{"title":"M-Type Double Washer Socket Cap Head SEMS Screws - High Tensile Stainless Steel (A2-70)","description":"\u003ch1\u003eM-Type Double Washer Socket Cap Head SEMS Screws – High Tensile Stainless Steel (A2-70)\u003c\/h1\u003e\n\n\u003cp\u003eFULLERKREG M-Type Double Washer Socket Cap Head SEMS Screws integrate an ISO 4762 hex socket cap head screw with two permanently captivated washers — a \u003cstrong\u003eDIN 433 small outer diameter flat washer\u003c\/strong\u003e and a \u003cstrong\u003elock washer\u003c\/strong\u003e — assembled onto the shank by thread rolling. The compact DIN 433 small washer is specifically designed for confined spaces, closely spaced hole patterns, and applications where a reduced washer footprint is required without sacrificing the anti-loosening benefit of a lock washer. Available in A2-70 (SUS304) stainless steel with passivated finish, these screws eliminate loose washer handling and deliver reliable fastening in space-constrained industrial environments.\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\u003eM-Type Double Washer\u003c\/strong\u003e configuration pairs a \u003cstrong\u003eDIN 433 small-series flat washer\u003c\/strong\u003e with a \u003cstrong\u003elock washer\u003c\/strong\u003e. DIN 433 specifies a reduced outer diameter compared to ISO standard washers, making the M-Type the preferred choice where clearance around the fastener is limited or where a low-profile washer footprint is required. 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 M2 to M10 thread sizes.\u003c\/p\u003e\n\n\u003cp\u003eThis design is especially beneficial in electronics assembly, precision instruments, compact machinery, and any application where tight hole spacing or confined access makes a standard or large washer impractical.\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\u003eCompact washer footprint\u003c\/strong\u003e — the DIN 433 small washer outer diameter is smaller than ISO standard, enabling use in confined spaces, tight hole patterns, and applications with limited clearance around the fastener.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eEliminates loose washers\u003c\/strong\u003e — the DIN 433 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 + small washer + lock washer), reducing cycle time and operator handling steps.\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\u003eImproved vibration resistance\u003c\/strong\u003e — the integrated lock washer provides reliable anti-loosening performance without additional components or thread-locking compounds.\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  \u003cli\u003e\n\u003cstrong\u003eLow-profile assembly\u003c\/strong\u003e — the small washer diameter minimises the overall fastener footprint, ideal for aesthetic or space-critical applications.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCorrosion resistance\u003c\/strong\u003e — A2-70 (SUS304) stainless steel with passivated finish provides excellent resistance to oxidation, moisture, and mild chemical environments.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRoHS and REACH compliant\u003c\/strong\u003e — all finishes meet environmental compliance requirements for global markets.\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\u003eReduced bearing area\u003c\/strong\u003e — the DIN 433 small washer outer diameter is smaller than ISO standard or DIN 9021 large washers; not suitable for soft substrates or oversized holes where load spreading is critical.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFixed washer configuration\u003c\/strong\u003e — the DIN 433 washer type and size are determined at manufacture; they cannot be changed or substituted in the field.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHigher unit cost\u003c\/strong\u003e — SEMS screws carry a premium over equivalent loose-component assemblies due to the additional manufacturing step.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMinimum plate thickness requirement\u003c\/strong\u003e — the captive washer stack height must be considered when selecting screw length for thin sheet metal applications.