{"title":"Hex Socket Head Cap SEMS Screw FW + LW - Alloy Steel 12.9 Zinc","description":"\u003ch1\u003eHex Socket Head Cap SEMS Screw FW + LW - Alloy Steel 12.9 Zinc\u003c\/h1\u003e\n\n\u003cp\u003eFULLERKREG Class 12.9 Zinc-Plated Alloy Steel Socket Cap Head SEMS Screws combine an ISO 4762 hex socket cap head screw with two permanently captivated washers - a \u003cstrong\u003eDIN 125 standard flat washer (FW)\u003c\/strong\u003e and a \u003cstrong\u003elock washer (LW)\u003c\/strong\u003e - assembled onto the shank by thread rolling. Manufactured from \u003cstrong\u003e40Cr alloy steel\u003c\/strong\u003e and finished with an \u003cstrong\u003eelectrolytic zinc plating\u003c\/strong\u003e surface treatment, these screws deliver the highest strength class available in the SEMS range - minimum tensile strength of \u003cstrong\u003e1220 MPa\u003c\/strong\u003e - combined with enhanced corrosion resistance from the zinc coating and the assembly efficiency of a pre-assembled captive washer system. The bright zinc finish provides a clean, professional appearance suitable for general industrial, automotive, and machinery applications where both high strength and moderate corrosion protection are required.\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eWhat are Socket Cap Head SEMS Screws?\u003c\/h2\u003e\n\n\u003cp\u003eSEMS (pre-assembled screw and washer) screws are integrated fasteners that permanently combine a socket cap head screw with one or more captive washers into a single handling unit. The washers are retained on the screw shank during manufacturing via a \u003cstrong\u003ethread-rolling process\u003c\/strong\u003e: washers are loaded onto the screw blank before threads are rolled, and the resulting thread shoulder prevents washer removal while allowing free rotation.\u003c\/p\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eFW + LW (Flat Washer + Lock Washer)\u003c\/strong\u003e double washer configuration pairs a \u003cstrong\u003eDIN 125 standard flat washer\u003c\/strong\u003e with a \u003cstrong\u003espring lock washer\u003c\/strong\u003e. The flat washer distributes the clamping load over a wider bearing area, while the lock washer provides mechanical resistance to loosening under vibration and dynamic loading. The hex socket (Allen key) drive head conforms to \u003cstrong\u003eISO 4762\u003c\/strong\u003e, delivering high torque capacity and compatibility with standard hex key tooling across M3 to M16 thread sizes.\u003c\/p\u003e\n\n\u003cp\u003eIn the \u003cstrong\u003eClass 12.9 zinc-plated\u003c\/strong\u003e variant, the screw body is manufactured from \u003cstrong\u003e40Cr chromium alloy steel\u003c\/strong\u003e, heat-treated to achieve the exceptional mechanical properties of property class 12.9, then electroplated with zinc to provide corrosion protection superior to black oxide while maintaining the full structural performance of the 12.9 grade. Note: zinc plating of Class 12.9 fasteners requires strict hydrogen embrittlement relief baking per ISO 4042 to maintain mechanical integrity.\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eBenefits of Using SEMS Screws\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eExceptional tensile strength\u003c\/strong\u003e - Class 12.9 alloy steel delivers a minimum tensile strength of 1220 MPa and proof load stress of 970 MPa, making these the highest-strength SEMS screws in the FULLERKREG range, suitable for the most demanding structural and dynamic load applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnhanced corrosion resistance vs. black oxide\u003c\/strong\u003e - electrolytic zinc plating provides significantly better corrosion protection than black oxide finish, offering resistance to atmospheric corrosion, humidity, and mild chemical exposure in general industrial environments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSuperior vibration resistance\u003c\/strong\u003e - the integrated spring lock washer provides mechanical anti-loosening performance under high vibration, shock, and dynamic loading without additional locking compounds or inserts.