{"product_id":"mr-o-ring-266-viton-o-ring-90a-8in-id-8-1-4in-od-pack-of-10-durable","title":"Mr O-Ring 266 Viton O-Ring 90A, 8in ID 8-1\/4in OD Pack of 10 - Durable","description":"\u003cp\u003eIn this review the Mr O-Ring 266 Viton O-Ring (pack of 10) is evaluated for technicians, maintenance crews, and DIYers who need a reliable high-temperature seal. The bottom line: this 90A durometer Viton o-ring stands out for its wide temperature tolerance and chemical resistance, making it a practical choice where petroleum, fuels, oils or exposure to ozone and weathering are expected. The review focuses on real-world sealing performance, dimensional accuracy, and where this size fits common hydraulic and plumbing repairs.\u003c\/p\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n \u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Made from Viton (fluorocarbon rubber FKM) for excellent resistance to fuels, oils and many solvents.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eTemperature range:\u003c\/strong\u003e Rated from -26C (-15F) to 232C (450F), allowing use in high temperature environments without rapid degradation.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eDurometer:\u003c\/strong\u003e The 90A hardness provides a firm sealing surface that resists extrusion while still compressing to form a reliable seal.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e Nominal 8in ID, 8-1\/4in OD and 1\/8in cross-section with actual dimensions close to nominal for predictable fit in standard glands.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eChemical compatibility:\u003c\/strong\u003e Performs well with petroleum, diesel and biodiesel blends, methanol or ethanol blends, mineral and silicone oils, and many acids and solvents.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003ePack quantity:\u003c\/strong\u003e Supplied as a pack of 10, convenient for multiple repairs or stocking spares.\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 professionals and experienced hobbyists who work on hydraulic systems, fuel systems, pumps and industrial equipment where exposure to high temperature and aggressive fluids is common. It is also useful for facilities maintenance teams needing a standard AS568-compatible size in bulk.\u003c\/p\u003e\n\u003cp\u003eThose looking for a softer seal for low-pressure or delicate elastomeric applications, or who require food-grade or FDA-approved elastomers, should look elsewhere. This product is optimized for chemical and temperature resistance rather than very low durometer compression sealing.\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 high temperature and chemical resistance suitable for fuels, oils and many solvents.\u003c\/li\u003e\n \u003cli\u003e90A durometer gives a durable, extrusion-resistant seal in demanding service.\u003c\/li\u003e\n \u003cli\u003eActual dimensions closely match nominal sizes, simplifying replacement in standard glands.\u003c\/li\u003e\n \u003cli\u003ePack of 10 offers good value for maintenance stocking and repeat repairs.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n \u003cli\u003eFirmer 90A hardness may not seal as well in very low-pressure or delicate flange applications that need a softer material.\u003c\/li\u003e\n \u003cli\u003eNot intended for applications requiring specific food-grade or medical certifications.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\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\u003e8in ID, 8-1\/4in OD, 1\/8in CS\u003c\/td\u003e\n\u003c\/tr\u003e\n \u003ctr\u003e\n\u003ctd\u003eActual dimensions\u003c\/td\u003e\n\u003ctd\u003e7.984in ID, 8.262in OD, 0.139in CS\u003c\/td\u003e\n\u003c\/tr\u003e\n \u003ctr\u003e\n\u003ctd\u003eMetric dimensions\u003c\/td\u003e\n\u003ctd\u003e202.79 mm ID, 209.85 mm OD, 3.53 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 266 Viton o-ring pack is a solid choice for industrial and maintenance uses where high temperature and chemical resistance matter. With accurate dimensions, a durable 90A hardness and the versatility of Viton, it delivers dependable sealing for fuel, oil and high-temperature systems, making the pack of 10 a practical value for professionals who need reliable spares.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eIs this o-ring compatible with diesel and biodiesel?\u003c\/strong\u003e\u003cbr\u003eYes, the Viton formulation is rated for diesel and biodiesel blends and performs well with petroleum products.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWill the 90A hardness seal well in low-pressure fittings?\u003c\/strong\u003e\u003cbr\u003eIt seals reliably in many applications but the firmer 90A durometer may be less forgiving than softer elastomers for very low-pressure or irregular surfaces.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes the size conform to AS568 standards?\u003c\/strong\u003e\u003cbr\u003eYes, the product is manufactured to meet the AS568 size definitions for the listed nominal dimensions.\u003c\/p\u003e","brand":"Mr O-Ring","offers":[{"title":"Default Title","offer_id":48604402024667,"sku":"B07R72LCGY","price":75.89,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/51Kuv29LevL._SL1000_21bde60f-d275-45a4-9ed9-9fde602575ab.jpg?v=1778416954","url":"https:\/\/gearmusthave.com\/products\/mr-o-ring-266-viton-o-ring-90a-8in-id-8-1-4in-od-pack-of-10-durable","provider":"GearMustHave","version":"1.0","type":"link"}