{"title":"Metric Hexagon Socket Screw Plug with Collar MF (DIN 908) — Carbon Steel, Zinc CR3","description":"\u003ch1\u003eMetric Hexagon Socket Screw Plug with Collar MF — DIN 908 — Carbon Steel, Zinc CR3\u003c\/h1\u003e\n\n\u003cp\u003eFULLERKREG DIN 908 MF metric fine thread hexagon socket screw plugs with collar are manufactured from 35K carbon steel to Grade 6.8, with a bright Zinc CR3 (trivalent chromium) electroplated surface finish. Zinc CR3 plating provides significantly superior corrosion resistance compared to black oxide — meeting RoHS and ELV directives by eliminating hexavalent chromium (Cr6+) — making these plugs suitable for general industrial, automotive, and outdoor applications where enhanced corrosion protection is required.\u003c\/p\u003e\n\n\u003cp\u003eThe integrated collar (flange) provides a wider sealing bearing surface and positive stop for consistent seating depth. The metric fine (MF) thread delivers superior vibration resistance and precise torque control. The internal hexagon (Allen key) drive allows installation in recessed or confined port locations.\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eProduct Specifications\u003c\/h2\u003e\n\u003ctable\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eStandard\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDIN 908 (MF — Metric Fine Thread with Collar)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eThread Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMetric fine (MF) straight thread per ISO 261 \/ DIN 13\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eHead Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFlat head with collar (flange) and internal hexagon (Allen key) drive\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCollar Function\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eWider sealing face, positive stop, consistent seating depth\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSealing Method\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCollar face — requires copper or aluminium sealing washer (DIN 7603) or bonded seal\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCarbon Steel 35K\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eGrade\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e6.8\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSurface Finish\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eZinc CR3 — Bright Zinc Electroplated, Trivalent Chromium Passivation\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRoHS \/ ELV Compliance\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eYes — Cr3+ trivalent chromium, no hexavalent chromium (Cr6+)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eZinc Layer Thickness\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eTypically 5–8 μm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSalt Spray Resistance\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e≥ 120 hours to white rust (per ISO 9227)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSize Range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eM10 × 1 — M52 × 2 (fine pitch)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDrive Tool\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eInternal hexagon (Allen key) per ISO 2936\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eProduct Gallery\u003c\/h2\u003e\n\u003ctable\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"width:25%; text-align:center; padding:12px;\"\u003e[Product Photo 1]\u003c\/td\u003e\n      \u003ctd style=\"width:25%; text-align:center; padding:12px;\"\u003e[Product Photo 2]\u003c\/td\u003e\n      \u003ctd style=\"width:25%; text-align:center; padding:12px;\"\u003e[Product Photo 3]\u003c\/td\u003e\n      \u003ctd style=\"width:25%; text-align:center; padding:12px;\"\u003e[Product Photo 4]\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eDimensional Data — DIN 908 MF Socket Screw Plugs with Collar\u003c\/h2\u003e\n\u003cp\u003eAll dimensions in millimeters (mm). MF = Metric Fine thread. Data per DIN 908 standard.