{"product_id":"388-viton-o-ring-75a-19-in-id-19-3-8-in-od-durable-sealing-pack","title":"388 Viton O-Ring 75A, 19 in ID 19-3\/8 in OD - Durable Sealing Pack","description":"\u003cp\u003eIn this review the 388 Viton O-Ring is evaluated for routine repair and maintenance uses where chemical and heat resistance matter. The bottom line: this pack of 100 rings is best for technicians, hobbyists, and maintenance teams who need a reliable, heat- and fuel-resistant replacement O-ring in a common round cross-section. The single biggest reason to buy is material performance - made from Viton fluorocarbon elastomer, these O-rings stand up to high temperatures and many fuels that would degrade ordinary rubber.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Viton construction provides excellent resistance to fuels, aromatic and aliphatic hydrocarbons, and many chemicals, extending service life in harsh environments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature range:\u003c\/strong\u003e Rated from -15 degrees F to 400 degrees F, the material can be used across wide thermal conditions without rapid hardening or softening.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurometer:\u003c\/strong\u003e A shore hardness of 75A gives a balance of elasticity and resistance to penetration for reliable sealing under compression.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShape and fit:\u003c\/strong\u003e The round cross-section is designed to form a consistent seal between overlapping cylindrical surfaces and is suitable for common applications such as fuel bottle and barrel seals.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandards:\u003c\/strong\u003e Manufactured to meet AS568A dimensions, helping ensure interchangeability with standard sizes and predictable fit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eValue pack:\u003c\/strong\u003e Supplied as a pack of 100, making it economical for repeated replacements and inventory for maintenance shops.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWho It's For\u003c\/h2\u003e\u003cp\u003eThis product is aimed at industrial maintenance crews, gunsmiths, and users replacing seals on fuel systems or mechanical assemblies who require chemical and heat resistance. Its compatibility with non-flammable hydraulic fuels, silicone oil, chlorinated and aromatic hydrocarbons makes it useful where conventional elastomers fail.\u003c\/p\u003e\u003cp\u003eThose who should look elsewhere include users who need compatibility with strong alkalis, ammonia gas, glycol-based brake fluids, or super-heated steam, since Viton is vulnerable to these media. Also choose a different material if you require flexibility below -26 degrees C or a much softer or harder durometer than 75A.\u003c\/p\u003e\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eHigh chemical and fuel resistance provides durable performance in demanding environments.\u003c\/li\u003e\n\u003cli\u003eWide usable temperature range supports use from cold storage to high-heat machinery.\u003c\/li\u003e\n\u003cli\u003ePack of 100 offers cost-effective replenishment for frequent maintenance tasks.\u003c\/li\u003e\n\u003cli\u003eMeets AS568A sizing for easier replacement and predictable fit in common applications.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eNot compatible with ammonia, strong alkalis, amines, glycol brake fluids, or super-heated steam, limiting some specialty applications.\u003c\/li\u003e\n\u003cli\u003e75A hardness may be firmer than ideal for some low-pressure, soft-seal needs.\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\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\u003e19 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOuter Diameter (OD)\u003c\/td\u003e\n\u003ctd\u003e19-3\/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 shore hardness\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\u003ch2\u003eOur Verdict\u003c\/h2\u003e\u003cp\u003eThe 388 Viton O-Ring pack is a practical, cost-effective choice for repair shops and users needing a reliable, heat- and fuel-resistant seal. Its combination of Viton chemistry, 75A hardness, and AS568A compatibility make it a smart buy for most fuel, hydraulic, and general sealing tasks, though those needing resistance to strong alkalis or glycol brake fluids should select a different compound.\u003c\/p\u003e\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eAre these O-rings suitable for fuel applications?\u003c\/strong\u003e\u003cbr\u003eYes. Viton is compatible with many fuels, aromatic and aliphatic hydrocarbons, and non-flammable hydraulic fuels listed in the product notes.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill they fit standard AS568A grooves?\u003c\/strong\u003e\u003cbr\u003eYes. The rings meet AS568A dimensions and are intended to be interchangeable with standard sizes in that series.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan they be used with brake fluid or ammonia?\u003c\/strong\u003e\u003cbr\u003eNo. Viton is vulnerable to glycol-based brake fluids and ammonia gas, so an alternate seal material is recommended for those fluids.\u003c\/p\u003e","brand":"Mr O-Ring","offers":[{"title":"Default Title","offer_id":48201636970715,"sku":"B000MN6JPU","price":1972.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/81iyYJCP7YL._SL1500_fa95fa55-9d22-475c-a0ff-ad435209ca08.jpg?v=1770355730","url":"https:\/\/gearmusthave.com\/products\/388-viton-o-ring-75a-19-in-id-19-3-8-in-od-durable-sealing-pack","provider":"GearMustHave","version":"1.0","type":"link"}