{"product_id":"value-collection-zmschb90350-nbr-o-ring-dash-8-350-90-duro","title":"Value Collection ZMSCHB90350 Nbr O-ring Dash 8-350 90 Duro","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe VALUE COLLECTION ZMSCHB90350 is a rectangular-cross-section nitrile butadiene rubber (NBR) backup ring designed to prevent O-ring extrusion under pressure in hydraulic and pneumatic sealing applications. It measures 4.653 inches inside diameter, 5.019 inches outside diameter, and 0.0625 inches thick. At a 90 durometer hardness rating, this is an extra-hard compound suited for high-pressure systems where a standard O-ring alone may deform or blow out of its groove. Licensed plumbers, hydraulic technicians, and industrial maintenance pros install these as part of a two-piece seal stack. The NBR compound handles a temperature range of -40 to 250 degrees F.\u003c\/p\u003e\n\u003cp\u003eThis backup ring is used wherever an NBR O-ring of the Dash 8-350 size is installed in a high-pressure or dynamic sealing application. Typical installations include hydraulic cylinders, actuators, manifold ports, and large-diameter fluid fittings in industrial, plumbing, and HVAC-adjacent systems. The rectangular cross section seats flush against the low-pressure side of the O-ring groove, blocking extrusion into the clearance gap. It is sold in packages of 10, making it practical to stock for maintenance and repair work.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eRectangular cross section prevents O-ring extrusion on the low-pressure side of the groove\u003c\/li\u003e\n  \u003cli\u003e90 durometer extra-hard NBR compound resists deformation under elevated system pressure\u003c\/li\u003e\n  \u003cli\u003eNBR material compatible with petroleum-based hydraulic fluids, water, and common industrial media\u003c\/li\u003e\n  \u003cli\u003eRated for -40 to 250 degrees F continuous service\u003c\/li\u003e\n  \u003cli\u003eDash 8-350 designation for straightforward cross-reference to groove specifications\u003c\/li\u003e\n  \u003cli\u003ePackaged in quantities of 10 for bench stock and field repair kits\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as a standard Dash 8-350 backup ring for use with matching NBR O-rings in hydraulic, pneumatic, and fluid-sealing assemblies requiring a 4.653 inch inside diameter seal.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation is typically performed by licensed plumbers, hydraulic technicians, or industrial mechanics. Always depressurize and de-energize the system and relieve any stored hydraulic pressure before disassembling seal housings. Backup rings are installed on the downstream or low-pressure side of the O-ring within the groove; incorrect orientation will not provide extrusion protection. Inspect the groove dimensions and surface finish before installation to confirm fit and avoid ring damage during assembly.\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: 8-350\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInside Diameter\u003c\/strong\u003e: 4.653 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOutside Diameter\u003c\/strong\u003e: 5.019 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\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\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: ZMSCHB90350\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"VALUE COLLECTION","offers":[{"title":"Default Title","offer_id":51699316097330,"sku":"ZMSCHB90350","price":17.37,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/a2a901a1b299ef29340057b47c935509.jpg?v=1788374951","url":"https:\/\/voomisupply.com\/products\/value-collection-zmschb90350-nbr-o-ring-dash-8-350-90-duro","provider":"Voomi Supply","version":"1.0","type":"link"}