{"title":"Steel construction washers","description":"\u003cp\u003e\u003cstrong\u003eStainless steel structural washer\u003c\/strong\u003e is used for assembly in steel structures where a heavy-duty washer is required to distribute the load and protect the substrate under high allowable loads.\u003c\/p\u003e\u003cp\u003eAvailable in dimensions according to DIN 7989 for adaptation to heavy-duty screw and bolt connections. Suitable for industrial, construction, and marine environments.\u003c\/p\u003e","products":[{"product_id":"stalbyggnadsbricka-a4-din-7989","title":"Steel construction washer | A4 | DIN 7989","description":"\u003cp\u003eDo you need a \u003cstrong\u003estructural washer\u003c\/strong\u003e that performs safely even in damp, salty, or chemically demanding environments? The \u003cstrong\u003estructural washer DIN 7989 in A4 \/ AISI 316 acid-resistant stainless steel\u003c\/strong\u003e is built to resist corrosion and maintain strength for a long time. Its extra-thick design distributes pressure evenly and reduces the risk of deformation in structural steel. The washer is optimized to withstand heavy mechanical loads and is a reliable choice for fastenings that must hold up even under extreme conditions.\u003c\/p\u003e\n\u003ch2 class=\"MsoNormal\"\u003eFIELD OF APPLICATION\u003c\/h2\u003e\n\u003cp\u003ePerfect for \u003cstrong\u003efastening bolts in steel structures\u003c\/strong\u003e where high forces and long service life are required, for example in \u003cstrong\u003ecoastal areas, marine applications, bridges, boat equipment, and within the food and chemical industries\u003c\/strong\u003e. The robust thickness provides a stable and vibration-proof connection without the need for additional reinforcements. Easy to install with standard tools and requires minimal maintenance even during continuous operation.\u003c\/p\u003e\n\u003ch2 class=\"MsoNormal\"\u003eTECHNICAL SPECIFICATIONS\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eProduct type:\u003c\/strong\u003e Structural washer\u003cbr\u003e\u003cstrong\u003eStandard:\u003c\/strong\u003e DIN 7989-1\u003cbr\u003e\u003cstrong\u003eGrade:\u003c\/strong\u003e A4 \/ AISI 316 (acid-resistant stainless steel)\u003cbr\u003e\u003cstrong\u003eMaterial class:\u003c\/strong\u003e Not specified (depends on execution, typically A4)\u003cbr\u003e\u003cstrong\u003eThread type:\u003c\/strong\u003e Not applicable\u003cbr\u003e\u003cstrong\u003eSurface finish:\u003c\/strong\u003e Untreated (natural stainless steel)\u003cbr\u003e\u003cstrong\u003eHead shape:\u003c\/strong\u003e Round flat washer, extra thick\u003cbr\u003e\u003cstrong\u003eGrip type:\u003c\/strong\u003e Not applicable\u003c\/p\u003e\n\u003ch2\u003eFREQUENTLY ASKED QUESTIONS (FAQ)\u003c\/h2\u003e\n\u003ch3\u003eWhat distinguishes a structural washer according to DIN 7989 from regular washers (DIN 125)?\u003c\/h3\u003e\n\u003cp\u003eDIN 7989 is specially designed for heavy steel and timber structures and has a significant material thickness (often 8 mm thick compared to 1.6–3 mm for standard washers). The heavy-duty design prevents the washer from bowing or deforming under high tightening torques and heavy static loads, which ensures that clamping force is maintained over time.\u003c\/p\u003e\n\u003ch3\u003eWhy is acid-resistant A4 \/ AISI 316 crucial for steel construction in outdoor and industrial environments?\u003c\/h3\u003e\n\u003cp\u003eAcid-resistant A4 steel (AISI 316 \/ 1.4401) contains molybdenum, which provides maximum resistance to stress corrosion and pitting caused by saltwater, road salt, chlorine, and aggressive industrial exhaust gases. This makes the washer ideal for load-bearing structures in coastal construction, bridges, port facilities, and chemical industry or process platforms.\u003c\/p\u003e\n\u003ch3\u003eWhich fasteners should the DIN 7989 washer be combined with for an optimal fastening?\u003c\/h3\u003e\n\u003cp\u003eTo avoid galvanic corrosion and ensure a uniform joint with correct preload, the washer should be used together with screws and nuts of matching \u003cb\u003eacid-resistant A4 grade\u003c\/b\u003e (e.g., hexagon bolt DIN 931\/DIN 933 and hexagon nut DIN 934). At high loads, the washer distributes the pressure over a larger surface area and protects the underlying material against damage during tightening.\u003c\/p\u003e","brand":"WASI","offers":[{"title":"M10","offer_id":51432778301782,"sku":"102180","price":10.0,"currency_code":"SEK","in_stock":true},{"title":"M12","offer_id":51432778334550,"sku":"102181","price":13.3,"currency_code":"SEK","in_stock":true},{"title":"M16","offer_id":51432778367318,"sku":"102182","price":14.5,"currency_code":"SEK","in_stock":true},{"title":"M20","offer_id":51432778400086,"sku":"102183","price":34.2,"currency_code":"SEK","in_stock":true},{"title":"M24","offer_id":51432778432854,"sku":"102184","price":43.9,"currency_code":"SEK","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0776\/7864\/1494\/files\/rostfri-nu-din-7989-steel-construction-washers.jpg?v=1786184323"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0776\/7864\/1494\/collections\/rostfri-nu-din-7989-steel-construction-washers.jpg?v=1790150748","url":"https:\/\/rostfri.nu\/en\/collections\/stalbyggnadsbricka.oembed","provider":"Rostfri.nu","version":"1.0","type":"link"}