{"product_id":"mr-o-ring-343-viton-o-ring-90a-durometer-pack-of-10-high-temp-seal","title":"Mr O-Ring 343 Viton O-Ring 90A Durometer Pack of 10 - High Temp Seal","description":"\u003cp\u003eIn this review the Mr O-Ring 343 Viton O-Ring (pack of 10) is assessed for professionals and DIYers who need a durable, high-temperature seal. The bottom line: this Viton (FKM) o-ring is best for applications exposed to fuels, mineral oils, high heat and harsh environments because of its \u003cstrong\u003e90A durometer\u003c\/strong\u003e hardness and broad temperature range. Practical measurements and AS568 sizing make it straightforward to replace common seals, and the 10-pack offers immediate spare parts without guessing compatibility.\u003c\/p\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Viton (FKM) construction provides excellent resistance to fuels, oils and many solvents, so it holds up in aggressive chemical environments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHardness:\u003c\/strong\u003e The 90A durometer gives a firm, reliable seal that resists extrusion and deformation under pressure for consistent performance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature range:\u003c\/strong\u003e Rated from -26C (-15F) to 232C (450F), allowing use in both cold storage and very high temperature air systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensional accuracy:\u003c\/strong\u003e Nominal and actual dimensions are provided so users can match by fit: 3-3\/4 in ID nominal with actual 3.725 in ID for proper replacements.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePack quantity:\u003c\/strong\u003e Sold as a pack of 10, which is convenient for maintenance shops or repeated repairs without reordering.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandards:\u003c\/strong\u003e Sized to meet AS568 standards, simplifying selection for common industry sealing tasks.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThis o-ring is aimed at mechanics, maintenance technicians and hobbyists who service fuel systems, hydraulic components, or equipment exposed to high temperatures and oils. The chemical resistance of Viton makes it suitable for diesel, biodiesel blends, petroleum products and many organic solvents where nitrile or EPDM would degrade.\u003c\/p\u003e\n\u003cp\u003eThose who should look elsewhere include users needing extremely soft, low-durometer seals for delicate compression or where low friction is critical, and applications requiring FDA food-grade certification or very low-temperature service below -26C.\u003c\/p\u003e\n\n\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eExcellent chemical and high temperature resistance from the Viton FKM compound.\u003c\/li\u003e\n\u003cli\u003eFirm 90A hardness resists extrusion and maintains seal under pressure.\u003c\/li\u003e\n\u003cli\u003eClear nominal and actual dimensions make it easy to match replacements without guesswork.\u003c\/li\u003e\n\u003cli\u003ePack of 10 gives immediate spares for maintenance tasks, reducing downtime.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e90A hardness may be too stiff for applications that require a softer seal or low-friction movement.\u003c\/li\u003e\n\u003cli\u003eNot specified as food-grade, so it is not ideal for direct food or potable water contact.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct\u003c\/td\u003e\n\u003ctd\u003e343 Viton O-Ring, pack of 10\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\u003c\/td\u003e\n\u003ctd\u003e3-3\/4 in ID, 4-1\/8 in OD, 3\/16 in CS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eActual dimensions\u003c\/td\u003e\n\u003ctd\u003e3.725 in ID, 4.145 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\u003e94.62 mm ID, 105.28 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\n\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eThe Mr O-Ring 343 Viton 90A pack of 10 is a solid choice for anyone needing a reliable, high-temperature seal resistant to fuels and oils; it is good value for workshops and technicians who require durable replacements and quick spares. Choose this for chemical-exposed and high-heat sealing tasks, but consider a softer compound if you need more flexibility or food-grade approval.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eAre these o-rings compatible with gasoline and diesel?\u003c\/strong\u003e\u003cbr\u003eYes, the Viton FKM compound resists petroleum products, diesel and common fuel blends, making them suitable for those applications.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDo the sizes follow an industry standard?\u003c\/strong\u003e\u003cbr\u003eYes, the rings are sized to AS568 standards and the listing provides both nominal and actual dimensions to ensure a proper fit.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan these be used in very low temperature environments?\u003c\/strong\u003e\u003cbr\u003eThey are rated down to -26C (-15F); for colder service a different low-temperature compound would be recommended.\u003c\/p\u003e","brand":"Mr O-Ring","offers":[{"title":"Default Title","offer_id":48687506063579,"sku":"B07R85KTCP","price":59.39,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/51Kuv29LevL._SL1000_1ceaaf14-10ee-495c-aa4c-39344eb0bd41.jpg?v=1778648028","url":"https:\/\/gearmusthave.com\/products\/mr-o-ring-343-viton-o-ring-90a-durometer-pack-of-10-high-temp-seal","provider":"GearMustHave","version":"1.0","type":"link"}