{"title":"GB9074.4-1988 Phillips Pan Head SEMS Screws - Alloy Steel (8.8) - Zinc Cr3","description":"\u003ch1\u003eGB9074.4-1988 Phillips Pan Head SEMS Screws – Alloy Steel (Class 8.8) – Zinc Cr3\u003c\/h1\u003e\n\n\u003cp\u003eFULLERKREG supplies GB9074.4-1988 Phillips pan head SEMS screws manufactured from alloy steel 10B21, heat-treated to strength class 8.8, with a trivalent chromate (Zinc Cr3) surface finish. Each screw ships with a pre-assembled flat washer (GB9074.24 \/ DIN 125A) and a spring washer (GB9074.26), permanently captivated on the shank — eliminating loose washer handling on the assembly line.\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eWhat are Phillips Pan Head SEMS Screws?\u003c\/h2\u003e\n\n\u003cp\u003eSEMS screws (also called combination screws or pre-assembled screws) are fasteners in which one or more washers are permanently captured on the screw shank before threading. The washer(s) are assembled onto the blank shank and then the thread is rolled, making the outer diameter of the thread larger than the inner diameter of the washer — so the washer can never fall off.\u003c\/p\u003e\n\n\u003cp\u003eGB9074.4-1988 defines the Chinese national standard for \u003cstrong\u003ecross-recessed (Phillips) pan head combination screws\u003c\/strong\u003e with pre-assembled spring washer and plain washer. The assembly is expressed as:\u003c\/p\u003e\n\n\u003cp style=\"text-align:center;\"\u003e\u003cstrong\u003eGB9074.4 = GB818 (Pan Head Screw) + GB9074.24 (Plain Washer) + GB9074.26 (Spring Washer)\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThe pan head profile provides a broad, low-profile bearing surface for load distribution. The Phillips (cross-recessed) drive enables fast, reliable torquing with standard power tools in automated assembly environments.\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eBenefits of Using Phillips Pan Head SEMS Screws\u003c\/h2\u003e\n\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eEliminates loose washer handling\u003c\/strong\u003e — washers are permanently captivated; no separate picking, placing, or alignment required.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFaster assembly\u003c\/strong\u003e — one part replaces three; dramatically reduces cycle time in high-volume production.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eReduced risk of missing washers\u003c\/strong\u003e — captive design prevents washer omission errors that cause field failures.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSpace-saving installation\u003c\/strong\u003e — the shortened unthreaded shank (compared to standard SEMS) allows clamping of thinner panels; minimum clampable thickness is approximately half that of standard combination screws.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompatible with legacy JIS washer dimensions\u003c\/strong\u003e — flat washer and spring washer conform to JIS\/DIN 125 dimensions, ensuring drop-in compatibility with existing designs.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSuitable for automated feeding\u003c\/strong\u003e — consistent geometry and captive washers make these screws ideal for vibratory bowl feeders and robotic assembly.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAnti-loosening\u003c\/strong\u003e — the spring washer provides continuous axial load to resist vibration-induced loosening.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eMaterial \u0026amp; Finish\u003c\/h2\u003e\n\n\u003ctable border=\"1\" cellpadding=\"6\" cellspacing=\"0\" style=\"border-collapse:collapse;width:100%;max-width:600px;\"\u003e\n  \u003cthead\u003e\n    \u003ctr style=\"background-color:#f2f2f2;\"\u003e\n      \u003cth style=\"text-align:left;\"\u003eComponent\u003c\/th\u003e\n      \u003cth style=\"text-align:left;\"\u003eMaterial\u003c\/th\u003e\n      \u003cth style=\"text-align:left;\"\u003eSurface Treatment\u003c\/th\u003e\n      \u003cth style=\"text-align:left;\"\u003eStrength \/ Grade\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\u003eAlloy Steel 10B21\u003c\/td\u003e\n      \u003ctd\u003eZinc Cr3 (Trivalent Chromate)\u003c\/td\u003e\n      \u003ctd\u003eClass 8.8\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003ePlain Washer (Flat)\u003c\/td\u003e\n      \u003ctd\u003eSWRH62 \/ Low Carbon Steel\u003c\/td\u003e\n      \u003ctd\u003eZinc Cr3 (Trivalent Chromate)\u003c\/td\u003e\n      \u003ctd\u003e—\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eSpring Washer\u003c\/td\u003e\n      \u003ctd\u003eSPCC \/ Carbon Steel\u003c\/td\u003e\n      \u003ctd\u003eZinc Cr3 (Trivalent Chromate)\u003c\/td\u003e\n      \u003ctd\u003e—\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cp\u003e\u003cstrong\u003eZinc Cr3\u003c\/strong\u003e (trivalent chromate \/ RoHS-compliant zinc plating) provides excellent corrosion resistance while meeting environmental regulations. Typical salt-spray resistance: ≥ 72 hours to white rust.