{"title":"DIN 916 \/ ISO 4029 Socket Set Screw Cup Point A2 Stainless","description":"\u003ch2\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0054\/6317\/9375\/files\/din916-3-3.webp?v=1784446803\" alt=\"\"\u003e\u003c\/h2\u003e\n\u003ch2\u003eDIN 916 \/ ISO 4029 — Socket Set Screw with Cup Point | A2 Stainless Steel\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eBrand:\u003c\/strong\u003e FULLERKREG  |  \u003cstrong\u003eMaterial:\u003c\/strong\u003e A2 Stainless Steel (SUS304)  |  \u003cstrong\u003eSurface:\u003c\/strong\u003e Passivated (Bright Finish)\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eProduct Overview\u003c\/h2\u003e\n\u003cp\u003eFULLERKREG DIN 916 \/ ISO 4029 Socket Set Screws with Cup Point in A2 Stainless Steel (SUS304) are precision headless set screws engineered for corrosion-sensitive environments where alloy steel is unsuitable. The cup point geometry — a concave spherical recess at the tip — bites into the mating shaft surface to deliver reliable clamping, anti-rotation, and positioning performance. Combined with the inherent corrosion resistance of A2 stainless steel and a bright passivated finish, these set screws are the preferred choice for food processing, marine, pharmaceutical, chemical, and outdoor industrial applications.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eStandards \u0026amp; Specifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandards:\u003c\/strong\u003e DIN 916, ISO 4029\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Form:\u003c\/strong\u003e ISO Metric Coarse Thread (per ISO 68-1)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Tolerance:\u003c\/strong\u003e 6g (per ISO 965-1)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrive Type:\u003c\/strong\u003e Hexagon Socket (Allen \/ Hex Key)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePoint Type:\u003c\/strong\u003e Cup Point — concave spherical recess at tip\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e A2 Stainless Steel (SUS304 \/ 1.4301 \/ 18-8)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial Grade:\u003c\/strong\u003e A2 per ISO 3506-3\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSurface Treatment:\u003c\/strong\u003e Passivated — bright, clean finish with enhanced corrosion resistance\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplicable Standard for Mechanical Properties:\u003c\/strong\u003e ISO 3506-3\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003eMaterial \u0026amp; Mechanical Properties\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eProperty\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003cth\u003eStandard\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\u003eA2 Stainless Steel (SUS304 \/ 1.4301)\u003c\/td\u003e\n\u003ctd\u003eISO 3506-3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eChemical Composition (Cr)\u003c\/td\u003e\n\u003ctd\u003e17.5 – 19.5%\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eChemical Composition (Ni)\u003c\/td\u003e\n\u003ctd\u003e8.0 – 10.5%\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMinimum Tensile Strength\u003c\/td\u003e\n\u003ctd\u003e700 MPa (A2-70)\u003c\/td\u003e\n\u003ctd\u003eISO 3506-3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHardness (typical)\u003c\/td\u003e\n\u003ctd\u003eHV 200 – 300\u003c\/td\u003e\n\u003ctd\u003eISO 3506-3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThread Tolerance\u003c\/td\u003e\n\u003ctd\u003e6g\u003c\/td\u003e\n\u003ctd\u003eISO 965-1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSurface Treatment\u003c\/td\u003e\n\u003ctd\u003ePassivated (Bright \/ 洗白钝化)\u003c\/td\u003e\n\u003ctd\u003e—\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-196°C to +800°C (intermittent)\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cem\u003eNote: A2 stainless steel set screws are not hardened to the same level as alloy steel 45H\/12.9 grade. For applications requiring maximum holding force on hardened shafts, alloy steel grade is recommended. A2 is optimized for corrosion resistance.\u003c\/em\u003e\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eSurface Treatment: Passivation (洗白钝化)\u003c\/h2\u003e\n\u003cp\u003eAll FULLERKREG A2 stainless set screws undergo a passivation treatment after manufacturing:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eProcess:\u003c\/strong\u003e Acid passivation (citric acid or nitric acid bath) removes free iron and surface contaminants from the machined surface.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResult:\u003c\/strong\u003e A bright, clean, silver-white finish with a reinforced chromium oxide passive layer.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBenefit:\u003c\/strong\u003e Significantly enhances corrosion resistance beyond the as-machined state, especially in chloride-containing environments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAppearance:\u003c\/strong\u003e Uniform bright metallic finish — no discoloration, no scale, no heat tint.