{"product_id":"426-viton-o-ring-90a-4-5-8in-id-5-1-8in-od-pack-of-10","title":"426 Viton O-Ring 90A, 4-5\/8in ID 5-1\/8in OD - Pack of 10","description":"\u003cp\u003eIn this review the Mr O-Ring 426 Viton O-Ring pack is assessed for workshop and industrial sealing tasks; the bottom line is that these are a robust, high-temperature choice for mechanics and technicians who need dependable chemical and heat resistance. The reviewer found the 90A durometer Viton (FKM) material performs well where fuels, oils, and high temperatures are present, and the pack of 10 provides enough spares for routine maintenance. The product is best chosen when compatibility with petroleum, diesel, biodiesel blends, silicone oils, or high vacuum and ozone exposure is required.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e 426 Viton (FKM) construction gives excellent resistance to fuels, oils, hydraulic fluids and many solvents so seals last longer in aggressive environments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature range:\u003c\/strong\u003e Rated from -26C (-15F) to 232C (450F), enabling use in both cold starts and sustained high-heat service without rapid degradation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurometer:\u003c\/strong\u003e 90A hardness provides a firm compression set resistance that holds sealing force well in flanges and gland applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize accuracy:\u003c\/strong\u003e Nominal and actual dimensions are listed (4-5\/8in ID nominal; actual 4.600in ID) which helps installers match to AS568 size standards without guesswork.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePack quantity:\u003c\/strong\u003e Ten o-rings per pack supply spare parts for maintenance cycles or multiple assemblies, reducing downtime when replacements are needed.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThe Mr O-Ring 426 Viton is aimed at maintenance technicians, HVAC and hydraulic service professionals, and hobbyists who need a durable o-ring for fuel, oil, and high-temperature sealing applications. Its compatibility with petroleum, methanol or ethanol blends, diesel and biodiesel, and silicone oils makes it a practical choice for automotive, marine, and industrial equipment.\u003c\/p\u003e\n\u003cp\u003eThose who should look elsewhere include users needing soft, low-durometer seals for delicate compression or very low-pressure static seals, and buyers who require non-fluorocarbon materials for specific chemical compatibility not listed here. For metric-only specification projects, confirm size fits before purchase.\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\u003eHigh chemical and temperature resistance from the Viton (FKM) compound extends service life in harsh fluids and hot air.\u003c\/li\u003e\n\u003cli\u003e90A durometer offers reliable sealing and resistance to extrusion in moderate to heavy compression applications.\u003c\/li\u003e\n\u003cli\u003eClearly listed nominal and actual sizes reduce fitting errors when matching to AS568 size ranges.\u003c\/li\u003e\n\u003cli\u003ePack of 10 gives good value for maintenance needs and spare parts supply.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eHigher durometer means the o-ring is firmer and may not seal as easily in very light-pressure or delicate shafts.\u003c\/li\u003e\n\u003cli\u003eViton is not ideal for every chemical; confirm compatibility for uncommon aggressive chemicals before use.\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 (Fluorocarbon rubber, 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 ID \/ OD \/ CS\u003c\/td\u003e\n\u003ctd\u003e4-5\/8in ID, 5-1\/8in OD, 1\/4in CS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eActual ID \/ OD \/ CS\u003c\/td\u003e\n\u003ctd\u003e4.600in ID, 5.150in OD, 0.275in CS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMetric dimensions\u003c\/td\u003e\n\u003ctd\u003e116.84 mm ID, 130.82 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 (-15F) to 232C (450F)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePack quantity\u003c\/td\u003e\n\u003ctd\u003e10 o-rings\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eFor professionals and serious DIYers who need an o-ring that withstands fuels, oils and sustained heat, this 426 Viton 90A pack is a practical, cost-effective choice. The defined nominal and actual sizes and the broad temperature and chemical resistance make it a reliable replacement in many hydraulic, fuel and industrial sealing tasks, though users needing very soft seals should consider a lower durometer option.\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, the Viton compound is specified for performance with diesel and blends with biodiesel as listed in the product details.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDo the listed sizes follow a standard sizing chart?\u003c\/strong\u003e\u003cbr\u003eYes, the rings are offered to meet AS568 size definitions with both nominal and actual dimensions provided to aid selection.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the usable temperature range for these o-rings?\u003c\/strong\u003e\u003cbr\u003eThey are rated from -26C (-15F) up to 232C (450F), suitable for most high-temperature sealing needs.\u003c\/p\u003e","brand":"Mr O-Ring","offers":[{"title":"Default Title","offer_id":48244291698907,"sku":"B07R62TCX6","price":112.19,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/51Kuv29LevL._SL1000_32928d6b-a83a-4ddb-9e86-cd78679fbc41.jpg?v=1771005046","url":"https:\/\/gearmusthave.com\/products\/426-viton-o-ring-90a-4-5-8in-id-5-1-8in-od-pack-of-10","provider":"GearMustHave","version":"1.0","type":"link"}