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEliminates loose washers\u003c\/strong\u003e - the DIN 125 flat washer and lock washer are permanently captivated; they cannot be lost during kitting, handling, or installation, eliminating assembly errors and line stoppages.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFaster assembly\u003c\/strong\u003e - one integrated component replaces three separate parts (screw + flat washer + lock washer), reducing cycle time and operator handling steps in high-volume production.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConsistent washer positioning\u003c\/strong\u003e - the washer is always correctly seated and centred under the head, ensuring uniform clamping load and preventing misalignment or tilting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBright professional appearance\u003c\/strong\u003e - the zinc-plated finish provides a clean, bright silver appearance suitable for visible assemblies and customer-facing equipment where aesthetics matter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompact high-strength fastening\u003c\/strong\u003e - the socket cap head profile provides a low-profile, high-strength fastening solution suitable for confined spaces and recessed hole applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReduced inventory complexity\u003c\/strong\u003e - one SKU replaces three separate part numbers, simplifying procurement, storage, and BOM management.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAutomation-friendly\u003c\/strong\u003e - the single-piece design is compatible with automated feeding and driving equipment, supporting high-volume production lines.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eLimitations of Using SEMS Screws\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHydrogen embrittlement risk\u003c\/strong\u003e - Class 12.9 high-strength alloy steel is susceptible to hydrogen embrittlement during electroplating. Zinc-plated Class 12.9 fasteners must undergo mandatory hydrogen embrittlement relief baking (typically 200-230 degrees C for minimum 4 hours) per ISO 4042 \/ ASTM F1941 immediately after plating. Failure to bake can result in delayed brittle fracture under load.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNot suitable for marine or highly corrosive environments\u003c\/strong\u003e - zinc plating provides moderate corrosion protection; for marine, offshore, or chemical environments, specify stainless steel grades (A2-70 or A4-70).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFixed washer configuration\u003c\/strong\u003e - the DIN 125 washer type and size are determined at manufacture and cannot be changed or substituted in the field.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigher unit cost than lower grades\u003c\/strong\u003e - Class 12.9 alloy steel carries a material and processing premium over Class 8.8 or 10.9; specify 12.9 only where load requirements justify the cost.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRequires controlled tightening\u003c\/strong\u003e - the high strength of Class 12.9 requires accurate torque control during installation to avoid over-tightening and thread stripping in lower-strength mating materials.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eZinc coating adds slight dimensional increase\u003c\/strong\u003e - electrolytic zinc plating adds 5-15 microns per surface; verify thread fit with mating components in precision applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWasher cannot be removed for inspection\u003c\/strong\u003e - the captive design means washer condition cannot be independently inspected or replaced without replacing the entire fastener.