{"product_id":"value-collection-zmschb90231-backup-ring-o-ring-nbr","title":"Value Collection ZMSCHB90231 Backup Ring O-ring Nbr","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe VALUE COLLECTION ZMSCHB90231 is a rectangular cross-section backup ring O-ring made from Nitrile Butadiene Rubber (NBR). It measures 2.631 inches inner diameter by 2.867 inches outer diameter with a thickness of 0.0468 inches (nominal 3\/64 inch). Rated at 90 durometer, this extra-hard ring is engineered to prevent O-ring extrusion under pressure in high-load sealing applications. It operates across a temperature range of -40 to 250 degrees F, making it suitable for a wide range of fluid and pneumatic systems. Plumbers, HVAC technicians, and industrial maintenance professionals install backup rings alongside primary O-rings to extend seal life in pressurized assemblies. This part is sold in packages of 25.\u003c\/p\u003e\n\u003cp\u003eThis backup ring is used in hydraulic cylinders, pneumatic actuators, fluid fittings, and other dynamic or static sealing applications where standard O-rings require anti-extrusion support. The NBR material provides good resistance to petroleum-based oils, fuels, and many hydraulic fluids, making it a common choice in plumbing, HVAC, and general industrial maintenance. The Dash 8-231 designation corresponds to a standard sizing reference used across trade catalogs and MRO sourcing. Install alongside compatible primary O-rings in grooved gland assemblies requiring rectangular backup ring geometry.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eRectangular cross-section profile designed specifically for backup ring applications to resist O-ring extrusion\u003c\/li\u003e\n  \u003cli\u003e90 durometer extra-hard NBR construction for high-pressure sealing environments\u003c\/li\u003e\n  \u003cli\u003e2.631 inches ID x 2.867 inches OD x 0.0468 inches thick — Dash 8-231 standard sizing\u003c\/li\u003e\n  \u003cli\u003eTemperature rated from -40 to 250 degrees F for broad fluid system compatibility\u003c\/li\u003e\n  \u003cli\u003eNBR material offers resistance to petroleum oils, hydraulic fluids, and fuels\u003c\/li\u003e\n  \u003cli\u003eSold in a package quantity of 25 units\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as a standard Dash 8-231 rectangular backup ring for use in gland assemblies requiring a 2.631 inch ID backup ring with rectangular cross-section geometry. Verify groove dimensions and gland design before installation.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eBackup rings are typically installed by plumbers, hydraulic technicians, or industrial maintenance professionals working on pressurized fluid or pneumatic assemblies. Always depressurize and isolate the system before disassembling any gland or fitting. Inspect the gland groove for damage or contamination before seating the backup ring. Do not stretch or twist the ring during installation; use a clean, smooth installation tool to avoid cutting or deforming the sealing surface.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: Nitrile Butadiene Rubber (NBR)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDash Number\u003c\/strong\u003e: 8-231\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInside Diameter\u003c\/strong\u003e: 2.631 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOutside Diameter\u003c\/strong\u003e: 2.867 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThickness\u003c\/strong\u003e: 0.0468 inches (3\/64 inch nominal)\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\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHardness Rating\u003c\/strong\u003e: Extra Hard\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\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.02 pounds\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eStandard Information\u003c\/h4\u003e\n\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: ZMSCHB90231\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"VALUE COLLECTION","offers":[{"title":"Default Title","offer_id":51720392540466,"sku":"ZMSCHB90231","price":23.53,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/f053da436c491268940de1c7382c18ef.jpg?v=1788563272","url":"https:\/\/voomisupply.com\/products\/value-collection-zmschb90231-backup-ring-o-ring-nbr","provider":"Voomi Supply","version":"1.0","type":"link"}