{"title":"GB\/T 9074.13-1988 Cross Recessed Hexagon Bolt with Indentation, Single Coil Lock Washer and Plain Washer Assemblies - Steel 8.8 - Zinc Cr3","description":"\u003ch1\u003eGB\/T 9074.13-1988 Cross Recessed Hexagon Bolt with Indentation, Single Coil Lock Washer and Plain Washer Assemblies — Carbon Steel 8.8, Zinc Cr3\u003c\/h1\u003e\n\u003cp\u003eFULLERKREG supplies GB\/T 9074.13-1988 carbon steel class 8.8 SEMS screws with trivalent zinc (Zinc Cr3) plating — pre-assembled three-piece fastener assemblies combining a cross recessed hexagon bolt, a single coil spring lock washer, and a plain washer into one captive unit. The high-strength 8.8 grade combined with RoHS-compliant Zinc Cr3 coating makes these the go-to choice for automotive, machinery, and industrial assembly applications requiring both strength and environmental compliance.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eWhat Are GB9074.13 Cross Recessed Hex SEMS Screws?\u003c\/h2\u003e\n\u003cp\u003eGB\/T 9074.13-1988 defines a three-piece pre-assembled fastener (SEMS) consisting of:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eGB29.2\u003c\/strong\u003e — Cross recessed hexagon head bolt (Phillips drive, hex head)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGB9074.24\u003c\/strong\u003e — Plain washer (assembly-grade flat washer)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGB9074.26\u003c\/strong\u003e — Single coil spring lock washer (assembly-grade spring washer)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe three components are permanently captivated onto the bolt shank before thread rolling. After threading, the outer thread diameter exceeds the inner diameter of the plain washer, making the assembly permanently inseparable. This eliminates loose washers on the assembly line and dramatically reduces installation time and error.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAssembly formula:\u003c\/strong\u003e GB9074.13 = GB29.2 + GB9074.24 + GB9074.26\u003c\/p\u003e\n\u003cp\u003eThe washer stack order from bolt head outward is: \u003cstrong\u003ePlain Washer → Spring Lock Washer → Bolt Head\u003c\/strong\u003e (the plain washer sits closest to the workpiece surface).\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eBenefits of Using GB9074.13 Cross Recessed Hex SEMS Screws\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e✅ \u003cstrong\u003eNo loose parts\u003c\/strong\u003e — washers are permanently captivated; no risk of dropped or missing washers during assembly\u003c\/li\u003e\n\u003cli\u003e✅ \u003cstrong\u003eFaster installation\u003c\/strong\u003e — one-piece handling replaces three separate components; ideal for automated and manual assembly lines\u003c\/li\u003e\n\u003cli\u003e✅ \u003cstrong\u003eCorrect washer sequence guaranteed\u003c\/strong\u003e — plain washer always contacts the workpiece; spring washer always contacts the bolt head flange\u003c\/li\u003e\n\u003cli\u003e✅ \u003cstrong\u003eHigh strength class 8.8\u003c\/strong\u003e — tensile strength ≥ 800 MPa; suitable for structural and load-bearing joints in machinery and automotive applications\u003c\/li\u003e\n\u003cli\u003e✅ \u003cstrong\u003eVibration resistance\u003c\/strong\u003e — the coil spring lock washer provides reliable anti-loosening performance under dynamic and cyclic loads\u003c\/li\u003e\n\u003cli\u003e✅ \u003cstrong\u003eDual drive flexibility\u003c\/strong\u003e — cross recessed (Phillips) drive on a hex head allows both manual screwdriver and power tool \/ wrench tightening\u003c\/li\u003e\n\u003cli\u003e✅ \u003cstrong\u003eRoHS-compliant Zinc Cr3 finish\u003c\/strong\u003e — trivalent chromium zinc plating replaces hexavalent Cr6+ coating; meets EU ELV, RoHS, and REACH directives; silver-grey appearance with good corrosion resistance\u003c\/li\u003e\n\u003cli\u003e✅ \u003cstrong\u003eReduced inventory complexity\u003c\/strong\u003e — one SKU replaces three separate fastener SKUs\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003eMaterial \u0026amp; Finish\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eProperty\u003c\/th\u003e\n\u003cth\u003eSpecification\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\u003eMedium Carbon Steel (quenched \u0026amp; tempered)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSurface Finish\u003c\/td\u003e\n\u003ctd\u003eZinc Cr3 (Trivalent Chromium Zinc Plating)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePlating Appearance\u003c\/td\u003e\n\u003ctd\u003eSilver-grey\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePlating Thickness\u003c\/td\u003e\n\u003ctd\u003eTypically 5–8 µm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSalt Spray Resistance\u003c\/td\u003e\n\u003ctd\u003e≥ 24 hours (white rust per ISO 9227)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProperty Class\u003c\/td\u003e\n\u003ctd\u003e8.8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTensile Strength\u003c\/td\u003e\n\u003ctd\u003e≥ 800 MPa\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYield Strength (0.2% proof)\u003c\/td\u003e\n\u003ctd\u003e≥ 640 MPa\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHardness\u003c\/td\u003e\n\u003ctd\u003e22–32 HRC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRoHS \/ ELV Compliant\u003c\/td\u003e\n\u003ctd\u003eYes — Cr3 (trivalent), no hexavalent chromium (Cr6+)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eREACH Compliant\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eZinc Cr3 vs Traditional Zinc Plating\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eProperty\u003c\/th\u003e\n\u003cth\u003eZinc Yellow (Cr6+)\u003c\/th\u003e\n\u003cth\u003eZinc Cr3 (Trivalent)\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eChromate Type\u003c\/td\u003e\n\u003ctd\u003eHexavalent Cr6+\u003c\/td\u003e\n\u003ctd\u003eTrivalent Cr3+\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRoHS Compliant\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEU ELV \/ REACH\u003c\/td\u003e\n\u003ctd\u003eRestricted\u003c\/td\u003e\n\u003ctd\u003eCompliant\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAppearance\u003c\/td\u003e\n\u003ctd\u003eYellow \/ iridescent\u003c\/td\u003e\n\u003ctd\u003eSilver-grey\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCorrosion Resistance\u003c\/td\u003e\n\u003ctd\u003eGood\u003c\/td\u003e\n\u003ctd\u003eGood (≥ 72 h salt spray)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAutomotive \/ Electronics Use\u003c\/td\u003e\n\u003ctd\u003ePhased out\u003c\/td\u003e\n\u003ctd\u003eStandard requirement\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003chr\u003e\n\u003ch2\u003eDimensions of Pre-Assembled Washers in GB9074.13 Hex Head SEMS Screws\u003c\/h2\u003e\n\u003cp\u003eWasher dimensions conform to \u003cstrong\u003eGB9074.24\u003c\/strong\u003e (plain washer) and \u003cstrong\u003eGB9074.26\u003c\/strong\u003e (spring lock washer). All dimensions in millimeters (mm).\u003c\/p\u003e\n\u003ch3\u003ePlain Washer Dimensions (GB9074.24)\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eThread Size\u003c\/th\u003e\n\u003cth\u003eInner Dia. d₁ (mm)\u003c\/th\u003e\n\u003cth\u003eOuter Dia. d₂ (mm)\u003c\/th\u003e\n\u003cth\u003eThickness h (mm)\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\u003e4.3\u003c\/td\u003e\n\u003ctd\u003e9.0\u003c\/td\u003e\n\u003ctd\u003e0.8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eM5\u003c\/td\u003e\n\u003ctd\u003e5.3\u003c\/td\u003e\n\u003ctd\u003e10.0\u003c\/td\u003e\n\u003ctd\u003e1.0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eM6\u003c\/td\u003e\n\u003ctd\u003e6.4\u003c\/td\u003e\n\u003ctd\u003e12.0\u003c\/td\u003e\n\u003ctd\u003e1.6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eM8\u003c\/td\u003e\n\u003ctd\u003e8.4\u003c\/td\u003e\n\u003ctd\u003e16.0\u003c\/td\u003e\n\u003ctd\u003e1.6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eM10\u003c\/td\u003e\n\u003ctd\u003e10.5\u003c\/td\u003e\n\u003ctd\u003e20.0\u003c\/td\u003e\n\u003ctd\u003e2.0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eSpring Lock Washer Dimensions (GB9074.26)\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eThread Size\u003c\/th\u003e\n\u003cth\u003eInner Dia. d₁ (mm)\u003c\/th\u003e\n\u003cth\u003eOuter Dia. d₂ (mm)\u003c\/th\u003e\n\u003cth\u003eThickness s (mm)\u003c\/th\u003e\n\u003cth\u003eWidth b (mm)\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\u003e4.1\u003c\/td\u003e\n\u003ctd\u003e7.1\u003c\/td\u003e\n\u003ctd\u003e0.9\u003c\/td\u003e\n\u003ctd\u003e1.5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eM5\u003c\/td\u003e\n\u003ctd\u003e5.1\u003c\/td\u003e\n\u003ctd\u003e8.7\u003c\/td\u003e\n\u003ctd\u003e1.2\u003c\/td\u003e\n\u003ctd\u003e1.8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eM6\u003c\/td\u003e\n\u003ctd\u003e6.1\u003c\/td\u003e\n\u003ctd\u003e10.2\u003c\/td\u003e\n\u003ctd\u003e1.6\u003c\/td\u003e\n\u003ctd\u003e2.0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eM8\u003c\/td\u003e\n\u003ctd\u003e8.1\u003c\/td\u003e\n\u003ctd\u003e13.0\u003c\/td\u003e\n\u003ctd\u003e2.0\u003c\/td\u003e\n\u003ctd\u003e2.5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eM10\u003c\/td\u003e\n\u003ctd\u003e10.2\u003c\/td\u003e\n\u003ctd\u003e16.2\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\u003chr\u003e\n\u003ch2\u003eDimensional Data — GB9074.13 SEMS Screw (Carbon Steel 8.8, Zinc Cr3)\u003c\/h2\u003e\n\u003cp\u003eAll dimensions in millimeters (mm). Bolt head dimensions per GB29.2. Nominal lengths per standard series.\u003c\/p\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\u003eHead Width Across Flats s (mm)\u003c\/th\u003e\n\u003cth\u003eHead Width Across Corners e (mm)\u003c\/th\u003e\n\u003cth\u003eHead Height k (mm)\u003c\/th\u003e\n\u003cth\u003eCross Recess Depth (mm)\u003c\/th\u003e\n\u003cth\u003eMin. Grip Length (mm)\u003c\/th\u003e\n\u003cth\u003eNominal Length Range L (mm)\u003c\/th\u003e\n\u003cth\u003eEst. Unit Weight (g\/pc) — @L16\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\u003c\/td\u003e\n\u003ctd\u003e7.66\u003c\/td\u003e\n\u003ctd\u003e2.8\u003c\/td\u003e\n\u003ctd\u003e1.8\u003c\/td\u003e\n\u003ctd\u003e10\u003c\/td\u003e\n\u003ctd\u003e10–40\u003c\/td\u003e\n\u003ctd\u003e≈ 1.5\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\u003c\/td\u003e\n\u003ctd\u003e8.79\u003c\/td\u003e\n\u003ctd\u003e3.5\u003c\/td\u003e\n\u003ctd\u003e2.1\u003c\/td\u003e\n\u003ctd\u003e12\u003c\/td\u003e\n\u003ctd\u003e10–50\u003c\/td\u003e\n\u003ctd\u003e≈ 2.8\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\u003c\/td\u003e\n\u003ctd\u003e11.05\u003c\/td\u003e\n\u003ctd\u003e4.0\u003c\/td\u003e\n\u003ctd\u003e2.4\u003c\/td\u003e\n\u003ctd\u003e14\u003c\/td\u003e\n\u003ctd\u003e12–60\u003c\/td\u003e\n\u003ctd\u003e≈ 4.8\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\u003c\/td\u003e\n\u003ctd\u003e14.38\u003c\/td\u003e\n\u003ctd\u003e5.3\u003c\/td\u003e\n\u003ctd\u003e3.0\u003c\/td\u003e\n\u003ctd\u003e18\u003c\/td\u003e\n\u003ctd\u003e16–80\u003c\/td\u003e\n\u003ctd\u003e≈ 10.5\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\u003e16\u003c\/td\u003e\n\u003ctd\u003e17.77\u003c\/td\u003e\n\u003ctd\u003e6.4\u003c\/td\u003e\n\u003ctd\u003e3.6\u003c\/td\u003e\n\u003ctd\u003e22\u003c\/td\u003e\n\u003ctd\u003e20–100\u003c\/td\u003e\n\u003ctd\u003e≈ 19.0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cem\u003eNote: Unit weights are approximate reference values for L=16mm. Actual weight varies with nominal length. Contact FULLERKREG for precise weight data for your specific length requirement.