{"product_id":"mr-o-ring-434-viton-o-ring-90a-durometer-5-5-8-in-id-pack-of-10","title":"Mr O-Ring 434 Viton O-Ring 90A Durometer 5-5\/8 in ID Pack of 10","description":"\u003cp\u003eIn this review the Mr O-Ring 434 Viton O-Ring (90A durometer, pack of 10) is evaluated for common sealing tasks where chemical resistance and temperature tolerance matter. The bottom line: this set is for mechanics, technicians and maintenance crews who need consistent, AS568-size Viton rings that resist fuels, oils and high heat; the single biggest reason to buy is the combination of 90A hardness and Viton's broad chemical and temperature resistance, which makes these o-rings reliable in demanding fluid and high-temperature environments.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e 434 Viton (FKM) gives excellent resistance to petroleum fuels, hydraulic fluids and many solvents for long-lasting seals.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurometer:\u003c\/strong\u003e 90A hardness provides a firm sealing surface that resists extrusion and maintains shape under pressure for durable performance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e Nominal 5-5\/8 in ID and 6-1\/8 in OD with actual 5.600 in ID and 6.150 in OD for predictable fit in AS568 size applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature range:\u003c\/strong\u003e Rated from -26C (-15F) to 232C (450F), making these o-rings suitable for high-temperature air and many engine and process environments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePack size:\u003c\/strong\u003e Supplied as a pack of 10, convenient for routine maintenance, quick replacements, or small projects without buying bulk.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWho It's For\u003c\/h2\u003e\u003cp\u003eThe Mr O-Ring 434 Viton 90A is aimed at professionals and experienced DIYers who need a resilient seal for fuel systems, hydraulic equipment, or applications exposed to high heat, ozone and aggressive oils. Its AS568-compatible dimensions make it appropriate for repair shops, industrial maintenance, and HVAC technicians who want consistent, repeatable replacements.\u003c\/p\u003e\u003cp\u003eThose who should look elsewhere include users who need a very soft, low-durometer o-ring for delicate sealing or extremely low-temperature service below -26C, and anyone requiring non-fluorocarbon materials for specific chemical compatibilities not covered by Viton.\u003c\/p\u003e\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eHigh chemical and heat resistance from 434 Viton makes these o-rings suitable for fuels, oils and many solvents.\u003c\/li\u003e\n\u003cli\u003e90A durometer gives a robust seal that resists deformation under pressure and repeated cycles.\u003c\/li\u003e\n\u003cli\u003eAS568-compatible nominal and actual dimensions provide reliable fit for common standard housings and grooves.\u003c\/li\u003e\n\u003cli\u003ePack of 10 is practical for maintenance kits and routine replacements.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eViton is not ideal for extremely low-temperature applications below the stated -26C range.\u003c\/li\u003e\n\u003cli\u003eThe 90A hardness may be firmer than desired for very delicate sealing interfaces requiring softer compounds.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eMr O-Ring\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003e434 Viton (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\/8 in ID, 6-1\/8 in OD, 1\/4 in CS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eActual Dimensions\u003c\/td\u003e\n\u003ctd\u003e5.600 in ID, 6.150 in OD, 0.275 in 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\u003e10\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch2\u003eOur Verdict\u003c\/h2\u003e\u003cp\u003eThe Mr O-Ring 434 Viton 90A pack of 10 is a practical, cost-effective choice for technicians who need durable, heat- and chemical-resistant seals in standard AS568 sizes. Its combination of 90A hardness and Viton chemistry delivers reliable performance in fuel, oil and high-temperature systems, making it good value for maintenance crews and industrial users who prioritize longevity and compatibility.\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, 434 Viton is formulated to resist petroleum products including gasoline and diesel, and the review source lists compatibility with fuel blends and biodiesel.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDo the rings meet standard AS568 sizes?\u003c\/strong\u003e\u003cbr\u003eYes, these rings are made to AS568 nominal sizing and include the actual dimensions for fit confirmation.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the usable temperature range?\u003c\/strong\u003e\u003cbr\u003eThe rated operating range is -26C (-15F) up to 232C (450F), suitable for many high-temperature and engine applications.\u003c\/p\u003e","brand":"Mr O-Ring","offers":[{"title":"Default Title","offer_id":48194801828059,"sku":"B07R75LXXJ","price":135.29,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/51Kuv29LevL._SL1000_b8ca4e1c-6fb6-485b-bf69-a3dab7513c19.jpg?v=1770233475","url":"https:\/\/gearmusthave.com\/products\/mr-o-ring-434-viton-o-ring-90a-durometer-5-5-8-in-id-pack-of-10","provider":"GearMustHave","version":"1.0","type":"link"}