{"product_id":"259-epdm-o-ring-70a-durometer-6-1-4-in-id-pack-of-25-reliable-seal","title":"259 EPDM O-Ring 70A Durometer 6-1\/4 in ID Pack of 25 - Reliable Seal","description":"\u003cp\u003eIn this review the 259 EPDM O-Ring (70A durometer, pack of 25) is assessed for workshop and maintenance use; the bottom line is that it is a dependable, general-purpose sealing option for applications exposed to weather, ozone and many common fluids. The reviewer found the nominal 6-1\/4 in ID and 1\/8 in cross-section dimensions to match standard AS568 sizing closely, and its EPDM compound excels where steam resistance, water handling and resistance to dilute acids and alkalies are required, making it a practical choice for technicians who need bulk, consistent sizes for routine service work.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial and hardness:\u003c\/strong\u003e The EPDM compound at 70A durometer provides a good balance of flexibility and resilience for static and low-dynamic seals.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature range:\u003c\/strong\u003e Rated from -55C to 125C, it covers many outdoor and process temperature demands while remaining flexible in cold conditions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChemical compatibility:\u003c\/strong\u003e Performs well with water, alcohols, dilute acids and alkalis, phosphate ester hydraulic fluids and many silicone oils and greases, expanding its practical uses.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize accuracy:\u003c\/strong\u003e Nominal 6-1\/4 in ID, 6-1\/2 in OD and 1\/8 in cross-section closely match the actual measurements for consistent interchange with AS568 sizes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBulk pack:\u003c\/strong\u003e Supplied in packs of 25, which reduces shopping frequency for frequent rebuilds and field spares.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurability:\u003c\/strong\u003e Excellent resistance to ozone, sunlight and weathering means long outdoor storage life and reliable field performance.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWho It's For\u003c\/h2\u003e\u003cp\u003eThis product suits maintenance technicians, plumbers and small shops that require a reliable, weather-resistant sealing option in a common large o-ring size. The pack-of-25 format works well for routine rebuilds, gasket replacement kits and field service trucks where stocking multiple spares is needed.\u003c\/p\u003e\u003cp\u003eIt is less appropriate for precision dynamic rotary seals in aggressive hydrocarbon environments or where specialty elastomers (like fluorocarbon or nitrile with high oil resistance) are required; buyers needing compatibility with strong solvents, fuels or high-pressure rotary shafts should look for a compound rated for those specific fluids.\u003c\/p\u003e\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eGood weather and ozone resistance makes these o-rings suitable for outdoor and aging-prone installations.\u003c\/li\u003e\n\u003cli\u003eSized to AS568-like standards with close actual dimensions for straightforward replacement.\u003c\/li\u003e\n\u003cli\u003eBroad chemical compatibility with water, steam, alcohols and dilute acids allows flexible use across many maintenance tasks.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\u003cli\u003eNot ideal for continuous exposure to strong hydrocarbons or fuels where alternative elastomers would be better.\u003c\/li\u003e\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003e259 EPDM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDurometer\u003c\/td\u003e\n\u003ctd\u003e70A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal dimensions\u003c\/td\u003e\n\u003ctd\u003e6-1\/4 in ID, 6-1\/2 in OD, 1\/8 in CS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eActual dimensions\u003c\/td\u003e\n\u003ctd\u003e6.234 in ID, 6.512 in OD, 0.139 in CS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMetric dimensions\u003c\/td\u003e\n\u003ctd\u003e158.34 mm ID, 165.40 mm OD, 3.53 mm CS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTemperature range\u003c\/td\u003e\n\u003ctd\u003e-55C (-67F) to 125C (257F); steam to 204.4C (400F)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePack size\u003c\/td\u003e\n\u003ctd\u003e25 pieces\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch2\u003eOur Verdict\u003c\/h2\u003e\u003cp\u003eThe 259 EPDM O-Ring 70A in a 25-pack is a practical, cost-effective choice for general sealing tasks where weather resistance and good low-temperature flexibility matter. For general maintenance, plumbing and many hydraulic or steam applications it offers solid value, though installers working with aggressive hydrocarbons should choose a different compound.\u003c\/p\u003e\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eAre these o-rings compatible with petroleum oils?\u003c\/strong\u003e\u003cbr\u003eEPDM is not recommended for prolonged contact with petroleum oils and fuels; for those fluids choose a nitrile or fluorocarbon material.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDo the sizes follow standard AS568 sizing?\u003c\/strong\u003e\u003cbr\u003eYes, the nominal and actual dimensions closely match AS568 259 size standards for straightforward replacements.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow long can these be stored?\u003c\/strong\u003e\u003cbr\u003eEPDM offers excellent resistance to ozone and weathering and the shelf-life is effectively unlimited when stored in cool, dark conditions.\u003c\/p\u003e","brand":"Mr O-Ring","offers":[{"title":"Default Title","offer_id":48636020621531,"sku":"B07R541WDP","price":35.19,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/51Kuv29LevL._SL1000_47494526-87f0-4617-bccd-fe627d4c9d06.jpg?v=1778736464","url":"https:\/\/gearmusthave.com\/products\/259-epdm-o-ring-70a-durometer-6-1-4-in-id-pack-of-25-reliable-seal","provider":"GearMustHave","version":"1.0","type":"link"}