{"title":"DIN 6798J-A2 Stainless Internal Serrated","description":"\u003ch1\u003eDIN 6798J Internal Serrated Lock Washer — A2 Stainless Steel (SUS304), Whitened \u0026amp; Passivated\u003c\/h1\u003e\n\n\u003cp\u003eFULLERKREG DIN 6798J internal serrated lock washers are manufactured to DIN 6798 Form J standard in A2 stainless steel (SUS304 \/ 1.4301 \/ 0Cr18Ni9) with a whitened and passivated surface finish. DIN 6798 Form J features internal serrations (teeth on the inner diameter) that bite into the fastener shank or bolt head bearing surface, providing positive anti-loosening performance through mechanical engagement. The internal serration design protects the outer surface of the assembly — ideal for applications where the outer appearance must be preserved. A2 stainless steel provides excellent general corrosion resistance, non-magnetic properties, and food-safe compliance.\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eProduct Highlights\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStandard:\u003c\/strong\u003e DIN 6798 Form J (Internal Serrated Lock Washer)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e A2 Stainless Steel (SUS304 \/ 1.4301 \/ 0Cr18Ni9)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSurface Treatment:\u003c\/strong\u003e Whitened \u0026amp; Passivated\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSize Range:\u003c\/strong\u003e M3 – M30\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSerration type:\u003c\/strong\u003e Internal (teeth on inner diameter — bite into fastener shank)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAnti-loosening mechanism:\u003c\/strong\u003e Mechanical tooth engagement — resists rotation under vibration\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOuter surface preserved\u003c\/strong\u003e — no marking on substrate outer surface\u003c\/li\u003e\n  \u003cli\u003e\u003cstrong\u003eNon-magnetic, non-sparking\u003c\/strong\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003cstrong\u003eRoHS \u0026amp; REACH Compliant\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eDimensional Specifications — DIN 6798 Form J (Internal Serrated), A2 Stainless\u003c\/h2\u003e\n\u003cp\u003eAll dimensions in millimeters (mm). Per DIN 6798 Form J.\u003c\/p\u003e\n\n\u003ctable\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n\u003cth\u003eFor Thread\u003c\/th\u003e\n\u003cth\u003eNominal Size\u003c\/th\u003e\n\u003cth\u003ed1 min\u003c\/th\u003e\n\u003cth\u003ed1 max\u003c\/th\u003e\n\u003cth\u003ed2 Nominal\u003c\/th\u003e\n\u003cth\u003ed3 approx.\u003c\/th\u003e\n\u003cth\u003eMin. No. of Teeth\u003c\/th\u003e\n\u003cth\u003es min\u003c\/th\u003e\n\u003cth\u003es max\u003c\/th\u003e\n\u003cth\u003ekg\/1000pcs\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\u003e3\u003c\/td\u003e\n\u003ctd\u003e3.2\u003c\/td\u003e\n\u003ctd\u003e3.5\u003c\/td\u003e\n\u003ctd\u003e6.5\u003c\/td\u003e\n\u003ctd\u003e5.3\u003c\/td\u003e\n\u003ctd\u003e9\u003c\/td\u003e\n\u003ctd\u003e0.3\u003c\/td\u003e\n\u003ctd\u003e0.4\u003c\/td\u003e\n\u003ctd\u003e0.025\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM3.5\u003c\/td\u003e\n\u003ctd\u003e3.5\u003c\/td\u003e\n\u003ctd\u003e3.7\u003c\/td\u003e\n\u003ctd\u003e4.0\u003c\/td\u003e\n\u003ctd\u003e7.5\u003c\/td\u003e\n\u003ctd\u003e6.0\u003c\/td\u003e\n\u003ctd\u003e9\u003c\/td\u003e\n\u003ctd\u003e0.3\u003c\/td\u003e\n\u003ctd\u003e0.4\u003c\/td\u