{"product_id":"431-viton-o-ring-75a-durometer-5-1-4-in-id-pack-of-10","title":"431 Viton O-Ring 75A Durometer, 5-1\/4 in ID - Pack of 10","description":"\u003cp\u003eIn this review the 431 Viton O-ring is evaluated as a practical sealing choice for technicians, hobbyists, and maintenance professionals who need a durable, chemical-resistant replacement O-ring. The bottom line is that this pack of ten provides reliable heat and fuel resistance at a sensible price, making it a good buy when compatibility with hydrocarbons and high temperatures is the priority. The reviewer found the 75A hardness and round cross-section give a predictable seal in cylindrical fittings and small pumps without the fuss of custom fabrication.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Made of Viton fluorocarbon elastomer to resist many fuels and chemicals for longer service life.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature range:\u003c\/strong\u003e Rated from -15 degrees F to 400 degrees F to handle hot engine or industrial environments without rapid degradation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHardness:\u003c\/strong\u003e 75A durometer provides firm resistance to penetration while allowing enough compression for a reliable seal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShape and fit:\u003c\/strong\u003e Round cross-section designed to form a secure seal between overlapping cylindrical surfaces in pumps and fittings.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Suitable with aromatic and aliphatic hydrocarbons, silicone oil, and high vacuum conditions for a range of applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandards:\u003c\/strong\u003e Produced to meet the AS568A sizing standard so it fits common grooves and housings that accept that spec.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThis pack is best for mechanics, gunsmiths, and field technicians who replace seals in fuel systems, suppressors, or hydraulic fittings and need a material with proven resistance to fuels and heat. The pack of ten means small shops or DIYers won't run out during repairs or modifications.\u003c\/p\u003e\n\u003cp\u003eThose who need resistance to strong bases, ammonia gas, glycol-based brake fluids, or sustained super-heated steam should look for alternative elastomers, since Viton is vulnerable to these media. Also, if extreme low-temperature flexibility below the specified range is required, a different compound may be better.\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\u003eDurable chemical and fuel resistance makes these O-rings suitable for tough service environments.\u003c\/li\u003e\n\u003cli\u003eWide operating temperature range supports both hot and some cold applications without rapid failure.\u003c\/li\u003e\n\u003cli\u003eConsistent 75A hardness and AS568A sizing give predictable fit and sealing performance in standard grooves.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eNot compatible with low molecular organic acids, amines, strong alkalis or glycol-based brake fluids, which limits use in some automotive systems.\u003c\/li\u003e\n\u003cli\u003eStiffer 75A hardness can be less forgiving in very low-temperature or ultra-delicate sealing needs.\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 elastomer)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDurometer\u003c\/td\u003e\n\u003ctd\u003e75A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInner diameter (ID)\u003c\/td\u003e\n\u003ctd\u003e5-1\/4 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOuter diameter (OD)\u003c\/td\u003e\n\u003ctd\u003e5-3\/4 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCross-section width\u003c\/td\u003e\n\u003ctd\u003e1\/4 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eColor\u003c\/td\u003e\n\u003ctd\u003eBlack\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStandards\u003c\/td\u003e\n\u003ctd\u003eMeets AS568A sizing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eThe 431 Viton O-ring pack is a sensible buy for anyone replacing seals exposed to fuels, aromatic or aliphatic hydrocarbons, and heat where durability matters. With standard sizing and a durable 75A durometer, it offers good value for routine maintenance and specialized assemblies, but users should verify media compatibility when acids, amines, or glycol fluids are present.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eAre these O-rings suitable for fuel system use?\u003c\/strong\u003e\u003cbr\u003eYes; Viton is compatible with many fuels and aromatic hydrocarbons, making these suitable for many fuel system seal replacements.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat temperatures can they withstand?\u003c\/strong\u003e\u003cbr\u003eThey are rated for continuous use from -15 degrees F to 400 degrees F, covering most automotive and industrial conditions short of super-heated steam exposure.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDo they fit standard grooves?\u003c\/strong\u003e\u003cbr\u003eYes; the O-rings meet AS568A sizing conventions and the dimensions stated should fit standard grooves that accept that series.\u003c\/p\u003e","brand":"Mr O-Ring","offers":[{"title":"Default Title","offer_id":48250445758683,"sku":"B000FMUW6U","price":92.39,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/81iyYJCP7YL._SL1500_5b185fc0-96f4-43bb-a476-4ed791eb6e9b.jpg?v=1771099913","url":"https:\/\/gearmusthave.com\/products\/431-viton-o-ring-75a-durometer-5-1-4-in-id-pack-of-10","provider":"GearMustHave","version":"1.0","type":"link"}