{"title":"Imperial Hexagon Socket Screw Plug with Collar, Pipe Thread (DIN 908) — Carbon Steel, Black Oxide","description":"\u003ch1\u003eImperial Hexagon Socket Screw Plug with Collar, Pipe Thread (DIN 908) — Carbon Steel, Black Oxide\u003c\/h1\u003e\n\n\u003cp\u003eFULLERKREG DIN 908 imperial pipe thread hexagon socket screw plugs with collar are manufactured from 35K carbon steel to Grade 6.8, with a black oxide surface finish. These plugs feature British Standard Pipe Parallel (BSPP \/ G thread) — the straight parallel pipe thread widely used in hydraulic and pneumatic systems across the UK, Europe, Asia, and Commonwealth markets.\u003c\/p\u003e\n\n\u003cp\u003eThe integrated collar (flange) provides a wider sealing bearing surface and positive stop for consistent seating depth. The black oxide finish provides a clean, low-reflectance appearance and mild corrosion protection when oil-wetted — making these plugs well-suited for hydraulic manifolds, machine tool circuits, and indoor industrial fluid systems. 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 (Imperial Pipe Thread — BSPP 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\u003eBSPP — British Standard Pipe Parallel (G thread) per ISO 228-1 \/ BS EN ISO 228\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eThread Profile\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eWhitworth 55° thread form, parallel (straight) — does NOT self-seal\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 bonded seal (Dowty washer) or O-ring face 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\u003eBlack Oxide (Blackened)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBlack Oxide Thickness\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1–2 μm (does not affect thread tolerances)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSize Range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eG1\/8 — G2 (BSPP)\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    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBest For\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eIndoor, oil-wetted hydraulic systems; hydraulic manifolds; machine tool circuits\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 BSPP Imperial Pipe Thread Socket Plugs with Collar\u003c\/h2\u003e\n\u003cp\u003eAll dimensions in millimeters (mm) unless noted. Thread sizes in BSP (G) designation. Data per DIN 908 standard.\u003c\/p\u003e\n\n\u003ctable\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eThread (G)\u003c\/th\u003e\n      \u003cth\u003eTPI\u003c\/th\u003e\n      \u003cth\u003eThread Ø (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    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eG 1\/8\u003c\/td\u003e\n\u003ctd\u003e28\u003c\/td\u003e\n\u003ctd\u003e9.728\u003c\/td\u003e\n\u003ctd\u003e14\u003c\/td\u003e\n\u003ctd\u003e16.2\u003c\/td\u003e\n\u003ctd\u003e4\u003c\/td\u003e\n\u003ctd\u003e3\u003c\/td\u003e\n\u003ctd\u003e16\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eG 1\/4\u003c\/td\u003e\n\u003ctd\u003e19\u003c\/td\u003e\n\u003ctd\u003e13.157\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\u003e22\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eG 3\/8\u003c\/td\u003e\n\u003ctd\u003e19\u003c\/td\u003e\n\u003ctd\u003e16.662\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\u003e27\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eG 1\/2\u003c\/td\u003e\n\u003ctd\u003e14\u003c\/td\u003e\n\u003ctd\u003e20.955\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\u003e34\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eG 5\/8\u003c\/td\u003e\n\u003ctd\u003e14\u003c\/td\u003e\n\u003ctd\u003e22.911\u003c\/td\u003e\n\u003ctd\u003e30\u003c\/td\u003e\n\u003ctd\u003e34.6\u003c\/td\u003e\n\u003ctd\u003e6\u003c\/td\u003e\n\u003ctd\u003e5\u003c\/td\u003e\n\u003ctd\u003e36\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eG 3\/4\u003c\/td\u003e\n\u003ctd\u003e14\u003c\/td\u003e\n\u003ctd\u003e26.441\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\u003e41\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eG 7\/8\u003c\/td\u003e\n\u003ctd\u003e14\u003c\/td\u003e\n\u003ctd\u003e30.201\u003c\/td\u003e\n\u003ctd\u003e36\u003c\/td\u003e\n\u003ctd\u003e41.6\u003c\/td\u003e\n\u003ctd\u003e7\u003c\/td\u003e\n\u003ctd\u003e6\u003c\/td\u003e\n\u003ctd\u003e46\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eG 1\u003c\/td\u003e\n\u003ctd\u003e11\u003c\/td\u003e\n\u003ctd\u003e33.249\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\u003e50\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eG 1 1\/8\u003c\/td\u003e\n\u003ctd\u003e11\u003c\/td\u003e\n\u003ctd\u003e37.897\u003c\/td\u003e\n\u003ctd\u003e46\u003c\/td\u003e\n\u003ctd\u003e53.1\u003c\/td\u003e\n\u003ctd\u003e8\u003c\/td\u003e\n\u003ctd\u003e6\u003c\/td\u003e\n\u003ctd\u003e55\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eG 