\u003c\/p\u003e\n\n\u003ctable\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eThread (d)\u003c\/th\u003e\n      \u003cth\u003ePitch (mm)\u003c\/th\u003e\n      \u003cth\u003es — A\/F (mm)\u003c\/th\u003e\n      \u003cth\u003ee — A\/C (mm)\u003c\/th\u003e\n      \u003cth\u003ek — Head Height (mm)\u003c\/th\u003e\n      \u003cth\u003et — Socket Depth (mm)\u003c\/th\u003e\n      \u003cth\u003eD — Collar Ø (mm)\u003c\/th\u003e\n      \u003cth\u003eSealing Ø (mm)\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM10\u003c\/td\u003e\n\u003ctd\u003e1.0\u003c\/td\u003e\n\u003ctd\u003e17\u003c\/td\u003e\n\u003ctd\u003e19.6\u003c\/td\u003e\n\u003ctd\u003e4\u003c\/td\u003e\n\u003ctd\u003e3\u003c\/td\u003e\n\u003ctd\u003e16\u003c\/td\u003e\n\u003ctd\u003e10\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM12\u003c\/td\u003e\n\u003ctd\u003e1.5\u003c\/td\u003e\n\u003ctd\u003e19\u003c\/td\u003e\n\u003ctd\u003e21.9\u003c\/td\u003e\n\u003ctd\u003e5\u003c\/td\u003e\n\u003ctd\u003e4\u003c\/td\u003e\n\u003ctd\u003e18\u003c\/td\u003e\n\u003ctd\u003e12\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM14\u003c\/td\u003e\n\u003ctd\u003e1.5\u003c\/td\u003e\n\u003ctd\u003e22\u003c\/td\u003e\n\u003ctd\u003e25.4\u003c\/td\u003e\n\u003ctd\u003e5\u003c\/td\u003e\n\u003ctd\u003e4\u003c\/td\u003e\n\u003ctd\u003e20\u003c\/td\u003e\n\u003ctd\u003e14\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM16\u003c\/td\u003e\n\u003ctd\u003e1.5\u003c\/td\u003e\n\u003ctd\u003e24\u003c\/td\u003e\n\u003ctd\u003e27.7\u003c\/td\u003e\n\u003ctd\u003e6\u003c\/td\u003e\n\u003ctd\u003e5\u003c\/td\u003e\n\u003ctd\u003e22\u003c\/td\u003e\n\u003ctd\u003e16\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM18\u003c\/td\u003e\n\u003ctd\u003e1.5\u003c\/td\u003e\n\u003ctd\u003e27\u003c\/td\u003e\n\u003ctd\u003e31.2\u003c\/td\u003e\n\u003ctd\u003e6\u003c\/td\u003e\n\u003ctd\u003e5\u003c\/td\u003e\n\u003ctd\u003e25\u003c\/td\u003e\n\u003ctd\u003e18\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM20\u003c\/td\u003e\n\u003ctd\u003e1.5\u003c\/td\u003e\n\u003ctd\u003e30\u003c\/td\u003e\n\u003ctd\u003e34.6\u003c\/td\u003e\n\u003ctd\u003e7\u003c\/td\u003e\n\u003ctd\u003e6\u003c\/td\u003e\n\u003ctd\u003e28\u003c\/td\u003e\n\u003ctd\u003e20\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM22\u003c\/td\u003e\n\u003ctd\u003e1.5\u003c\/td\u003e\n\u003ctd\u003e32\u003c\/td\u003e\n\u003ctd\u003e36.9\u003c\/td\u003e\n\u003ctd\u003e7\u003c\/td\u003e\n\u003ctd\u003e6\u003c\/td\u003e\n\u003ctd\u003e30\u003c\/td\u003e\n\u003ctd\u003e22\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM24\u003c\/td\u003e\n\u003ctd\u003e2.0\u003c\/td\u003e\n\u003ctd\u003e36\u003c\/td\u003e\n\u003ctd\u003e41.6\u003c\/td\u003e\n\u003ctd\u003e8\u003c\/td\u003e\n\u003ctd\u003e6\u003c\/td\u003e\n\u003ctd\u003e34\u003c\/td\u003e\n\u003ctd\u003e24\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM26\u003c\/td\u003e\n\u003ctd\u003e1.5\u003c\/td\u003e\n\u003ctd\u003e36\u003c\/td\u003e\n\u003ctd\u003e41.6\u003c\/td\u003e\n\u003ctd\u003e8\u003c\/td\u003e\n\u003ctd\u003e6\u003c\/td\u003e\n\u003ctd\u003e34\u003c\/td\u003e\n\u003ctd\u003e26\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM27\u003c\/td\u003e\n\u003ctd\u003e2.0\u003c\/td\u003e\n\u003ctd\u003e41\u003c\/td\u003e\n\u003ctd\u003e47.3\u003c\/td\u003e\n\u003ctd\u003e8\u003c\/td\u003e\n\u003ctd\u003e6\u003c\/td\u003e\n\u003ctd\u003e38\u003c\/td\u003e\n\u003ctd\u003e27\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM30\u003c\/td\u003e\n\u003ctd\u003e2.0\u003c\/td\u003e\n\u003ctd\u003e46\u003c\/td\u003e\n\u003ctd\u003e53.1\u003c\/td\u003e\n\u003ctd\u003e9\u003c\/td\u003e\n\u003ctd\u003e8\u003c\/td\u003e\n\u003ctd\u003e42\u003c\/td\u003e\n\u003ctd\u003e30\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM33\u003c\/td\u003e\n\u003ctd\u003e2.0\u003c\/td\u003e\n\u003ctd\u003e50\u003c\/td\u003e\n\u003ctd