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003eDimensional Range\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eThread Size\u003c\/th\u003e\n\u003cth\u003ePitch (mm)\u003c\/th\u003e\n\u003cth\u003eSocket Size s (mm)\u003c\/th\u003e\n\u003cth\u003eLength Range (mm)\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eM3\u003c\/td\u003e\n\u003ctd\u003e0.5\u003c\/td\u003e\n\u003ctd\u003e1.5\u003c\/td\u003e\n\u003ctd\u003e3 – 16\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eM4\u003c\/td\u003e\n\u003ctd\u003e0.7\u003c\/td\u003e\n\u003ctd\u003e2.0\u003c\/td\u003e\n\u003ctd\u003e4 – 20\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\u003e2.5\u003c\/td\u003e\n\u003ctd\u003e5 – 25\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\u003e3.0\u003c\/td\u003e\n\u003ctd\u003e6 – 30\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\u003e4.0\u003c\/td\u003e\n\u003ctd\u003e8 – 40\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\u003e5.0\u003c\/td\u003e\n\u003ctd\u003e10 – 50\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\u003e6.0\u003c\/td\u003e\n\u003ctd\u003e12 – 60\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\u003e8.0\u003c\/td\u003e\n\u003ctd\u003e16 – 80\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eM20\u003c\/td\u003e\n\u003ctd\u003e2.5\u003c\/td\u003e\n\u003ctd\u003e10.0\u003c\/td\u003e\n\u003ctd\u003e20 – 100\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eM24\u003c\/td\u003e\n\u003ctd\u003e3.0\u003c\/td\u003e\n\u003ctd\u003e12.0\u003c\/td\u003e\n\u003ctd\u003e25 – 120\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cem\u003eCustom lengths and special configurations available upon request. Contact FULLERKREG for non-standard requirements.\u003c\/em\u003e\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eCup Point Geometry\u003c\/h2\u003e\n\u003cp\u003eThe cup point (concave spherical recess) is the defining feature of DIN 916 \/ ISO 4029 set screws. Key functional advantages:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePositive mechanical lock:\u003c\/strong\u003e The rim of the cup bites into the shaft surface, resisting rotation and axial movement.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReduced shaft damage:\u003c\/strong\u003e The concave geometry distributes contact stress more evenly than cone or dog points, minimizing shaft marring.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVibration resistance:\u003c\/strong\u003e Reliable performance under dynamic and cyclic loads.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRepositionable:\u003c\/strong\u003e Allows limited repositioning without severe shaft damage.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVersatile:\u003c\/strong\u003e Suitable for both hardened and unhardened shafts; ideal for stainless and non-ferrous shafts in corrosive environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003eCorrosion Resistance of A2 Stainless Steel\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eExcellent resistance\u003c\/strong\u003e to atmospheric corrosion, fresh water, mild acids, and alkalis.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGood resistance\u003c\/strong\u003e to food acids, dilute organic acids, and many chemical environments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModerate resistance\u003c\/strong\u003e to chloride environments — suitable for light marine exposure; for severe marine or seawater immersion, A4 (SUS316) is recommended.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNot recommended\u003c\/strong\u003e for strong reducing acids (e.g., hydrochloric acid) or high-chloride immersion without additional protection.\u003c\/li\u003e\n\u003cli\u003ePassivation further enhances the natural chromium oxide passive layer, improving resistance to pitting and crevice corrosion.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003eTypical Applications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eFood processing and beverage equipment (FDA-compatible environments)\u003c\/li\u003e\n\u003cli\u003ePharmaceutical and medical device manufacturing\u003c\/li\u003e\n\u003cli\u003eChemical processing equipment and laboratory instruments\u003c\/li\u003e\n\u003cli\u003eMarine and coastal outdoor installations\u003c\/li\u003e\n\u003cli\u003eShaft-to-hub locking in corrosive or washdown environments\u003c\/li\u003e\n\u003cli\u003ePumps, valves, and fluid handling systems\u003c\/li\u003e\n\u003cli\u003eSemiconductor and cleanroom equipment\u003c\/li\u003e\n\u003cli\u003eArchitectural and decorative hardware requiring a bright finish\u003c\/li\u003e\n\u003cli\u003eGeneral industrial machinery in humid or wet environments\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003eA2 vs. 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 Product)\u003c\/th\u003e\n\u003cth\u003eAlloy Steel 45H\/12.9\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eCorrosion Resistance\u003c\/td\u003e\n\u003ctd\u003e✅ Excellent\u003c\/td\u003e\n\u003ctd\u003e⚠️ Limited (Black Oxide only)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSurface Hardness\u003c\/td\u003e\n\u003ctd\u003eHV 200–300 (moderate)\u003c\/td\u003e\n\u003ctd\u003eHRC 45–53 (very high)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTensile Strength\u003c\/td\u003e\n\u003ctd\u003e700 MPa (A2-70)\u003c\/td\u003e\n\u003ctd\u003e1220 MPa (12.9)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHolding Force on Hard Shafts\u003c\/td\u003e\n\u003ctd\u003e⚠️ Moderate\u003c\/td\u003e\n\u003ctd\u003e✅ Maximum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFood \/ Pharma Suitability\u003c\/td\u003e\n\u003ctd\u003e✅ Yes\u003c\/td\u003e\n\u003ctd\u003e❌ Not recommended\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAppearance\u003c\/td\u003e\n\u003ctd\u003eBright silver-white\u003c\/td\u003e\n\u003ctd\u003eMatte black\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMagnetic\u003c\/td\u003e\n\u003ctd\u003eSlightly (work-hardened)\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003chr\u003e\n\u003ch2\u003eInstallation Guidelines\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eUse the correct hex key (Allen wrench) matching the socket size — refer to the dimensional table above.\u003c\/li\u003e\n\u003cli\u003eEnsure the shaft and bore are clean and free of oil or debris before installation.