{"product_id":"value-collection-zmsch70231-o-ring-dash-231-buna-n-70a","title":"Value Collection ZMSCH70231 O-ring Dash 231 Buna-n 70A","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe VALUE COLLECTION ZMSCH70231 is a Dash 231 O-ring made from Nitrile Butadiene Rubber (Buna-N), the most widely used elastomer in industrial and fluid-system sealing applications. This ring measures 2.625 inches inside diameter, 2.875 inches outside diameter, and 0.125 inches thick with a round cross section. Shore hardness is 70, placing it in the hard hardness rating category. The Buna-N compound delivers excellent resistance to petroleum-based fluids, good compression set performance, and strong tear and abrasion resistance — making it a dependable choice for hydraulic, pneumatic, and fuel-system sealing across HVAC, plumbing, and general mechanical trades.\u003c\/p\u003e\n\u003cp\u003eThis O-ring is suited for static and dynamic sealing applications involving petroleum products, oils, fuels, and hydraulic fluids. The Dash 231 designation follows standard AS568 sizing, allowing straightforward cross-referencing and replacement in grooved-face, radial, or piston sealing configurations. Operating temperature range spans -40 degrees F to 250 degrees F, covering most residential and light commercial mechanical system environments. Installers should avoid storing Buna-N O-rings in direct sunlight or near motors and other electrical equipment that may generate ozone, as ozone accelerates elastomer degradation. This item is sold in a package quantity of 50 rings.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eBuna-N (Nitrile Butadiene Rubber) construction with excellent petroleum-product resistance\u003c\/li\u003e\n  \u003cli\u003eDash 231 standard sizing: 2.625 inches ID x 2.875 inches OD x 0.125 inches thick\u003c\/li\u003e\n  \u003cli\u003e70 Shore A durometer hardness — hard rating for reliable compression set performance\u003c\/li\u003e\n  \u003cli\u003eOperating range of -40 degrees F to 250 degrees F\u003c\/li\u003e\n  \u003cli\u003eRound cross section for consistent groove seating and load distribution\u003c\/li\u003e\n  \u003cli\u003eMeets SAE and MIL-Spec standards\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eCompatible with petroleum products, oils, fuels, and hydraulic fluids. Designed as a standard AS568 Dash 231 replacement O-ring for use in hydraulic, pneumatic, plumbing, and HVAC fluid-handling systems where Buna-N elastomer is specified. Not FDA approved.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eO-rings are typically installed by plumbers, HVAC technicians, and hydraulic system mechanics. Before replacing an O-ring, relieve all system pressure and isolate the fluid supply. Lubricate the O-ring with a compatible fluid or grease prior to installation to reduce the risk of tearing during seating. Inspect the mating groove for nicks or corrosion that could compromise the seal after installation.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInside Diameter\u003c\/strong\u003e: 2.625 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOutside Diameter\u003c\/strong\u003e: 2.875 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThickness\u003c\/strong\u003e: 0.125 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCross Section Shape\u003c\/strong\u003e: Round\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: Nitrile Butadiene Rubber (Buna-N)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eColor\u003c\/strong\u003e: Black\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDash Number\u003c\/strong\u003e: 231\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 Fluids\u003c\/strong\u003e: Petroleum Products\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\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: ZMSCH70231\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"VALUE COLLECTION","offers":[{"title":"Default Title","offer_id":51698233573682,"sku":"ZMSCH70231","price":14.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/cca7cb86ce53331ae2ec014f9da458fe.jpg?v=1788359804","url":"https:\/\/voomisupply.com\/products\/value-collection-zmsch70231-o-ring-dash-231-buna-n-70a","provider":"Voomi Supply","version":"1.0","type":"link"}