{"product_id":"lasbricka-tandad-a2-din-6798","title":"Internal tooth lock washer | A2 | DIN 6798","description":"\u003cp\u003eDo you need a lock washer that provides secure fastening even under vibration? The \u003cstrong\u003eInternal Tooth Lock Washer A2 DIN 6798 J\u003c\/strong\u003e in stainless steel (A2 \/ AISI 304) is designed to create friction and locking action in screw joints. The internally positioned teeth are pressed into the substrate or the nut's contact surface, thereby preventing the joint from loosening. Thanks to the stainless steel, you get a washer with good corrosion resistance that lasts a long time in both indoor and outdoor environments.\u003c\/p\u003e\n\u003ch2\u003eAREA OF USE\u003c\/h2\u003e\n\u003cp\u003ePerfect for fastenings exposed to movement and vibration in \u003cstrong\u003econstruction, industry, mechanical engineering, and general outdoor use\u003c\/strong\u003e. The serrated design makes the lock washer easy to install and provides a self-locking effect without the need for additional locking elements.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWatch video:\u003c\/strong\u003e \u003ca href=\"https:\/\/youtube.com\/shorts\/9T4NSSIyFeM\" target=\"_blank\" rel=\"noopener\"\u003eWhich washer should you choose?\u003c\/a\u003e\u003c\/p\u003e\n\u003ch2\u003eTECHNICAL SPECIFICATIONS\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eProduct type:\u003c\/strong\u003e Serrated lock washer\u003cbr\u003e\u003cstrong\u003eStandard:\u003c\/strong\u003e DIN 6798 form J (internal teeth)\u003cbr\u003e\u003cstrong\u003eQuality:\u003c\/strong\u003e A2 \/ AISI 304 (stainless steel)\u003cbr\u003e\u003cstrong\u003eMaterial class:\u003c\/strong\u003e Not specified (stainless steel without strength class)\u003cbr\u003e\u003cstrong\u003eThread type:\u003c\/strong\u003e Not applicable\u003cbr\u003e\u003cstrong\u003eSurface treatment:\u003c\/strong\u003e Untreated (natural stainless steel)\u003cbr\u003e\u003cstrong\u003eHead shape:\u003c\/strong\u003e Not applicable\u003cbr\u003e\u003cstrong\u003eGrip type:\u003c\/strong\u003e Not applicable\u003c\/p\u003e\n\u003ch2\u003eFREQUENTLY ASKED QUESTIONS (FAQ)\u003c\/h2\u003e\n\u003ch3\u003eHow does an internal tooth lock washer (DIN 6798 form J) work and when should you choose it?\u003c\/h3\u003e\n\u003cp\u003e\u003cb\u003eDIN 6798 form J\u003c\/b\u003e specifies spring lock washers with the teeth positioned around the inner diameter of the washer:\u003c\/p\u003e\n\u003cul\u003e\n\n\u003cli\u003e\n\n\u003cp\u003e\u003cb\u003eDual locking action (mechanical + spring):\u003c\/b\u003e When the screw or nut is tightened, the teeth spring together while their sharp edges bite into both the underside of the screw head and the substrate.\u003c\/p\u003e\n\n\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cp\u003e\u003cb\u003eSuitable for small screw heads:\u003c\/b\u003e Because the teeth are located close to the hole, they are completely covered even by smaller screw heads, such as socket head cap screws and pan head screws. The smooth outer edge provides a neater installation and does not snag on surrounding materials.\u003c\/p\u003e\n\n\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cp\u003e\u003cb\u003ePrevents self-loosening under vibration:\u003c\/b\u003e Effective in applications exposed to vibrations, shaking, and cyclic movements in machinery, vehicles, and electrical cabinets. Externally toothed washers (form A) provide a slightly higher locking torque but require a larger screw head.\u003c\/p\u003e\n\n\n\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003ch3\u003eWhy is stainless steel A2 (AISI 304) the best material choice for serrated washers?\u003c\/h3\u003e\n\u003cp\u003eSince serrated washers penetrate the surface of the contact material to lock, high demands are placed on corrosion protection:\u003c\/p\u003e\n\u003cul\u003e\n\n\u003cli\u003e\n\n\u003cp\u003e\u003cb\u003eNo surface coating that can be damaged:\u003c\/b\u003e On zinc-plated lock washers, the zinc layer is broken when the teeth bite into the material, which quickly leads to surface rust. A2 steel (1.4301 \/ AISI 304) is solid stainless steel and preserves its protection regardless of surface damage.\u003c\/p\u003e\n\n\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cp\u003e\u003cb\u003eElectrical grounding and contact:\u003c\/b\u003e Frequently used in electrical installations where the teeth penetrate oxide and paint layers to ensure good electrical contact and grounding without risk of corrosion.\u003c\/p\u003e\n\n\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cp\u003e\u003cb\u003eGood spring elasticity:\u003c\/b\u003e A2 steel in the correct hardness class retains its resilience over time and does not dry out or become brittle due to temperature fluctuations.\u003c\/p\u003e\n\n\n\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003ch3\u003eWhat should be kept in mind regarding installation and substrate?\u003c\/h3\u003e\n\u003col start=\"1\"\u003e\n\n\u003cli\u003e\n\n\u003cp\u003e\u003cb\u003eBest suited for flat contact surfaces:\u003c\/b\u003e Place the washer directly under a hex bolt (DIN 933), socket head cap screw (DIN 912), or hex nut (DIN 934) where the underside of the screw head completely covers the washer's teeth.\u003c\/p\u003e\n\n\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cp\u003e\u003cb\u003eAvoid on hardened surfaces:\u003c\/b\u003e The teeth must be able to penetrate the substrate slightly to provide maximum locking effect. On extremely hard surfaces (e.g., hardened steel), the mechanical bite does not work in the same way; wedge-locking washers are recommended there instead.\u003c\/p\u003e\n\n\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cp\u003e\u003cb\u003eSingle use for critical locking:\u003c\/b\u003e For maximum safety in critical joints, serrated lock washers should be replaced when the joint is dismantled, as the sharp edges of the teeth are slightly deformed during the first tightening.\u003c\/p\u003e\n\n\n\u003c\/li\u003e\n\n\n\u003c\/ol\u003e","brand":"WASI","offers":[{"title":"M3","offer_id":49363923599702,"sku":"101329","price":0.2,"currency_code":"SEK","in_stock":true},{"title":"M4","offer_id":49363923665238,"sku":"101330","price":0.25,"currency_code":"SEK","in_stock":true},{"title":"M5","offer_id":49363923632470,"sku":"101331","price":0.3,"currency_code":"SEK","in_stock":true},{"title":"M6","offer_id":49363882279254,"sku":"101332","price":0.35,"currency_code":"SEK","in_stock":true},{"title":"M8","offer_id":49363882312022,"sku":"101333","price":0.5,"currency_code":"SEK","in_stock":true},{"title":"M10","offer_id":49363882344790,"sku":"101334","price":0.7,"currency_code":"SEK","in_stock":true},{"title":"M12","offer_id":49363882377558,"sku":"","price":0.8,"currency_code":"SEK","in_stock":false},{"title":"M14","offer_id":49363882410326,"sku":"101336","price":1.2,"currency_code":"SEK","in_stock":true},{"title":"M16","offer_id":49363882443094,"sku":"","price":1.3,"currency_code":"SEK","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0776\/7864\/1494\/files\/rostfri-nu-internal-tooth-lock-washers.jpg?v=1786182225","url":"https:\/\/rostfri.nu\/en\/products\/lasbricka-tandad-a2-din-6798","provider":"Rostfri.nu","version":"1.0","type":"link"}