{"title":"GB9074.4-1988 Phillips Pan Head SEMS Screws - Steel (4.8) - Bright Zinc Plated","description":"\u003ch1\u003eGB9074.4-1988 Phillips Pan Head SEMS Screws – Steel (Class 4.8) – Bright Zinc Plated\u003c\/h1\u003e\n\n\u003cp\u003eFULLERKREG supplies GB9074.4-1988 Phillips pan head SEMS screws manufactured from low carbon steel A3, heat-treated to strength class 4.8, with a bright zinc plated surface finish. Each screw ships with a pre-assembled flat washer (GB9074.24) 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 during handling or installation.\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 excellent load distribution across the clamped material. The Phillips (cross-recessed) drive enables fast, reliable torquing with standard power tools and is well-suited to 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 during assembly.\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 lines.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eReduced risk of missing washers\u003c\/strong\u003e — captive design prevents washer omission errors that can cause field failures or warranty claims.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSpace-saving installation\u003c\/strong\u003e — the shortened unthreaded shank 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 GB9074.24 \/ JIS 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 systems.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAnti-loosening\u003c\/strong\u003e — the pre-assembled spring washer provides continuous axial load to resist vibration-induced loosening in service.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCost-effective general fastening\u003c\/strong\u003e — class 4.8 low carbon steel with bright zinc plating offers an economical solution for non-critical structural and panel fastening applications.\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:640px;\"\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\u003eLow Carbon Steel A3\u003c\/td\u003e\n      \u003ctd\u003eBright Zinc Plated\u003c\/td\u003e\n      \u003ctd\u003eClass 4.8\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003ePlain Washer (Flat)\u003c\/td\u003e\n      \u003ctd\u003eLow Carbon Steel\u003c\/td\u003e\n      \u003ctd\u003eBright Zinc Plated\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\u003eCarbon Steel\u003c\/td\u003e\n      \u003ctd\u003eBright Zinc Plated\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\u003eBright Zinc Plating\u003c\/strong\u003e provides a clean, shiny metallic appearance with good corrosion resistance for indoor and light outdoor applications. Typical salt-spray resistance: ≥ 48 hours to white rust. Suitable for general industrial and consumer product assembly where a cost-effective finish is required.\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\u003eGB9074.24\u003c\/strong\u003e dimensions. The spring washer conforms to \u003cstrong\u003eGB9074.26\u003c\/strong\u003e. Both washers are permanently captivated on the screw shank prior to shipment.\u003c\/p\u003e\n\n\u003ch3\u003eFlat Washer Dimensions (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\u003e6.0\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\u003e8.0\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\u003e9.0\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\u003e11.0\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\u003e15.0\u003c\/td\u003e\n\u003ctd\u003e1.6\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cp style=\"font-size:12px;\"\u003eNote: GB9074.24 plain washer outer diameters are slightly smaller than DIN 125A equivalents, optimized for the SEMS captive assembly process.\u003c\/p\u003e\n\n\u003ch3\u003eSpring Washer Dimensions (GB9074.26)\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 in class 4.8 \/ bright zinc plated are widely used in cost-sensitive, general-purpose fastening applications:\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eConsumer electronics \u0026amp; appliance panels\u003c\/strong\u003e — thin sheet metal enclosures, decorative faceplates, and access covers where a clean bright finish is desired\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFurniture \u0026amp; fixture assembly\u003c\/strong\u003e — flat-pack furniture, shelving units, and retail display fixtures requiring fast, reliable fastening\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStructural assemblies\u003c\/strong\u003e — equipment frames, mounting brackets, and general sheet metal fabrication\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHVAC \u0026amp; ductwork\u003c\/strong\u003e — duct panels, air handling unit covers, and ventilation equipment housings\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eGeneral industrial machinery\u003c\/strong\u003e — guards, covers, access panels, and junction boxes in light-duty industrial environments\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, reducing part count and handling errors\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLighting \u0026amp; electrical enclosures\u003c\/strong\u003e — panel boards, distribution boxes, and light fixture mounting where a bright finish complements the product aesthetic\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eParticularly suited for applications where \u003cstrong\u003epanel thickness is limited\u003c\/strong\u003e and an economical fastening solution is required. The class 4.8 strength grade is appropriate for light-to-medium clamping loads in non-safety-critical assemblies. 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 and MRO 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 for non-standard requirements\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-steel-4-8-bright-zinc-plated.oembed","provider":"Fullerkreg Fasteners","version":"1.0","type":"link"}