1 1\/4\u003c\/td\u003e\n\u003ctd\u003e11\u003c\/td\u003e\n\u003ctd\u003e41.910\u003c\/td\u003e\n\u003ctd\u003e50\u003c\/td\u003e\n\u003ctd\u003e57.7\u003c\/td\u003e\n\u003ctd\u003e9\u003c\/td\u003e\n\u003ctd\u003e8\u003c\/td\u003e\n\u003ctd\u003e60\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eG 1 1\/2\u003c\/td\u003e\n\u003ctd\u003e11\u003c\/td\u003e\n\u003ctd\u003e47.803\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\u003e68\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eG 1 3\/4\u003c\/td\u003e\n\u003ctd\u003e11\u003c\/td\u003e\n\u003ctd\u003e53.746\u003c\/td\u003e\n\u003ctd\u003e60\u003c\/td\u003e\n\u003ctd\u003e69.3\u003c\/td\u003e\n\u003ctd\u003e10\u003c\/td\u003e\n\u003ctd\u003e8\u003c\/td\u003e\n\u003ctd\u003e75\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eG 2\u003c\/td\u003e\n\u003ctd\u003e11\u003c\/td\u003e\n\u003ctd\u003e59.614\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\u003e80\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; TPI = threads per inch. All dimensions per DIN 908 \/ ISO 228-1. Black oxide coating (1–2μm) does not affect thread fit.\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\u003eG1\/8\u003c\/th\u003e\n\u003cth\u003eG1\/4\u003c\/th\u003e\n\u003cth\u003eG3\/8\u003c\/th\u003e\n\u003cth\u003eG1\/2\u003c\/th\u003e\n\u003cth\u003eG3\/4\u003c\/th\u003e\n\u003cth\u003eG1\u003c\/th\u003e\n\u003cth\u003eG1¼\u003c\/th\u003e\n\u003cth\u003eG1½\u003c\/th\u003e\n\u003cth\u003eG2\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\u003e12\u003c\/td\u003e\n\u003ctd\u003e17\u003c\/td\u003e\n\u003ctd\u003e19\u003c\/td\u003e\n\u003ctd\u003e24\u003c\/td\u003e\n\u003ctd\u003e30\u003c\/td\u003e\n\u003ctd\u003e36\u003c\/td\u003e\n\u003ctd\u003e46\u003c\/td\u003e\n\u003ctd\u003e50\u003c\/td\u003e\n\u003ctd\u003e60\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\u003eBlack Oxide (alkaline blackening \/ hot black oxide process)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eBlack Oxide Thickness\u003c\/td\u003e\n\u003ctd\u003e1 – 2 μm (negligible — does not affect thread fit)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eCorrosion Resistance\u003c\/td\u003e\n\u003ctd\u003eMild — oil-wetted service recommended. Apply hydraulic oil or anti-corrosion grease for protection.\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eAppearance\u003c\/td\u003e\n\u003ctd\u003eMatte black — low reflectance, clean industrial finish\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eTemperature Limit\u003c\/td\u003e\n\u003ctd\u003e−30°C to +150°C (black oxide service range)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eRoHS\u003c\/td\u003e\n\u003ctd\u003eCompliant\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\u003eBlack Oxide vs Zinc CR3 — Which Surface Finish to Choose?\u003c\/h2\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eProperty\u003c\/th\u003e\n      \u003cth\u003eBlack Oxide (This Product)\u003c\/th\u003e\n      \u003cth\u003eZinc CR3\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\u003eMild — requires oil for meaningful protection\u003c\/td\u003e\n\u003ctd\u003eGood — ≥120h salt spray to white rust\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eCoating thickness\u003c\/td\u003e\n\u003ctd\u003e1–2 μm (negligible)\u003c\/td\u003e\n\u003ctd\u003e5–8 μm zinc layer\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eAppearance\u003c\/td\u003e\n\u003ctd\u003eMatte black — low reflectance\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\u003e+150°C\u003c\/td\u003e\n\u003ctd\u003e+120°C\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eOil-wetted service\u003c\/td\u003e\n\u003ctd\u003eExcellent — black oxide is oil-retentive\u003c\/td\u003e\n\u003ctd\u003eGood\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eOutdoor \/ humid use\u003c\/td\u003e\n\u003ctd\u003eNot recommended without oil coating\u003c\/td\u003e\n\u003ctd\u003eSuitable with periodic inspection\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eHydraulic manifolds (indoor)\u003c\/td\u003e\n\u003ctd\u003e✅ Preferred — oil-wetted, clean appearance\u003c\/td\u003e\n\u003ctd\u003e✅ Suitable\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eOutdoor \/ wash-down\u003c\/td\u003e\n\u003ctd\u003e❌ Not recommended\u003c\/td\u003e\n\u003ctd\u003e✅ Preferred\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eHigher temperature (\u0026gt;120°C)\u003c\/td\u003e\n\u003ctd\u003e✅ Suitable to +150°C\u003c\/td\u003e\n\u003ctd\u003e❌ Not recommended above +120°C\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 BSPP (G thread) is a parallel thread — it does NOT self-seal through thread interference. A bonded seal (Dowty washer) or O-ring face seal is mandatory for pressure-tight installation.