{"product_id":"value-collection-zmsch70311-dash-311-nbr-o-ring-50-pack","title":"Value Collection ZMSCH70311 Dash 311 Nbr O-ring 50 Pack","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe VALUE COLLECTION ZMSCH70311 is a Dash 311 Buna-N O-ring with a round cross section, sold in a package of 50 pieces. Measuring 0.563 inches inside diameter, 0.938 inches outside diameter, and 0.1875 inches thick, this O-ring is molded from nitrile butadiene rubber (NBR) with a Shore A hardness of 70. It is rated for service from -40 degrees F to 250 degrees F and offers reliable sealing performance in systems handling petroleum-based fluids. Licensed plumbers, HVAC technicians, and maintenance professionals commonly stock Dash 311 O-rings for routine service work across hydraulic, pneumatic, and fluid-handling assemblies.\u003c\/p\u003e\u003cp\u003eThis O-ring is suited for use in residential and commercial applications involving petroleum products, hydraulic fluids, and oils. The Buna-N compound delivers strong compression set resistance along with tear and abrasion resistance, making it a dependable choice for dynamic and static sealing applications. It complies with SAE and MIL-Spec standards, supporting use in both general trade and specification-driven maintenance environments. The 50-piece package quantity supports service shops and field technicians who carry inventory for common seal sizes.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eBuna-N (NBR) compound — the most widely used O-ring elastomer for petroleum-fluid compatibility\u003c\/li\u003e\n\u003cli\u003eDash 311 standard sizing: 0.563 inches ID, 0.938 inches OD, 0.1875 inches thick\u003c\/li\u003e\n\u003cli\u003eOperating range of -40 degrees F to 250 degrees F\u003c\/li\u003e\n\u003cli\u003eShore A hardness rating of 70 for a hard, durable cross section\u003c\/li\u003e\n\u003cli\u003eMeets SAE and MIL-Spec standards\u003c\/li\u003e\n\u003cli\u003eRound cross-section profile for consistent groove seating\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eCompatible with petroleum products and petroleum-based hydraulic fluids. Not recommended for use with ozone-generating environments, direct sunlight exposure, or near electrical motors. Not FDA approved. Designed as a standard Dash 311 replacement O-ring for any application requiring this cross-section and nominal sizing.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstall this O-ring only after depressurizing and draining the system being serviced. Lightly lubricate the O-ring with a compatible fluid or O-ring lubricant before seating to reduce the risk of tearing during installation. Avoid rolling or twisting the O-ring into the groove. Plumbers and HVAC technicians should follow applicable system-specific service procedures and local codes when replacing seals in pressurized lines.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: Buna-N (Nitrile Butadiene Rubber)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDash Number\u003c\/strong\u003e: 311\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInside Diameter\u003c\/strong\u003e: 0.563 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutside Diameter\u003c\/strong\u003e: 0.938 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThickness\u003c\/strong\u003e: 0.1875 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCross Section Shape\u003c\/strong\u003e: Round\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHardness\u003c\/strong\u003e: 70 Shore A\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHardness Rating\u003c\/strong\u003e: 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\u003eCompatible Fluid Types\u003c\/strong\u003e: Petroleum Products\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor\u003c\/strong\u003e: Black\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandards\u003c\/strong\u003e: SAE, MIL-Spec\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: 50\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: ZMSCH70311\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"VALUE COLLECTION","offers":[{"title":"Default Title","offer_id":51720524726578,"sku":"ZMSCH70311","price":14.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/de133f1e452331a6bc4c0707eb1f3bf1.jpg?v=1788565515","url":"https:\/\/voomisupply.com\/products\/value-collection-zmsch70311-dash-311-nbr-o-ring-50-pack","provider":"Voomi Supply","version":"1.0","type":"link"}