{"title":"ISO 7379 Socket Head Shoulder Screw A2 Stainless","description":"\u003ch2\u003eFULLERKREG ISO 7379 A2 Stainless Steel Socket Head Shoulder Screws\u003c\/h2\u003e\n\u003cp\u003eFULLERKREG ISO 7379 A2 Stainless Steel Socket Head Shoulder Screws are precision corrosion-resistant fasteners with a unique three-part geometry: a cylindrical socket head, a precision-ground smooth shoulder (body), and a reduced-diameter threaded end. Manufactured from A2 (SUS304) austenitic stainless steel with a passivated natural finish, the shoulder is precision-ground to h6 tolerance, providing an accurate bearing surface for pivots, guides, linkages, and rolling element bearings. The combination of precision h6 shoulder geometry and A2 stainless steel corrosion resistance makes these screws the preferred choice for food processing, medical, outdoor, and corrosion-sensitive precision pivot applications.\u003c\/p\u003e\n\n\u003ch2\u003eProduct Specifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard:\u003c\/strong\u003e ISO 7379\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e A2 Stainless Steel (SUS304 \/ 18-8)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStrength Grade:\u003c\/strong\u003e A2-70\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\u003eShoulder Diameter Tolerance:\u003c\/strong\u003e h6 (precision ground)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread:\u003c\/strong\u003e Metric coarse, reduced diameter (smaller than shoulder)\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\u003eSurface Treatment:\u003c\/strong\u003e Passivation — natural silver finish (pickling \u0026amp; passivation)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShoulder Sizes Available:\u003c\/strong\u003e φ5 – φ20 mm\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eUnderstanding Shoulder Screw Geometry\u003c\/h2\u003e\n\u003cp\u003eA shoulder screw has three distinct sections, each with a specific function:\u003c\/p\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eSection\u003c\/th\u003e\n\u003cth\u003eDescription\u003c\/th\u003e\n\u003cth\u003eFunction\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eHead\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCylindrical socket head (knurled)\u003c\/td\u003e\n\u003ctd\u003eDrive and clamping — seats against mating surface\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eShoulder (Body)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePrecision-ground smooth cylinder, h6 tolerance\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eThe functional element — pivot axis, guide pin, bearing race\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eThread\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eReduced diameter, shorter than shoulder\u003c\/td\u003e\n\u003ctd\u003eFastening into tapped hole — pulls head down to clamp\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cstrong\u003eKey principle:\u003c\/strong\u003e The thread diameter is always smaller than the shoulder diameter. The shoulder bears the load; the thread only provides clamping force. The component mounted on the shoulder (bearing, bushing, link) rotates or slides on the shoulder, not on the thread.\u003c\/p\u003e\n\n\u003ch2\u003eA2 Stainless vs Grade 12.9 Alloy Steel — Selection Guide\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eProperty\u003c\/th\u003e\n\u003cth\u003eA2 Stainless (This Page)\u003c\/th\u003e\n\u003cth\u003eGrade 12.9 Alloy Steel (SCM440)\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eSUS304 (18-8)\u003c\/td\u003e\n\u003ctd\u003eSCM440 (42CrMo4)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTensile strength\u003c\/td\u003e\n\u003ctd\u003eMin. 700 MPa\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eMin. 1,220 MPa\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCorrosion resistance\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eExcellent\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eModerate (black oxide)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSurface\u003c\/td\u003e\n\u003ctd\u003ePassivated (natural silver)\u003c\/td\u003e\n\u003ctd\u003eBlack