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNot suitable for all joint configurations\u003c\/strong\u003e — applications requiring standard, large, or specialty washers must use separate components or alternative SEMS types.\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\u003eStainless Steel (SUS304 \/ A2)\u003c\/td\u003e\n      \u003ctd\u003eA2-70\u003c\/td\u003e\n      \u003ctd\u003ePassivated (Natural)\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"background-color:#f5f5f5;\"\u003e\n      \u003ctd\u003eSmall Flat Washer (DIN 433)\u003c\/td\u003e\n      \u003ctd\u003eStainless Steel (SUS304)\u003c\/td\u003e\n      \u003ctd\u003eDIN 433\u003c\/td\u003e\n      \u003ctd\u003ePassivated\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eLock Washer\u003c\/td\u003e\n      \u003ctd\u003eStainless Steel (SUS304)\u003c\/td\u003e\n      \u003ctd\u003eISO Standard\u003c\/td\u003e\n      \u003ctd\u003ePassivated\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cp\u003e\u003cstrong\u003eFinish Options:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003e0 – Natural:\u003c\/strong\u003e As-manufactured, no additional surface treatment.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e1 – Passivated:\u003c\/strong\u003e Electrochemical passivation to enhance corrosion resistance and remove free iron from the surface.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e2 – Stayblack:\u003c\/strong\u003e Black oxide finish for aesthetic and mild corrosion protection.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cem\u003eAll finishes are RoHS and REACH compliant.\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 M-Type configuration uses \u003cstrong\u003eDIN 433 small outer diameter flat washers\u003c\/strong\u003e. DIN 433 specifies a reduced outer diameter compared to ISO standard (DIN 125A) washers, providing a compact bearing surface suited to confined-space applications. The following table shows the inner diameter (d1), outer diameter (d2), and thickness (t) of the captive DIN 433 flat washers by thread size:\u003c\/p\u003e\n\n\u003ch3\u003eDIN 433 Small Plain Washer (M-Type – used in M-Type SEMS)\u003c\/h3\u003e\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\u003eM2\u003c\/th\u003e\n      \u003cth\u003eM2.5\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    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n      \u003ctd\u003e\u003cstrong\u003ed1 – Inner Diameter (mm)\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd\u003e2.2\u003c\/td\u003e\n      \u003ctd\u003e2.7\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    \u003c\/tr\u003e\n    \u003ctr style=\"background-color:#f5f5f5;\"\u003e\n      \u003ctd\u003e\u003cstrong\u003ed2 – Outside Diameter (mm)\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd\u003e4.5\u003c\/td\u003e\n      \u003ctd\u003e5.0\u003c\/td\u003e\n      \u003ctd\u003e6.0\u003c\/td\u003e\n      \u003ctd\u003e8.0\u003c\/td\u003e\n      \u003ctd\u003e9.0\u003c\/td\u003e\n      \u003ctd\u003e11.0\u003c\/td\u003e\n      \u003ctd\u003e15.0\u003c\/td\u003e\n      \u003ctd\u003e18.0\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\u003e0.3\u003c\/td\u003e\n      \u003ctd\u003e0.5\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    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cp style=\"font-size:12px;\"\u003eAll dimensions per DIN 433 standard. All dimensions in mm.