{"product_id":"value-collection-zmsch70428-o-ring-dash-428-nbr-pack-of-5","title":"Value Collection ZMSCH70428 O-ring Dash 428 Nbr Pack of 5","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe VALUE COLLECTION ZMSCH70428 is a Dash 428 Nitrile Butadiene Rubber (NBR) O-ring with a round cross section, supplied in a pack of 5. It measures 4.875 inches inside diameter, 5.375 inches outside diameter, and 0.25 inches thick, with a Shore A hardness of 70. NBR is the most widely used O-ring elastomer in the trade, valued for its excellent resistance to petroleum-based fluids, strong compression set performance, and solid tear and abrasion resistance. Licensed plumbers, HVAC technicians, and fluid-system mechanics reach for Buna-N O-rings as a reliable general-purpose sealing solution across a broad range of service environments.\u003c\/p\u003e\u003cp\u003eThis O-ring is suited for hydraulic systems, pneumatic assemblies, plumbing connections, and fluid-handling equipment where petroleum-based oils, fuels, or lubricants are present. It is rated for service from -40 degrees F to 250 degrees F, covering most residential and light commercial HVAC, refrigeration, and plumbing applications. The Dash 428 designation follows SAE and MIL-Spec sizing standards, making it straightforward to cross-reference against OEM and aftermarket specifications. Each package contains 5 O-rings for bench stock or field kit replenishment.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eNitrile Butadiene Rubber (Buna-N) construction — excellent resistance to petroleum products, oils, and fuels\u003c\/li\u003e\n\u003cli\u003eDash 428 standard sizing per SAE and MIL-Spec standards\u003c\/li\u003e\n\u003cli\u003eShore A hardness of 70 — rated Hard, balancing sealing compliance with extrusion resistance\u003c\/li\u003e\n\u003cli\u003eOperating temperature range: -40 degrees F to 250 degrees F\u003c\/li\u003e\n\u003cli\u003eRound cross section with strong compression set and tear and abrasion resistance\u003c\/li\u003e\n\u003cli\u003eStore away from direct sunlight, ozone sources, and electrical equipment to preserve elastomer integrity\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eCompatible with systems and assemblies using petroleum-based fluids. Conforms to SAE and MIL-Spec Dash 428 O-ring dimensional standards, allowing direct replacement wherever a Dash 428 NBR O-ring is specified.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eDepressurize and drain the system before removing or installing any O-ring to prevent injury and contamination. Clean the gland groove and mating surfaces before seating the new O-ring, and apply a compatible lubricant to ease installation and reduce the risk of pinching or rolling. Do not install this O-ring in systems containing ozone, strong acids, ketones, or chlorinated solvents, as NBR is not compatible with those media. Installation should be performed by a qualified technician following applicable codes and equipment manufacturer guidelines.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: Nitrile Butadiene Rubber (Buna-N)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDash Number\u003c\/strong\u003e: 428\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInside Diameter\u003c\/strong\u003e: 4.875 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutside Diameter\u003c\/strong\u003e: 5.375 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThickness\u003c\/strong\u003e: 0.25 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCross Section Shape\u003c\/strong\u003e: Round\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShore A Hardness\u003c\/strong\u003e: 70 (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\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\u003ePackage Quantity\u003c\/strong\u003e: 5\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: ZMSCH70428\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"VALUE COLLECTION","offers":[{"title":"Default Title","offer_id":51723415650610,"sku":"ZMSCH70428","price":14.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/d07c30dd8efcd500b8bb1759bdfbae86_7a5edb95-952b-47bc-aeab-0332ae897647.jpg?v=1788604657","url":"https:\/\/voomisupply.com\/products\/value-collection-zmsch70428-o-ring-dash-428-nbr-pack-of-5","provider":"Voomi Supply","version":"1.0","type":"link"}