{"title":"S-Type Double Washer Socket Cap Head SEMS Screws - Marine Stainless Steel (A4-70)","description":"\u003ch1\u003eS-Type Double Washer Socket Cap Head SEMS Screws – Marine Stainless Steel (A4-70)\u003c\/h1\u003e\n\n\u003cp\u003eFULLERKREG S-Type Double Washer Socket Cap Head SEMS Screws in \u003cstrong\u003eA4-70 marine grade stainless steel (SUS316)\u003c\/strong\u003e combine an ISO 4762 hex socket cap head screw with two permanently captivated washers — a \u003cstrong\u003eDIN 125 standard flat washer\u003c\/strong\u003e and a \u003cstrong\u003elock washer\u003c\/strong\u003e — assembled onto the shank by thread rolling. The A4-70 (316 stainless steel) grade provides significantly superior corrosion resistance compared to A2-70 (304), with enhanced resistance to chloride-induced pitting and crevice corrosion, making these screws the preferred choice for marine, offshore, coastal, chemical processing, and other highly corrosive environments. All components — screw body, flat washer, and lock washer — are manufactured from A4-70 (SUS316) stainless steel with passivated finish.\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\u003eS-Type Double Washer\u003c\/strong\u003e configuration pairs a \u003cstrong\u003eDIN 125 standard flat washer\u003c\/strong\u003e with a \u003cstrong\u003elock washer\u003c\/strong\u003e. DIN 125 (equivalent to ISO 7089) specifies the most widely used standard washer outer diameter, providing a balanced bearing surface suitable for the majority of general industrial and marine fastening applications. 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\u003eIn the A4-70 marine grade, every component — screw, flat washer, and lock washer — is manufactured from \u003cstrong\u003e316 austenitic stainless steel\u003c\/strong\u003e, ensuring full material compatibility and eliminating galvanic corrosion risk between components. This makes the A4-70 S-Type SEMS screw a complete, corrosion-resistant fastening solution in a single part.\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\u003eSuperior marine corrosion resistance\u003c\/strong\u003e — A4-70 (SUS316) stainless steel contains 2–3% molybdenum, providing significantly enhanced resistance to chloride pitting, crevice corrosion, and saltwater attack compared to A2-70 (304) grade.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFull material compatibility\u003c\/strong\u003e — all three components (screw, flat washer, lock washer) are A4-70 SUS316, eliminating galvanic corrosion between dissimilar metals within the fastener assembly.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eEliminates loose washers\u003c\/strong\u003e — the DIN 125 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 + flat 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\u003eHigh tensile strength\u003c\/strong\u003e — A4-70 grade delivers minimum tensile strength of 700 MPa, combining corrosion resistance with structural performance.\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\u003eFixed washer configuration\u003c\/strong\u003e — the DIN 125 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 than A2-70\u003c\/strong\u003e — A4-70 (316 stainless) carries a material premium over A2-70 (304 stainless) due to the molybdenum content; specify A4-70 only where the corrosion environment justifies the cost.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHigher unit cost than loose components\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 non-standard 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\u003eMarine Stainless Steel (SUS316 \/ A4)\u003c\/td\u003e\n      \u003ctd\u003eA4-70\u003c\/td\u003e\n      \u003ctd\u003ePassivated (Natural)\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"background-color:#f5f5f5;\"\u003e\n      \u003ctd\u003eStandard Flat Washer (DIN 125)\u003c\/td\u003e\n      \u003ctd\u003eMarine Stainless Steel (SUS316)\u003c\/td\u003e\n      \u003ctd\u003eDIN 125 \/ ISO 7089\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\u003eMarine Stainless Steel (SUS316)\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\u003ch3\u003eA4-70 vs. A2-70: Key Material Differences\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\u003eProperty\u003c\/th\u003e\n      \u003cth\u003eA2-70 (SUS304)\u003c\/th\u003e\n      \u003cth\u003eA4-70 (SUS316)\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eMolybdenum Content\u003c\/td\u003e\n      \u003ctd\u003eNone\u003c\/td\u003e\n      \u003ctd\u003e2–3%\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"background-color:#f5f5f5;\"\u003e\n      \u003ctd\u003eChloride Resistance\u003c\/td\u003e\n      \u003ctd\u003eModerate\u003c\/td\u003e\n      \u003ctd\u003eExcellent\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003ePitting Resistance (PRE)\u003c\/td\u003e\n      \u003ctd\u003e~18–20\u003c\/td\u003e\n      \u003ctd\u003e~24–26\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"background-color:#f5f5f5;\"\u003e\n      \u003ctd\u003eMin. Tensile Strength\u003c\/td\u003e\n      \u003ctd\u003e700 MPa\u003c\/td\u003e\n      \u003ctd\u003e700 MPa\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eMin. Yield Strength\u003c\/td\u003e\n      \u003ctd\u003e450 MPa\u003c\/td\u003e\n      \u003ctd\u003e450 MPa\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"background-color:#f5f5f5;\"\u003e\n      \u003ctd\u003eRecommended Environment\u003c\/td\u003e\n      \u003ctd\u003eGeneral industrial, mild outdoor\u003c\/td\u003e\n      \u003ctd\u003eMarine, offshore, chemical, coastal\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 S-Type configuration uses \u003cstrong\u003eDIN 125 standard flat washers\u003c\/strong\u003e (equivalent to ISO 7089). DIN 125 is the most widely used standard washer series, specifying a balanced outer diameter suitable for general industrial and marine fastening. The following table shows the inner diameter (d1), outer diameter (d2), and thickness (t) of the captive DIN 125 flat washers by thread size:\u003c\/p\u003e\n\n\u003ch3\u003eDIN 125 Standard Plain Washer (S-Type – used in S-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\u003e5.0\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\u003e10.0\u003c\/td\u003e\n      \u003ctd\u003e12.5\u003c\/td\u003e\n      \u003ctd\u003e17.0\u003c\/td\u003e\n      \u003ctd\u003e21.0\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 125 \/ ISO 7089 standard. All dimensions in mm.