{"product_id":"mr-o-ring-221-epdm-o-ring-70a-durometer-1-7-16-in-id-pack-of-100","title":"Mr O-Ring 221 EPDM O-Ring 70A Durometer 1-7\/16 in ID Pack of 100","description":"\u003cp\u003eIn this review the Mr O-Ring 221 EPDM o-ring pack is examined for workshop and maintenance use; it is aimed at technicians, hobbyists and equipment owners who need a reliable, weather-resistant seal in bulk. The single biggest reason to buy is the combination of a common AS568-equivalent size and EPDM compound properties - the 70A durometer gives a balance of flexibility and durability while the pack of 100 reduces downtime for routine replacement. The review focuses on real-world sealing, temperature tolerance and chemical compatibility.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e221 EPDM formulation:\u003c\/strong\u003e provides strong resistance to ozone, sunlight and weathering so seals last outdoors and in exposed installations.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e70A Durometer:\u003c\/strong\u003e offers a balanced hardness that retains flexibility at low temperatures while resisting extrusion in static and dynamic seals.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePack of 100:\u003c\/strong\u003e a large quantity reduces reordering frequency and is convenient for shops and preventive maintenance programs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWide temperature range:\u003c\/strong\u003e rated from -55C to 125C so the o-ring works across cold storage, engine bays and many industrial environments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChemical compatibility:\u003c\/strong\u003e performs well with water, alcohols, brake fluid, dilute acids and alkalies and some hydraulic fluids for broad application coverage.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAS568 size equivalent:\u003c\/strong\u003e nominal and actual dimensions match common sizing for straightforward replacement and interchangeability.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWho It's For\u003c\/h2\u003e\u003cp\u003eThis product is best for maintenance teams, small repair shops and DIY technicians who need a consistent supply of a common EPDM o-ring size for plumbing, HVAC, automotive non-fuel systems and general sealing tasks. The bulk pack is useful where multiple replacements are expected or where stocking spare parts prevents downtime.\u003c\/p\u003e\u003cp\u003eThose who need resistance to petroleum-based oils, aggressive hydrocarbons or certain silicone fluids should look elsewhere, because EPDM is not recommended for many fuels and some nonpolar solvents. If you need a softer or much harder durometer, a different compound or specific material certification may be required.\u003c\/p\u003e\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eExcellent resistance to ozone, sunlight and weathering for outdoor and exposed seals.\u003c\/li\u003e\n\u003cli\u003eGood low temperature flexibility and a practical 70A hardness for many sealing tasks.\u003c\/li\u003e\n\u003cli\u003eLarge 100-count pack is cost-effective for workshops and routine maintenance.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\u003cli\u003eEPDM is not suitable for many petroleum-based fluids, so it is not universal for all automotive seals.\u003c\/li\u003e\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eEPDM (221)\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\u003e1-7\/16 in ID, 1-11\/16 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\u003e1.421 in ID, 1.699 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\u003e36.09 mm ID, 43.15 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 resistance to 204.4C (400F)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePack size\u003c\/td\u003e\n\u003ctd\u003e100 pieces\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch2\u003eOur Verdict\u003c\/h2\u003e\u003cp\u003eThe Mr O-Ring 221 EPDM 70A pack is a practical choice for anyone needing a dependable, weather-resistant o-ring in a common size and in quantity. It represents good value for preventive maintenance and general sealing where EPDM compatibility is acceptable, but avoid it for petroleum-based fluid applications.\u003c\/p\u003e\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eAre these o-rings AS568-compliant?\u003c\/strong\u003e\u003cbr\u003eThey match AS568 nominal sizing and actual dimensions for direct replacement in most applications.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill these work with engine oil or fuel?\u003c\/strong\u003e\u003cbr\u003eNo, EPDM is generally not compatible with petroleum-based oils and fuels; choose a different material for those fluids.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan they handle steam and high temperature briefly?\u003c\/strong\u003e\u003cbr\u003eYes, EPDM has steam resistance up to about 204.4C (400F) for short exposures, while continuous service is rated to 125C (257F).\u003c\/p\u003e","brand":"Mr O-Ring","offers":[{"title":"Default Title","offer_id":48185213386971,"sku":"B07R74W3V5","price":35.19,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/51Kuv29LevL._SL1000_d501cf79-ec0c-4372-90a4-ad15f2f1ce6d.jpg?v=1769514927","url":"https:\/\/gearmusthave.com\/products\/mr-o-ring-221-epdm-o-ring-70a-durometer-1-7-16-in-id-pack-of-100","provider":"GearMustHave","version":"1.0","type":"link"}