\u003e57.7\u003c\/td\u003e\n\u003ctd\u003e10\u003c\/td\u003e\n\u003ctd\u003e8\u003c\/td\u003e\n\u003ctd\u003e46\u003c\/td\u003e\n\u003ctd\u003e33\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM36\u003c\/td\u003e\n\u003ctd\u003e2.0\u003c\/td\u003e\n\u003ctd\u003e55\u003c\/td\u003e\n\u003ctd\u003e63.5\u003c\/td\u003e\n\u003ctd\u003e10\u003c\/td\u003e\n\u003ctd\u003e8\u003c\/td\u003e\n\u003ctd\u003e50\u003c\/td\u003e\n\u003ctd\u003e36\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM38\u003c\/td\u003e\n\u003ctd\u003e1.5\u003c\/td\u003e\n\u003ctd\u003e55\u003c\/td\u003e\n\u003ctd\u003e63.5\u003c\/td\u003e\n\u003ctd\u003e10\u003c\/td\u003e\n\u003ctd\u003e8\u003c\/td\u003e\n\u003ctd\u003e52\u003c\/td\u003e\n\u003ctd\u003e38\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM42\u003c\/td\u003e\n\u003ctd\u003e2.0\u003c\/td\u003e\n\u003ctd\u003e65\u003c\/td\u003e\n\u003ctd\u003e75.1\u003c\/td\u003e\n\u003ctd\u003e12\u003c\/td\u003e\n\u003ctd\u003e10\u003c\/td\u003e\n\u003ctd\u003e60\u003c\/td\u003e\n\u003ctd\u003e42\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM45\u003c\/td\u003e\n\u003ctd\u003e2.0\u003c\/td\u003e\n\u003ctd\u003e70\u003c\/td\u003e\n\u003ctd\u003e80.8\u003c\/td\u003e\n\u003ctd\u003e12\u003c\/td\u003e\n\u003ctd\u003e10\u003c\/td\u003e\n\u003ctd\u003e64\u003c\/td\u003e\n\u003ctd\u003e45\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM48\u003c\/td\u003e\n\u003ctd\u003e2.0\u003c\/td\u003e\n\u003ctd\u003e75\u003c\/td\u003e\n\u003ctd\u003e86.6\u003c\/td\u003e\n\u003ctd\u003e14\u003c\/td\u003e\n\u003ctd\u003e12\u003c\/td\u003e\n\u003ctd\u003e68\u003c\/td\u003e\n\u003ctd\u003e48\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM52\u003c\/td\u003e\n\u003ctd\u003e2.0\u003c\/td\u003e\n\u003ctd\u003e80\u003c\/td\u003e\n\u003ctd\u003e92.4\u003c\/td\u003e\n\u003ctd\u003e14\u003c\/td\u003e\n\u003ctd\u003e12\u003c\/td\u003e\n\u003ctd\u003e72\u003c\/td\u003e\n\u003ctd\u003e52\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cem\u003e* s = across flats (A\/F); e = across corners (A\/C); k = head height; t = minimum socket depth; D = collar outer diameter. All dimensions per DIN 908. Zinc CR3 plating adds ~5–8μm per surface — does not affect thread fit class.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eAllen Key (Hex Key) Size Reference\u003c\/h2\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eThread\u003c\/th\u003e\n      \u003cth\u003eM10\u003c\/th\u003e\n\u003cth\u003eM12\u003c\/th\u003e\n\u003cth\u003eM14\u003c\/th\u003e\n\u003cth\u003eM16\u003c\/th\u003e\n\u003cth\u003eM18\u003c\/th\u003e\n\u003cth\u003eM20\u003c\/th\u003e\n\u003cth\u003eM22\u003c\/th\u003e\n\u003cth\u003eM24\u003c\/th\u003e\n\u003cth\u003eM27\u003c\/th\u003e\n\u003cth\u003eM30\u003c\/th\u003e\n\u003cth\u003eM33\u003c\/th\u003e\n\u003cth\u003eM36\u003c\/th\u003e\n\u003cth\u003eM42\u003c\/th\u003e\n\u003cth\u003eM48\u003c\/th\u003e\n\u003cth\u003eM52\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n      \u003ctd\u003e\u003cstrong\u003eHex Key (mm)\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd\u003e14\u003c\/td\u003e\n\u003ctd\u003e17\u003c\/td\u003e\n\u003ctd\u003e19\u003c\/td\u003e\n\u003ctd\u003e22\u003c\/td\u003e\n\u003ctd\u003e24\u003c\/td\u003e\n\u003ctd\u003e27\u003c\/td\u003e\n\u003ctd\u003e30\u003c\/td\u003e\n\u003ctd\u003e32\u003c\/td\u003e\n\u003ctd\u003e36\u003c\/td\u003e\n\u003ctd\u003e41\u003c\/td\u003e\n\u003ctd\u003e46\u003c\/td\u003e\n\u003ctd\u003e50\u003c\/td\u003e\n\u003ctd\u003e55\u003c\/td\u003e\n\u003ctd\u003e65\u003c\/td\u003e\n\u003ctd\u003e70\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eMaterial \u0026amp; Surface Finish Properties\u003c\/h2\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n\u003cth\u003eProperty\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eBase Material\u003c\/td\u003e\n\u003ctd\u003eCarbon Steel 35K (medium carbon steel)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eProperty Class\u003c\/td\u003e\n\u003ctd\u003eGrade 