\u003c\/p\u003e\n\n\u003ch3\u003eWasher Size Comparison: DIN 433 (M-Type) vs. ISO Standard (S-Type) vs. DIN 9021 (L-Type)\u003c\/h3\u003e\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\u003eDIN 433 OD – M-Type (mm)\u003c\/th\u003e\n      \u003cth\u003eISO Std OD – S-Type (mm)\u003c\/th\u003e\n      \u003cth\u003eDIN 9021 OD – L-Type (mm)\u003c\/th\u003e\n      \u003cth\u003eM-Type vs. S-Type\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\u003e6.0\u003c\/td\u003e\n      \u003ctd\u003e7.0\u003c\/td\u003e\n      \u003ctd\u003e9.0\u003c\/td\u003e\n      \u003ctd\u003e−14% smaller\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"background-color:#f5f5f5;\"\u003e\n      \u003ctd\u003eM4\u003c\/td\u003e\n      \u003ctd\u003e8.0\u003c\/td\u003e\n      \u003ctd\u003e9.0\u003c\/td\u003e\n      \u003ctd\u003e12.0\u003c\/td\u003e\n      \u003ctd\u003e−11% smaller\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eM5\u003c\/td\u003e\n      \u003ctd\u003e9.0\u003c\/td\u003e\n      \u003ctd\u003e10.0\u003c\/td\u003e\n      \u003ctd\u003e15.0\u003c\/td\u003e\n      \u003ctd\u003e−10% smaller\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"background-color:#f5f5f5;\"\u003e\n      \u003ctd\u003eM6\u003c\/td\u003e\n      \u003ctd\u003e11.0\u003c\/td\u003e\n      \u003ctd\u003e12.5\u003c\/td\u003e\n      \u003ctd\u003e18.0\u003c\/td\u003e\n      \u003ctd\u003e−12% smaller\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eM8\u003c\/td\u003e\n      \u003ctd\u003e15.0\u003c\/td\u003e\n      \u003ctd\u003e17.0\u003c\/td\u003e\n      \u003ctd\u003e24.0\u003c\/td\u003e\n      \u003ctd\u003e−12% smaller\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"background-color:#f5f5f5;\"\u003e\n      \u003ctd\u003eM10\u003c\/td\u003e\n      \u003ctd\u003e18.0\u003c\/td\u003e\n      \u003ctd\u003e21.0\u003c\/td\u003e\n      \u003ctd\u003e30.0\u003c\/td\u003e\n      \u003ctd\u003e−14% smaller\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eDimensional Data – Metric Series (ISO 4762 Head, A2-70)\u003c\/h2\u003e\n\n\u003cp\u003eAll dimensions in mm. Head dimensions conform to \u003cstrong\u003eISO 4762\u003c\/strong\u003e. Thread rolled to \u003cstrong\u003eBS 3643\u003c\/strong\u003e, Class 6g. Washer diameter column (D) reflects the DIN 433 small 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\u003ePart Number\u003c\/th\u003e\n      \u003cth\u003eThread (Class 6g)\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) ②\u003c\/th\u003e\n      \u003cth\u003eF – ① (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\u003e115-04(X)-020-(XX)\u003c\/td\u003e\n      \u003ctd\u003eM2 × 0.4\u003c\/td\u003e\n      \u003ctd\u003e3.8\u003c\/td\u003e\n      \u003ctd\u003e2.0\u003c\/td\u003e\n      \u003ctd\u003e1.5\u003c\/td\u003e\n      \u003ctd\u003e4.5\u003c\/td\u003e\n      \u003ctd\u003e—\u003c\/td\u003e\n      \u003ctd\u003e2.4\u003c\/td\u003e\n      \u003ctd\u003e—\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"background-color:#f5f5f5;\"\u003e\n      \u003ctd\u003e115-04(X)-025-(XX)\u003c\/td\u003e\n      \u003ctd\u003eM2.5 × 0.45\u003c\/td\u003e\n      \u003ctd\u003e4.5\u003c\/td\u003e\n      \u003ctd\u003e2.5\u003c\/td\u003e\n      \u003ctd\u003e2.0\u003c\/td\u003e\n      \u003ctd\u003e5.0\u003c\/td\u003e\n      \u003ctd\u003e—\u003c\/td\u003e\n      \u003ctd\u003e2.8\u003c\/td\u003e\n      \u003ctd\u003e—\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003e115-04(X)-030-(XX)\u003c\/td\u003e\n      \u003ctd\u003eM3 × 0.5\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\u003e6.0\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\u003e115-04(X)-040-(XX)\u003c\/td\u003e\n      \u003ctd\u003eM4 × 0.7\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\u003e8.0\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\u003e115-04(X)-050-(XX)\u003c\/td\u003e\n      \u003ctd\u003eM5 × 0.8\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\u003e9.0\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\u003e115-04(X)-060-(XX)\u003c\/td\u003e\n      \u003ctd\u003eM6 × 1.0\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\u003e11.0\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\u003e115-04(X)-080-(XX)\u003c\/td\u003e\n      \u003ctd\u003eM8 × 1.25\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\u003e15.0\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\u003e115-04(X)-100-(XX)\u003c\/td\u003e\n      \u003ctd\u003eM10 × 1.5\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\u003e18.0\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  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cp style=\"font-size:12px;\"\u003e① Distance before full thread starts.   ② Washers in compressed state (to be confirmed per size).   All dimensions in mm.\u003cbr\u003eUnit Weight (g): to be updated. Contact FULLERKREG for weight data sheets.\u003cbr\u003eD column reflects DIN 433 small washer outer diameter. Head dimensions per ISO 4762.\u003c\/p\u003e\n\n\u003ch3\u003ePart Number Call-Out Guide\u003c\/h3\u003e\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\u003ePosition\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\u003eSEMS Series\u003c\/td\u003e\n      \u003ctd\u003e115-04X\u003c\/td\u003e\n      \u003ctd\u003eMetric series with DIN 433 small flat washer + lock washer (M-Type double washer)\u003c\/td\u003e\n      \u003ctd\u003e115-041 = Hex socket, DIN 433 small washer + lock washer\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"background-color:#f5f5f5;\"\u003e\n      \u003ctd\u003eFinish Code\u003c\/td\u003e\n      \u003ctd\u003e1 digit\u003c\/td\u003e\n      \u003ctd\u003e0 = Natural, 1 = Passivated, 2 = Stayblack\u003c\/td\u003e\n      \u003ctd\u003e1 = Passivated\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eThread Code\u003c\/td\u003e\n      \u003ctd\u003e3 digits\u003c\/td\u003e\n      \u003ctd\u003eThread size code (see table)\u003c\/td\u003e\n      \u003ctd\u003e060 = M6\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"background-color:#f5f5f5;\"\u003e\n      \u003ctd\u003eUnderhead Length\u003c\/td\u003e\n      \u003ctd\u003e2 digits\u003c\/td\u003e\n      \u003ctd\u003eLength in mm under head (L ±0.5 mm)\u003c\/td\u003e\n      \u003ctd\u003e12 = 12 mm\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003ePatch Lock Option\u003c\/td\u003e\n      \u003ctd\u003eSuffix\u003c\/td\u003e\n      \u003ctd\u003eP = Patch lock applied (leave blank if not required)\u003c\/td\u003e\n      \u003ctd\u003eP = with patch lock\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cp\u003e\u003cstrong\u003eExample:\u003c\/strong\u003e \u003ccode\u003e115-041-060-12 P\u003c\/code\u003e = Metric SEMS M-Type, Passivated, M6, 12 mm long, with Patch Lock\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eAvailable Lengths (L ±0.5 mm):\u003c\/strong\u003e 6 mm · 8 mm · 10 mm · 12 mm · 16 mm · 20 mm · 25 mm · 30 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\n        \u003cp style=\"color:#999;font-size:12px;\"\u003e[Product Image 1]\u003c\/p\u003e\n      \u003c\/td\u003e\n      \u003ctd style=\"width:25%;text-align:center;vertical-align:top;border:1px solid #ddd;padding:16px;\"\u003e\n        \u003cp style=\"color:#999;font-size:12px;\"\u003e[Product Image 2]\u003c\/p\u003e\n      \u003c\/td\u003e\n      \u003ctd style=\"width:25%;text-align:center;vertical-align:top;border:1px solid #ddd;padding:16px;\"\u003e\n        \u003cp style=\"color:#999;font-size:12px;\"\u003e[Product Image 3]\u003c\/p\u003e\n      \u003c\/td\u003e\n      \u003ctd style=\"width:25%;text-align:center;vertical-align:top;border:1px solid #ddd;padding:16px;\"\u003e\n        \u003cp style=\"color:#999;font-size:12px;\"\u003e[Product Image 4]\u003c\/p\u003e\n      \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 M-Type Double Washer Socket Cap Head SEMS Screws are engineered for applications where a compact washer footprint, vibration resistance, and assembly efficiency are simultaneously required:\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eElectronics \u0026amp; Precision Instruments\u003c\/strong\u003e — PCB mounting, sensor housings, and compact electronic enclosures where tight hole spacing makes standard or large washers impractical.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompact Machinery \u0026amp; Robotics\u003c\/strong\u003e — servo motor mounting, actuator brackets, and robot arm assemblies where confined access and close hole patterns demand a small washer footprint.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAutomotive \u0026amp; Transportation\u003c\/strong\u003e — interior trim, dashboard components, and underbody assemblies where space constraints limit washer size but vibration resistance remains essential.