{"product_id":"mr-o-ring-358-viton-o-ring-90a-durometer-pack-of-25-high-temp-seal","title":"Mr O-Ring 358 Viton O-Ring 90A Durometer Pack of 25 - High Temp Seal","description":"\u003cp\u003eIn this review the Mr O-Ring 358 Viton O-Ring (90A durometer, pack of 25) is evaluated for workshop and industrial sealing tasks where temperature and chemical resistance matter. The bottom line: this set is best for technicians and maintenance professionals who need a reliable, high-temperature fluorocarbon o-ring in a standard AS568 size; the 90A hardness and Viton material make it especially suited to fuel, oil and high-heat applications where standard nitrile or silicone rings fail. The pack quantity and consistent actual dimensions give the confidence needed for repeated repairs and preventive maintenance.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Viton (FKM) construction provides broad chemical resistance for use with petroleum products, fuels, hydraulic fluids and many solvents.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature range:\u003c\/strong\u003e Rated from -26C (-15F) to 232C (450F), which keeps seals stable across demanding hot and cold service conditions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHardness:\u003c\/strong\u003e 90A durometer offers a firm seal that resists extrusion and maintains shape under pressure for many sealing applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize accuracy:\u003c\/strong\u003e Nominal and actual dimensions are provided, with actual ID 5.600in, OD 6.020in and CS 0.210in, reducing guesswork when replacing existing o-rings.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePack size:\u003c\/strong\u003e Sold as a pack of 25, which is convenient for shops and maintenance crews that perform frequent replacements or keep spares on hand.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandards:\u003c\/strong\u003e Manufactured to match common AS568 size standards, simplifying selection for standardized fittings and housings.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThis o-ring set is aimed at mechanics, HVAC technicians, industrial maintenance teams and hobbyists who work with fuels, oils, hydraulic systems or high-temperature equipment. Those who need a resilient seal that tolerates ozone, weather and solvents will find the 358 Viton material appropriate for routine and demanding service.\u003c\/p\u003e\n\u003cp\u003eIt is not the best choice for applications that require very soft, low-durometer seals for delicate compression or for food-grade silicone-specific systems; users who need extreme low-temperature flexibility below -26C or certified food-contact materials should consider alternatives.\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 high-temperature resistance thanks to Viton FKM material.\u003c\/li\u003e\n\u003cli\u003eConsistent actual dimensions (5.600in ID, 6.020in OD, 0.210in CS) make replacements straightforward.\u003c\/li\u003e\n\u003cli\u003ePack of 25 supplies multiple repairs and saves time on repeat maintenance tasks.\u003c\/li\u003e\n\u003cli\u003e90A durometer offers durable sealing against extrusion and pressurized environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eRelatively firm 90A hardness may be too stiff for applications that require softer, more flexible o-rings.\u003c\/li\u003e\n\u003cli\u003eNot specified as food-grade or FDA compliant, so unsuitable for food or medical contact without further verification.\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\u003e5-5\/8in ID, 6in OD, 3\/16in CS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eActual dimensions\u003c\/td\u003e\n\u003ctd\u003e5.600in ID, 6.020in OD, 0.210in CS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMetric dimensions\u003c\/td\u003e\n\u003ctd\u003e142.24 mm ID, 152.90 mm OD, 5.33 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 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 358 Viton 90A pack is a practical, durable choice for maintenance professionals and workshops that need reliable seals for fuels, oils and high-temperature systems; the combination of Viton chemistry, clear actual dimensions and a 25-count pack make it good value for repair kits and preventive maintenance, provided a firm 90A hardness is acceptable for the application.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eAre these o-rings compatible with diesel and biodiesel blends?\u003c\/strong\u003e\u003cbr\u003eYes. Viton (FKM) is resistant to diesel and blends with biodiesel, making these o-rings suitable for such fuel systems.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDo the rings meet a standard size reference?\u003c\/strong\u003e\u003cbr\u003eThey are manufactured to match common AS568 size standards and list both nominal and actual dimensions for confirmation.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan these be used at very high temperatures?\u003c\/strong\u003e\u003cbr\u003eYes. The specified temperature range goes up to 232C (450F), so they are suitable for many high-temperature sealing tasks.\u003c\/p\u003e","brand":"Mr O-Ring","offers":[{"title":"Default Title","offer_id":48232662499547,"sku":"B07R43JV11","price":179.29,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/51Kuv29LevL._SL1000_262bb718-1cd3-48b6-9c8e-d609237a7f14.jpg?v=1770906519","url":"https:\/\/gearmusthave.com\/products\/mr-o-ring-358-viton-o-ring-90a-durometer-pack-of-25-high-temp-seal","provider":"GearMustHave","version":"1.0","type":"link"}