{"product_id":"mr-o-ring-385-viton-o-ring-90a-durometer-16-in-id-durable-seal","title":"Mr O-Ring 385 Viton O-Ring 90A Durometer, 16 in ID - Durable Seal","description":"\u003cp\u003eIn this review the Mr O-Ring 385 Viton O-Ring is examined for workshop and industrial sealing needs; it is aimed at technicians, mechanics, and maintenance engineers who need a heat- and chemical-resistant seal in a standard AS568-equivalent size. The bottom line: this single-pack 90A durometer Viton o-ring delivers robust resistance to fuels, oils, ozone and high temperatures while holding tight dimensional tolerances, making it a dependable choice when compatibility and temperature performance are the top priorities.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e The Fluorocarbon rubber (Viton\/FKM) formulation offers excellent resistance to fuels, mineral oils, and many organic solvents for longer service life in harsh fluids.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature range:\u003c\/strong\u003e Rated from -26C (-15F) up to 232C (450F), the o-ring handles very high air temperatures and many thermal cycles without rapid degradation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHardness:\u003c\/strong\u003e The 90A durometer provides a firm seal that resists extrusion and maintains sealing force in pressurized assemblies.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize accuracy:\u003c\/strong\u003e Nominal 16 in ID with actual measured dimensions (15.955 in ID, 16.375 in OD) ensures consistent fit in housings designed to AS568 sizes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChemical versatility:\u003c\/strong\u003e Performs well with petroleum products, diesel and biodiesel blends, methanol or ethanol blends, and many oils and greases, reducing the need for multiple compounds in inventory.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShelf life:\u003c\/strong\u003e Effectively unlimited shelf-life when stored properly, allowing spares to be stocked without rapid aging concerns.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThe Mr O-Ring 385 is best for professionals and advanced DIYers who require a single, reliable o-ring for sealing applications exposed to high temperatures, fuels, or aggressive fluids; examples include fuel system maintenance, hydraulic components, and high-temp rotating or static seals. Its firm 90A hardness suits assemblies where extrusion resistance and predictable compression are important.\u003c\/p\u003e\n\u003cp\u003eThose seeking a softer, low-compression set seal for delicate plastics or very low-temperature flexibility should look at lower durometer elastomers; likewise, this product is a single 1-pack, so operations needing bulk replacement parts may prefer multi-packs offered elsewhere.\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\u003eHigh chemical and temperature resistance from the Viton (FKM) compound reduces seal failure in aggressive environments.\u003c\/li\u003e\n\u003cli\u003eTight actual dimensions and AS568 compatibility make installation straightforward in standard grooves and housings.\u003c\/li\u003e\n\u003cli\u003e90A durometer hardness gives good extrusion resistance and durable sealing under pressure.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e90A hardness is relatively firm and may not suit applications needing a softer seal for delicate mating surfaces.\u003c\/li\u003e\n\u003cli\u003eSold as a single pack here, which may be less convenient for high-volume maintenance programs.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\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\u003eViton (Fluorocarbon rubber, 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 (ID \/ OD \/ CS)\u003c\/td\u003e\n\u003ctd\u003e16 in ID \/ 16-3\/8 in OD \/ 3\/16 in CS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eActual dimensions (ID \/ OD \/ CS)\u003c\/td\u003e\n\u003ctd\u003e15.955 in ID \/ 16.375 in OD \/ 0.210 in CS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMetric dimensions\u003c\/td\u003e\n\u003ctd\u003e405.26 mm ID \/ 415.92 mm OD \/ 5.33 mm 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\u003c\/table\u003e\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eThe Mr O-Ring 385 Viton 90A o-ring is a solid value for anyone needing a chemically resistant, high-temperature seal in a standard AS568 size; its measured dimensions and firm durometer make it particularly suitable for fuel systems, hydraulic parts, and high-temp assemblies. Buy it if compatibility with petroleum products and long-term stability are priorities; consider a different durometer or bulk option if you need softer material or higher quantity.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eIs this o-ring compatible with fuels and biodiesel?\u003c\/strong\u003e\u003cbr\u003eYes; the Viton compound is specified to perform well with petroleum products, diesel and biodiesel blends, and fuel blends with methanol or ethanol.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat size standards does this meet?\u003c\/strong\u003e\u003cbr\u003eThe o-ring is made to match AS568 size standards with nominal 16 in ID and corresponding OD and cross-section dimensions.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan it handle high temperatures in engine or exhaust applications?\u003c\/strong\u003e\u003cbr\u003eYes; the operational range up to 232C (450F) makes it suitable for many high-temp air and engine-adjacent sealing tasks.\u003c\/p\u003e","brand":"Mr O-Ring","offers":[{"title":"Default Title","offer_id":48236741132507,"sku":"B07R74P5RX","price":38.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/51Kuv29LevL._SL1000_9c99d91b-07d3-4a96-b7e9-60633005a1a7.jpg?v=1770883994","url":"https:\/\/gearmusthave.com\/products\/mr-o-ring-385-viton-o-ring-90a-durometer-16-in-id-durable-seal","provider":"GearMustHave","version":"1.0","type":"link"}