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSheet Metal Fabrication\u003c\/strong\u003e — thin panel fastening in enclosures and cabinets where the DIN 433 small washer provides adequate load distribution without overlapping adjacent features.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSemiconductor \u0026amp; Cleanroom Equipment\u003c\/strong\u003e — the captive washer design eliminates loose washer contamination risk; available with Cleanroom Wash \u0026amp; Packaging Service.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOffshore \u0026amp; Marine\u003c\/strong\u003e — corrosion-resistant A2-70 stainless steel makes these screws suitable for saltwater-exposed structures and marine instrument enclosures.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOptical \u0026amp; Medical Devices\u003c\/strong\u003e — compact, low-profile fastening for precision optical mounts, medical device housings, and laboratory equipment where minimal footprint is critical.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRenewable Energy\u003c\/strong\u003e — solar inverter enclosures, wind turbine control panels, and electrical cabinet assembly where space-efficient fastening is required.\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 from raw material to finished fastener.\u003c\/li\u003e\n  \u003cli\u003e📐 \u003cstrong\u003eEngineering-Grade Data\u003c\/strong\u003e — complete dimensional data, material certifications, and test reports available on request.\u003c\/li\u003e\n  \u003cli\u003e📦 \u003cstrong\u003eBulk \u0026amp; Wholesale Supply\u003c\/strong\u003e — competitive pricing for high-volume orders; custom packaging and kitting available.\u003c\/li\u003e\n  \u003cli\u003e🌍 \u003cstrong\u003eGlobal Distribution\u003c\/strong\u003e — experienced in international logistics and export documentation for worldwide customers.\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eCompliance\u003c\/strong\u003e — RoHS and REACH compliant; DIN 433 and ISO standard dimensions; material traceability available.\u003c\/li\u003e\n  \u003cli\u003e🔧 \u003cstrong\u003eCustom Specifications\u003c\/strong\u003e — special dimensions, lengths, finishes, and patch lock options available on request.\u003c\/li\u003e\n  \u003cli\u003e🧪 \u003cstrong\u003eRelated Services\u003c\/strong\u003e — Cleanroom Wash \u0026amp; Packaging Service and Vibration Resistant Treatment Service available.\u003c\/li\u003e\n\u003c\/ul\u003e","products":[{"product_id":"359523","title":"M3-0.5x6 M-Type Double Washer Socket Cap Head SEMS Screws - High Tensile Stainless Steel (A2-70) 25000 Pcs per Carton","description":"","brand":"fullerkreg","offers":[{"title":"Default Title","offer_id":53975844257903,"sku":"359523","price":300.0,"currency_code":"USD","in_stock":true}]},{"product_id":"359524","title":"M3-0.5x8 M-Type Double Washer Socket Cap Head SEMS Screws - High Tensile Stainless Steel (A2-70) 20000 Pcs per Carton","description":"","brand":"fullerkreg","offers":[{"title":"Default Title","offer_id":53975844290671,"sku":"359524","price":240.0,"currency_code":"USD","in_stock":false}]},{"product_id":"359525","title":"M3-0.5x10 M-Type Double Washer Socket Cap Head SEMS Screws - High Tensile Stainless Steel (A2-70) 18000 Pcs per Carton","description":"","brand":"fullerkreg","offers":[{"title":"Default Title","offer_id":53975844323439,"sku":"359525","price":234.0,"currency_code":"USD","in_stock":true}]},{"product_id":"359526","title":"M3-0.5x12 M-Type Double Washer Socket Cap Head SEMS Screws - High Tensile Stainless Steel (A2-70) 18000 Pcs per Carton","description":"","brand":"fullerkreg","offers":[{"title":"Default Title","offer_id":53975844356207,"sku":"359526","price":234.0,"currency_code":"USD","in_stock":true}]},{"product_id":"359527","title":"M3-0.5x14 M-Type Double Washer Socket Cap Head SEMS Screws - High Tensile Stainless Steel (A2-70) 15000 Pcs per 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