6.8\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eTensile Strength (Rm)\u003c\/td\u003e\n\u003ctd\u003e≥ 600 MPa\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e0.2% Proof Stress (Rp0.2)\u003c\/td\u003e\n\u003ctd\u003e≥ 480 MPa\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eHardness\u003c\/td\u003e\n\u003ctd\u003e190 – 250 HV\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eSurface Treatment\u003c\/td\u003e\n\u003ctd\u003eZinc electroplating + Trivalent Chromium (CR3) passivation\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eZinc Layer Thickness\u003c\/td\u003e\n\u003ctd\u003e5 – 8 μm (typical)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003ePassivation Type\u003c\/td\u003e\n\u003ctd\u003eTrivalent chromium (Cr3+) — RoHS \u0026amp; ELV compliant\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eSalt Spray Resistance\u003c\/td\u003e\n\u003ctd\u003e≥ 120 hours to white rust \/ ≥ 240 hours to red rust (ISO 9227)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eAppearance\u003c\/td\u003e\n\u003ctd\u003eBright silver \/ light blue iridescent\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eTemperature Limit\u003c\/td\u003e\n\u003ctd\u003eUp to +120°C (zinc plating degrades above this)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eRoHS \/ ELV\u003c\/td\u003e\n\u003ctd\u003eCompliant — no hexavalent chromium (Cr6+)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eMagnetic\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eZinc CR3 vs Black Oxide — Surface Finish Comparison\u003c\/h2\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eProperty\u003c\/th\u003e\n      \u003cth\u003eZinc CR3 (This Product)\u003c\/th\u003e\n      \u003cth\u003eBlack Oxide\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eCorrosion resistance\u003c\/td\u003e\n\u003ctd\u003eGood — ≥120h salt spray to white rust\u003c\/td\u003e\n\u003ctd\u003eMild — requires oil for protection\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eCoating thickness\u003c\/td\u003e\n\u003ctd\u003e5–8 μm zinc layer\u003c\/td\u003e\n\u003ctd\u003e1–2 μm (negligible)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eRoHS compliance\u003c\/td\u003e\n\u003ctd\u003eYes — Cr3+ trivalent\u003c\/td\u003e\n\u003ctd\u003eYes (black oxide is RoHS compliant)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eAppearance\u003c\/td\u003e\n\u003ctd\u003eBright silver \/ light blue iridescent\u003c\/td\u003e\n\u003ctd\u003eMatte black\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eTemperature limit\u003c\/td\u003e\n\u003ctd\u003e+120°C\u003c\/td\u003e\n\u003ctd\u003e+150°C\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eOutdoor use\u003c\/td\u003e\n\u003ctd\u003eSuitable with periodic inspection\u003c\/td\u003e\n\u003ctd\u003eNot recommended without oil coating\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eAutomotive \/ OEM\u003c\/td\u003e\n\u003ctd\u003ePreferred — meets most OEM zinc plating specs\u003c\/td\u003e\n\u003ctd\u003eLess common for external use\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eBest for\u003c\/td\u003e\n\u003ctd\u003eGeneral industrial, automotive, outdoor, humid environments\u003c\/td\u003e\n\u003ctd\u003eIndoor, oil-wetted, hydraulic systems\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eSealing \u0026amp; Installation Notes\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread type:\u003c\/strong\u003e Metric fine (MF) straight thread — does NOT self-seal. A sealing washer or bonded seal is required.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRecommended sealant:\u003c\/strong\u003e Copper or aluminium sealing washer (DIN 7603), or bonded seal (Dowty washer) for hydraulic applications.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePort compatibility:\u003c\/strong\u003e MF fine thread — ensure the mating port is tapped to the same fine pitch. Do NOT install in standard metric coarse-tapped ports.