003e\n\u003ctd\u003e0.04\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM4\u003c\/td\u003e\n\u003ctd\u003e4\u003c\/td\u003e\n\u003ctd\u003e4.3\u003c\/td\u003e\n\u003ctd\u003e4.6\u003c\/td\u003e\n\u003ctd\u003e8.0\u003c\/td\u003e\n\u003ctd\u003e6.5\u003c\/td\u003e\n\u003ctd\u003e11\u003c\/td\u003e\n\u003ctd\u003e0.4\u003c\/td\u003e\n\u003ctd\u003e0.5\u003c\/td\u003e\n\u003ctd\u003e0.06\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM5\u003c\/td\u003e\n\u003ctd\u003e5\u003c\/td\u003e\n\u003ctd\u003e5.3\u003c\/td\u003e\n\u003ctd\u003e5.6\u003c\/td\u003e\n\u003ctd\u003e9.5\u003c\/td\u003e\n\u003ctd\u003e7.7\u003c\/td\u003e\n\u003ctd\u003e11\u003c\/td\u003e\n\u003ctd\u003e0.5\u003c\/td\u003e\n\u003ctd\u003e0.6\u003c\/td\u003e\n\u003ctd\u003e0.1\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM6\u003c\/td\u003e\n\u003ctd\u003e6\u003c\/td\u003e\n\u003ctd\u003e6.4\u003c\/td\u003e\n\u003ctd\u003e6.8\u003c\/td\u003e\n\u003ctd\u003e11.5\u003c\/td\u003e\n\u003ctd\u003e9.3\u003c\/td\u003e\n\u003ctd\u003e14\u003c\/td\u003e\n\u003ctd\u003e0.5\u003c\/td\u003e\n\u003ctd\u003e0.6\u003c\/td\u003e\n\u003ctd\u003e0.17\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM7\u003c\/td\u003e\n\u003ctd\u003e7\u003c\/td\u003e\n\u003ctd\u003e7.4\u003c\/td\u003e\n\u003ctd\u003e7.8\u003c\/td\u003e\n\u003ctd\u003e13.0\u003c\/td\u003e\n\u003ctd\u003e10.5\u003c\/td\u003e\n\u003ctd\u003e14\u003c\/td\u003e\n\u003ctd\u003e0.5\u003c\/td\u003e\n\u003ctd\u003e0.6\u003c\/td\u003e\n\u003ctd\u003e0.24\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM8\u003c\/td\u003e\n\u003ctd\u003e8\u003c\/td\u003e\n\u003ctd\u003e8.4\u003c\/td\u003e\n\u003ctd\u003e8.8\u003c\/td\u003e\n\u003ctd\u003e15.0\u003c\/td\u003e\n\u003ctd\u003e12.1\u003c\/td\u003e\n\u003ctd\u003e14\u003c\/td\u003e\n\u003ctd\u003e0.6\u003c\/td\u003e\n\u003ctd\u003e0.8\u003c\/td\u003e\n\u003ctd\u003e0.38\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM10\u003c\/td\u003e\n\u003ctd\u003e10\u003c\/td\u003e\n\u003ctd\u003e10.5\u003c\/td\u003e\n\u003ctd\u003e11.0\u003c\/td\u003e\n\u003ctd\u003e18.0\u003c\/td\u003e\n\u003ctd\u003e14.6\u003c\/td\u003e\n\u003ctd\u003e16\u003c\/td\u003e\n\u003ctd\u003e0.8\u003c\/td\u003e\n\u003ctd\u003e1.0\u003c\/td\u003e\n\u003ctd\u003e0.7\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM12\u003c\/td\u003e\n\u003ctd\u003e12\u003c\/td\u003e\n\u003ctd\u003e13.0\u003c\/td\u003e\n\u003ctd\u003e13.5\u003c\/td\u003e\n\u003ctd\u003e21.0\u003c\/td\u003e\n\u003ctd\u003e17.0\u003c\/td\u003e\n\u003ctd\u003e18\u003c\/td\u003e\n\u003ctd\u003e0.8\u003c\/td\u003e\n\u003ctd\u003e1.0\u003c\/td\u003e\n\u003ctd\u003e0.9\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM14\u003c\/td\u003e\n\u003ctd\u003e14\u003c\/td\u003e\n\u003ctd\u003e15.0\u003c\/td\u003e\n\u003ctd\u003e15.5\u003c\/td\u003e\n\u003ctd\u003e24.0\u003c\/td\u003e\n\u003ctd\u003e19.5\u003c\/td\u003e\n\u003ctd\u003e18\u003c\/td\u003e\n\u003ctd\u003e0.8\u003c\/td\u003e\n\u003ctd\u003e1.0\u003c\/td\u003e\n\u003ctd\u003e1.2\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM16\u003c\/td\u003e\n\u003ctd\u003e16\u003c\/td\u003e\n\u003ctd\u003e17.0\u003c\/td\u003e\n\u003ctd\u003e17.5\u003c\/td\u003e\n\u003ctd\u003e27.0\u003c\/td\u003e\n\u003ctd\u003e21.9\u003c\/td\u003e\n\u003ctd\u003e18\u003c\/td\u003e\n\u003ctd\u003e1.0\u003c\/td\u003e\n\u003ctd\u003e1.2\u003c\/td\u003e\n\u003ctd\u003e1.9\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM18\u003c\/td\u003e\