{"product_id":"324-viton-o-ring-75a-durometer-1-3-8-in-id-1-3-4-in-od-pack-of-25","title":"324 Viton O-Ring 75A Durometer 1-3\/8 in ID 1-3\/4 in OD Pack of 25","description":"\u003cp\u003eIn this review the 324 Viton O-ring is evaluated for workshop and field use where chemical and heat resistance matter most. The bottom line: this pack of 25 black Viton seals is aimed at mechanics, gunsmiths, and equipment maintainers who need reliable, heat-resistant sealing that stands up to fuels and many solvents; the single biggest reason to buy is the material choice - \u003cstrong\u003eViton\u003c\/strong\u003e fluorocarbon elastomer - which provides broad chemical compatibility and high temperature tolerance uncommon in generic rubber O-rings.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Made from \u003cstrong\u003eViton\u003c\/strong\u003e fluorocarbon elastomer, the O-ring offers strong resistance to fuels, oils, and many solvents 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, it handles hot engine compartments and many industrial heating applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurometer:\u003c\/strong\u003e A 75A hardness gives a firm seal that resists penetration and extrusion while maintaining elasticity for repeated use.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eForm factor:\u003c\/strong\u003e Round cross-section ensures a dependable seal between cylindrical overlapping surfaces like shafts, housings, and threaded joints.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandards:\u003c\/strong\u003e Manufactured to the AS568A size standard, it fits common 324-size grooves and replacement tasks without guesswork.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePack quantity:\u003c\/strong\u003e Supplied as a pack of 25, useful for maintenance kits, multiple repairs, or stocking workshop spares.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThis O-ring is best for technicians, hobbyists, and maintenance teams who service fuel systems, hydraulic fittings, suppressors, or small pumps and need a seal that resists heat and many chemicals. It is also a good choice for anyone replacing worn barrel seals, fuel bottle caps, or other cylindrical seals where the AS568A 324 size is required.\u003c\/p\u003e\n\u003cp\u003eThose who should look elsewhere include users who need compatibility with strong alkalis, ammonia, certain glycol-based brake fluids, or super-heated steam, since \u003cstrong\u003eViton\u003c\/strong\u003e can be vulnerable to these specific media. For very soft or silicone-like sealing needs a lower durometer elastomer may be preferable.\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 fuel resistance due to \u003cstrong\u003eViton\u003c\/strong\u003e composition, reducing premature failure in contact with oils and aromatic hydrocarbons.\u003c\/li\u003e\n\u003cli\u003eWide usable temperature window up to 400 degrees F, suitable for high-heat locations and hot fluids.\u003c\/li\u003e\n\u003cli\u003eGood durability and fit reported by customers in applications like Remington 1100 barrel seals and fuel bottles, offering value in a 25-pack.\u003c\/li\u003e\n\u003cli\u003eConsistent sizing to AS568A makes replacements straightforward for common equipment.\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 weight organic acids, ammonia gas, strong alkalis, certain brake fluids, or super-heated steam, which limits use in some specialty chemical systems.\u003c\/li\u003e\n\u003cli\u003eThe 75A hardness is firm; it may not be ideal where an unusually soft or very compliant seal is required.\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\u003eColor\u003c\/td\u003e\n\u003ctd\u003eBlack\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInner diameter (ID)\u003c\/td\u003e\n\u003ctd\u003e1-3\/8 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOuter diameter (OD)\u003c\/td\u003e\n\u003ctd\u003e1-3\/4 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCross-section width\u003c\/td\u003e\n\u003ctd\u003e3\/16 in\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\u003eTemperature range\u003c\/td\u003e\n\u003ctd\u003e-15 degrees F to 400 degrees F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eThe 324 Viton O-ring pack is recommended for mechanics, gunsmiths, and maintenance professionals who need a heat- and fuel-resistant replacement that fits AS568A 324 grooves. It offers solid durability and chemical resistance for most fuel and petroleum applications and represents good value in a 25-pack, but avoid it where exposure to ammonia, strong alkalis, or glycol brake fluids is expected.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eWill this fit standard 324 grooves?\u003c\/strong\u003e\u003cbr\u003eYes. The O-ring conforms to the AS568A 324 size and will fit standard grooves and housings made for that size.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan it be used on fuel system components?\u003c\/strong\u003e\u003cbr\u003eYes. The Viton material is compatible with many fuels, aromatic and aliphatic hydrocarbons, and non-flammable hydraulic fuels, making it suitable for many fuel system seals.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs it resistant to high heat?\u003c\/strong\u003e\u003cbr\u003eYes. It is rated for use up to 400 degrees F and performs well in high-temperature environments within that range.\u003c\/p\u003e","brand":"Mr O-Ring","offers":[{"title":"Default Title","offer_id":48638133764315,"sku":"B000FMUW92","price":43.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/81iyYJCP7YL._SL1500_ae019486-5c64-40b4-8606-76973f3e55bc.jpg?v=1778729562","url":"https:\/\/gearmusthave.com\/products\/324-viton-o-ring-75a-durometer-1-3-8-in-id-1-3-4-in-od-pack-of-25","provider":"GearMustHave","version":"1.0","type":"link"}