{"product_id":"value-collection-zmschb90352-o-ring-backup-ring-nbr-90d","title":"Value Collection ZMSCHB90352 O-ring Backup Ring Nbr 90D","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe VALUE COLLECTION ZMSCHB90352 is a rectangular-cross-section backup ring O-ring made from Nitrile Butadiene Rubber (NBR), rated at 90 durometer for extra-hard hardness. It measures 4.903 inches inner diameter, 5.269 inches outer diameter, and 0.0625 inches thick (Dash 8-352). The extra-hard 90-durometer NBR compound resists extrusion under pressure and holds a reliable seal across a wide service temperature range of -40 to 250 degrees F. This part is used by licensed plumbers, HVAC technicians, and industrial maintenance professionals who require a dependable backup ring to prevent O-ring extrusion in dynamic or static sealing applications.\u003c\/p\u003e\u003cp\u003eThis backup ring is suited for hydraulic, pneumatic, and fluid-handling systems where elevated pressures can cause standard O-rings to extrude into clearance gaps. The Dash 8-352 designation corresponds to a standardized sizing convention, making cross-referencing straightforward across equipment platforms. NBR construction provides good resistance to petroleum-based oils, hydraulic fluids, and water, making this ring appropriate for a broad range of industrial and commercial mechanical assemblies. Each package contains 10 rings with a minimum order quantity of 1.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eRectangular cross-section backup ring design prevents primary O-ring extrusion under pressure\u003c\/li\u003e\n\u003cli\u003eNitrile Butadiene Rubber (NBR) material offers solid resistance to petroleum oils and hydraulic fluids\u003c\/li\u003e\n\u003cli\u003e90 durometer extra-hard rating provides firm sealing under high-stress conditions\u003c\/li\u003e\n\u003cli\u003eRated for service from -40 to 250 degrees F, covering most industrial and HVAC fluid system ranges\u003c\/li\u003e\n\u003cli\u003eDash 8-352 standardized sizing for easy cross-referencing and replacement\u003c\/li\u003e\n\u003cli\u003eSold in packages of 10 rings\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as an OEM-style replacement or maintenance stock backup ring for static and dynamic sealing assemblies requiring a Dash 8-352 rectangular NBR ring with a 4.903-inch inner diameter.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation is typically performed by licensed plumbers, HVAC technicians, or industrial mechanics. Depressurize and isolate the system fully before disassembling any fitting or housing. Inspect the groove dimensions to confirm a proper fit before seating the backup ring. Avoid stretching or twisting the ring during installation to prevent deformation that could compromise the seal.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eInner Diameter\u003c\/strong\u003e: 4.903 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOuter Diameter\u003c\/strong\u003e: 5.269 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\u003eMaterial\u003c\/strong\u003e: Nitrile Butadiene Rubber (NBR)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDash Number\u003c\/strong\u003e: 8-352\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurometer\u003c\/strong\u003e: 90 (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: 10\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.03 pounds\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: ZMSCHB90352\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"VALUE COLLECTION","offers":[{"title":"Default Title","offer_id":51699829539122,"sku":"ZMSCHB90352","price":21.38,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/bbbcceebcc98f31c0d76bce29370f44a_265e2607-ef16-4ec8-9754-bc02ca36d989.jpg?v=1788381713","url":"https:\/\/voomisupply.com\/products\/value-collection-zmschb90352-o-ring-backup-ring-nbr-90d","provider":"Voomi Supply","version":"1.0","type":"link"}