oxide\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNon-magnetic\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eYes (generally)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFood \/ medical safe\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eYes\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBest for\u003c\/td\u003e\n\u003ctd\u003eFood, medical, outdoor, corrosion-sensitive pivots\u003c\/td\u003e\n\u003ctd\u003eHigh-load dynamic, robotics, automotive\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eShoulder Diameter to Thread Size Relationship (ISO 7379)\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eShoulder Dia. (d1)\u003c\/th\u003e\n\u003cth\u003eThread Size (d2)\u003c\/th\u003e\n\u003cth\u003eHead Dia. (d3)\u003c\/th\u003e\n\u003cth\u003eHead Height (l2)\u003c\/th\u003e\n\u003cth\u003eKey Size (s)\u003c\/th\u003e\n\u003cth\u003eKey Depth (t)\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eφ 5 mm\u003c\/td\u003e\n\u003ctd\u003eM4\u003c\/td\u003e\n\u003ctd\u003e8.0\u003c\/td\u003e\n\u003ctd\u003e4.5\u003c\/td\u003e\n\u003ctd\u003e3\u003c\/td\u003e\n\u003ctd\u003e2.0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eφ 6 mm\u003c\/td\u003e\n\u003ctd\u003eM5\u003c\/td\u003e\n\u003ctd\u003e10.0\u003c\/td\u003e\n\u003ctd\u003e5.5\u003c\/td\u003e\n\u003ctd\u003e4\u003c\/td\u003e\n\u003ctd\u003e2.5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eφ 8 mm\u003c\/td\u003e\n\u003ctd\u003eM6\u003c\/td\u003e\n\u003ctd\u003e13.0\u003c\/td\u003e\n\u003ctd\u003e7.0\u003c\/td\u003e\n\u003ctd\u003e5\u003c\/td\u003e\n\u003ctd\u003e3.0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eφ 10 mm\u003c\/td\u003e\n\u003ctd\u003eM8\u003c\/td\u003e\n\u003ctd\u003e16.0\u003c\/td\u003e\n\u003ctd\u003e8.5\u003c\/td\u003e\n\u003ctd\u003e6\u003c\/td\u003e\n\u003ctd\u003e4.0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eφ 12 mm\u003c\/td\u003e\n\u003ctd\u003eM10\u003c\/td\u003e\n\u003ctd\u003e18.0\u003c\/td\u003e\n\u003ctd\u003e10.0\u003c\/td\u003e\n\u003ctd\u003e8\u003c\/td\u003e\n\u003ctd\u003e4.5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eφ 16 mm\u003c\/td\u003e\n\u003ctd\u003eM12\u003c\/td\u003e\n\u003ctd\u003e24.0\u003c\/td\u003e\n\u003ctd\u003e13.0\u003c\/td\u003e\n\u003ctd\u003e10\u003c\/td\u003e\n\u003ctd\u003e5.5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eφ 20 mm\u003c\/td\u003e\n\u003ctd\u003eM16\u003c\/td\u003e\n\u003ctd\u003e30.0\u003c\/td\u003e\n\u003ctd\u003e16.0\u003c\/td\u003e\n\u003ctd\u003e14\u003c\/td\u003e\n\u003ctd\u003e7.0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eShoulder Tolerance — h6 Precision Ground\u003c\/h2\u003e\n\u003cp\u003eThe shoulder diameter is precision-ground to \u003cstrong\u003eh6 tolerance\u003c\/strong\u003e per ISO 286-1. This is a close-clearance fit tolerance suitable for rotating and sliding applications:\u003c\/p\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eShoulder Dia.\u003c\/th\u003e\n\u003cth\u003eh6 Upper Deviation\u003c\/th\u003e\n\u003cth\u003eh6 Lower Deviation\u003c\/th\u003e\n\u003cth\u003eh6 Tolerance Band\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eφ 5 mm\u003c\/td\u003e\n\u003ctd\u003e0\u003c\/td\u003e\n\u003ctd\u003e−8 μm\u003c\/td\u003e\n\u003ctd\u003e8 μm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eφ 6 mm\u003c\/td\u003e\n\u003ctd\u003e0\u003c\/td\u003e\n\u003ctd\u003e−9 μm\u003c\/td\u003e\n\u003ctd\u003e9 μm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eφ 8 mm\u003c\/td\u003e\n\u003ctd\u003e0\u003c\/td\u003e\n\u003ctd\u003e−15 μm\u003c\/td\u003e\n\u003ctd\u003e15 μm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eφ 10 mm\u003c\/td\u003e\n\u003ctd\u003e0\u003c\/td\u003e\n\u003ctd\u003e−15 μm\u003c\/td\u003e\n\u003ctd\u003e15 μm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eφ 12 mm\u003c\/td\u003e\n\u003ctd\u003e0\u003c\/td\u003e\n\u003ctd\u003e−18 μm\u003c\/td\u003e\n\u003ctd\u003e18 μm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eφ 16 mm\u003c\/td\u003e\n\u003ctd\u003e0\u003c\/td\u003e\n\u003ctd\u003e−18 μm\u003c\/td\u003e\n\u003ctd\u003e18 μm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eφ 20 mm\u003c\/td\u003e\n\u003ctd\u003e0\u003c\/td\u003e\n\u003ctd\u003e−21 μm\u003c\/td\u003e\n\u003ctd\u003e21 μm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003eFor rotating applications (bearings, bushings): pair with H7 bore tolerance for a standard clearance fit (H7\/h6). For sliding\/guiding applications: H8 or H9 bore provides more clearance.