\n\u003cli\u003eThin panel and composite material assemblies in marine environments\u003c\/li\u003e\n\u003cli\u003eAny application where A2 (SUS304) is insufficient due to chloride or acid exposure\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eDimensional Specifications — ISO 7380-2 (Unit: mm)\u003c\/h2\u003e\n\u003cp\u003eKey dimensions per ISO 7380-2 (2022). The flange diameter (dc) is the critical additional dimension vs. ISO 7380-1.\u003c\/p\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eThread (d)\u003c\/th\u003e\n\u003cth\u003ePitch (p)\u003c\/th\u003e\n\u003cth\u003eHead Dia. dk Max.\u003c\/th\u003e\n\u003cth\u003eHead Dia. dk Min.\u003c\/th\u003e\n\u003cth\u003eFlange Dia. dc Max.\u003c\/th\u003e\n\u003cth\u003eFlange Dia. dc Min.\u003c\/th\u003e\n\u003cth\u003eHead Height k Max.\u003c\/th\u003e\n\u003cth\u003eHead Height k Min.\u003c\/th\u003e\n\u003cth\u003eKey Size s\u003c\/th\u003e\n\u003cth\u003eKey Depth t Min.\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eM4\u003c\/td\u003e\n\u003ctd\u003e0.7\u003c\/td\u003e\n\u003ctd\u003e7.60\u003c\/td\u003e\n\u003ctd\u003e7.36\u003c\/td\u003e\n\u003ctd\u003e9.40\u003c\/td\u003e\n\u003ctd\u003e9.00\u003c\/td\u003e\n\u003ctd\u003e2.20\u003c\/td\u003e\n\u003ctd\u003e1.80\u003c\/td\u003e\n\u003ctd\u003e2.5\u003c\/td\u003e\n\u003ctd\u003e1.05\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eM5\u003c\/td\u003e\n\u003ctd\u003e0.8\u003c\/td\u003e\n\u003ctd\u003e9.50\u003c\/td\u003e\n\u003ctd\u003e9.22\u003c\/td\u003e\n\u003ctd\u003e11.80\u003c\/td\u003e\n\u003ctd\u003e11.40\u003c\/td\u003e\n\u003ctd\u003e2.75\u003c\/td\u003e\n\u003ctd\u003e2.25\u003c\/td\u003e\n\u003ctd\u003e3.0\u003c\/td\u003e\n\u003ctd\u003e1.35\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\u003e10.50\u003c\/td\u003e\n\u003ctd\u003e10.22\u003c\/td\u003e\n\u003ctd\u003e13.60\u003c\/td\u003e\n\u003ctd\u003e13.20\u003c\/td\u003e\n\u003ctd\u003e3.30\u003c\/td\u003e\n\u003ctd\u003e2.70\u003c\/td\u003e\n\u003ctd\u003e4.0\u003c\/td\u003e\n\u003ctd\u003e1.60\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\u003e14.00\u003c\/td\u003e\n\u003ctd\u003e13.57\u003c\/td\u003e\n\u003ctd\u003e17.90\u003c\/td\u003e\n\u003ctd\u003e17.50\u003c\/td\u003e\n\u003ctd\u003e4.40\u003c\/td\u003e\n\u003ctd\u003e3.60\u003c\/td\u003e\n\u003ctd\u003e5.0\u003c\/td\u003e\n\u003ctd\u003e2.20\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\u003e17.50\u003c\/td\u003e\n\u003ctd\u003e17.05\u003c\/td\u003e\n\u003ctd\u003e22.30\u003c\/td\u003e\n\u003ctd\u003e21.80\u003c\/td\u003e\n\u003ctd\u003e5.50\u003c\/td\u003e\n\u003ctd\u003e4.50\u003c\/td\u003e\n\u003ctd\u003e6.0\u003c\/td\u003e\n\u003ctd\u003e2.75\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\u003e21.00\u003c\/td\u003e\n\u003ctd\u003e20.48\u003c\/td\u003e\n\u003ctd\u003e26.70\u003c\/td\u003e\n\u003ctd\u003e26.20\u003c\/td\u003e\n\u003ctd\u003e6.60\u003c\/td\u003e\n\u003ctd\u003e5.40\u003c\/td\u003e\n\u003ctd\u003e8.0\u003c\/td\u003e\n\u003ctd\u003e3.30\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\u003e28.00\u003c\/td\u003e\n\u003ctd\u003e27.48\u003c\/td\u003e\n\u003ctd\u003e35.70\u003c\/td\u003e\n\u003ctd\u003e35.20\u003c\/td\u003e\n\u003ctd\u003e8.80\u003c\/td\u003e\n\u003ctd\u003e7.20\u003c\/td\u003e\n\u003ctd\u003e10.0\u003c\/td\u003e\n\u003ctd\u003e4.40\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What is the difference between ISO 7380-1 and ISO 7380-2?\u003c\/strong\u003e\u003cbr\u003e\nISO 7380-1 is the plain button head socket cap screw with no flange. ISO 7380-2 adds an integrated flange under the button head, which significantly increases the bearing surface area, acts as a built-in washer, and provides superior pull-through resistance.