{"product_id":"gibraltar-z9280-structural-flat-washer-1-1-8-in-alloy-steel","title":"Gibraltar Z9280 Structural Flat Washer 1-1\/8 in Alloy Steel","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe GIBRALTAR Z9280 is a structural flat washer designed for heavy-duty fastening applications requiring load distribution and clamping force under high-tension bolted connections. Manufactured from alloy steel with a zinc yellow dichromate finish, this washer provides corrosion resistance while meeting the hardness demands of structural assemblies. It is sized for a 1-1\/8 inch screw, with an inside diameter of 1-3\/16 inches, an outside diameter of 2-1\/4 inches, and a thickness of 1\/4 inch. The Rockwell C43-C49 hardness rating makes it suitable for structural bolting where softer washers would deform under load. Installers in structural steel, mechanical, and industrial trades rely on this washer where code-compliant joint integrity is required.\u003c\/p\u003e\u003cp\u003eThis washer is used in structural bolted connections across commercial and industrial construction, steel fabrication, heavy equipment assembly, and mechanical installations. Its alloy steel construction and dichromate finish make it appropriate for both indoor and outdoor environments where moderate corrosion resistance is needed alongside high hardness. It suits applications where ASTM or similar structural fastener standards call for hardened washers under bolt heads or nuts.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eAlloy steel construction with Rockwell C43-C49 hardness for structural bolting loads\u003c\/li\u003e\n\u003cli\u003eZinc yellow dichromate finish provides corrosion resistance\u003c\/li\u003e\n\u003cli\u003eInside diameter of 1-3\/16 inches fits 1-1\/8 inch screw size with proper clearance\u003c\/li\u003e\n\u003cli\u003eOutside diameter of 2-1\/4 inches distributes clamping load over a wide bearing surface\u003c\/li\u003e\n\u003cli\u003eThickness of 1\/4 inch provides rigidity under high-tension fastening\u003c\/li\u003e\n\u003cli\u003eInch measurement system for compatibility with standard SAE fastener hardware\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as a structural flat washer for 1-1\/8 inch screw or bolt sizes in heavy-duty mechanical and structural bolting applications.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eStructural flat washers are installed by ironworkers, millwrights, and mechanical contractors working on bolted steel connections. Place the washer under the bolt head or nut before torquing to the specified fastener requirement. Follow applicable structural codes and fastener manufacturer torque specifications for the bolt grade in use. Inspect the washer for deformation or finish damage before installation in corrosive or outdoor environments.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eScrew Size\u003c\/strong\u003e: 1-1\/8 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInside Diameter\u003c\/strong\u003e: 1-3\/16 inches (1.1875 inches)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutside Diameter\u003c\/strong\u003e: 2-1\/4 inches (2.2500 inches)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThickness\u003c\/strong\u003e: 1\/4 inch (0.2500 inches)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: Alloy Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinish\u003c\/strong\u003e: Zinc Yellow Dichromate\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHardness\u003c\/strong\u003e: Rockwell C43-C49\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSystem of Measurement\u003c\/strong\u003e: Inch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.21 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUNSPSC Code\u003c\/strong\u003e: 31161807\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: GIBRALTAR\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: Z9280\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"GIBRALTAR","offers":[{"title":"Default Title","offer_id":51700354941234,"sku":"Z9280","price":16.28,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/9a5e337b27d1e1d1c2f7a4071c6762e3.jpg?v=1788389332","url":"https:\/\/voomisupply.com\/products\/gibraltar-z9280-structural-flat-washer-1-1-8-in-alloy-steel","provider":"Voomi Supply","version":"1.0","type":"link"}