{"title":"Metric Flat Head Socket Pipe Plugs (DIN 908) - Marine Stainless Steel (A4)","description":"\u003ch1\u003eMetric Flat Head Socket Pipe Plugs (DIN 908) — Marine Stainless Steel A4 (SUS316)\u003c\/h1\u003e\n\n\u003cp\u003eFULLERKREG DIN 908 metric flat head socket pipe plugs are manufactured from A4 marine stainless steel (SUS316) to Grade A4-70, with a whitened and passivated surface finish. The addition of molybdenum (2–3%) in SUS316 provides significantly enhanced resistance to chloride-induced pitting and crevice corrosion compared to A2 (SUS304) — making these plugs the preferred choice for marine, offshore, coastal, chemical processing, and food-grade applications where long-term corrosion resistance is critical.\u003c\/p\u003e\n\n\u003cp\u003eThe flat (parallel) metric thread combined with the flat sealing face requires a copper or aluminium sealing washer (not included) to achieve a pressure-tight seal. The internal hexagon (Allen key) drive allows installation and removal in recessed or confined spaces.\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\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 straight (parallel) 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 (flush) with internal hexagon (Allen key) drive\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSealing Method\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFlat face — requires copper or aluminium sealing washer (DIN 7603)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eA4 Marine Stainless Steel \/ SUS316 \/ 1.4401\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eGrade\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eA4-70\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSurface Finish\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eWhitened \u0026amp; Passivated\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\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\u003eKey Advantage vs A2\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSuperior chloride \u0026amp; pitting corrosion resistance due to 2–3% Mo content\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 Metric Socket Pipe Plugs\u003c\/h2\u003e\n\u003cp\u003eAll dimensions in millimeters (mm). 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\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\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\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\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\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\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\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\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\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\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\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\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\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\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\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\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\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\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\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. All dimensions per DIN 908.\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; Grade 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\u003eMaterial Designation\u003c\/td\u003e\n\u003ctd\u003eA4 \/ SUS316 \/ 1.4401 \/ 0Cr17Ni12Mo2\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eProperty Class\u003c\/td\u003e\n\u003ctd\u003eA4-70\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eTensile Strength (Rm)\u003c\/td\u003e\n\u003ctd\u003e≥ 700 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≥ 450 MPa\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eHardness\u003c\/td\u003e\n\u003ctd\u003e≤ 250 HV\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eMolybdenum Content\u003c\/td\u003e\n\u003ctd\u003e2.0 – 3.0% — key differentiator vs A2 (SUS304)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eCorrosion Resistance\u003c\/td\u003e\n\u003ctd\u003eExcellent — superior chloride, pitting \u0026amp; crevice corrosion resistance vs A2\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eMagnetic\u003c\/td\u003e\n\u003ctd\u003eSlightly magnetic after cold working\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eSurface Finish\u003c\/td\u003e\n\u003ctd\u003eWhitened \u0026amp; Passivated\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eTemperature Range\u003c\/td\u003e\n\u003ctd\u003e−50°C to +300°C (continuous service)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eA4 (SUS316) vs A2 (SUS304) — Why Choose Marine Grade?