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eMaterial \/ Finish\u003c\/h2\u003e\n\n\u003ctable border=\"1\" cellpadding=\"6\" cellspacing=\"0\" style=\"border-collapse:collapse;width:100%;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background-color:#1a3c5e;color:#ffffff;\"\u003e\n\u003cth\u003eComponent\u003c\/th\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003cth\u003eGrade \/ Standard\u003c\/th\u003e\n\u003cth\u003eSurface Treatment\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eScrew Body\u003c\/td\u003e\n\u003ctd\u003e40Cr Chromium Alloy Steel\u003c\/td\u003e\n\u003ctd\u003eClass 12.9 (ISO 898-1)\u003c\/td\u003e\n\u003ctd\u003eElectrolytic Zinc Plating\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color:#f5f5f5;\"\u003e\n\u003ctd\u003eStandard Flat Washer (DIN 125)\u003c\/td\u003e\n\u003ctd\u003eAlloy Steel \/ Carbon Steel\u003c\/td\u003e\n\u003ctd\u003eDIN 125 \/ ISO 7089\u003c\/td\u003e\n\u003ctd\u003eZinc Plated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLock Washer\u003c\/td\u003e\n\u003ctd\u003eAlloy Steel \/ Carbon Steel\u003c\/td\u003e\n\u003ctd\u003eISO Standard\u003c\/td\u003e\n\u003ctd\u003eZinc Plated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eClass 12.9 Mechanical Properties (ISO 898-1)\u003c\/h3\u003e\n\n\u003ctable border=\"1\" cellpadding=\"6\" cellspacing=\"0\" style=\"border-collapse:collapse;width:100%;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background-color:#1a3c5e;color:#ffffff;\"\u003e\n\u003cth\u003eProperty\u003c\/th\u003e\n\u003cth\u003eClass 8.8\u003c\/th\u003e\n\u003cth\u003eClass 10.9\u003c\/th\u003e\n\u003cth\u003eClass 12.9\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eMin. Tensile Strength (MPa)\u003c\/td\u003e\n\u003ctd\u003e800\u003c\/td\u003e\n\u003ctd\u003e1040\u003c\/td\u003e\n\u003ctd\u003e1220\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color:#f5f5f5;\"\u003e\n\u003ctd\u003eMin. Yield Strength (MPa)\u003c\/td\u003e\n\u003ctd\u003e640\u003c\/td\u003e\n\u003ctd\u003e940\u003c\/td\u003e\n\u003ctd\u003e1100\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProof Load Stress (MPa)\u003c\/td\u003e\n\u003ctd\u003e580\u003c\/td\u003e\n\u003ctd\u003e830\u003c\/td\u003e\n\u003ctd\u003e970\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color:#f5f5f5;\"\u003e\n\u003ctd\u003eMin. Elongation (%)\u003c\/td\u003e\n\u003ctd\u003e12\u003c\/td\u003e\n\u003ctd\u003e9\u003c\/td\u003e\n\u003ctd\u003e8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHardness (HRC)\u003c\/td\u003e\n\u003ctd\u003e22-32\u003c\/td\u003e\n\u003ctd\u003e32-39\u003c\/td\u003e\n\u003ctd\u003e39-44\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eZinc Plating vs. Black Oxide - Finish Comparison\u003c\/h3\u003e\n\n\u003ctable border=\"1\" cellpadding=\"6\" cellspacing=\"0\" style=\"border-collapse:collapse;width:100%;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background-color:#1a3c5e;color:#ffffff;\"\u003e\n\u003cth\u003eProperty\u003c\/th\u003e\n\u003cth\u003eBlack Oxide\u003c\/th\u003e\n\u003cth\u003eZinc Plated (This Product)\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eAppearance\u003c\/td\u003e\n\u003ctd\u003eMatte black\u003c\/td\u003e\n\u003ctd\u003eBright silver\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color:#f5f5f5;\"\u003e\n\u003ctd\u003eCoating Thickness\u003c\/td\u003e\n\u003ctd\u003eLess than 1 micron\u003c\/td\u003e\n\u003ctd\u003e5-15 microns\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSalt Spray Resistance\u003c\/td\u003e\n\u003ctd\u003eApprox. 2-8 hours\u003c\/td\u003e\n\u003ctd\u003eApprox. 72-200 hours\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color:#f5f5f5;\"\u003e\n\u003ctd\u003eCorrosion Protection\u003c\/td\u003e\n\u003ctd\u003eMild (indoor dry only)\u003c\/td\u003e\n\u003ctd\u003eModerate (general industrial)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHydrogen Embrittlement Risk\u003c\/td\u003e\n\u003ctd\u003eNone (chemical conversion)\u003c\/td\u003e\n\u003ctd\u003eYes - baking required per ISO 4042\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color:#f5f5f5;\"\u003e\n\u003ctd\u003eDimensional Impact\u003c\/td\u003e\n\u003ctd\u003eNegligible\u003c\/td\u003e\n\u003ctd\u003e5-15 microns per surface\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRoHS Compliance\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003eYes (trivalent zinc only)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cp\u003e\u003cem\u003eAll finishes are RoHS compliant. Hexavalent chromium (Cr6+) passivation is not used. Trivalent chromium (Cr3+) passivation only.