{"product_id":"439-viton-o-ring-90a-6-1-2in-id-7in-od-pack-of-5-high-temp-seal","title":"439 Viton O-Ring 90A 6-1\/2in ID 7in OD Pack of 5 - High Temp Seal","description":"\u003cp\u003eIn this review the 439 Viton O-Ring 90A (pack of 5) is evaluated for mechanics, fabricators, and maintenance technicians who need a reliable high-temperature seal. The bottom line: this set is for anyone who requires a small stock of consistent, durable Viton o-rings that resist fuels, oils and elevated temperatures. The reviewer found the 90A durometer provides a firm sealing surface while the actual dimensions closely match nominal size, making these o-rings a practical choice for routine replacement or inventory without overpaying for specialty elastomers.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Made from Viton (FKM) so the o-ring resists fuels, mineral oils, hydraulic fluids and many solvents for longer service life.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurometer:\u003c\/strong\u003e The 90A hardness offers a firm sealing surface that performs well under compression in static and low-movement dynamic seals.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature range:\u003c\/strong\u003e Rated from -26C (-15F) to 232C (450F) so the rings can be used in very high temperature applications without rapid degradation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize accuracy:\u003c\/strong\u003e Actual dimensions (6.475in ID, 7.025in OD, 0.275in CS) closely track the nominal size for predictable fit in standardized grooves.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVersatility:\u003c\/strong\u003e Performs in contact with petroleum products, fuels including methanol or ethanol blends, diesel, silicone oils, ozone and weather exposure for a wide range of sealing tasks.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePack quantity:\u003c\/strong\u003e Sold as a pack of 5 to keep spare parts on hand for scheduled maintenance or small repair jobs.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThese Viton o-rings suit industrial maintenance crews, marine technicians, and automotive professionals who need seals resistant to fuels, high heat and chemical exposure. The firm 90A durometer works well for static seals and applications where a durable, less-compressible ring is preferred.\u003c\/p\u003e\n\u003cp\u003eThose needing extremely soft or low-friction seals, or applications requiring food-grade elastomers, should look elsewhere; this product is optimized for chemical and temperature resistance rather than very low hardness or regulatory food-contact approvals.\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 makes these rings durable in harsh environments.\u003c\/li\u003e\n\u003cli\u003eAccurate actual dimensions provide reliable fit for AS568-equivalent size standards.\u003c\/li\u003e\n\u003cli\u003e90A durometer balances resilience and sealing force for many static seal uses.\u003c\/li\u003e\n\u003cli\u003ePack of 5 gives immediate spares for maintenance without bulk storage of many sizes.\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 seals that require very soft or highly conformable material.\u003c\/li\u003e\n\u003cli\u003eNot specified for food-contact or pharmaceutical approvals, so unsuitable for those regulated uses.\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\u003e6-1\/2in ID, 7in OD, 1\/4in CS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eActual Dimensions\u003c\/td\u003e\n\u003ctd\u003e6.475in ID, 7.025in OD, 0.275in CS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMetric Dimensions\u003c\/td\u003e\n\u003ctd\u003e164.47 mm ID, 178.45 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\u003e5 rings\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eThe 439 Viton O-Ring 90A in a pack of 5 is a practical, good-value option for professionals needing heat- and chemical-resistant seals that match AS568 size expectations. Buy it if you need dependable, long-lasting rings for fuel, oil or high-temperature applications; choose a different compound or lower durometer if your job requires food-contact compliance or very soft seals.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eAre these o-rings suitable for fuel exposure?\u003c\/strong\u003e\u003cbr\u003eYes. The Viton (FKM) compound resists petroleum products, fuel blends with methanol or ethanol, and diesel including biodiesel blends.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDo the rings meet a standard size?\u003c\/strong\u003e\u003cbr\u003eThey are offered to match AS568-equivalent sizing with listed actual and nominal dimensions for predictable fit.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat temperatures can these o-rings handle?\u003c\/strong\u003e\u003cbr\u003eThe rated range is -26C (-15F) up to 232C (450F), suitable for many high-temperature sealing tasks.\u003c\/p\u003e","brand":"Mr O-Ring","offers":[{"title":"Default Title","offer_id":48198583091419,"sku":"B07R62QKPQ","price":97.89,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/51Kuv29LevL._SL1000_abd7143d-7154-49b5-874d-30dafb891a5f.jpg?v=1770261660","url":"https:\/\/gearmusthave.com\/products\/439-viton-o-ring-90a-6-1-2in-id-7in-od-pack-of-5-high-temp-seal","provider":"GearMustHave","version":"1.0","type":"link"}