\u003c\/li\u003e\n\u003cli\u003eFor vibration-critical applications, apply a stainless-compatible thread-locking compound (e.g., Loctite 243 or equivalent).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAnti-galling precaution:\u003c\/strong\u003e Stainless steel fasteners are susceptible to galling (cold welding) during installation. Apply anti-seize compound (e.g., nickel-based anti-seize) to the threads before tightening to prevent seizure.\u003c\/li\u003e\n\u003cli\u003eTighten slowly and steadily — avoid high-speed power tools which increase galling risk.\u003c\/li\u003e\n\u003cli\u003eDo not exceed the rated tightening torque for the thread size and A2-70 grade.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003eQuality Assurance\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensional Inspection:\u003c\/strong\u003e 100% thread gauge inspection per ISO 965-1 (6g tolerance)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial Verification:\u003c\/strong\u003e PMI (Positive Material Identification) \/ spectrometer analysis for SUS304 composition\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHardness Testing:\u003c\/strong\u003e Vickers hardness test per ISO 3506-3\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTensile \/ Proof Load Testing:\u003c\/strong\u003e Per ISO 3506-3 (A2-70)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSalt Spray Test:\u003c\/strong\u003e Corrosion resistance verification post-passivation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSocket Torque Test:\u003c\/strong\u003e Drive socket integrity verification\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLot Traceability:\u003c\/strong\u003e Full material and process traceability per batch\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003ePackaging Options\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eBulk (polybag or carton) — standard for wholesale orders\u003c\/li\u003e\n\u003cli\u003eSmall box (labeled, per size) — available for mixed or sample orders\u003c\/li\u003e\n\u003cli\u003eCustom packaging — available for OEM and private-label customers\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003eOrdering Information\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrice:\u003c\/strong\u003e Unit price per piece (USD), not per thousand. Contact us for volume pricing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCustomer Base:\u003c\/strong\u003e B2B wholesale only. We do not serve retail \/ B2C customers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOrder Method:\u003c\/strong\u003e All orders are placed offline. Online prices are for reference and inquiry only. Please contact us via email to place orders.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMOQ:\u003c\/strong\u003e Varies by size — contact FULLERKREG for minimum order quantities.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLead Time (Small Batch):\u003c\/strong\u003e Approx. 30 days, delivered DDP.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLead Time (Large Volume):\u003c\/strong\u003e FOB Shanghai; other Incoterms negotiable.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCustom Orders:\u003c\/strong\u003e Non-standard lengths, special configurations, or OEM requirements available upon request.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What is the difference between DIN 916 and ISO 4029?\u003c\/strong\u003e\u003cbr\u003eA: DIN 916 is the German standard; ISO 4029 is the international equivalent. Both specify the same cup point set screw geometry and are dimensionally interchangeable. FULLERKREG products comply with both standards.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What does A2 stainless steel mean?\u003c\/strong\u003e\u003cbr\u003eA: A2 is the designation for austenitic stainless steel per ISO 3506-3, corresponding to SUS304 \/ 1.4301 (18% Chromium, 8–10% Nickel). It offers excellent general corrosion resistance and is the most widely used stainless steel grade for fasteners.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What is passivation (洗白钝化)?\u003c\/strong\u003e\u003cbr\u003eA: Passivation is an acid treatment process that removes free iron and surface contaminants from the stainless steel surface, restoring and enhancing the natural chromium oxide passive layer. The result is a bright, clean, silver-white finish with improved corrosion resistance.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Are A2 stainless set screws suitable for marine environments?\u003c\/strong\u003e\u003cbr\u003eA: A2 (SUS304) provides good resistance to light marine and coastal environments. For direct seawater immersion or high-chloride splash zones, A4 (SUS316) is recommended. Contact FULLERKREG if you require A4 grade.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Why do stainless steel set screws sometimes seize during installation?\u003c\/strong\u003e\u003cbr\u003eA: Stainless steel is prone to galling (cold welding) due to its tendency to work-harden under friction. To prevent this, always apply an anti-seize compound to the threads before installation and tighten slowly by hand or with a calibrated torque wrench.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Can A2 stainless set screws lock onto hardened shafts?\u003c\/strong\u003e\u003cbr\u003eA: A2 stainless has moderate surface hardness (HV 200–300). It can engage unhardened and lightly hardened shafts effectively. For very hard shafts (HRC 40+), alloy steel 45H\/12.9 grade set screws provide superior bite and holding force.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Do you offer custom lengths or thread pitches?\u003c\/strong\u003e\u003cbr\u003eA: Yes. FULLERKREG can produce non-standard configurations. 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