{"product_id":"mr-o-ring-352-viton-o-ring-90a-durometer-4-7-8in-id-pack-of-5","title":"Mr O-Ring 352 Viton O-Ring 90A Durometer 4-7\/8in ID Pack of 5","description":"\u003cp\u003eIn this review the Mr O-Ring 352 Viton O-Ring is evaluated for installers and maintenance techs who need a durable, high-temperature seal in petroleum, fuel, and harsh chemical environments. The bottom line: this pack of five 90A durometer Viton o-rings stands out for its wide temperature range and chemical resistance, making it a reliable replacement part for hydraulic, fuel, and industrial sealing tasks where durability and compatibility matter most.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Viton (fluorocarbon FKM) provides robust resistance to fuels, oils, many solvents and high temperature exposure, reducing seal failures in aggressive media.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHardness:\u003c\/strong\u003e 90A durometer gives a firm cross-section that holds shape under compression and is suitable for static and some dynamic sealing where firmer material is required.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize accuracy:\u003c\/strong\u003e Nominal 4-7\/8in ID and 5-1\/4in OD with actual dimensions listed ensures a close fit for AS568-based applications and easier part selection.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature range:\u003c\/strong\u003e Rated from -26C (-15F) to 232C (450F), allowing use from cold starts up to very high operating temperatures without rapid degradation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChemical compatibility:\u003c\/strong\u003e Performs well in petroleum, diesel, biodiesel blends, methanol\/ethanol blends, mineral oil, silicone grease, and many organic solvents, expanding its application range.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePack size:\u003c\/strong\u003e Supplied as a pack of five to cover multiple replacements or to keep spares on hand for routine maintenance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThis is a practical choice for industrial maintenance crews, automotive technicians, and anyone working with fuel systems, hydraulic equipment, or high-temperature seals who needs a durable, chemical-resistant o-ring that closely follows AS568 sizing. It is particularly useful where exposure to fuels, oils, ozone or high temperatures is expected.\u003c\/p\u003e\n\u003cp\u003eThose who should look elsewhere include users who need very soft, low-durometer seals for low-pressure dynamic shafts, or applications requiring FDA food-grade or EPDM-specific compatibility; Viton is not ideal for some steam or highly alkaline cleaning processes.\u003c\/p\u003e\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 for long service life in aggressive fluids.\u003c\/li\u003e\n\u003cli\u003e90A hardness maintains seal shape and compression set resistance in many static and semi-dynamic uses.\u003c\/li\u003e\n\u003cli\u003eAccurate actual and metric dimensions simplify replacement in AS568-sized grooves.\u003c\/li\u003e\n\u003cli\u003ePack of five provides immediate spares for maintenance tasks.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eHigher 90A hardness may be too stiff for very low-pressure dynamic seals or delicate components.\u003c\/li\u003e\n\u003cli\u003eViton is not suitable for some highly alkaline environments or certain steam-cleaning processes.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\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\u003e4-7\/8in ID, 5-1\/4in OD, 3\/16in CS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eActual dimensions\u003c\/td\u003e\n\u003ctd\u003e4.850in ID, 5.270in OD, 0.210in CS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMetric dimensions\u003c\/td\u003e\n\u003ctd\u003e123.19 mm ID, 133.85 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\u003ctr\u003e\n\u003ctd\u003ePack quantity\u003c\/td\u003e\n\u003ctd\u003e5 o-rings\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eFor technicians who need a dependable, high-temperature, and chemically resistant seal, the Mr O-Ring 352 Viton 90A in a pack of five is a solid value; it matches AS568 sizing, offers wide compatibility with fuels and oils, and the 90A hardness suits many static and semi-dynamic sealing tasks where durability is the priority.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eAre these o-rings compatible with diesel and biodiesel blends?\u003c\/strong\u003e\u003cbr\u003eYes, Viton is rated for petroleum products including diesel and common biodiesel blends and performs well in those fluids.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWill the 90A hardness work for moving shafts?\u003c\/strong\u003e\u003cbr\u003e90A is firmer than low-durometer seals and can work for some semi-dynamic uses, but it may be too stiff for low-pressure, high-wear dynamic shaft seals.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDo these follow standard AS568 sizes?\u003c\/strong\u003e\u003cbr\u003eThe product is manufactured to match AS568 size standards and provides both nominal and actual dimensions for accurate replacement.\u003c\/p\u003e","brand":"Mr O-Ring","offers":[{"title":"Default Title","offer_id":48230114459867,"sku":"B07R72VLFV","price":47.29,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/51Kuv29LevL._SL1000_9ee6749c-c0a7-4b33-b830-c3c05f8006c2.jpg?v=1770704655","url":"https:\/\/gearmusthave.com\/products\/mr-o-ring-352-viton-o-ring-90a-durometer-4-7-8in-id-pack-of-5","provider":"GearMustHave","version":"1.0","type":"link"}