{"product_id":"mr-o-ring-263-viton-o-ring-90a-durometer-7-1-4-in-id-pack-of-10","title":"Mr O-Ring 263 Viton O-Ring 90A Durometer, 7-1\/4 in ID (Pack of 10)","description":"\u003cp\u003eIn this review the reviewer looks at the Mr O-Ring 263 Viton O-Ring pack to decide whether it is the practical choice for demanding sealing tasks. The bottom line: this pack of ten 90A durometer Viton o-rings is aimed at technicians, mechanics and maintenance teams who need durable, heat- and chemical-resistant seals in a standard AS568-compatible size. Its strongest selling point is the proven performance of Viton (FKM) across high temperature and petroleum-based environments, making it a reliable replacement part for systems exposed to fuels, oils, solvents and ozone.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Viton (FKM) provides exceptional resistance to high temperatures, ozone and many organic chemicals for long service life.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHardness:\u003c\/strong\u003e The 90A durometer delivers a firm seal that resists extrusion while maintaining flexibility needed for static and some dynamic seals.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature range:\u003c\/strong\u003e Rated from -26C (-15F) to 232C (450F), it covers most automotive, industrial and HVAC temperature demands.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e Nominal 7-1\/4 in ID by 7-1\/2 in OD with 1\/8 in cross-section provides a close match to AS568 size 263 applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePack quantity:\u003c\/strong\u003e Sold as a pack of 10, it is convenient for routine maintenance and small projects where multiple identical seals are required.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChemical compatibility:\u003c\/strong\u003e Performs well in petroleum products, fuels, biodiesel blends, mineral and silicone oils, and many solvents for wide application use.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThe Mr O-Ring 263 Viton is best suited to workshops, fleet maintenance shops and serious DIYers who regularly service engines, pumps, or fluid-handling equipment exposed to fuels, hydraulic fluids or high heat. Its resistance to methanol or ethanol blends and strong acids makes it useful where standard nitrile o-rings would fail.\u003c\/p\u003e\n\u003cp\u003eThose who should look elsewhere include users needing extreme low-temperature flexibility below -26C or who require a softer durometer for delicate dynamic sealing; likewise, applications that demand food-grade or potable-water certification should consider specifically certified elastomers instead.\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-temperature and chemical resistance of Viton reduces seal failures in hot or solvent-exposed environments.\u003c\/li\u003e\n\u003cli\u003e90A durometer offers robust resistance to extrusion and wear for many industrial sealing tasks.\u003c\/li\u003e\n\u003cli\u003ePack of 10 provides good value for maintenance cycles and replacements.\u003c\/li\u003e\n\u003cli\u003eManufactured to AS568 size standards for straightforward replacement in standard housings.\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 and Viton material can be stiffer than softer o-rings, which may not suit some low-pressure dynamic seals.\u003c\/li\u003e\n\u003cli\u003eNo food-grade or potable-water certification specified, so not ideal 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\u003e7-1\/4 in ID x 7-1\/2 in OD x 1\/8 in CS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eActual dimensions\u003c\/td\u003e\n\u003ctd\u003e7.234 in ID x 7.512 in OD x 0.139 in CS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMetric dimensions\u003c\/td\u003e\n\u003ctd\u003e183.74 mm ID x 190.80 mm OD x 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 size\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\u003eThe Mr O-Ring 263 Viton 90A pack is a pragmatic, cost-effective choice for professionals and serious hobbyists who need reliable seals that withstand heat, fuels and aggressive chemicals. It is good value when a firm, long-lasting o-ring is required for AS568-compatible housings, though projects needing softer materials or specific food-grade approvals should consider alternative compounds.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eAre these o-rings compatible with fuel and biodiesel?\u003c\/strong\u003e\u003cbr\u003eYes, Viton (FKM) is formulated to perform well in petroleum products, diesel, and blends including biodiesel and alcohol blends in many cases.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDo these match AS568 size standards?\u003c\/strong\u003e\u003cbr\u003eYes, the product meets AS568 size definitions and the nominal and actual dimensions are listed to help confirm compatibility.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan they be used at very low temperatures?\u003c\/strong\u003e\u003cbr\u003eThe rated low end is -26C (-15F); for environments colder than that, a different elastomer with better low-temperature flexibility is recommended.\u003c\/p\u003e","brand":"Mr O-Ring","offers":[{"title":"Default Title","offer_id":48240111223003,"sku":"B07R71D3N4","price":70.39,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/51Kuv29LevL._SL1000_00bc666c-7aeb-47f3-90b2-e72e807f913e.jpg?v=1771093789","url":"https:\/\/gearmusthave.com\/products\/mr-o-ring-263-viton-o-ring-90a-durometer-7-1-4-in-id-pack-of-10","provider":"GearMustHave","version":"1.0","type":"link"}