{"product_id":"value-collection-zmsch70321-o-ring-dash-321-buna-n-70a","title":"Value Collection ZMSCH70321 O-ring Dash 321 Buna-n 70A","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe VALUE COLLECTION ZMSCH70321 is a Dash 321 O-ring made from Nitrile Butadiene Rubber (Buna-N), one of the most widely used elastomers in fluid sealing applications. It measures 1.188 inches inside diameter, 1.563 inches outside diameter, and 0.1875 inches thick with a round cross section. Rated at 70 Shore A hardness, this O-ring delivers reliable compression set resistance along with strong tear and abrasion resistance. It is suited for static and dynamic sealing in systems that handle petroleum-based fluids. Licensed trades including plumbers, HVAC technicians, and fluid-system mechanics regularly specify Buna-N O-rings as primary seals and replacement components.\u003c\/p\u003e\n\u003cp\u003eThis O-ring is intended for use in hydraulic, pneumatic, and fluid-handling assemblies where exposure to petroleum products, oils, and fuels is expected. Its operating temperature range of -40 degrees F to 250 degrees F makes it appropriate for a broad range of residential and commercial service conditions. Grooves machined to standard SAE and MIL-Spec Dash 321 dimensions will accept this O-ring directly. It should not be stored in direct sunlight or near motors and electrical equipment that generate ozone, as ozone exposure degrades Buna-N over time.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eBuna-N (Nitrile Butadiene Rubber) construction — excellent resistance to petroleum products, oils, and fuels\u003c\/li\u003e\n  \u003cli\u003e70 Shore A hardness rating for firm compression set performance\u003c\/li\u003e\n  \u003cli\u003eRound cross section, 0.1875 inches thick, conforming to Dash 321 sizing standard\u003c\/li\u003e\n  \u003cli\u003eOperating range: -40 degrees F to 250 degrees F\u003c\/li\u003e\n  \u003cli\u003eMeets SAE and MIL-Spec standards\u003c\/li\u003e\n  \u003cli\u003eStrong tear and abrasion resistance for dynamic sealing environments\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned for use in any standard Dash 321 O-ring groove machined to SAE or MIL-Spec tolerances. Compatible with petroleum products, hydraulic oils, and fuels. Not recommended for use with ozone-generating environments, strong acids, ketones, or esters.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003ePlumbers, HVAC technicians, and fluid-system mechanics should shut down and depressurize the system completely before replacing any O-ring seal. Inspect the groove for nicks, burrs, or corrosion before installing the new O-ring. Light application of a compatible petroleum-based lubricant eases installation and reduces the risk of pinching or rolling the seal. Follow applicable codes — IPC, IFGC, or equipment OEM service procedures — for reassembly and pressure testing after installation.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\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: 321\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInside Diameter\u003c\/strong\u003e: 1.188 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOutside Diameter\u003c\/strong\u003e: 1.563 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 (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, oils, fuels\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\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: ZMSCH70321\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"VALUE COLLECTION","offers":[{"title":"Default Title","offer_id":51696249307442,"sku":"ZMSCH70321","price":14.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/c328e91227c7a86912ef836b8bdad540.jpg?v=1788340668","url":"https:\/\/voomisupply.com\/products\/value-collection-zmsch70321-o-ring-dash-321-buna-n-70a","provider":"Voomi Supply","version":"1.0","type":"link"}