n\u003ctd\u003e18\u003c\/td\u003e\n\u003ctd\u003e19.0\u003c\/td\u003e\n\u003ctd\u003e19.5\u003c\/td\u003e\n\u003ctd\u003e30.0\u003c\/td\u003e\n\u003ctd\u003e24.4\u003c\/td\u003e\n\u003ctd\u003e18\u003c\/td\u003e\n\u003ctd\u003e1.0\u003c\/td\u003e\n\u003ctd\u003e1.2\u003c\/td\u003e\n\u003ctd\u003e2.3\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM20\u003c\/td\u003e\n\u003ctd\u003e20\u003c\/td\u003e\n\u003ctd\u003e21.0\u003c\/td\u003e\n\u003ctd\u003e21.5\u003c\/td\u003e\n\u003ctd\u003e33.0\u003c\/td\u003e\n\u003ctd\u003e26.8\u003c\/td\u003e\n\u003ctd\u003e20\u003c\/td\u003e\n\u003ctd\u003e1.0\u003c\/td\u003e\n\u003ctd\u003e1.2\u003c\/td\u003e\n\u003ctd\u003e3.0\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM22\u003c\/td\u003e\n\u003ctd\u003e22\u003c\/td\u003e\n\u003ctd\u003e23.0\u003c\/td\u003e\n\u003ctd\u003e23.5\u003c\/td\u003e\n\u003ctd\u003e36.0\u003c\/td\u003e\n\u003ctd\u003e29.3\u003c\/td\u003e\n\u003ctd\u003e20\u003c\/td\u003e\n\u003ctd\u003e1.0\u003c\/td\u003e\n\u003ctd\u003e1.2\u003c\/td\u003e\n\u003ctd\u003e3.7\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM24\u003c\/td\u003e\n\u003ctd\u003e24\u003c\/td\u003e\n\u003ctd\u003e25.0\u003c\/td\u003e\n\u003ctd\u003e25.5\u003c\/td\u003e\n\u003ctd\u003e39.0\u003c\/td\u003e\n\u003ctd\u003e31.7\u003c\/td\u003e\n\u003ctd\u003e20\u003c\/td\u003e\n\u003ctd\u003e1.2\u003c\/td\u003e\n\u003ctd\u003e1.5\u003c\/td\u003e\n\u003ctd\u003e5.5\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM27\u003c\/td\u003e\n\u003ctd\u003e27\u003c\/td\u003e\n\u003ctd\u003e28.0\u003c\/td\u003e\n\u003ctd\u003e28.5\u003c\/td\u003e\n\u003ctd\u003e44.0\u003c\/td\u003e\n\u003ctd\u003e35.8\u003c\/td\u003e\n\u003ctd\u003e20\u003c\/td\u003e\n\u003ctd\u003e1.2\u003c\/td\u003e\n\u003ctd\u003e1.5\u003c\/td\u003e\n\u003ctd\u003e7.0\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eM30\u003c\/td\u003e\n\u003ctd\u003e30\u003c\/td\u003e\n\u003ctd\u003e31.0\u003c\/td\u003e\n\u003ctd\u003e31.5\u003c\/td\u003e\n\u003ctd\u003e47.0\u003c\/td\u003e\n\u003ctd\u003e38.2\u003c\/td\u003e\n\u003ctd\u003e20\u003c\/td\u003e\n\u003ctd\u003e1.2\u003c\/td\u003e\n\u003ctd\u003e1.5\u003c\/td\u003e\n\u003ctd\u003e8.0\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cem\u003eAll dimensions in mm per DIN 6798 Form J. d1 = inner diameter; d2 = outer diameter; d3 = serration root diameter; s = thickness.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eDIN 6798 Form J vs. Form A vs. Form V — Key Differences\u003c\/h2\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eFeature\u003c\/th\u003e\n\u003cth\u003eForm J (Internal)\u003c\/th\u003e\n\u003cth\u003eForm A (External)\u003c\/th\u003e\n\u003cth\u003eForm V (Countersunk)\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eSerration location\u003c\/td\u003e\n\u003ctd\u003eInner diameter\u003c\/td\u003e\n\u003ctd\u003eOuter diameter\u003c\/td\u003e\n\u003ctd\u003eOuter diameter, countersunk\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eBites into\u003c\/td\u003e\n\u003ctd\u003eFastener shank \/ bolt\u003c\/td\u003e\n\u003ctd\u003eSubstrate surface\u003c\/td\u003e\n\u003ctd\u003eSubstrate surface (countersunk)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eOuter surface\u003c\/td\u003e\n\u003ctd\u003ePreserved — no marking\u003c\/td\u003e\n\u003ctd\u003eMarked by teeth\u003c\/td\u003e\n\u003ctd\u003eFlush with surface\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eTypical