{"product_id":"mr-o-ring-441-viton-o-ring-7-in-id-90a-durometer-pack-of-5","title":"Mr O-Ring 441 Viton O-Ring 7 in ID 90A Durometer - Pack of 5","description":"\u003cp\u003eIn this review of the Mr O-Ring 441 Viton O-Ring, the bottom line is simple: this pack of five high-durometer Viton seals is best for technicians and hobbyists who need reliable, high-temperature resistance in petroleum, fuel and chemical environments. The reviewer found the 90A durometer construction delivers a firm, durable seal while the nominal 7 in ID and 1\/4 in cross-section match common AS568 size expectations, making these o-rings an easy replacement for many hydraulic and fluid-handling applications. Built from FKM material, they stand out for chemical and heat tolerance where standard nitrile rings fail.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e The Viton FKM compound offers excellent resistance to fuels, mineral oils and many solvents, extending seal life in harsh fluids.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurometer:\u003c\/strong\u003e The 90A hardness provides a firmer seal that resists extrusion and deformation under pressure, useful in static and dynamic fittings.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature Range:\u003c\/strong\u003e Rated from -26C to 232C, these rings tolerate a wide span from subfreezing to very high service temperatures.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize Accuracy:\u003c\/strong\u003e Nominal 7 in ID with actual dimensions close to spec ensures compatibility with AS568-defined sizes for straightforward replacements.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePack Quantity:\u003c\/strong\u003e Sold in packs of five, offering spare parts on hand for maintenance without buying excess inventory.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWho It's For\u003c\/h2\u003e\u003cp\u003eThese Mr O-Ring 441 Viton rings suit maintenance technicians, mechanics and equipment owners who work with fuels, biodiesel blends, hydraulic fluids or high-temperature components and need a robust seal that resists chemical attack. They are also useful for laboratory setups and vacuum applications where low permeability and ozone resistance matter.\u003c\/p\u003e\u003cp\u003eUsers who primarily need very soft or highly flexible seals for low-pressure, low-temperature elastomer cushions should look to lower durometer materials instead, since the 90A hardness favors durability and resistance over extreme flexibility.\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 chemical and heat resistance from FKM material improves longevity in fuel and solvent environments.\u003c\/li\u003e\n\u003cli\u003eFirm 90A durometer reduces extrusion and maintains sealing pressure under load.\u003c\/li\u003e\n\u003cli\u003eAccurate actual dimensions near nominal make these straightforward replacements for AS568 sizes.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\u003cli\u003eThe relatively high hardness means reduced elasticity for applications that need a softer, more conforming seal.\u003c\/li\u003e\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\u003c\/td\u003e\n\u003ctd\u003e7 in ID, 7-1\/2 in OD, 1\/4 in CS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eActual Dimensions\u003c\/td\u003e\n\u003ctd\u003e6.975 in ID, 7.525 in OD, 0.275 in CS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMetric Dimensions\u003c\/td\u003e\n\u003ctd\u003e177.17 mm ID, 191.15 mm OD, 6.99 mm CS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTemperature Range\u003c\/td\u003e\n\u003ctd\u003e-26C to 232C (-15F to 450F)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch2\u003eOur Verdict\u003c\/h2\u003e\u003cp\u003eThe Mr O-Ring 441 Viton 90A pack of five is a solid choice for anyone needing durable, heat- and chemical-resistant seals that conform to AS568 sizing. It represents good value for maintenance and repair when resistance to fuels, oils and high temperatures is required, though those needing a softer seal should consider lower durometer options.\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 FKM compound is designed to perform well with petroleum products, fuels and diesel blends including biodiesel.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDo the rings match AS568 standard sizes?\u003c\/strong\u003e\u003cbr\u003eYes, the rings meet AS568 size definitions with nominal 7 in ID and actual dimensions very close to the standard.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the usable temperature range?\u003c\/strong\u003e\u003cbr\u003eThe specified range is -26C (-15F) to 232C (450F), suitable for most high-temperature sealing applications.\u003c\/p\u003e","brand":"Mr O-Ring","offers":[{"title":"Default Title","offer_id":48251129463003,"sku":"B07R543DBC","price":107.79,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/51Kuv29LevL._SL1000_26789afa-4129-45f1-884a-a5e5d7337b6c.jpg?v=1770962667","url":"https:\/\/gearmusthave.com\/products\/mr-o-ring-441-viton-o-ring-7-in-id-90a-durometer-pack-of-5","provider":"GearMustHave","version":"1.0","type":"link"}