{"product_id":"277-silicone-o-ring-70a-durometer-11-1-2-in-id-pack-of-10-durable","title":"277 Silicone O-Ring 70A Durometer 11-1\/2 in ID Pack of 10 - Durable","description":"\u003cp\u003eIn this review the Mr O-Ring 277 Silicone O-Ring is assessed for workshop and maintenance use where heat tolerance and ozone resistance matter most. The bottom line: this pack of ten red, 70A durometer silicone o-rings is aimed at technicians, hobbyists and facilities managers who need reliable sealing across a wide temperature range; the single biggest reason to buy is its combination of AS568 sizing accuracy and silicone's exceptional performance from -60C to 225C, which makes it a safe, versatile choice for many static and low-movement seals.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e277 Silicone material:\u003c\/strong\u003e provides excellent heat, ozone and corona resistance so seals last in hot or outdoor environments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e70A durometer:\u003c\/strong\u003e balances flexibility and firmness for dependable compression in static and mild-dynamic sealing applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePack of 10:\u003c\/strong\u003e gives spare parts on hand for routine maintenance or small production runs without frequent reordering.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAS568 compliant sizing:\u003c\/strong\u003e nominal and actual dimensions match standard sizes so replacements fit predictable housings and grooves.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWide temperature range:\u003c\/strong\u003e rated from -60C (-76F) to 225C (437F), suitable for engine bay, oven or exterior uses where temperatures vary widely.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFDA-compliant:\u003c\/strong\u003e safe for incidental contact applications where regulatory compliance matters.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThis product is best for maintenance technicians, HVAC and plumbing professionals, small engine repairers and hobbyists who need a reliable silicone seal rated for broad temperatures and exposure to ozone, mild water and common mineral oils. The pack size and standard AS568 dimensions make it convenient for shops that perform routine replacements.\u003c\/p\u003e\n\u003cp\u003eThose seeking high-wear, dynamic sealing under heavy friction or high-pressure hydraulic seals should look at other elastomers with higher tensile strength and wear resistance, since silicone has lower wear resistance compared with some fluorocarbon or nitrile compounds.\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\u003eExcellent thermal and ozone resistance suitable for hot or outdoor installations.\u003c\/li\u003e\n\u003cli\u003eStandard AS568 sizing and measured actual dimensions make it easy to swap into existing grooves.\u003c\/li\u003e\n\u003cli\u003ePack of ten offers value and convenience for maintenance and spare-part inventories.\u003c\/li\u003e\n\u003cli\u003eFDA-compliant and compatible with many mineral oils and diluted salt solutions.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eLower tensile strength and wear resistance than some alternative elastomers, so not ideal for heavy abrasion or high-friction dynamic seals.\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\u003e277 Silicone\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDurometer\u003c\/td\u003e\n\u003ctd\u003e70A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal dimensions\u003c\/td\u003e\n\u003ctd\u003e11-1\/2 in ID, 11-3\/4 in OD, 1\/8 in CS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eActual dimensions\u003c\/td\u003e\n\u003ctd\u003e11.484 in ID, 11.762 in OD, 0.139 in CS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMetric dimensions\u003c\/td\u003e\n\u003ctd\u003e291.69 mm ID, 298.75 mm OD, 3.53 mm CS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTemperature range\u003c\/td\u003e\n\u003ctd\u003e-60C (-76F) to 225C (437F)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePack size\u003c\/td\u003e\n\u003ctd\u003e10 o-rings\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eThe Mr O-Ring 277 Silicone 70A pack is a sensible purchase for anyone needing accurate, heat-resistant replacement o-rings in a commonly used AS568 size. It represents good value for maintenance shops and hobbyists who prioritize temperature range and ozone resistance, though users with heavy-duty dynamic wear needs should select a harder-wearing compound.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eAre these o-rings the stated dimensions?\u003c\/strong\u003e\u003cbr\u003eYes, the listing provides both nominal and measured actual dimensions so you can confirm fit for standard AS568 grooves.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan they be used with engine oil?\u003c\/strong\u003e\u003cbr\u003eThey perform well with engine and transmission mineral oils, but check compatibility for specific synthetic fluids or aggressive chemicals.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDo they tolerate outdoor exposure?\u003c\/strong\u003e\u003cbr\u003eYes, silicone offers good ozone and weather resistance suitable for many exterior sealing applications.\u003c\/p\u003e","brand":"Mr O-Ring","offers":[{"title":"Default Title","offer_id":48749032177883,"sku":"B07R62SQS9","price":43.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/61ukWwhsVjL._SL1500_4c4190f2-4424-4466-b5f0-4ab57c59fd00.jpg?v=1778887965","url":"https:\/\/gearmusthave.com\/products\/277-silicone-o-ring-70a-durometer-11-1-2-in-id-pack-of-10-durable","provider":"GearMustHave","version":"1.0","type":"link"}