\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eDimensional Data – GB9074.4-1988 Phillips Pan Head SEMS Screws\u003c\/h2\u003e\n\n\u003cp\u003eThread range: \u003cstrong\u003eM3 – M8\u003c\/strong\u003e  |  Length range: \u003cstrong\u003e5 mm – 50 mm\u003c\/strong\u003e  |  Drive: Phillips (Cross Recessed, Type H)\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:#f2f2f2;\"\u003e\n      \u003cth\u003eThread (d)\u003c\/th\u003e\n      \u003cth\u003ePitch (mm)\u003c\/th\u003e\n      \u003cth\u003eHead Dia. dk (mm)\u003c\/th\u003e\n      \u003cth\u003eHead Height k (mm)\u003c\/th\u003e\n      \u003cth\u003eDrive No.\u003c\/th\u003e\n      \u003cth\u003eMin. Clamp Thickness (mm)\u003c\/th\u003e\n      \u003cth\u003eMax. Clamp Thickness (mm)\u003c\/th\u003e\n      \u003cth\u003eUnit Weight (g\/100 pcs)*\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\u003e5.6\u003c\/td\u003e\n\u003ctd\u003e2.0\u003c\/td\u003e\n\u003ctd\u003ePH1\u003c\/td\u003e\n\u003ctd\u003e0.5\u003c\/td\u003e\n\u003ctd\u003evaries by length\u003c\/td\u003e\n\u003ctd\u003e~38\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\u003e8.0\u003c\/td\u003e\n\u003ctd\u003e2.6\u003c\/td\u003e\n\u003ctd\u003ePH2\u003c\/td\u003e\n\u003ctd\u003e0.6\u003c\/td\u003e\n\u003ctd\u003evaries by length\u003c\/td\u003e\n\u003ctd\u003e~95\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\u003e9.5\u003c\/td\u003e\n\u003ctd\u003e3.3\u003c\/td\u003e\n\u003ctd\u003ePH2\u003c\/td\u003e\n\u003ctd\u003e0.8\u003c\/td\u003e\n\u003ctd\u003evaries by length\u003c\/td\u003e\n\u003ctd\u003e~185\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\u003e12.0\u003c\/td\u003e\n\u003ctd\u003e3.9\u003c\/td\u003e\n\u003ctd\u003ePH3\u003c\/td\u003e\n\u003ctd\u003e1.0\u003c\/td\u003e\n\u003ctd\u003evaries by length\u003c\/td\u003e\n\u003ctd\u003e~320\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\u003e16.0\u003c\/td\u003e\n\u003ctd\u003e5.0\u003c\/td\u003e\n\u003ctd\u003ePH4\u003c\/td\u003e\n\u003ctd\u003e1.2\u003c\/td\u003e\n\u003ctd\u003evaries by length\u003c\/td\u003e\n\u003ctd\u003e~750\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cp style=\"font-size:12px;\"\u003e* Unit weight is approximate for a representative length (e.g., 16 mm). Actual weight varies by length. Contact FULLERKREG for exact weight data per SKU.\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eDimensions of Pre-Assembled Washers\u003c\/h2\u003e\n\n\u003cp\u003eThe flat washer conforms to \u003cstrong\u003eDIN 125A\u003c\/strong\u003e dimensions. The spring washer conforms to \u003cstrong\u003eGB9074.26\u003c\/strong\u003e (equivalent to DIN 127B). Both washers are permanently captivated on the screw shank.\u003c\/p\u003e\n\n\u003ch3\u003eFlat Washer Dimensions (DIN 125A \/ GB9074.24)\u003c\/h3\u003e\n\n\u003ctable border=\"1\" cellpadding=\"6\" cellspacing=\"0\" style=\"border-collapse:collapse;width:100%;max-width:600px;font-size:13px;\"\u003e\n  \u003cthead\u003e\n    \u003ctr style=\"background-color:#f2f2f2;\"\u003e\n      \u003cth\u003eThread (d)\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\u003eM3\u003c\/td\u003e\n\u003ctd\u003e3.2\u003c\/td\u003e\n\u003ctd\u003e7.0\u003c\/td\u003e\n\u003ctd\u003e0.5\u003c\/td\u003e\n\u003c\/tr\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  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eSpring Washer Dimensions (GB9074.26 \/ DIN 127B)\u003c\/h3\u003e\n\n\u003ctable border=\"1\" cellpadding=\"6\" cellspacing=\"0\" style=\"border-collapse:collapse;width:100%;max-width:600px;font-size:13px;\"\u003e\n  \u003cthead\u003e\n    \u003ctr style=\"background-color:#f2f2f2;\"\u003e\n      \u003cth\u003eThread (d)\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\u003eHeight h (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\u003e3.1\u003c\/td\u003e\n\u003ctd\u003e5.1\u003c\/td\u003e\n\u003ctd\u003e0.8\u003c\/td\u003e\n\u003ctd\u003e1.6\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM4\u003c\/td\u003e\n\u003ctd\u003e4.1\u003c\/td\u003e\n\u003ctd\u003e6.8\u003c\/td\u003e\n\u003ctd\u003e0.9\u003c\/td\u003e\n\u003ctd\u003e1.8\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\u003e8.2\u003c\/td\u003e\n\u003ctd\u003e1.2\u003c\/td\u003e\n\u003ctd\u003e2.4\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\u003e9.9\u003c\/td\u003e\n\u003ctd\u003e1.6\u003c\/td\u003e\n\u003ctd\u003e3.2\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\u003e4.0\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eProduct Images\u003c\/h2\u003e\n\n\u003ctable border=\"0\" cellpadding=\"8\" cellspacing=\"0\" style=\"width:100%;\"\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"width:25%;text-align:center;vertical-align:top;\"\u003e[Image 1]\u003c\/td\u003e\n      \u003ctd style=\"width:25%;text-align:center;vertical-align:top;\"\u003e[Image 2]\u003c\/td\u003e\n      \u003ctd style=\"width:25%;text-align:center;vertical-align:top;\"\u003e[Image 3]\u003c\/td\u003e\n      \u003ctd style=\"width:25%;text-align:center;vertical-align:top;\"\u003e[Image 4]\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eApplications\u003c\/h2\u003e\n\n\u003cp\u003eGB9074.4-1988 Phillips pan head SEMS screws are widely used wherever fast, reliable, and washer-retaining fastening is required:\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eConsumer electronics \u0026amp; exterior panels\u003c\/strong\u003e — thin sheet metal enclosures, decorative faceplates, and display housings\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSemiconductor \u0026amp; precision equipment\u003c\/strong\u003e — cleanroom-compatible assembly with controlled torque and no loose particles\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStructural assemblies\u003c\/strong\u003e — equipment frames, mounting brackets, and structural sheet metal\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMarine \u0026amp; outdoor equipment\u003c\/strong\u003e — Zinc Cr3 coating provides corrosion resistance in humid and salt-spray environments\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eGeneral industrial machinery\u003c\/strong\u003e — covers, guards, access panels, and junction boxes\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAutomated assembly lines\u003c\/strong\u003e — captive washer design is ideal for robotic and vibratory-feed assembly\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eParticularly suited for applications where \u003cstrong\u003epanel thickness is limited\u003c\/strong\u003e — the shortened unthreaded shank allows clamping of panels as thin as approximately half the minimum thickness achievable with standard combination screws. Refer to the dimensional table for minimum clampable thickness per size.\u003c\/p\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 — full control over material sourcing, heat treatment, and surface finishing\u003c\/li\u003e\n  \u003cli\u003e📐 \u003cstrong\u003eStandard-compliant\u003c\/strong\u003e — manufactured and inspected to GB9074.4-1988 with full dimensional traceability\u003c\/li\u003e\n  \u003cli\u003e🌍 \u003cstrong\u003eGlobal supply\u003c\/strong\u003e — export packaging, English documentation, and worldwide logistics support\u003c\/li\u003e\n  \u003cli\u003e📦 \u003cstrong\u003eBulk \u0026amp; wholesale ready\u003c\/strong\u003e — available in bulk bags, boxes, or custom packaging for OEM customers\u003c\/li\u003e\n  \u003cli\u003e🔬 \u003cstrong\u003eQuality assured\u003c\/strong\u003e — incoming material certification, hardness testing, and salt-spray testing available on request\u003c\/li\u003e\n  \u003cli\u003e💬 \u003cstrong\u003eEngineering support\u003c\/strong\u003e — custom sizes, materials, and special specifications available; contact our technical team\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eFor custom specifications, non-standard sizes, or volume pricing, please contact the FULLERKREG team directly.\u003c\/p\u003e","products":[],"url":"https:\/\/www.fullerkr.com\/collections\/gb9074-4-1988-phillips-pan-head-sems-screws-alloy-steel-8-8-zinc-cr3.oembed","provider":"Fullerkreg Fasteners","version":"1.0","type":"link"}