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eDimensions of Pre-Assembled Washers in SEMS Screws\u003c\/h2\u003e\n\n\u003cp\u003eThe FW + LW configuration uses \u003cstrong\u003eDIN 125 standard flat washers\u003c\/strong\u003e (equivalent to ISO 7089). The following table shows the inner diameter (d1), outer diameter (d2), and thickness (t) of the captive DIN 125 flat washers by thread size:\u003c\/p\u003e\n\n\u003ch3\u003eDIN 125 Standard Plain Washer (FW)\u003c\/h3\u003e\n\n\u003ctable border=\"1\" cellpadding=\"6\" cellspacing=\"0\" style=\"border-collapse:collapse;width:100%;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background-color:#1a3c5e;color:#ffffff;\"\u003e\n\u003cth\u003eThread Size\u003c\/th\u003e\n\u003cth\u003eM3\u003c\/th\u003e\n\u003cth\u003eM4\u003c\/th\u003e\n\u003cth\u003eM5\u003c\/th\u003e\n\u003cth\u003eM6\u003c\/th\u003e\n\u003cth\u003eM8\u003c\/th\u003e\n\u003cth\u003eM10\u003c\/th\u003e\n\u003cth\u003eM12\u003c\/th\u003e\n\u003cth\u003eM14\u003c\/th\u003e\n\u003cth\u003eM16\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ed1 - Inner Dia. (mm)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e3.2\u003c\/td\u003e\n\u003ctd\u003e4.3\u003c\/td\u003e\n\u003ctd\u003e5.3\u003c\/td\u003e\n\u003ctd\u003e6.4\u003c\/td\u003e\n\u003ctd\u003e8.4\u003c\/td\u003e\n\u003ctd\u003e10.5\u003c\/td\u003e\n\u003ctd\u003e13.0\u003c\/td\u003e\n\u003ctd\u003e15.0\u003c\/td\u003e\n\u003ctd\u003e17.0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color:#f5f5f5;\"\u003e\n\u003ctd\u003e\u003cstrong\u003ed2 - Outer Dia. (mm)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e7.0\u003c\/td\u003e\n\u003ctd\u003e9.0\u003c\/td\u003e\n\u003ctd\u003e10.0\u003c\/td\u003e\n\u003ctd\u003e12.5\u003c\/td\u003e\n\u003ctd\u003e17.0\u003c\/td\u003e\n\u003ctd\u003e21.0\u003c\/td\u003e\n\u003ctd\u003e24.0\u003c\/td\u003e\n\u003ctd\u003e28.0\u003c\/td\u003e\n\u003ctd\u003e30.0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003et - Thickness (mm)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0.5\u003c\/td\u003e\n\u003ctd\u003e0.8\u003c\/td\u003e\n\u003ctd\u003e1.0\u003c\/td\u003e\n\u003ctd\u003e1.6\u003c\/td\u003e\n\u003ctd\u003e1.6\u003c\/td\u003e\n\u003ctd\u003e2.0\u003c\/td\u003e\n\u003ctd\u003e2.5\u003c\/td\u003e\n\u003ctd\u003e2.5\u003c\/td\u003e\n\u003ctd\u003e3.0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cp style=\"font-size:12px;\"\u003eAll dimensions per DIN 125 \/ ISO 7089 standard. All dimensions in mm. Note: zinc plating adds 5-15 microns per surface to all dimensions.\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eDimensional Data - Metric Series (ISO 4762 Head, Class 12.9)\u003c\/h2\u003e\n\n\u003cp\u003eAll dimensions in mm. Head dimensions conform to \u003cstrong\u003eISO 4762\u003c\/strong\u003e. Thread tolerance Class 6g (before plating). Column D reflects the DIN 125 standard washer outer diameter.\u003c\/p\u003e\n\n\u003ctable border=\"1\" cellpadding=\"6\" cellspacing=\"0\" style=\"border-collapse:collapse;width:100%;font-size:13px;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background-color:#1a3c5e;color:#ffffff;\"\u003e\n\u003cth\u003eThread\u003c\/th\u003e\n\u003cth\u003ePitch (mm)\u003c\/th\u003e\n\u003cth\u003eA - Head Diam (mm)\u003c\/th\u003e\n\u003cth\u003eB - Head Ht (mm)\u003c\/th\u003e\n\u003cth\u003eC - A\/F Recess (mm)\u003c\/th\u003e\n\u003cth\u003eD - Washer Diam (mm)\u003c\/th\u003e\n\u003cth\u003eE - Washers Thk (mm)\u003c\/th\u003e\n\u003cth\u003eF (mm)\u003c\/th\u003e\n\u003cth\u003eUnit Weight (g)\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\u003e5.5\u003c\/td\u003e\n\u003ctd\u003e3.0\u003c\/td\u003e\n\u003ctd\u003e2.5\u003c\/td\u003e\n\u003ctd\u003e7.0\u003c\/td\u003e\n\u003ctd\u003e-\u003c\/td\u003e\n\u003ctd\u003e3.8\u003c\/td\u003e\n\u003ctd\u003e-\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color:#f5f5f5;\"\u003e\n\u003ctd\u003eM4\u003c\/td\u003e\n\u003ctd\u003e0.7\u003c\/td\u003e\n\u003ctd\u003e7.0\u003c\/td\u003e\n\u003ctd\u003e4.0\u003c\/td\u003e\n\u003ctd\u003e3.0\u003c\/td\u003e\n\u003ctd\u003e9.0\u003c\/td\u003e\n\u003ctd\u003e-\u003c\/td\u003e\n\u003ctd\u003e4.6\u003c\/td\u003e\n\u003ctd\u003e-\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\u003e8.5\u003c\/td\u003e\n\u003ctd\u003e5.0\u003c\/td\u003e\n\u003ctd\u003e4.0\u003c\/td\u003e\n\u003ctd\u003e10.0\u003c\/td\u003e\n\u003ctd\u003e-\u003c\/td\u003e\n\u003ctd\u003e5.6\u003c\/td\u003e\n\u003ctd\u003e-\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color:#f5f5f5;\"\u003e\n\u003ctd\u003eM6\u003c\/td\u003e\n\u003ctd\u003e1.0\u003c\/td\u003e\n\u003ctd\u003e10.0\u003c\/td\u003e\n\u003ctd\u003e6.0\u003c\/td\u003e\n\u003ctd\u003e5.0\u003c\/td\u003e\n\u003ctd\u003e12.5\u003c\/td\u003e\n\u003ctd\u003e-\u003c\/td\u003e\n\u003ctd\u003e5.9\u003c\/td\u003e\n\u003ctd\u003e-\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\u003e13.0\u003c\/td\u003e\n\u003ctd\u003e8.0\u003c\/td\u003e\n\u003ctd\u003e6.0\u003c\/td\u003e\n\u003ctd\u003e17.0\u003c\/td\u003e\n\u003ctd\u003e-\u003c\/td\u003e\n\u003ctd\u003e7.8\u003c\/td\u003e\n\u003ctd\u003e-\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color:#f5f5f5;\"\u003e\n\u003ctd\u003eM10\u003c\/td\u003e\n\u003ctd\u003e1.5\u003c\/td\u003e\n\u003ctd\u003e16.0\u003c\/td\u003e\n\u003ctd\u003e10.0\u003c\/td\u003e\n\u003ctd\u003e8.0\u003c\/td\u003e\n\u003ctd\u003e21.0\u003c\/td\u003e\n\u003ctd\u003e-\u003c\/td\u003e\n\u003ctd\u003e9.4\u003c\/td\u003e\n\u003ctd\u003e-\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\u003e18.0\u003c\/td\u003e\n\u003ctd\u003e12.0\u003c\/td\u003e\n\u003ctd\u003e10.0\u003c\/td\u003e\n\u003ctd\u003e24.0\u003c\/td\u003e\n\u003ctd\u003e-\u003c\/td\u003e\n\u003ctd\u003e11.1\u003c\/td\u003e\n\u003ctd\u003e-\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color:#f5f5f5;\"\u003e\n\u003ctd\u003eM14\u003c\/td\u003e\n\u003ctd\u003e2.0\u003c\/td\u003e\n\u003ctd\u003e21.0\u003c\/td\u003e\n\u003ctd\u003e14.0\u003c\/td\u003e\n\u003ctd\u003e12.0\u003c\/td\u003e\n\u003ctd\u003e28.0\u003c\/td\u003e\n\u003ctd\u003e-\u003c\/td\u003e\n\u003ctd\u003e13.1\u003c\/td\u003e\n\u003ctd\u003e-\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\u003e24.0\u003c\/td\u003e\n\u003ctd\u003e16.0\u003c\/td\u003e\n\u003ctd\u003e14.0\u003c\/td\u003e\n\u003ctd\u003e30.0\u003c\/td\u003e\n\u003ctd\u003e-\u003c\/td\u003e\n\u003ctd\u003e15.1\u003c\/td\u003e\n\u003ctd\u003e-\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cp style=\"font-size:12px;\"\u003eF = Distance before full thread starts. E = Washers in compressed state (to be confirmed per size). All dimensions in mm. Unit Weight: to be updated, contact FULLERKREG for data sheets. Dimensions are nominal pre-plating values; zinc plating adds 5-15 microns per surface.\u003c\/p\u003e\n\n\u003ch3\u003eRecommended Tightening Torque - Class 12.9 (Reference Values)\u003c\/h3\u003e\n\n\u003ctable border=\"1\" cellpadding=\"6\" cellspacing=\"0\" style=\"border-collapse:collapse;width:100%;font-size:13px;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background-color:#1a3c5e;color:#ffffff;\"\u003e\n\u003cth\u003eThread\u003c\/th\u003e\n\u003cth\u003eM3\u003c\/th\u003e\n\u003cth\u003eM4\u003c\/th\u003e\n\u003cth\u003eM5\u003c\/th\u003e\n\u003cth\u003eM6\u003c\/th\u003e\n\u003cth\u003eM8\u003c\/th\u003e\n\u003cth\u003eM10\u003c\/th\u003e\n\u003cth\u003eM12\u003c\/th\u003e\n\u003cth\u003eM16\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eTorque (N.m)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e2.5\u003c\/td\u003e\n\u003ctd\u003e5.5\u003c\/td\u003e\n\u003ctd\u003e11\u003c\/td\u003e\n\u003ctd\u003e19\u003c\/td\u003e\n\u003ctd\u003e46\u003c\/td\u003e\n\u003ctd\u003e91\u003c\/td\u003e\n\u003ctd\u003e158\u003c\/td\u003e\n\u003ctd\u003e390\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cp style=\"font-size:12px;\"\u003eReference values for lubricated conditions (friction coefficient 0.12). For zinc-plated fasteners, lubrication is recommended to achieve consistent friction coefficient. Always verify torque requirements against joint design and mating material specifications.