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eZinc plating \u0026amp; thread fit:\u003c\/strong\u003e Zinc CR3 plating (5–8μm) does not affect standard thread fit class — plugs install normally in MF-tapped ports.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTorque:\u003c\/strong\u003e Apply recommended torque per thread size. The collar provides a positive stop — do not over-torque beyond collar contact.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRe-use:\u003c\/strong\u003e Replace sealing washer on each re-installation. Inspect zinc surface for damage or red rust before re-use in critical applications.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDrive tool:\u003c\/strong\u003e Use a correctly sized hex key or hex bit socket. Worn keys risk rounding the socket.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eTypical Applications\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e🔧 \u003cstrong\u003eHydraulic manifolds \u0026amp; valve blocks\u003c\/strong\u003e — sealing unused MF-tapped ports where enhanced corrosion protection vs black oxide is required\u003c\/li\u003e\n  \u003cli\u003e🚗 \u003cstrong\u003eAutomotive \u0026amp; OEM equipment\u003c\/strong\u003e — zinc CR3 meets most automotive OEM surface finish specifications\u003c\/li\u003e\n  \u003cli\u003e⚙️ \u003cstrong\u003eMachine tools \u0026amp; industrial machinery\u003c\/strong\u003e — coolant and lubrication circuit port closures in humid or wash-down environments\u003c\/li\u003e\n  \u003cli\u003e🏡 \u003cstrong\u003eOutdoor \u0026amp; exposed installations\u003c\/strong\u003e — where black oxide would corrode without oil protection\u003c\/li\u003e\n  \u003cli\u003e💨 \u003cstrong\u003ePneumatic systems\u003c\/strong\u003e — closing unused ports in pneumatic valve manifolds with fine-thread ports\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What is Zinc CR3 and why is it RoHS compliant?\u003c\/strong\u003e\u003cbr\u003e\nA: Zinc CR3 refers to zinc electroplating with a trivalent chromium (Cr3+) passivation layer. Unlike older hexavalent chromium (Cr6+) yellow zinc plating, CR3 contains no hexavalent chromium — making it fully compliant with RoHS (Restriction of Hazardous Substances) and ELV (End of Life Vehicles) directives.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: How does Zinc CR3 compare to black oxide for corrosion resistance?\u003c\/strong\u003e\u003cbr\u003e\nA: Zinc CR3 provides significantly better corrosion resistance — typically ≥120 hours to white rust in salt spray testing (ISO 9227), compared to black oxide which requires oil to provide any meaningful protection. For outdoor, humid, or wash-down environments, Zinc CR3 is the preferred choice.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Does the zinc plating affect thread fit?\u003c\/strong\u003e\u003cbr\u003e\nA: The zinc CR3 layer is typically 5–8μm thick — thin enough that it does not affect standard thread fit class. Plugs install normally in MF-tapped ports without modification.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What does MF mean and can I use this in a standard metric port?\u003c\/strong\u003e\u003cbr\u003e\nA: MF = Metric Fine thread. The pitch is finer than standard metric coarse. MF plugs are NOT interchangeable with standard metric coarse-tapped ports — always verify the port thread pitch before ordering.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What is the purpose of the collar?\u003c\/strong\u003e\u003cbr\u003e\nA: The collar provides a wider sealing bearing surface for the sealing washer, acts as a positive mechanical stop for consistent seating depth, and helps centre the plug during installation — improving sealing reliability and assembly consistency.\u003c\/p\u003e","products":[],"url":"https:\/\/www.fullerkr.com\/collections\/metric-hexagon-socket-screw-plug-with-collar-mf-din-908-steel-zinc-cr3.oembed","provider":"Fullerkreg Fasteners","version":"1.0","type":"link"}