{"product_id":"mr-o-ring-336-viton-o-ring-90a-durometer-2-7-8-in-id-pack-of-10","title":"Mr O-Ring 336 Viton O-Ring 90A Durometer, 2-7\/8 in ID (Pack of 10)","description":"\u003cp\u003eIn this review the Mr O-Ring 336 Viton O-Ring is evaluated for technicians and hobbyists who need a reliable, high-temperature seal in fuel, oil, or chemical environments; the single biggest reason to buy is its durable 90A Viton compound that retains sealing properties across a very wide temperature range. The reviewer found these o-rings perform consistently in petroleum and hydraulic applications, and the pack of 10 offers practical value for maintenance or repair work where matching an AS568-equivalent size is important.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Viton (FKM) offers excellent resistance to fuels, oils and many organic solvents, reducing seal degradation in harsh media.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurometer:\u003c\/strong\u003e The 90A hardness provides a firm, resilient seal that resists extrusion and maintains shape under compression.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature range:\u003c\/strong\u003e Rated from -26C (-15F) to 232C (450F), the ring works for high-temperature engine or industrial uses.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e Nominal 2-7\/8 in ID and 3-1\/4 in OD with actual closer tolerances, making it suitable where AS568 size fitment is required.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePack size:\u003c\/strong\u003e Sold in a pack of 10, convenient for repeat servicing and reduces the need to reorder frequently.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChemical resistance:\u003c\/strong\u003e Performs well with petroleum, diesel, biodiesel blends, methanol\/ethanol blends and many oils, extending seal life in aggressive fluids.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWho It's For\u003c\/h2\u003e\u003cp\u003eThe Mr O-Ring 336 Viton is aimed at mechanics, HVAC technicians, industrial maintenance crews and advanced DIYers who need a resilient seal that tolerates high heat and fuel exposure. Anyone replacing or stocking AS568-equivalent o-rings for pumps, valves or fuel system components will appreciate the predictable sizing and material properties.\u003c\/p\u003e\u003cp\u003eThose who need a softer or more flexible seal for very low-temperature applications, or who require a specific proprietary compound or FDA food-grade certification, should look for specialty o-rings designed for those exact environments instead.\u003c\/p\u003e\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eHigh resistance to fuels, oils and many chemicals, so seals last longer in aggressive media.\u003c\/li\u003e\n\u003cli\u003eWide operating temperature range allows use in high-heat engine and industrial settings.\u003c\/li\u003e\n\u003cli\u003eConsistent 90A hardness provides reliable sealing without excessive deformation.\u003c\/li\u003e\n\u003cli\u003ePack of 10 gives good value for routine maintenance needs.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e90A is relatively firm, which may be less ideal for applications that require a softer, low-temperature seal.\u003c\/li\u003e\n\u003cli\u003eNot presented as a food-grade or medical-grade material, so unsuitable where those certifications are required.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eMr O-Ring\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eViton (FKM)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDurometer\u003c\/td\u003e\n\u003ctd\u003e90A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal dimensions (ID x OD x CS)\u003c\/td\u003e\n\u003ctd\u003e2-7\/8 in ID, 3-1\/4 in OD, 3\/16 in CS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eActual dimensions (ID x OD x CS)\u003c\/td\u003e\n\u003ctd\u003e2.850 in ID, 3.270 in OD, 0.210 in CS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMetric dimensions\u003c\/td\u003e\n\u003ctd\u003e72.39 mm ID, 83.05 mm OD, 5.33 mm CS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTemperature range\u003c\/td\u003e\n\u003ctd\u003e-26C (-15F) to 232C (450F)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch2\u003eOur Verdict\u003c\/h2\u003e\u003cp\u003eThe Mr O-Ring 336 in 90A Viton is a solid choice for mechanics and maintenance professionals who need a durable, heat- and fuel-resistant seal in a commonly used size; the pack of 10 and AS568-equivalent dimensions make it practical and cost-effective for routine repairs. It is not intended for applications requiring softer seals or specialty certifications, but for general industrial and automotive sealing it represents good value and dependable performance.\u003c\/p\u003e\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eAre these o-rings compatible with gasoline and diesel?\u003c\/strong\u003e\u003cbr\u003eYes, the Viton compound resists petroleum products, diesel and common fuel blends, making them suitable for fuel system sealing.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDo the dimensions follow a standard size?\u003c\/strong\u003e\u003cbr\u003eYes, the rings meet AS568-equivalent sizing with nominal and actual dimensions provided for accurate fitment.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan these be used at high temperatures?\u003c\/strong\u003e\u003cbr\u003eYes, they are rated to 232C (450F), suitable for many high-temperature engine and industrial applications.\u003c\/p\u003e","brand":"Mr O-Ring","offers":[{"title":"Default Title","offer_id":48641324843227,"sku":"B07R74BZ18","price":45.09,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/51Kuv29LevL._SL1000_29767aae-65d5-4647-85e1-8770508d0a9f.jpg?v=1778535359","url":"https:\/\/gearmusthave.com\/products\/mr-o-ring-336-viton-o-ring-90a-durometer-2-7-8-in-id-pack-of-10","provider":"GearMustHave","version":"1.0","type":"link"}