{"product_id":"value-collection-zmsch70343-o-ring-dash-343-buna-n-70a","title":"Value Collection ZMSCH70343 O-ring Dash 343 Buna-n 70A","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe VALUE COLLECTION ZMSCH70343 is a Dash 343 O-ring made from Nitrile Butadiene Rubber (Buna-N), the most widely used elastomer in industrial and fluid-system sealing applications. It measures 3.75 inches inner diameter by 4.125 inches outer diameter with a 0.1875-inch (3\/16-inch) cross section thickness. The round cross section profile seats consistently in standard O-ring grooves. At a 70 Shore A hardness rating, this ring delivers a firm seal with strong resistance to compression set, tearing, and abrasion. It is suitable for use with petroleum-based fluids and is installed by plumbers, HVAC technicians, and fluid-system mechanics across a wide range of applications.\u003c\/p\u003e\n\u003cp\u003eThis O-ring is used wherever a Dash 343 dimension is specified in hydraulic, pneumatic, fuel, or lubrication systems. Typical applications include pump housings, valve bodies, cylinder heads, and fluid-line fittings that contact petroleum products. The Buna-N compound performs reliably across a temperature range of -40 degrees F to 250 degrees F, making it appropriate for both refrigeration-adjacent mechanical assemblies and standard plumbing or hydraulic circuits. Each package contains 25 rings, suitable for stocking at a service facility or completing a multi-unit repair job.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eBuna-N (Nitrile Butadiene Rubber) compound — excellent resistance to petroleum products, oils, and fuels\u003c\/li\u003e\n  \u003cli\u003e70 Shore A hardness — firm seal with good compression set resistance\u003c\/li\u003e\n  \u003cli\u003eRound cross section — fits standard Dash 343 O-ring grooves without modification\u003c\/li\u003e\n  \u003cli\u003eOperating temperature range: -40 degrees F to 250 degrees F\u003c\/li\u003e\n  \u003cli\u003eTear and abrasion resistant — suitable for dynamic and static sealing applications\u003c\/li\u003e\n  \u003cli\u003eMeets SAE and MIL-Spec standards\u003c\/li\u003e\n  \u003cli\u003ePackage quantity of 25 rings per order unit\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as a direct-dimension replacement for any application specifying a Dash 343 O-ring in Buna-N. Compatible with systems and fluids classified as petroleum products. Not recommended for use with ozone-generating equipment, direct sunlight exposure, or non-petroleum fluid systems without verifying elastomer compatibility.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003ePower down or depressurize the system fully before replacing O-rings in any hydraulic, pneumatic, or fluid-carrying assembly. Inspect the groove for nicks, burrs, or debris before seating the new ring. Lightly lubricate the O-ring with a compatible petroleum-based lubricant to aid installation and prevent pinching or tearing. Do not store unused rings near motors, electrical equipment, or in direct sunlight, as ozone and UV exposure degrade Buna-N over time.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInside Diameter\u003c\/strong\u003e: 3.75 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOutside Diameter\u003c\/strong\u003e: 4.125 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThickness (Cross Section)\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\u003eDash Number\u003c\/strong\u003e: 343\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: Buna-N (Nitrile Butadiene Rubber)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eColor\u003c\/strong\u003e: Black\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: 25\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\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: ZMSCH70343\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"VALUE COLLECTION","offers":[{"title":"Default Title","offer_id":51692625428786,"sku":"ZMSCH70343","price":15.38,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/15a5d4d7642376335934b7cf52dc5ba6.jpg?v=1788300192","url":"https:\/\/voomisupply.com\/products\/value-collection-zmsch70343-o-ring-dash-343-buna-n-70a","provider":"Voomi Supply","version":"1.0","type":"link"}