{"product_id":"mr-o-ring-172-viton-o-ring-90a-durometer-pack-of-25-durable-seal","title":"Mr O-Ring 172 Viton O-Ring 90A Durometer Pack of 25 - Durable Seal","description":"\u003cp\u003eIn this review the Mr O-Ring 172 Viton O-Ring 90A pack is evaluated for technicians, maintenance shops and home mechanics who need reliable chemical and temperature resistance in a common AS568 size. The bottom line: this pack of 25 o-rings delivers consistent dimensions and excellent resistance to fuels, oils and high heat, making it a practical spare-parts purchase for seals exposed to aggressive fluids or elevated temperatures. The reviewer found the 90A durometer balance of firmness and flexibility appropriate for static and low-dynamic sealing tasks where Viton performance matters.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e FKM Viton composition provides strong resistance to fuels, mineral oils and many organic solvents, reducing risk of premature swelling or failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurometer:\u003c\/strong\u003e 90A hardness offers a firm seal that holds shape under compression and performs well at higher temperatures.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize accuracy:\u003c\/strong\u003e Actual dimensions are listed and consistent, so fitment for AS568-equivalent grooves is reliable without guesswork.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature range:\u003c\/strong\u003e Wide operating range from -26C to 232C supports both cold starts and high temperature service environments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePack quantity:\u003c\/strong\u003e Supplied as a pack of 25, which is useful for stocking common replacement parts and reducing downtime.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWho It's For\u003c\/h2\u003e\u003cp\u003eThe Mr O-Ring 172 Viton set is suited to professional mechanics, industrial maintenance teams and hobbyists who regularly service fuel systems, hydraulic components or high-temperature seals and need a resilient material like \u003cstrong\u003eViton\u003c\/strong\u003e. Its resistance to gasoline, diesel blends, mineral oils and many chemicals makes it a practical choice where compatibility matters.\u003c\/p\u003e\u003cp\u003eIt is less appropriate for applications that require very soft, low-durometer seals or for dynamic rotary seals that need specialized compound formulations; users needing extreme cryogenic performance or adhesive bonding should consider other materials.\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 compared with standard elastomers.\u003c\/li\u003e\n\u003cli\u003eConsistent actual dimensions (8.237 in ID, 8.443 in OD, 0.103 in CS) make installation predictable.\u003c\/li\u003e\n\u003cli\u003ePack of 25 reduces repeat ordering and provides spares for routine maintenance.\u003c\/li\u003e\n\u003cli\u003eUnlimited shelf-life claimed, simplifying long-term inventory management.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e90A hardness can be stiff for some low-pressure sealing needs or delicate flange compression surfaces.\u003c\/li\u003e\n\u003cli\u003eViton is costlier than general-purpose nitrile for non-aggressive fluid applications.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\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 size\u003c\/td\u003e\n\u003ctd\u003e8-1\/4 in ID, 8-7\/16 in OD, 3\/32 in CS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eActual dimensions\u003c\/td\u003e\n\u003ctd\u003e8.237 in ID, 8.443 in OD, 0.103 in CS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMetric dimensions\u003c\/td\u003e\n\u003ctd\u003e209.22 mm ID, 214.46 mm OD, 2.62 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\u003e25 o-rings\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch2\u003eOur Verdict\u003c\/h2\u003e\u003cp\u003eThe Mr O-Ring 172 Viton 90A pack is a sensible buy for professionals and serious DIYers who need durable, chemically resistant seals in an AS568-equivalent size. It offers good value when longevity and resistance to fuels, oils and high heat are required, though customers with very soft-seal needs may prefer a lower durometer option.\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, Viton is formulated to resist petroleum fuels and diesel blends, including many fuel additives.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDo the listed dimensions match typical AS568 sizing?\u003c\/strong\u003e\u003cbr\u003eYes, the product notes nominal and actual dimensions that correspond to the AS568 equivalent for consistent fit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan these be used for dynamic rotary seals?\u003c\/strong\u003e\u003cbr\u003eThey are suitable for many static and low-dynamic applications, but extreme-speed rotary seals may require specialized compounds and designs.\u003c\/p\u003e","brand":"Mr O-Ring","offers":[{"title":"Default Title","offer_id":48665758695643,"sku":"B07R62STM5","price":129.79,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/51Kuv29LevL._SL1000_a3f38cef-7e9a-4d0d-9c72-8f5cb31d3eef.jpg?v=1778710736","url":"https:\/\/gearmusthave.com\/products\/mr-o-ring-172-viton-o-ring-90a-durometer-pack-of-25-durable-seal","provider":"GearMustHave","version":"1.0","type":"link"}