{"product_id":"326-o-ring-buna-n-90a-1-5-8in-id-2in-od-pack-of-100-heavy-duty-seal","title":"326 O-Ring Buna-N 90A 1-5\/8in ID 2in OD Pack of 100 - Heavy Duty Seal","description":"\u003cp\u003eIn this review the 326 O-Ring made of black Buna-nitrile is presented for users who need a reliable, heavy-duty seal in hydraulic, plumbing, and general industrial applications. The single biggest reason to buy is durability: with a 90A durometer and Buna-N chemistry this pack of 100 rings resists abrasion, tear and compression set better than softer elastomers, making it a practical choice where a firm, long-lasting seal is required. The review focuses on fit, compatibility with common fluids, and real-world performance reported by customers.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Buna-nitrile composition provides compatibility with petroleum, HFCs, vegetable oil, alcohol and many aliphatic hydrocarbons, reducing swap-outs for common fluids.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHardness:\u003c\/strong\u003e 90A durometer gives a stiff, resilient seal that holds shape under pressure and resists extrusion in tight dynamic or static assemblies.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 1-5\/8in ID and 2in OD with a 3\/16in cross-section follows Aerospace Standard AS568A sizing, simplifying replacement and inventory.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature range:\u003c\/strong\u003e Usable from -40 degrees F to 212 degrees F, covering cold-starts through hot-fluid applications without rapid degradation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDesign:\u003c\/strong\u003e Round cross-section seals between cylindrical overlapping surfaces, delivering a simple, proven sealing geometry for couplers and fittings.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePack quantity:\u003c\/strong\u003e Sold as a pack of 100 which is economical for shops, maintenance teams, and repeated installation tasks.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWho It's For\u003c\/h2\u003e\u003cp\u003eThe 326 O-Ring is best for technicians, maintenance crews, and hobbyists who need a stout, repeatable seal for hydraulic couplers, garden hose quick disconnects, marine gear, and other equipment exposed to petroleum or aliphatic fluids. Its AS568A-compatible sizing and 100-count package make it convenient for stocking and frequent repairs.\u003c\/p\u003e\u003cp\u003eThose who need very soft or highly flexible O-rings for low-pressure static seals or applications involving strong solvents like acetone, esters or prolonged ozone exposure should look for a different elastomer, since Buna-N is vulnerable to some solvents and weathering.\u003c\/p\u003e\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eDurable 90A hardness provides strong abrasion and tear resistance for demanding sealing tasks.\u003c\/li\u003e\n\u003cli\u003eBroad fluid compatibility with common petroleum and hydrocarbon fluids reduces the need for multiple materials.\u003c\/li\u003e\n\u003cli\u003eAS568A sizing and a pack of 100 deliver convenient replacement and good value for workshops.\u003c\/li\u003e\n\u003cli\u003eWorks across a wide temperature range for versatile service in many environments.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eStiffness is noticeable; some customers report the rings feel hard like plastic which can make installation tougher in tight grooves.\u003c\/li\u003e\n\u003cli\u003eNot suitable for use with acetone, esters, ethers or prolonged ozone and sunlight exposure.\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\u003eBuna-nitrile (Buna-N)\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\u003eInner diameter (ID)\u003c\/td\u003e\n\u003ctd\u003e1-5\/8in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOuter diameter (OD)\u003c\/td\u003e\n\u003ctd\u003e2in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCross-section width\u003c\/td\u003e\n\u003ctd\u003e3\/16in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTemperature range\u003c\/td\u003e\n\u003ctd\u003e-40 degrees F to 212 degrees F (-40 C to 100 C)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStandards\u003c\/td\u003e\n\u003ctd\u003eMeets Aerospace Standard AS568A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch2\u003eOur Verdict\u003c\/h2\u003e\u003cp\u003eThe 326 Buna-N 90A O-Ring pack is a sensible buy for anyone who needs a tough, repeatable seal for petroleum and hydrocarbon service where firmness and abrasion resistance matter. Pack of 100 pricing and AS568A sizing make it cost-effective for maintenance shops and DIYers, but those requiring softer compounds or resistance to strong solvents should choose a different material.\u003c\/p\u003e\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eAre these compatible with hydraulic couplers?\u003c\/strong\u003e\u003cbr\u003eYes, customers report successful use eliminating hydraulic leaks on couplers when correct AS568A size is applied.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill they handle hot water or steam?\u003c\/strong\u003e\u003cbr\u003eThe rings are rated to 212 degrees F, suitable for many hot water uses but not for high-pressure steam service beyond that temperature.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eAre these easy to install?\u003c\/strong\u003e\u003cbr\u003eThe 90A hardness makes them stiffer than softer O-rings, so installation in tight grooves can be firmer and may require lubrication or care to avoid nicking.\u003c\/p\u003e","brand":"Mr O-Ring","offers":[{"title":"Default Title","offer_id":48741628838107,"sku":"B00M905HUM","price":32.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/514anOq3sCL._SL1224_3b51d631-14e9-4fc2-91b5-99791bb5fa8b.jpg?v=1778946543","url":"https:\/\/gearmusthave.com\/products\/326-o-ring-buna-n-90a-1-5-8in-id-2in-od-pack-of-100-heavy-duty-seal","provider":"GearMustHave","version":"1.0","type":"link"}