\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eDimensional Data – Metric Series (ISO 4762 Head, A4-70)\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 125 standard 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\u003e115-02(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\u003e5.0\u003c\/td\u003e\n      \u003ctd\u003e0.95\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\u003e115-02(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\u003e6.0\u003c\/td\u003e\n      \u003ctd\u003e1.1\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\u003e115-02(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\u003e7.0\u003c\/td\u003e\n      \u003ctd\u003e1.5\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\u003e115-02(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\u003e9.0\u003c\/td\u003e\n      \u003ctd\u003e1.7\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\u003e115-02(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\u003e10.0\u003c\/td\u003e\n      \u003ctd\u003e2.2\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\u003e115-02(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\u003e12.5\u003c\/td\u003e\n      \u003ctd\u003e2.2\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\u003e115-02(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\u003e17.0\u003c\/td\u003e\n      \u003ctd\u003e3.0\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\u003e115-02(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\u003e21.0\u003c\/td\u003e\n      \u003ctd\u003e3.2\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.   All dimensions in mm.\u003cbr\u003eUnit Weight (g): to be updated. Contact FULLERKREG for weight data sheets.\u003cbr\u003eD column reflects DIN 125 standard 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\u003e115-02X\u003c\/td\u003e\n      \u003ctd\u003eMetric series with DIN 125 standard flat washer + lock washer (S-Type double washer, A4-70)\u003c\/td\u003e\n      \u003ctd\u003e115-021 = Hex socket, STD washer + lock washer, Passivated\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\u003e16 = 16 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\u003e115-021-060-16 P\u003c\/code\u003e = Metric SEMS S-Type A4-70, Passivated, M6, 16 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 S-Type Double Washer Socket Cap Head SEMS Screws in A4-70 marine stainless steel are engineered for the most demanding corrosive environments where standard A2-70 stainless steel is insufficient:\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMarine \u0026amp; Offshore Structures\u003c\/strong\u003e — boat fittings, deck hardware, hull assemblies, offshore platform equipment, and subsea instrument housings where continuous saltwater exposure demands A4-70 molybdenum-bearing stainless steel.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCoastal \u0026amp; Waterfront Construction\u003c\/strong\u003e — jetties, pontoons, sea walls, and coastal architectural structures exposed to salt spray and high-humidity marine atmospheres.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eChemical Processing Equipment\u003c\/strong\u003e — reactors, pipework flanges, pump housings, and valve assemblies handling chloride-containing process fluids or acidic environments.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFood \u0026amp; Beverage Processing\u003c\/strong\u003e — hygienic equipment, processing tanks, and conveyor systems where frequent washdown with chlorinated cleaning agents requires superior corrosion resistance.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePharmaceutical \u0026amp; Cleanroom\u003c\/strong\u003e — sterile processing equipment and cleanroom structures where material purity and corrosion resistance are regulatory requirements.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSwimming Pools \u0026amp; Water Treatment\u003c\/strong\u003e — pool equipment, water treatment plant structures, and desalination plant components exposed to chlorinated or brackish water.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRenewable Energy – Offshore\u003c\/strong\u003e — offshore wind turbine nacelles, subsea cable junction boxes, and tidal energy equipment requiring long-term corrosion resistance in seawater environments.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eElectronics \u0026amp; Precision Instruments in Harsh Environments\u003c\/strong\u003e — enclosures and instrument housings deployed in coastal, tropical, or high-humidity environments where A2-70 would be susceptible to surface corrosion.\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; A4-70 material certificates available.\u003c\/li\u003e\n  \u003cli\u003e📐 \u003cstrong\u003eEngineering-Grade Data\u003c\/strong\u003e — complete dimensional data, material certifications (mill certs), and corrosion 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 for marine and offshore projects.\u003c\/li\u003e\n  \u003cli\u003e🌍 \u003cstrong\u003eGlobal Distribution\u003c\/strong\u003e — experienced in international logistics and export documentation; supply to shipyards, offshore contractors, and EPC companies worldwide.\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eCompliance\u003c\/strong\u003e — RoHS and REACH compliant; DIN 125 and ISO standard dimensions; full material traceability and heat number documentation available.\u003c\/li\u003e\n  \u003cli\u003e🔧 \u003cstrong\u003eCustom Specifications\u003c\/strong\u003e — special dimensions, lengths, finishes, and patch lock options available on request; A4-80 grade available for higher strength requirements.\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":[],"url":"https:\/\/www.fullerkr.com\/collections\/s-type-double-washer-socket-cap-head-sems-screws-marine-stainless-steel-a4-70.oembed","provider":"Fullerkreg Fasteners","version":"1.0","type":"link"}