{"product_id":"329-viton-o-ring-2in-id-75a-pack-of-25-chemical-heat-resistant","title":"329 Viton O-Ring 2in ID 75A Pack of 25 - Chemical \u0026 Heat Resistant","description":"\u003cp\u003eIn this review the 329 Viton O-Ring (2in ID, 75A durometer) is evaluated as a practical replacement seal for industrial and hobby applications where chemical and heat resistance matter. The bottom line: this pack of 25 is for anyone needing reliable, repeatable seals that tolerate fuels, aromatic and aliphatic hydrocarbons, and high temperatures up to 400 degrees F. The reviewer found the rings offer consistent dimensions, good leak resistance in cylinder overlaps, and solid durability for applications like fuel bottle seals, firearm barrel seals, and other small hydraulic or vacuum uses.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Made from Viton fluorocarbon elastomer to resist fuels, many chemicals, ozone, and weathering for long service life.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature range:\u003c\/strong\u003e Rated from -15 degrees F to 400 degrees F, providing reliable sealing in hot engine or heated-fluid environments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurometer:\u003c\/strong\u003e 75A hardness gives a balance of flexibility and resistance to penetration useful for static and some dynamic seals.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eForm factor:\u003c\/strong\u003e Round cross-section and precise 2in ID with 2-3\/8in OD dimensions make it suitable for cylindrical overlapping surfaces and common replacement needs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandards:\u003c\/strong\u003e Manufactured to the AS568A sizing standard so sizes match common O-ring dimensions used in industry and plumbing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eValue pack:\u003c\/strong\u003e Supplied in a pack of 25 which keeps spares on hand for maintenance and replacement without frequent reordering.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThese O-rings are aimed at technicians, hobbyists, and maintenance personnel who need chemical- and heat-resistant seals for non-flammable hydraulic fuels, silicone oils, and various hydrocarbons. They work well as replacements on MSA fuel bottles, Remington barrel seals, Silencerco switchback parts, and similar cylindrical assemblies.\u003c\/p\u003e\n\u003cp\u003eUsers who require resistance to low molecular organic acids, ammonia gas, strong alkalis, amines, glycol-based brake fluids, or super-heated steam should look for a different elastomer, since Viton is vulnerable to those specific media.\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\u003eConsistent fit and dimensions that customers report work well for common replacement tasks.\u003c\/li\u003e\n\u003cli\u003eExcellent heat and fuel resistance makes these reliable in hot or hydrocarbon-exposed environments.\u003c\/li\u003e\n\u003cli\u003eGood durability and leak resistance when seated correctly in cylindrical overlaps.\u003c\/li\u003e\n\u003cli\u003ePack of 25 offers strong value for repair kits and spare inventories.\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 certain chemicals like ammonia, amines, alkalis, and glycol-based brake fluids, limiting use in some specialty systems.\u003c\/li\u003e\n\u003cli\u003e75A hardness may be firmer than needed for some very low-pressure static seals where a softer compound is preferred.\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\u003eInside diameter (ID)\u003c\/td\u003e\n\u003ctd\u003e2 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutside diameter (OD)\u003c\/td\u003e\n\u003ctd\u003e2-3\/8 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 329 Viton O-Ring pack is a pragmatic choice for anyone needing robust, heat- and fuel-resistant seals in cylindrical applications. It is good value as a pack of 25, meets AS568A sizing, and performs reliably in common replacement roles, though users handling ammonia, amines, or glycol fluids should choose a different material.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eAre these O-rings compatible with gasoline and diesel?\u003c\/strong\u003e\u003cbr\u003eYes, Viton is compatible with many fuels and aromatic and aliphatic hydrocarbons, making these suitable for many fuel-related seals.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWill the 75A hardness work for dynamic shafts?\u003c\/strong\u003e\u003cbr\u003e75A is better suited to static seals and light dynamic service; very dynamic or reciprocating shafts may need a different formulation or lower durometer.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDo these rings follow standard sizing so replacements fit?\u003c\/strong\u003e\u003cbr\u003eYes, they are made to AS568A sizing so they match common O-ring dimension standards for easy replacement.\u003c\/p\u003e","brand":"Mr O-Ring","offers":[{"title":"Default Title","offer_id":48646345490651,"sku":"B000FMYSQK","price":56.09,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/81iyYJCP7YL._SL1500_24c1509b-f4b2-4e32-9e84-7d32fb6ad1d0.jpg?v=1778554917","url":"https:\/\/gearmusthave.com\/products\/329-viton-o-ring-2in-id-75a-pack-of-25-chemical-heat-resistant","provider":"GearMustHave","version":"1.0","type":"link"}