{"product_id":"mr-o-ring-234-viton-o-ring-90a-3in-id-pack-of-25-high-temp-seal","title":"Mr O-Ring 234 Viton O-Ring 90A 3in ID Pack of 25 - High Temp Seal","description":"\u003cp\u003eIn this review the Mr O-Ring 234 Viton O-Ring is evaluated for technicians, mechanics and hobbyists who need a small, durable seal that resists fuels and high temperatures. The bottom line: this 90A durometer Viton o-ring in a 25-pack offers dependable chemical and heat resistance for a wide range of sealing tasks, making it a useful parts-bin item for anyone working with petroleum products, fuels, hydraulic fluids or high-temperature air systems.\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 (fluorocarbon rubber), the compound provides excellent resistance to mineral oil, fuels and many organic solvents, which reduces seal failures in aggressive environments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurometer:\u003c\/strong\u003e The 90A hardness keeps the ring firm under compression, offering reliable sealing where a stiffer elastomer is required to resist extrusion and maintain shape.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature range:\u003c\/strong\u003e Rated from -26C to 232C (-15F to 450F), the o-ring works across broad service temperatures encountered in engine bays, hot process lines and heated enclosures.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAS568 sizing:\u003c\/strong\u003e Nominal 3in ID, 3-1\/4in OD, 1\/8in CS with actual dimensions close to spec, so it fits standard AS568 mounting grooves and replacements without fuss.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePack quantity:\u003c\/strong\u003e Supplied as a pack of 25, which keeps replacement parts on hand for routine maintenance and reduces downtime when multiple seals are required.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThis o-ring is best for maintenance technicians, automotive and marine mechanics, and equipment builders who need a resilient seal that tolerates fuels, oils and high temperatures. The chemical resistance of Viton makes it a solid choice for applications exposed to aromatics, diesel blends, silicone oils and hydraulic fluids.\u003c\/p\u003e\n\u003cp\u003eIt is less suitable for low-cost, low-temperature consumer projects where softer elastomers would seal better at very low compression, or for applications requiring FDA food-grade elastomers; buyers needing food-safe or very soft materials should look elsewhere.\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 heat resistance from the \u003cstrong\u003eViton FKM\u003c\/strong\u003e formulation.\u003c\/li\u003e\n\u003cli\u003eConsistent fit with AS568 nominal and actual dimensions that match common grooves.\u003c\/li\u003e\n\u003cli\u003eDurable 90A durometer reduces extrusion and maintains sealing force under pressure.\u003c\/li\u003e\n\u003cli\u003eBulk pack of 25 keeps spares ready for maintenance cycles.\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 it may not seal as well in very low-pressure or low-compression applications compared with softer o-rings.\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 dimensions\u003c\/td\u003e\n\u003ctd\u003e3 in ID, 3-1\/4 in OD, 1\/8 in CS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eActual dimensions\u003c\/td\u003e\n\u003ctd\u003e2.984 in ID, 3.262 in OD, 0.139 in CS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMetric dimensions\u003c\/td\u003e\n\u003ctd\u003e75.79 mm ID, 82.85 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\u003ctr\u003e\n\u003ctd\u003ePack quantity\u003c\/td\u003e\n\u003ctd\u003e25 pieces\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eThe Mr O-Ring 234 Viton o-ring is a practical, service-grade seal for professionals who need reliable chemical and high-temperature performance. Its 90A hardness and AS568-compatible sizing make it a dependable replacement part for engines, pumps and hydraulic systems, and the 25-piece pack provides good value for workshops that perform regular maintenance.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eAre these o-rings compatible with gasoline and diesel?\u003c\/strong\u003e\u003cbr\u003eYes. The Viton compound is rated for petroleum products including gasoline, diesel and many fuel blends.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWill the 90A hardness work for hydraulic seals?\u003c\/strong\u003e\u003cbr\u003eYes, the 90A durometer is suitable for many hydraulic sealing points where a firmer elastomer helps resist extrusion; confirm groove clearance for best fit.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDo these o-rings meet AS568 sizes?\u003c\/strong\u003e\u003cbr\u003eYes, the product is made to the AS568 nominal size series with the listed actual dimensions for reliable replacement.\u003c\/p\u003e","brand":"Mr O-Ring","offers":[{"title":"Default Title","offer_id":48189087580379,"sku":"B07R85TPCX","price":48.39,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/51Kuv29LevL._SL1000_fb219e18-fc37-4871-bff3-df357205c095.jpg?v=1769439047","url":"https:\/\/gearmusthave.com\/products\/mr-o-ring-234-viton-o-ring-90a-3in-id-pack-of-25-high-temp-seal","provider":"GearMustHave","version":"1.0","type":"link"}