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Why choose A4 over A2 for flanged button head screws?\u003c\/strong\u003e\u003cbr\u003e\nIf your application involves saltwater, marine environments, chloride exposure, or aggressive chemicals, A4 (SUS316) is the correct choice. The 2–3% molybdenum content in A4 provides significantly better pitting corrosion resistance than A2 (SUS304).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What does A4-070 mean?\u003c\/strong\u003e\u003cbr\u003e\nA4-070 is the property class designation per ISO 3506-1 for stainless steel fasteners. “A4” refers to the austenitic stainless steel grade (SUS316), and “070” indicates a minimum tensile strength of 700 MPa. This is equivalent to the commonly used designation A4-70.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Do I still need a washer with ISO 7380-2 flanged button head screws?\u003c\/strong\u003e\u003cbr\u003e\nIn most applications, no. The integrated flange provides sufficient bearing area to replace a standard flat washer, reducing part count and assembly time.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Can I get material certificates and test reports?\u003c\/strong\u003e\u003cbr\u003e\nYes. PPAP reports, material certificates (including Mo content verification), hardness test reports, and tensile test reports are available upon request for all FULLERKREG products.\u003c\/p\u003e\n\n\u003ch2\u003ePackaging \u0026amp; Availability\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eStandard sizes M4 – M16 available in stock\u003c\/li\u003e\n\u003cli\u003eBulk carton packaging; small box and custom packaging available\u003c\/li\u003e\n\u003cli\u003eMaterial certificates (including Mo content verification) available on request\u003c\/li\u003e\n\u003cli\u003ePPAP report available on request\u003c\/li\u003e\n\u003cli\u003eCustom lengths accepted for large orders\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eDownload Specification\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0054\/6317\/9375\/files\/ISO-7380-2-2022.pdf?v=1779083841\" title=\"ISO 7380-2 2022 Flanged Button Head Socket Cap Screw Dimensional Specification PDF\"\u003eISO 7380-2 (2022) — Full Dimensional Specification (PDF)\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eQuality Assurance\u003c\/h2\u003e\n\u003cp\u003eAll FULLERKREG ISO 7380-2 A4 marine stainless steel flanged button head socket cap screws are manufactured under strict quality control procedures including:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eHardness test (≤95 HRB)\u003c\/li\u003e\n\u003cli\u003eTensile strength test (min. 700 MPa)\u003c\/li\u003e\n\u003cli\u003eDimensional inspection per ISO 7380-2 (2022), including flange diameter verification\u003c\/li\u003e\n\u003cli\u003eChemical composition verification (SUS316, Mo content confirmed)\u003c\/li\u003e\n\u003cli\u003eSalt spray corrosion test\u003c\/li\u003e\n\u003cli\u003ePPAP documentation available upon request\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eFor wholesale pricing, bulk orders, material certificates, or technical inquiries, please \u003ca href=\"\/pages\/contact-us\"\u003econtact our sales team\u003c\/a\u003e.\u003c\/p\u003e","products":[],"url":"https:\/\/www.fullerkr.com\/collections\/socket-flanged-button-screws-iso-7380-2-marine-stainless-steel-a4.oembed","provider":"Fullerkreg Fasteners","version":"1.0","type":"link"}