{"product_id":"gibraltar-z9131-extra-thick-flat-washer-3-8-in-18-8-ss","title":"Gibraltar Z9131 Extra Thick Flat Washer 3\/8 in 18-8 Ss","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe GIBRALTAR Z9131 is an extra thick flat washer designed for use with 3\/8-inch fasteners in applications that require added load distribution and corrosion resistance. Constructed from Grade 18-8 stainless steel with a plain finish, this washer delivers reliable performance in wet, outdoor, and corrosive environments where standard-thickness washers may not provide sufficient bearing surface. With an inside diameter of 13\/32 inches, an outside diameter of 13\/16 inches, and a thickness of 1\/8 inch, it offers a sturdy bearing surface suitable for demanding mechanical and structural fastening tasks. Plumbers, electricians, HVAC technicians, and general contractors install this type of hardware when securing equipment, panels, or structural components where corrosion resistance and load spreading are required.\u003c\/p\u003e\u003cp\u003eThis washer is suited for residential and commercial applications where 3\/8-inch fasteners are used in environments exposed to moisture or mild chemicals. The extra thick profile makes it appropriate for use with soft substrates, oversized clearance holes, or applications requiring additional clamp load distribution. Common installation scenarios include equipment mounting, pipe support systems, electrical panel attachment, and general mechanical assemblies in both interior and exterior settings.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eExtra thick profile at 1\/8 inch provides greater load distribution than standard flat washers\u003c\/li\u003e\n\u003cli\u003eGrade 18-8 stainless steel construction resists corrosion in wet and outdoor environments\u003c\/li\u003e\n\u003cli\u003eInside diameter of 13\/32 inches fits standard 3\/8-inch fasteners with appropriate clearance\u003c\/li\u003e\n\u003cli\u003eOutside diameter of 13\/16 inches delivers a wide bearing surface for secure clamping\u003c\/li\u003e\n\u003cli\u003ePlain finish maintains material integrity without additional coating that could flake or peel\u003c\/li\u003e\n\u003cli\u003eRockwell hardness rated C36-C42 for consistent mechanical performance under load\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned for use with 3\/8-inch screws and bolts in standard inch-measurement fastener assemblies requiring an extra thick flat washer.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstall using standard hand tools appropriate for the fastener type. Ensure the mating fastener and nut are also stainless steel or a compatible alloy to prevent galvanic corrosion in wet environments. Do not overtighten fasteners, as stainless steel hardware is susceptible to galling. Follow applicable mechanical or structural codes for the specific application and trade discipline involved.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWasher Type\u003c\/strong\u003e: Extra Thick Flat Washer\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eScrew Size\u003c\/strong\u003e: 3\/8 inch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInside Diameter\u003c\/strong\u003e: 13\/32 inches (0.4063 inches)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutside Diameter\u003c\/strong\u003e: 13\/16 inches (0.8125 inches)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThickness\u003c\/strong\u003e: 1\/8 inch (0.1250 inches)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: Stainless Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial Grade\u003c\/strong\u003e: 18-8\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinish\u003c\/strong\u003e: Plain\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHardness\u003c\/strong\u003e: Rockwell C36-C42\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: 0.05 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: Z9131\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"GIBRALTAR","offers":[{"title":"Default Title","offer_id":51698140119346,"sku":"Z9131","price":18.28,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/0a9adb9fc3647f21dbbe9d5b6a2ad9d7.jpg?v=1788358351","url":"https:\/\/voomisupply.com\/products\/gibraltar-z9131-extra-thick-flat-washer-3-8-in-18-8-ss","provider":"Voomi Supply","version":"1.0","type":"link"}