\u003c\/p\u003e\n\n\u003ch2\u003eMaterial — A2 Stainless Steel (SUS304) 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\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eSUS304 (A2)\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\u003e18.00–20.00\u003c\/td\u003e\n\u003ctd\u003e8.00–10.50\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eMechanical Properties — A2-70 (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\u003eShoulder Tolerance\u003c\/td\u003e\n\u003ctd\u003eh6 (precision ground)\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\u003ePrecision h6 shoulder\u003c\/strong\u003e — ground to h6 tolerance for accurate pivot, guide, and bearing applications\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA2 Stainless Steel (SUS304)\u003c\/strong\u003e — excellent corrosion resistance in atmospheric, freshwater, food processing, and mild chemical environments\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePassivated natural finish\u003c\/strong\u003e — clean silver appearance with enhanced oxide layer for superior rust resistance\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReduced thread diameter\u003c\/strong\u003e — thread is always smaller than shoulder, ensuring the shoulder bears the load\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 — smooth passivated shoulder compliant for food processing and medical equipment\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 7379 standard\u003c\/strong\u003e — internationally recognized specification for socket head shoulder screws\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCorrosion Resistance Guide — A2 (SUS304)\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eEnvironment\u003c\/th\u003e\n\u003cth\u003eA2 (SUS304) 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\u003eVery good\u003c\/td\u003e\n\u003ctd\u003e✅ Suitable\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFood processing \/ pharmaceutical\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\u003eFreshwater \/ mild humidity\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\u003eMild chemical exposure\u003c\/td\u003e\n\u003ctd\u003eGood\u003c\/td\u003e\n\u003ctd\u003e✅ Generally suitable\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSaltwater \/ marine (direct)\u003c\/td\u003e\n\u003ctd\u003eLimited\u003c\/td\u003e\n\u003ctd\u003e⚠️ Consider A4 (SUS316)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStrong acids \/ chlorides\u003c\/td\u003e\n\u003ctd\u003ePoor\u003c\/td\u003e\n\u003ctd\u003e❌ Not recommended\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 7379 A2 stainless steel socket head shoulder screws are widely used in corrosion-sensitive precision pivot and guide applications:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eFood processing and packaging machinery — pivot pins and linkage axes requiring corrosion resistance\u003c\/li\u003e\n\u003cli\u003ePharmaceutical and medical device manufacturing — precision pivots in hygienic environments\u003c\/li\u003e\n\u003cli\u003eOutdoor equipment and architectural hardware — hinges and pivot mechanisms exposed to weather\u003c\/li\u003e\n\u003cli\u003eLaboratory instruments and scientific equipment\u003c\/li\u003e\n\u003cli\u003eElectronics and semiconductor equipment — non-magnetic pivot requirements\u003c\/li\u003e\n\u003cli\u003eMarine and coastal equipment — pivot and guide applications in humid environments\u003c\/li\u003e\n\u003cli\u003eJigs and fixtures in corrosive environments\u003c\/li\u003e\n\u003cli\u003eAny precision pivot or guide application requiring corrosion-resistant shoulder screws\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eHow to Specify a Shoulder Screw\u003c\/h2\u003e\n\u003cp\u003eWhen ordering ISO 7379 shoulder screws, specify the following parameters:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eShoulder diameter (d1)\u003c\/strong\u003e — the functional diameter that mates with your bearing or bushing bore (e.g., φ8 mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShoulder length (l1)\u003c\/strong\u003e — the length of the smooth shoulder section (e.g., 20 mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread size (d2)\u003c\/strong\u003e — determined by shoulder diameter per ISO 7379 table (e.g., M6 for φ8 mm shoulder)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eExample specification: \u003cstrong\u003eISO 7379 — 8 × 20 — A2-70\u003c\/strong\u003e (shoulder diameter 8 mm, shoulder length 20 mm, A2-70 stainless)\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What is the difference between a shoulder screw and a standard socket cap screw?\u003c\/strong\u003e\u003cbr\u003e\nA standard socket cap screw has a uniform thread along its full body length. A shoulder screw (ISO 7379) has a precision-ground smooth shoulder that is larger in diameter than the thread. The shoulder is the functional element — it acts as a precision shaft for bearings, bushings, and pivots. The thread only provides clamping force.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What bore tolerance should I use with an h6 shoulder screw?\u003c\/strong\u003e\u003cbr\u003e\nFor rotating applications (bearings, bushings): use H7 bore tolerance for a standard clearance fit (H7\/h6). For sliding\/guiding applications: use H8 or H9 bore for more clearance.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Why choose A2 stainless instead of Grade 12.9 alloy steel for shoulder screws?\u003c\/strong\u003e\u003cbr\u003e\nIf your application involves corrosive environments, food processing, medical equipment, or requires non-magnetic properties, A2 stainless is the correct choice. For high-load dynamic applications requiring maximum strength (1,220 MPa), Grade 12.9 SCM440 is preferred.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Does the passivation treatment affect the h6 shoulder tolerance?\u003c\/strong\u003e\u003cbr\u003e\nNo. Passivation is a chemical surface treatment that removes free iron and enhances the natural oxide layer. It has no measurable effect on shoulder dimensions. The h6 tolerance is maintained after passivation.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Can I get dimensional inspection reports for the shoulder diameter?\u003c\/strong\u003e\u003cbr\u003e\nYes. FULLERKREG provides shoulder diameter inspection reports, material certificates, and PPAP documentation upon request.\u003c\/p\u003e\n\n\u003ch2\u003ePackaging \u0026amp; Availability\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eShoulder diameters φ5 – φ20 mm available in multiple shoulder lengths\u003c\/li\u003e\n\u003cli\u003eBulk carton packaging; small box and custom packaging available\u003c\/li\u003e\n\u003cli\u003eShoulder diameter inspection reports and material certificates available on request\u003c\/li\u003e\n\u003cli\u003ePPAP report available on request\u003c\/li\u003e\n\u003cli\u003eCustom shoulder 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\/ISO7379.pdf?v=1779098946\" title=\"ISO 7379 Socket Head Shoulder Screw Dimensional Specification PDF\"\u003eISO 7379 — 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 7379 A2 stainless steel socket head shoulder screws are manufactured under strict quality control procedures including:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eShoulder diameter inspection (h6 tolerance verification)\u003c\/li\u003e\n\u003cli\u003eHardness test (≤95 HRB)\u003c\/li\u003e\n\u003cli\u003eTensile strength test (min. 700 MPa)\u003c\/li\u003e\n\u003cli\u003eSurface roughness inspection (shoulder ground finish)\u003c\/li\u003e\n\u003cli\u003eDimensional inspection per ISO 7379\u003c\/li\u003e\n\u003cli\u003eChemical composition verification (SUS304)\u003c\/li\u003e\n\u003cli\u003ePPAP documentation available upon request\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eFor wholesale pricing, bulk orders, custom shoulder lengths, 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\/iso-7379-socket-head-shoulder-screw-a2-stainless.oembed","provider":"Fullerkreg Fasteners","version":"1.0","type":"link"}