\u003c\/em\u003e\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eProduct Gallery\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 25%; text-align: center; padding: 8px;\"\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 25%; text-align: center; padding: 8px;\"\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 25%; text-align: center; padding: 8px;\"\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 25%; text-align: center; padding: 8px;\"\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003chr\u003e\n\u003ch2\u003eApplications\u003c\/h2\u003e\n\u003cp\u003eGB9074.13 carbon steel 8.8 Zinc Cr3 SEMS screws are widely specified in high-strength, RoHS-compliant assembly applications across automotive, machinery, and electronics industries:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e🚗 \u003cstrong\u003eAutomotive manufacturing\u003c\/strong\u003e — body panels, engine bay brackets, interior trim, sensor mounts; Zinc Cr3 meets EU ELV directive requirements\u003c\/li\u003e\n\u003cli\u003e🏭 \u003cstrong\u003eIndustrial machinery\u003c\/strong\u003e — gearbox covers, motor housings, conveyor frames, press tooling; class 8.8 handles high-torque and vibration loads\u003c\/li\u003e\n\u003cli\u003e⚡ \u003cstrong\u003eElectrical \u0026amp; power equipment\u003c\/strong\u003e — transformer enclosures, switchgear cabinets, distribution panel assembly\u003c\/li\u003e\n\u003cli\u003e🖥️ \u003cstrong\u003eElectronics \u0026amp; appliance manufacturing\u003c\/strong\u003e — chassis assembly, sheet metal enclosures, white goods; RoHS-compliant finish required\u003c\/li\u003e\n\u003cli\u003e🔧 \u003cstrong\u003eGeneral mechanical assembly\u003c\/strong\u003e — wherever pre-assembled washers eliminate loose-part handling and high clamping force is needed\u003c\/li\u003e\n\u003cli\u003e🏗️ \u003cstrong\u003eConstruction \u0026amp; structural steelwork\u003c\/strong\u003e — secondary steel connections, bracket assemblies, equipment mounting in indoor environments\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003eWhy Choose FULLERKREG GB9074.13 Steel 8.8 Zinc Cr3 SEMS Screws?\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e🏭 \u003cstrong\u003eDirect manufacturer\u003c\/strong\u003e — produced in-house to GB\/T 9074.13-1988 standard with full dimensional traceability\u003c\/li\u003e\n\u003cli\u003e📦 \u003cstrong\u003eBulk wholesale supply\u003c\/strong\u003e — flexible MOQ, competitive pricing for OEM and MRO procurement\u003c\/li\u003e\n\u003cli\u003e📐 \u003cstrong\u003eStrict dimensional control\u003c\/strong\u003e — 100% thread gauge inspection; washer captivation verified per standard\u003c\/li\u003e\n\u003cli\u003e📋 \u003cstrong\u003eCompliance documentation available\u003c\/strong\u003e — material test reports, RoHS certificates, and REACH declarations on request\u003c\/li\u003e\n\u003cli\u003e🚀 \u003cstrong\u003eFast lead times\u003c\/strong\u003e — standard sizes held in stock; custom lengths available with short lead times\u003c\/li\u003e\n\u003cli\u003e🌍 \u003cstrong\u003eGlobal export experience\u003c\/strong\u003e — export packaging, ISPM-15 compliant crating, and international logistics support\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003cp\u003e\u003cstrong\u003eStandard:\u003c\/strong\u003e GB\/T 9074.13-1988 | \u003cstrong\u003eMaterial:\u003c\/strong\u003e Carbon Steel | \u003cstrong\u003eFinish:\u003c\/strong\u003e Zinc Cr3 (Trivalent Zinc) | \u003cstrong\u003eProperty Class:\u003c\/strong\u003e 8.8 | \u003cstrong\u003eBrand:\u003c\/strong\u003e FULLERKREG\u003c\/p\u003e","products":[],"url":"https:\/\/www.fullerkr.com\/collections\/gb9074-13-8-8.oembed","provider":"Fullerkreg Fasteners","version":"1.0","type":"link"}