{"title":"GB9074.4-1988 Phillips Pan Head SEMS Screws - Stainless Steel (A2)","description":"\u003ch1\u003eGB9074.4-1988 Phillips Pan Head SEMS Screws – Stainless Steel A2 (SUS304) – A2-70\u003c\/h1\u003e\n\n\u003cp\u003eFULLERKREG supplies GB9074.4-1988 Phillips pan head SEMS screws manufactured from austenitic stainless steel A2 (SUS304 \/ 18-8), with a bright-pickled and passivated 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 while delivering outstanding corrosion resistance.\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 both manual and 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\u003eSuperior corrosion resistance\u003c\/strong\u003e — A2 stainless steel (SUS304) provides excellent resistance to atmospheric corrosion, moisture, and mild chemicals without any surface coating.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNon-magnetic \u0026amp; hygienic\u003c\/strong\u003e — austenitic stainless steel is non-magnetic and easy to clean, making it suitable for food processing, medical, and cleanroom environments.\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 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\u003eNo coating delamination risk\u003c\/strong\u003e — unlike zinc-plated steel, stainless steel requires no surface coating, eliminating the risk of plating flaking or peeling in service.\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:680px;\"\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;\"\u003eSteel Grade\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\u003eStainless Steel A2 (SUS304 \/ 18-8)\u003c\/td\u003e\n      \u003ctd\u003eAISI 304\u003c\/td\u003e\n      \u003ctd\u003eBright Pickled \u0026amp; Passivated\u003c\/td\u003e\n      \u003ctd\u003eA2-70\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003ePlain Washer (Flat)\u003c\/td\u003e\n      \u003ctd\u003eStainless Steel A2 (SUS304)\u003c\/td\u003e\n      \u003ctd\u003eAISI 304\u003c\/td\u003e\n      \u003ctd\u003eBright Pickled \u0026amp; Passivated\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\u003eStainless Steel A2 (SUS304)\u003c\/td\u003e\n      \u003ctd\u003eAISI 304\u003c\/td\u003e\n      \u003ctd\u003eBright Pickled \u0026amp; Passivated\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\u003eA2-70\u003c\/strong\u003e denotes austenitic stainless steel (A2) with a minimum tensile strength of 700 MPa. The bright-pickled and passivated finish removes surface oxides and iron contamination from the manufacturing process, restoring the natural chromium oxide passive layer for maximum corrosion resistance — with no additional coating required. Typical salt-spray resistance: ≥ 200 hours to red rust.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eKey mechanical properties (A2-70):\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eTensile strength: ≥ 700 MPa\u003c\/li\u003e\n  \u003cli\u003e0.2% proof stress: ≥ 450 MPa\u003c\/li\u003e\n  \u003cli\u003eElongation: ≥ 20%\u003c\/li\u003e\n  \u003cli\u003eHardness: ≤ 220 HV\u003c\/li\u003e\n\u003c\/ul\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~40\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~100\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~195\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~335\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~790\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). Stainless steel density ~7.93 g\/cm³. 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. All washer components are stainless steel A2 (SUS304), matching the screw body material for full galvanic compatibility. 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 optimized for the SEMS captive assembly process and are slightly smaller than DIN 125A equivalents.\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 stainless steel A2 (SUS304) \/ A2-70 are the preferred choice wherever corrosion resistance, hygiene, or aesthetic appearance is critical:\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFood processing \u0026amp; catering equipment\u003c\/strong\u003e — stainless steel is FDA-compatible and easy to clean; ideal for food contact surfaces, processing machinery, and commercial kitchen equipment\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMarine \u0026amp; coastal environments\u003c\/strong\u003e — A2 stainless steel withstands salt spray and humid marine atmospheres without rusting or staining\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMedical \u0026amp; laboratory equipment\u003c\/strong\u003e — non-magnetic, non-porous, and easy to sterilize; suitable for medical device assembly and laboratory instrument housings\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSemiconductor \u0026amp; cleanroom equipment\u003c\/strong\u003e — no coating particles or outgassing; captive washer design prevents loose particle contamination\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOutdoor \u0026amp; architectural applications\u003c\/strong\u003e — façade panels, signage, handrails, and outdoor enclosures where long-term appearance is required\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eElectronics \u0026amp; precision instruments\u003c\/strong\u003e — thin panel fastening with controlled torque and no risk of coating contamination on sensitive components\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eChemical \u0026amp; pharmaceutical plant\u003c\/strong\u003e — resistance to mild acids, alkalis, and cleaning agents used in process 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\u003c\/ul\u003e\n\n\u003cp\u003eParticularly suited for applications where \u003cstrong\u003elong-term corrosion resistance without maintenance\u003c\/strong\u003e is required, and where the use of zinc-plated or coated fasteners would be inappropriate due to hygiene, aesthetic, or environmental requirements.\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, cold forming, and passivation treatment\u003c\/li\u003e\n  \u003cli\u003e📐 \u003cstrong\u003eStandard-compliant\u003c\/strong\u003e — manufactured and inspected to GB9074.4-1988 with full dimensional and material traceability\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eMaterial certification\u003c\/strong\u003e — mill test certificates (MTC) for SUS304 \/ A2 stainless steel available on request\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, A4 (SUS316) upgrades, and special specifications available; contact our technical team\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eFor custom specifications, non-standard sizes, A4 stainless steel options, 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-stainless-steel-a2.oembed","provider":"Fullerkreg Fasteners","version":"1.0","type":"link"}