{"product_id":"m1-78x36-27-viton-o-ring-75a-pack-of-100-mr-o-rings","title":"M1.78x36.27 Viton O-Ring 75A - Pack of 100 Mr O-Rings","description":"\u003cp\u003eIn this review the M1.78x36.27 Viton O-Ring is presented as a practical, no-nonsense sealing solution for technicians and hobbyists who need reliable resistance to fuels and many chemicals. The bottom line: this pack of 100 O-rings offers consistent dimensions and a durable Viton compound that works across a wide temperature range, making it a smart buy for repetitive replacement tasks or for applications where chemical compatibility matters.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Made from Viton (fluorocarbon elastomer), the compound provides strong resistance to fuels and many aggressive chemicals so seals last longer in contact with oils and aromatic hydrocarbons.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHardness:\u003c\/strong\u003e A 75A durometer gives a balance of resilience and compressive strength suitable for static seals and many dynamic low-speed applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCross-section:\u003c\/strong\u003e The round cross-section creates a dependable seal between overlapping cylindrical surfaces, useful for threaded barrel protection and simple shaft seals.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature range:\u003c\/strong\u003e Rated for a broad working range, the material performs from below freezing to elevated temperatures, supporting both cold starts and hot operating conditions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePack size:\u003c\/strong\u003e Supplied as a pack of 100, it reduces downtime and cost per seal for maintenance teams and owners who replace rings frequently.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWho It's For\u003c\/h2\u003e\u003cp\u003eThis O-ring is aimed at mechanics, hobbyists, and maintenance technicians who need a small, consistent metric seal for hydraulics, fittings, threaded barrel protection, or carburetor seats. The chemical resistance and temperature tolerance make it a good fit for non-flammable hydraulic fuels, silicone oil, and many hydrocarbons.\u003c\/p\u003e\u003cp\u003eThose who should look elsewhere include users who require full compatibility with strong alkalies, ammonia gas, glycol-based brake fluids, or continuous super-heated steam exposure; Viton is vulnerable to those media, so select a different elastomer for those specific services.\u003c\/p\u003e\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eGood chemical and fuel resistance thanks to Viton composition, so seals hold up in many service fluids.\u003c\/li\u003e\n\u003cli\u003eBalanced 75A durometer delivers reliable sealing without being overly stiff for most static and low-speed uses.\u003c\/li\u003e\n\u003cli\u003eConsistent metric sizing (36.27 mm ID, 39.83 mm OD, 1.78 mm width) and pack of 100 quantity make inventory and replacements easy.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eNot compatible with some chemicals such as strong alkalis, ammonia, or glycol-based brake fluids, so it is not universal.\u003c\/li\u003e\n\u003cli\u003eThe hardness and material are not ideal for high-speed dynamic rotary seals where specialized compounds are required.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\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\u003eCross-section\u003c\/td\u003e\n\u003ctd\u003eRound\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInner diameter (ID)\u003c\/td\u003e\n\u003ctd\u003e36.27 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOuter diameter (OD)\u003c\/td\u003e\n\u003ctd\u003e39.83 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWidth\u003c\/td\u003e\n\u003ctd\u003e1.78 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePack quantity\u003c\/td\u003e\n\u003ctd\u003e100\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch2\u003eOur Verdict\u003c\/h2\u003e\u003cp\u003eThe M1.78x36.27 Viton O-Ring is a practical, cost-effective choice for routine sealing and protective needs where chemical and temperature resistance matter. Buy it if you need consistent metric O-rings for threaded barrels, carburetor seats, or general maintenance; avoid it only when your application involves known Viton incompatibilities or demanding high-speed rotary sealing.\u003c\/p\u003e\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eAre these O-rings compatible with gasoline and many oils?\u003c\/strong\u003e\u003cbr\u003eYes. Viton is resistant to many fuels and aromatic and aliphatic hydrocarbons, making these suitable for gasoline and many oils.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat temperature range do they support?\u003c\/strong\u003e\u003cbr\u003eThe rings are usable across a broad range from below freezing to elevated temperatures appropriate for most automotive and industrial applications.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many rings come per pack?\u003c\/strong\u003e\u003cbr\u003eThis listing supplies a pack of 100 O-rings, which is convenient for repeated maintenance or stocking spares.\u003c\/p\u003e","brand":"Mr O-Ring","offers":[{"title":"Default Title","offer_id":48689673666779,"sku":"B00NR06WS4","price":129.79,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/611g_BwDJoL._SL1500_aa2eaf4d-8a6b-461b-87f7-ce2fd72c71cc.jpg?v=1778701645","url":"https:\/\/gearmusthave.com\/products\/m1-78x36-27-viton-o-ring-75a-pack-of-100-mr-o-rings","provider":"GearMustHave","version":"1.0","type":"link"}