\u003c\/p\u003e\n\n\u003ch3\u003ePart Number Call-Out Guide\u003c\/h3\u003e\n\n\u003ctable border=\"1\" cellpadding=\"6\" cellspacing=\"0\" style=\"border-collapse:collapse;width:100%;font-size:13px;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background-color:#1a3c5e;color:#ffffff;\"\u003e\n\u003cth\u003eField\u003c\/th\u003e\n\u003cth\u003eDescription\u003c\/th\u003e\n\u003cth\u003eExample\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eDrive Type\u003c\/td\u003e\n\u003ctd\u003eHex Socket (Allen Key) - ISO 4762\u003c\/td\u003e\n\u003ctd\u003eSocket Cap Head\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color:#f5f5f5;\"\u003e\n\u003ctd\u003eWasher Config\u003c\/td\u003e\n\u003ctd\u003eFW = DIN 125 Flat Washer; LW = Lock Washer\u003c\/td\u003e\n\u003ctd\u003eFW + LW\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003e40Cr Alloy Steel, Class 12.9\u003c\/td\u003e\n\u003ctd\u003e12.9\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color:#f5f5f5;\"\u003e\n\u003ctd\u003eFinish\u003c\/td\u003e\n\u003ctd\u003eElectrolytic Zinc Plating (Trivalent Passivation)\u003c\/td\u003e\n\u003ctd\u003eZinc\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThread Size\u003c\/td\u003e\n\u003ctd\u003eMetric thread\u003c\/td\u003e\n\u003ctd\u003eM8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color:#f5f5f5;\"\u003e\n\u003ctd\u003eLength\u003c\/td\u003e\n\u003ctd\u003eUnderhead length in mm\u003c\/td\u003e\n\u003ctd\u003e20 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cp\u003e\u003cstrong\u003eAvailable Lengths:\u003c\/strong\u003e 6 mm - 8 mm - 10 mm - 12 mm - 16 mm - 20 mm - 25 mm - 30 mm - 35 mm - 40 mm - 45 mm - 50 mm\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eProduct Showcase\u003c\/h2\u003e\n\n\u003ctable border=\"0\" cellpadding=\"8\" cellspacing=\"0\" style=\"width:100%;table-layout:fixed;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"width:25%;text-align:center;vertical-align:top;border:1px solid #ddd;padding:16px;\"\u003e\u003cp style=\"color:#999;font-size:12px;\"\u003e[Product Image 1]\u003c\/p\u003e\u003c\/td\u003e\n\u003ctd style=\"width:25%;text-align:center;vertical-align:top;border:1px solid #ddd;padding:16px;\"\u003e\u003cp style=\"color:#999;font-size:12px;\"\u003e[Product Image 2]\u003c\/p\u003e\u003c\/td\u003e\n\u003ctd style=\"width:25%;text-align:center;vertical-align:top;border:1px solid #ddd;padding:16px;\"\u003e\u003cp style=\"color:#999;font-size:12px;\"\u003e[Product Image 3]\u003c\/p\u003e\u003c\/td\u003e\n\u003ctd style=\"width:25%;text-align:center;vertical-align:top;border:1px solid #ddd;padding:16px;\"\u003e\u003cp style=\"color:#999;font-size:12px;\"\u003e[Product Image 4]\u003c\/p\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eApplication\u003c\/h2\u003e\n\n\u003cp\u003eFULLERKREG Class 12.9 Zinc-Plated Alloy Steel Socket Cap Head SEMS Screws are engineered for high-strength fastening applications where both maximum tensile performance and moderate corrosion protection are required:\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAutomotive and Powertrain\u003c\/strong\u003e - engine block assembly, transmission housings, suspension components, and brake system fastening where Class 12.9 strength is mandatory and zinc plating provides protection against road salt and moisture exposure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeavy Machinery and Industrial Equipment\u003c\/strong\u003e - press frames, hydraulic cylinder end caps, gearbox housings, and structural machine joints subject to high static and dynamic loads in general industrial environments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAgricultural Equipment\u003c\/strong\u003e - combine harvesters, tractor assemblies, and implement attachments where high-strength fastening with moderate outdoor corrosion resistance is required.