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRecommended sealant:\u003c\/strong\u003e Bonded seal (Dowty washer) sized to match thread designation — e.g. G1\/2 bonded seal for G1\/2 plug. O-ring face seal (ORFS) is an alternative for high-pressure hydraulic applications.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDo NOT use PTFE tape:\u003c\/strong\u003e PTFE tape is designed for tapered threads (BSPT\/NPT). It is not effective as a primary sealant for BSPP parallel threads.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePort compatibility:\u003c\/strong\u003e BSPP (G) plugs fit BSPP-tapped ports only. Do NOT install in BSPT (R thread) tapered ports.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBlack oxide \u0026amp; corrosion:\u003c\/strong\u003e Black oxide provides only mild corrosion protection. Apply hydraulic oil or anti-corrosion grease to threads and collar face before installation in humid or outdoor environments.\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 bonded seal on each re-installation. Inspect black oxide surface for 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 BSPP ports in oil-wetted hydraulic systems — black oxide is ideal in continuously oil-wetted environments\u003c\/li\u003e\n  \u003cli\u003e⚙️ \u003cstrong\u003eMachine tools \u0026amp; CNC equipment\u003c\/strong\u003e — coolant and lubrication circuit port closures with BSPP ports in indoor environments\u003c\/li\u003e\n  \u003cli\u003e💨 \u003cstrong\u003ePneumatic systems\u003c\/strong\u003e — closing unused G-thread ports on pneumatic valve manifolds\u003c\/li\u003e\n  \u003cli\u003e🚗 \u003cstrong\u003eAutomotive \u0026amp; industrial machinery\u003c\/strong\u003e — oil circuit port closures in gearboxes, power steering, and hydraulic units\u003c\/li\u003e\n  \u003cli\u003e🏭 \u003cstrong\u003eIndustrial equipment\u003c\/strong\u003e — general fluid sealing in protected indoor environments where the matte black finish is preferred aesthetically\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 BSPP (G thread) and does it self-seal?\u003c\/strong\u003e\u003cbr\u003e\nA: BSPP (British Standard Pipe Parallel) is a straight parallel thread — the thread diameter is constant along its length. Unlike BSPT (tapered pipe thread), BSPP does NOT self-seal through thread interference. A bonded seal (Dowty washer) or O-ring face seal must be used to achieve a pressure-tight connection.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Why choose black oxide over Zinc CR3 for hydraulic applications?\u003c\/strong\u003e\u003cbr\u003e\nA: Black oxide is the traditional choice for hydraulic manifold plugs used in continuously oil-wetted environments. The oil-retentive surface works synergistically with hydraulic fluid to provide adequate corrosion protection indoors. Black oxide also has a higher temperature limit (+150°C vs +120°C for zinc) and a clean matte black appearance preferred in many hydraulic assemblies. For outdoor or humid environments, Zinc CR3 is the better choice.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Can I use PTFE tape to seal a BSPP plug?\u003c\/strong\u003e\u003cbr\u003e\nA: No. PTFE tape is designed for tapered threads (BSPT\/NPT). For BSPP parallel threads, use a bonded seal (Dowty washer) or O-ring face seal — these are the correct sealing methods for G-thread connections.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What is a bonded seal (Dowty washer)?\u003c\/strong\u003e\u003cbr\u003e\nA: A bonded seal consists of a metal ring with a vulcanised rubber O-ring on the inner face. When the plug is tightened, the rubber compresses against the port face to create a pressure-tight seal. They are available in sizes matching each G-thread designation (G1\/8 through G2).\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Does black oxide affect thread fit?\u003c\/strong\u003e\u003cbr\u003e\nA: No. Black oxide is an extremely thin conversion coating (1–2μm) — it does not add measurable thickness to the thread and does not affect standard thread fit class. Plugs install normally in BSPP-tapped ports.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: How do I identify if my port is BSPP or BSPT?\u003c\/strong\u003e\u003cbr\u003e\nA: Measure the thread diameter at multiple points along the thread length. BSPP threads maintain a constant diameter; BSPT threads taper (reduce in diameter) along the thread length. When in doubt, consult the equipment manufacturer’s documentation or contact FULLERKREG for assistance.\u003c\/p\u003e","products":[],"url":"https:\/\/www.fullerkr.com\/collections\/imperial-hexagon-socket-screw-plug-with-collar-pipe-thread-din-908-steel-black.oembed","provider":"Fullerkreg Fasteners","version":"1.0","type":"link"}