{"product_id":"value-collection-zmschb90260-nbr-backup-o-ring-dash-8-260","title":"Value Collection ZMSCHB90260 Nbr Backup O-ring Dash 8-260","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe VALUE COLLECTION ZMSCHB90260 is a rectangular cross-section backup O-ring made from Nitrile Butadiene Rubber (NBR), sold in a pack of 5. It carries a Dash 8-260 designation and measures 6.518 inches inside diameter by 6.756 inches outside diameter, with a thickness of 0.0468 inches. Rated at 90 durometer, this extra-hard backup ring is engineered to prevent extrusion of primary O-rings under pressure in dynamic and static sealing applications. The NBR compound provides solid resistance to petroleum-based fluids, hydraulic oils, and fuels across a working temperature range of -40 to 250 degrees F. Licensed plumbers, hydraulic system technicians, and industrial maintenance professionals install this type of backup ring as part of a complete seal assembly.\u003c\/p\u003e\u003cp\u003eThis backup ring is suited for high-pressure sealing assemblies where a primary O-ring requires lateral support to prevent blowout or extrusion into clearance gaps. Typical applications include hydraulic cylinders, fluid power components, pneumatic actuators, and industrial plumbing connections where a Dash 8-260 size is specified. The rectangular cross section seats flush against the primary seal, making it compatible with standard O-ring gland geometries designed for backup ring use. Each order ships as a pack of 5 rings.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eDash 8-260 designation for straightforward cross-reference with standard O-ring size charts\u003c\/li\u003e\n\u003cli\u003eRectangular cross section prevents primary O-ring extrusion under elevated pressure\u003c\/li\u003e\n\u003cli\u003e90 durometer extra-hard NBR compound resists petroleum-based oils, hydraulic fluid, and fuels\u003c\/li\u003e\n\u003cli\u003eOperating temperature range of -40 to 250 degrees F suits a wide range of industrial and fluid power environments\u003c\/li\u003e\n\u003cli\u003e6.518 inches ID and 6.756 inches OD provide a precise fit in standard Dash 8-260 glands\u003c\/li\u003e\n\u003cli\u003ePack of 5 rings per order supports service stock and field repair kits\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as a standard Dash 8-260 backup O-ring for use in hydraulic, pneumatic, and fluid power sealing assemblies that require a rectangular-section backup ring alongside a primary O-ring seal.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation is typically performed by hydraulic technicians, licensed plumbers, or industrial maintenance personnel. Depressurize and isolate the system completely before disassembling any seal gland. Inspect the gland groove for scoring or debris before seating the backup ring, and install the backup ring on the low-pressure side of the primary O-ring. Do not stretch the backup ring beyond the minimum required to seat it, as distortion can compromise sealing performance.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eInside Diameter\u003c\/strong\u003e: 6.518 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutside Diameter\u003c\/strong\u003e: 6.756 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThickness\u003c\/strong\u003e: 0.0468 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDash Number\u003c\/strong\u003e: 8-260\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\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: 5\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.01 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: ZMSCHB90260\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"VALUE COLLECTION","offers":[{"title":"Default Title","offer_id":51701818687794,"sku":"ZMSCHB90260","price":21.2,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/9d2c620055b017b240289fb1457b56cf.jpg?v=1788405476","url":"https:\/\/voomisupply.com\/products\/value-collection-zmschb90260-nbr-backup-o-ring-dash-8-260","provider":"Voomi Supply","version":"1.0","type":"link"}