\u003c\/h2\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eProperty\u003c\/th\u003e\n      \u003cth\u003eA4 — SUS316 (This Product)\u003c\/th\u003e\n      \u003cth\u003eA2 — SUS304\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eMolybdenum\u003c\/td\u003e\n\u003ctd\u003e2–3% Mo — present\u003c\/td\u003e\n\u003ctd\u003eNone\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eChloride resistance\u003c\/td\u003e\n\u003ctd\u003eExcellent — resists seawater, de-icing salts, chlorinated water\u003c\/td\u003e\n\u003ctd\u003eGood — may pit in high-chloride environments\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003ePitting resistance (PREN)\u003c\/td\u003e\n\u003ctd\u003e~24–26\u003c\/td\u003e\n\u003ctd\u003e~18–20\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eCrevice corrosion\u003c\/td\u003e\n\u003ctd\u003eSignificantly better\u003c\/td\u003e\n\u003ctd\u003eSusceptible in chloride environments\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eAcid resistance\u003c\/td\u003e\n\u003ctd\u003eBetter in reducing acids (e.g. H₂SO₄)\u003c\/td\u003e\n\u003ctd\u003eGood in oxidising acids\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eFood \u0026amp; pharma\u003c\/td\u003e\n\u003ctd\u003ePreferred grade for food contact \u0026amp; pharmaceutical\u003c\/td\u003e\n\u003ctd\u003eAcceptable for many food applications\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eCost\u003c\/td\u003e\n\u003ctd\u003eHigher (Mo content)\u003c\/td\u003e\n\u003ctd\u003eLower\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eRecommended for\u003c\/td\u003e\n\u003ctd\u003eMarine, offshore, coastal, chemical, food, pharma\u003c\/td\u003e\n\u003ctd\u003eGeneral outdoor, mild industrial\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 straight (parallel) — does NOT self-seal. A sealing washer is mandatory for pressure-tight installation.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRecommended sealing washer:\u003c\/strong\u003e Copper (DIN 7603 Form A) or aluminium sealing washer — sized to match thread diameter. For marine\/chemical environments, consider PTFE-coated or stainless-compatible washers.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTorque:\u003c\/strong\u003e Apply recommended torque per thread size. Over-torquing may damage the sealing face or thread.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRe-use:\u003c\/strong\u003e Replace sealing washer on each re-installation to ensure leak-free seal.\u003c\/li\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eGalvanic compatibility:\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eA4 stainless is compatible with most stainless steel and titanium components. Avoid direct contact with carbon steel in wet environments.\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDrive tool:\u003c\/strong\u003e Use a correctly sized, high-quality hex key or hex bit socket. Worn or undersized 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\u003eMarine \u0026amp; offshore\u003c\/strong\u003e — sealing hydraulic and fluid ports on vessels, offshore platforms, and marine equipment\u003c\/li\u003e\n  \u003cli\u003e🌊 \u003cstrong\u003eCoastal \u0026amp; saltwater environments\u003c\/strong\u003e — where A2 stainless would be susceptible to chloride pitting\u003c\/li\u003e\n  \u003cli\u003e🧪 \u003cstrong\u003eChemical processing\u003c\/strong\u003e — sealing ports in chemical plant equipment exposed to chlorides or mild acids\u003c\/li\u003e\n  \u003cli\u003e🍼 \u003cstrong\u003eFood \u0026amp; beverage \/ pharmaceutical\u003c\/strong\u003e — hygienic port closures in food-grade and pharma processing equipment\u003c\/li\u003e\n  \u003cli\u003e🔧 \u003cstrong\u003eHydraulic systems\u003c\/strong\u003e — sealing unused ports on manifolds, cylinders, and valve blocks in marine environments\u003c\/li\u003e\n  \u003cli\u003e🏭 \u003cstrong\u003eIndustrial machinery\u003c\/strong\u003e — oil and fluid circuit port closures where superior corrosion resistance is specified\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: Why choose A4 (SUS316) over A2 (SUS304) for pipe plugs?\u003c\/strong\u003e\u003cbr\u003e\nA: A4 contains 2–3% molybdenum which dramatically improves resistance to chloride-induced pitting and crevice corrosion. In marine, coastal, or chemical environments where A2 may corrode, A4 provides reliable long-term performance.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Does DIN 908 A4 require a sealing washer?\u003c\/strong\u003e\u003cbr\u003e\nA: Yes. DIN 908 uses a straight (parallel) metric thread with a flat sealing face — it does not self-seal. A copper or aluminium sealing washer (DIN 7603) must be used to achieve a pressure-tight seal.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Is A4 stainless suitable for seawater immersion?\u003c\/strong\u003e\u003cbr\u003e\nA: A4 (SUS316) performs significantly better than A2 in seawater and high-chloride environments. However, for continuous seawater immersion under crevice conditions, consult a corrosion engineer. Duplex 2205 may be specified for the most demanding offshore applications.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What Allen key size do I need?\u003c\/strong\u003e\u003cbr\u003e\nA: The hex key size equals the across-flats (s) dimension. For example: M16 → 22mm hex key, M20 → 27mm, M24 → 32mm. See the Allen Key Size Reference table above.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Can I use PTFE tape instead of a sealing washer?\u003c\/strong\u003e\u003cbr\u003e\nA: PTFE tape is not recommended as the primary sealant for DIN 908 metric straight thread. Use a proper copper or aluminium sealing washer (DIN 7603) for a reliable, pressure-rated seal.\u003c\/p\u003e","products":[],"url":"https:\/\/www.fullerkr.com\/collections\/metric-flat-head-socket-pipe-plugs-din-908-marine-stainless-steel-a4.oembed","provider":"Fullerkreg Fasteners","version":"1.0","type":"link"}