use\u003c\/td\u003e\n\u003ctd\u003eWhere outer appearance must be preserved\u003c\/td\u003e\n\u003ctd\u003eGeneral anti-loosening\u003c\/td\u003e\n\u003ctd\u003eCountersunk screw assemblies\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eMaterial \u0026amp; Mechanical Properties — A2 Stainless Steel (SUS304)\u003c\/h2\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eProperty\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eMaterial Grade\u003c\/td\u003e\n\u003ctd\u003eA2 \/ SUS304 \/ 1.4301 \/ 0Cr18Ni9\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eCr Content\u003c\/td\u003e\n\u003ctd\u003e17.5 – 19.5%\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eNi Content\u003c\/td\u003e\n\u003ctd\u003e8.0 – 10.5%\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eSurface Treatment\u003c\/td\u003e\n\u003ctd\u003eWhitened \u0026amp; Passivated\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eMagnetic\u003c\/td\u003e\n\u003ctd\u003eNon-magnetic (austenitic)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eOperating Temperature\u003c\/td\u003e\n\u003ctd\u003e-196°C to +300°C\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eCorrosion Resistance\u003c\/td\u003e\n\u003ctd\u003eExcellent — atmospheric, fresh water, mild chemicals\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eRoHS \/ REACH\u003c\/td\u003e\n\u003ctd\u003eCompliant\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eHow Internal Serrated Lock Washers Work\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInternal serrations:\u003c\/strong\u003e Sharp teeth on the inner diameter bite into the fastener shank or the underside of the bolt head as the fastener is tightened\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMechanical engagement:\u003c\/strong\u003e The teeth create a positive mechanical lock that resists rotation under vibration and dynamic loads\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOuter surface preserved:\u003c\/strong\u003e Because the teeth are on the inner diameter, the outer surface of the substrate is not marked — ideal for visible or finished surfaces\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHigher tooth count:\u003c\/strong\u003e Internal serrations typically have more teeth per unit circumference than external serrations, providing finer engagement\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eApplication Scenarios\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eVisible or finished surfaces\u003c\/strong\u003e — internal teeth preserve outer substrate appearance\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFood \u0026amp; beverage processing equipment\u003c\/strong\u003e — A2 stainless, food-safe, easy to clean\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMedical \u0026amp; pharmaceutical equipment\u003c\/strong\u003e — non-magnetic, corrosion-free\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eElectronics \u0026amp; electrical enclosures\u003c\/strong\u003e — non-magnetic, reliable anti-loosening\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOutdoor \u0026amp; architectural hardware\u003c\/strong\u003e — excellent atmospheric corrosion resistance\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAutomotive \u0026amp; transportation\u003c\/strong\u003e — vibration resistance in corrosive environments\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMarine \u0026amp; coastal installations\u003c\/strong\u003e — A2 stainless for general corrosion protection\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eProduct Photo Gallery\u003c\/h2\u003e\n\u003cp\u003eFULLERKREG DIN 6798J Internal Serrated Lock Washer, A2 Stainless Steel:\u003c\/p\u003e\n\u003ctable\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"width:25%;text-align:center;padding:12px\"\u003e[ Photo 1 ]\u003c\/td\u003e\n      \u003ctd style=\"width:25%;text-align:center;padding:12px\"\u003e[ Photo 2 ]\u003c\/td\u003e\n      \u003ctd style=\"width:25%;text-align:center;padding:12px\"\u003e[ Photo 3 ]\u003c\/td\u003e\n      \u003ctd style=\"width:25%;text-align:center;padding:12px\"\u003e[ Photo 4 ]\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eWhy Choose FULLERKREG?\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e🏭 \u003cstrong\u003eDirect manufacturer\u003c\/strong\u003e — factory in China, no middlemen\u003c\/li\u003e\n  \u003cli\u003e📐 \u003cstrong\u003eStrict DIN dimensional control\u003c\/strong\u003e — 100% inspection on critical dimensions\u003c\/li\u003e\n  \u003cli\u003e🌍 \u003cstrong\u003eGlobal export experience\u003c\/strong\u003e — serving distributors in Europe, North America, Southeast Asia\u003c\/li\u003e\n  \u003cli\u003e📦 \u003cstrong\u003eFlexible MOQ\u003c\/strong\u003e — small trial orders and large bulk shipments both welcome\u003c\/li\u003e\n  \u003cli\u003e📋 \u003cstrong\u003eFull documentation\u003c\/strong\u003e — material certs, RoHS declarations, test reports available\u003c\/li\u003e\n  \u003cli\u003e⚡ \u003cstrong\u003eFast lead times\u003c\/strong\u003e — standard sizes in stock, ready to ship\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 DIN 6798 Form J?\u003c\/strong\u003e\u003cbr\u003e\nA: DIN 6798 Form J is an internal serrated lock washer. The serrations (teeth) are on the inner diameter and bite into the fastener shank or bolt head underside when tightened, providing mechanical anti-loosening without marking the outer substrate surface.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What is the difference between Form J (internal) and Form A (external)?\u003c\/strong\u003e\u003cbr\u003e\nA: Form J has teeth on the inner diameter — they bite into the fastener, preserving the outer substrate surface. Form A has teeth on the outer diameter — they bite into the substrate surface. Choose Form J when the outer appearance of the assembly must be preserved.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Is A2 stainless steel food-safe?\u003c\/strong\u003e\u003cbr\u003e\nA: Yes. A2 (SUS304) is widely used in food processing and pharmaceutical equipment. Non-toxic, easy to clean, resistant to most food-contact environments.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Do you provide material test certificates?\u003c\/strong\u003e\u003cbr\u003e\nA: Yes. Mill certificates, chemical composition reports, and dimensional inspection reports are available upon request.\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003cp\u003e\u003cstrong\u003eFULLERKREG Fasteners\u003c\/strong\u003e — Precision DIN Standard Fasteners, Direct from Manufacturer.\u003cbr\u003e\nFor wholesale inquiries, technical questions, or custom orders, please contact our sales team.\u003c\/p\u003e","products":[],"url":"https:\/\/www.fullerkr.com\/collections\/din-6798j-a2-stainless-internal-serrated.oembed","provider":"Fullerkreg Fasteners","version":"1.0","type":"link"}