{"product_id":"value-collection-zmschb90325-nbr-o-ring-backup-ring-90d","title":"Value Collection ZMSCHB90325 Nbr O-ring Backup Ring 90D","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe VALUE COLLECTION ZMSCHB90325 is a rectangular cross-section backup ring designed to prevent O-ring extrusion in high-pressure sealing applications. Made from Nitrile Butadiene Rubber (NBR) with a 90 durometer hardness rating, this part provides an extra-hard barrier that supports the primary O-ring under dynamic or static load. Key dimensions are 1.513 inches inner diameter, 1.879 inches outer diameter, and 0.0625 inches thickness. The operating temperature range runs from -40 degrees F to 250 degrees F, making it suitable for fluid and pneumatic systems that see wide thermal cycling. Plumbers, hydraulic technicians, and mechanical contractors are the primary installers.\u003c\/p\u003e\u003cp\u003eThis backup ring is used in groove-seated sealing assemblies where standard round O-rings require additional support against extrusion through the clearance gap. Typical applications include hydraulic cylinders, pneumatic actuators, fluid control valves, and pump assemblies found in industrial, HVAC, and plumbing systems. The NBR compound resists petroleum-based oils, fuels, and water, which are common media in these environments. Each package contains 25 pieces, and the minimum order quantity is 1 package.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eRectangular cross-section prevents O-ring extrusion under pressure differential\u003c\/li\u003e\n\u003cli\u003e90 durometer extra-hard NBR material for high-load sealing support\u003c\/li\u003e\n\u003cli\u003eOperating range of -40 degrees F to 250 degrees F suits thermally demanding systems\u003c\/li\u003e\n\u003cli\u003eDash 8-325 designation allows direct cross-reference to standard sizing charts\u003c\/li\u003e\n\u003cli\u003eNBR compound compatible with petroleum oils, fuels, water, and many hydraulic fluids\u003c\/li\u003e\n\u003cli\u003ePackaged in quantities of 25 for bench-stock and service van stocking\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as a standard Dash 8-325 backup ring for use alongside O-rings in rectangular-groove sealing assemblies across hydraulic, pneumatic, and fluid-handling equipment requiring extra-hard NBR sealing support.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation is typically performed by licensed plumbers, hydraulic technicians, or mechanical contractors. Depressurize and de-energize the system fully before disassembling any sealing joint. Inspect the groove dimensions and clearance gap to confirm the backup ring seats flush without pinching or twisting. Avoid using sharp tools that can nick the rubber surface during installation, as surface damage reduces sealing effectiveness.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: Nitrile Butadiene Rubber (NBR)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInside Diameter\u003c\/strong\u003e: 1.513 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutside Diameter\u003c\/strong\u003e: 1.879 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThickness\u003c\/strong\u003e: 0.0625 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCross Section Shape\u003c\/strong\u003e: Rectangle\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHardness\u003c\/strong\u003e: 90 Durometer (Extra Hard)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDash Number\u003c\/strong\u003e: 8-325\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMinimum Working Temperature\u003c\/strong\u003e: -40 degrees F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Working Temperature\u003c\/strong\u003e: 250 degrees F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFDA Approved\u003c\/strong\u003e: No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Quantity\u003c\/strong\u003e: 25 pieces\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.02 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUNSPSC Code\u003c\/strong\u003e: 31401503\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: VALUE COLLECTION\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: ZMSCHB90325\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"VALUE COLLECTION","offers":[{"title":"Default Title","offer_id":51723627528498,"sku":"ZMSCHB90325","price":14.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/bbbcceebcc98f31c0d76bce29370f44a_90676503-f4d1-4646-870d-704d7247486b.jpg?v=1788607145","url":"https:\/\/voomisupply.com\/products\/value-collection-zmschb90325-nbr-o-ring-backup-ring-90d","provider":"Voomi Supply","version":"1.0","type":"link"}