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConstruction Equipment\u003c\/strong\u003e - excavator attachments, crane structures, and heavy lifting equipment requiring Class 12.9 clamping force with protection against outdoor atmospheric exposure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTooling and Fixture Building\u003c\/strong\u003e - precision jigs, fixtures, and machining centres where high clamping force and dimensional stability are critical, with zinc plating providing protection during storage and transport.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRobotics and Automation\u003c\/strong\u003e - robot arm joints, servo motor mounts, linear guide rail fastening, and actuator brackets requiring high preload and vibration resistance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMining and Quarrying Equipment\u003c\/strong\u003e - crusher frames, conveyor drive units, and vibrating screen assemblies subject to extreme shock, vibration, and dusty outdoor environments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGeneral Industrial Assembly\u003c\/strong\u003e - any high-strength bolted joint in general industrial environments where atmospheric corrosion protection beyond black oxide is required but stainless steel is not specified.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eWhy FULLERKREG?\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003e🏭 \u003cstrong\u003eDirect Manufacturer\u003c\/strong\u003e - domestic production capability with full quality control; Class 12.9 material and mechanical property certificates available. Hydrogen embrittlement relief baking confirmed per ISO 4042.\u003c\/li\u003e\n\u003cli\u003e📐 \u003cstrong\u003eEngineering-Grade Data\u003c\/strong\u003e - complete dimensional data, hardness test reports, tensile test certificates, salt spray test reports, and material traceability documentation available on request.\u003c\/li\u003e\n\u003cli\u003e📦 \u003cstrong\u003eBulk and Wholesale Supply\u003c\/strong\u003e - competitive pricing for high-volume orders; custom packaging and kitting available for automotive and industrial OEM customers.\u003c\/li\u003e\n\u003cli\u003e🌍 \u003cstrong\u003eGlobal Distribution\u003c\/strong\u003e - experienced in international logistics; supply to automotive OEMs, Tier 1 suppliers, and industrial equipment manufacturers worldwide.\u003c\/li\u003e\n\u003cli\u003e✅ \u003cstrong\u003eCompliance\u003c\/strong\u003e - RoHS compliant trivalent zinc plating (no Cr6+); ISO 4762 head dimensions; ISO 898-1 Class 12.9 mechanical properties; ISO 4042 plating process compliance; full material traceability available.\u003c\/li\u003e\n\u003cli\u003e🔧 \u003cstrong\u003eCustom Specifications\u003c\/strong\u003e - special dimensions, lengths, fine thread pitches, alternative plating thicknesses, and yellow zinc or black zinc finishes available on request.\u003c\/li\u003e\n\u003cli\u003e⚠ \u003cstrong\u003eCritical Installation Note\u003c\/strong\u003e - Class 12.9 zinc-plated fasteners require accurate torque control. Always use a calibrated torque wrench and lubricate threads before installation. Do not re-use Class 12.9 fasteners in safety-critical joints after removal. Verify hydrogen embrittlement relief baking compliance before use in safety-critical applications.\u003c\/li\u003e\n\u003c\/ul\u003e","products":[],"url":"https:\/\/www.fullerkr.com\/collections\/hex-socket-head-cap-sems-screw-fw-lw-alloy-steel-12-9-zinc.oembed","provider":"Fullerkreg Fasteners","version":"1.0","type":"link"}