{"product_id":"238-nitrile-o-rings-10-pack-buna-n-nbr-70a-3-1-2-id","title":"#238 Nitrile O-Rings (10 Pack) - Buna-N NBR 70A - 3-1\/2\" ID x 3-3\/4\" OD x 1\/8\" CS","description":"\u003ch2\u003e#238 Nitrile O-Ring (Buna-N NBR, 70A) - 3-1\/2\" ID x 3-3\/4\" OD x 1\/8\" CS\u003c\/h2\u003e\n\u003cp\u003eStandard AS568 dash size #238 nitrile O-ring - the exact size used across faucets, pumps, filters, and fittings worldwide. Sold as a pack of 10 so you have spares on hand for every rebuild.\u003c\/p\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAS568 Dash Number: -238\u003c\/li\u003e\n\u003cli\u003eInside Diameter: 3-1\/2\" nominal (3.484\" \/ 88.49 mm actual)\u003c\/li\u003e\n\u003cli\u003eOutside Diameter: 3-3\/4\"\u003c\/li\u003e\n\u003cli\u003eCross Section (Width): 1\/8\" (0.139\" \/ 3.53 mm)\u003c\/li\u003e\n\u003cli\u003eMaterial: Nitrile rubber (Buna-N \/ NBR)\u003c\/li\u003e\n\u003cli\u003eHardness: 70A durometer\u003c\/li\u003e\n\u003cli\u003eTemperature Range: -40°F to 250°F\u003c\/li\u003e\n\u003cli\u003eColor: Black | Pack of 10\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eMaterial - Why Buna-N Nitrile\u003c\/h3\u003e\n\u003cp\u003eBuna-N is the workhorse O-ring compound: excellent resistance to petroleum oils, fuels, hydraulic fluids, water, and silicone greases, with good abrasion and tear resistance. Not recommended for ozone\/direct sunlight exposure, brake fluid, ketones, or strong acids - for those, use EPDM or Viton.\u003c\/p\u003e\n\u003ch3\u003eCommon Applications\u003c\/h3\u003e\n\u003cp\u003ePool filter tanks, pump strainer lids, large canister housings, tank fittings.\u003c\/p\u003e\n\u003ch3\u003eHow to Measure an O-Ring\u003c\/h3\u003e\n\u003cp\u003eMeasure the inside diameter (hole to hole) and the cross-section thickness of your old ring, or measure the groove: groove inner diameter = O-ring ID, groove width slightly wider than the cross section. Match both numbers to the chart below - the dash number takes care of the rest.\u003c\/p\u003e\n\u003ch3\u003eAS568 O-Ring Size Chart - Sizes We Stock\u003c\/h3\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eDash #\u003c\/th\u003e\n\u003cth\u003eInside Dia.\u003c\/th\u003e\n\u003cth\u003eOutside Dia.\u003c\/th\u003e\n\u003cth\u003eCross Section\u003c\/th\u003e\n\u003cth\u003eMetric ID\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/pack-of-100-rubber-o-rings-010-70a-durometer-nbr-buna-n-nitrile-black-1-4-id-3-8-od-1-16-width\"\u003e#010\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e1\/4\" (0.239\")\u003c\/td\u003e\n\u003ctd\u003e3\/8\"\u003c\/td\u003e\n\u003ctd\u003e1\/16\" (0.070\")\u003c\/td\u003e\n\u003ctd\u003e6.07 mm ID\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/pack-of-100-rubber-o-rings-011-70a-durometer-nbr-buna-n-nitrile-black-5-16-id-7-16-od-1-16-width\"\u003e#011\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e5\/16\" (0.301\")\u003c\/td\u003e\n\u003ctd\u003e7\/16\"\u003c\/td\u003e\n\u003ctd\u003e1\/16\" (0.070\")\u003c\/td\u003e\n\u003ctd\u003e7.65 mm ID\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/pack-of-100-rubber-o-rings-017-70a-durometer-nbr-buna-n-nitrile-black-11-16-id-13-16-od-1-16-width\"\u003e#017\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e11\/16\" (0.676\")\u003c\/td\u003e\n\u003ctd\u003e13\/16\"\u003c\/td\u003e\n\u003ctd\u003e1\/16\" (0.070\")\u003c\/td\u003e\n\u003ctd\u003e17.17 mm ID\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/pack-of-100-rubber-o-rings-121-70a-durometer-nbr-buna-n-nitrile-black-1-1-16-id-1-1-4-od-3-32-width\"\u003e#121\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e1-1\/16\" (1.046\")\u003c\/td\u003e\n\u003ctd\u003e1-1\/4\"\u003c\/td\u003e\n\u003ctd\u003e3\/32\" (0.103\")\u003c\/td\u003e\n\u003ctd\u003e26.57 mm ID\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/228-nitrile-o-rings-10-pack-buna-n-nbr-70a-2-1-4-id\"\u003e#228\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e2-1\/4\" (2.234\")\u003c\/td\u003e\n\u003ctd\u003e2-1\/2\"\u003c\/td\u003e\n\u003ctd\u003e1\/8\" (0.139\")\u003c\/td\u003e\n\u003ctd\u003e56.74 mm ID\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/pack-of-10-230-rubber-o-rings-70a-durometer-nbr-buna-n-nitrile-black-2-1-2-id-2-3-4-od-1-8-width\"\u003e#230\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e2-1\/2\" (2.484\")\u003c\/td\u003e\n\u003ctd\u003e2-3\/4\"\u003c\/td\u003e\n\u003ctd\u003e1\/8\" (0.139\")\u003c\/td\u003e\n\u003ctd\u003e63.09 mm ID\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e#238 (this size)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e3-1\/2\" (3.484\")\u003c\/td\u003e\n\u003ctd\u003e3-3\/4\"\u003c\/td\u003e\n\u003ctd\u003e1\/8\" (0.139\")\u003c\/td\u003e\n\u003ctd\u003e88.49 mm ID\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/pack-of-1-rubber-o-rings-357-70a-durometer-nbr-buna-n-nitrile-black-5-1-2-id-5-7-8-od-3-16-width\"\u003e#357\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e5-1\/2\" (5.475\")\u003c\/td\u003e\n\u003ctd\u003e5-7\/8\"\u003c\/td\u003e\n\u003ctd\u003e3\/16\" (0.210\")\u003c\/td\u003e\n\u003ctd\u003e139.07 mm ID\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eInstallation Tip\u003c\/h3\u003e\n\u003cp\u003eWipe the groove clean and apply a thin film of silicone grease before seating the ring - it prevents pinching and doubles seal life on anything that gets opened regularly, like filter housings.\u003c\/p\u003e\n\u003ch3\u003eWhy Buy From Rubberfeetwarehouse\u003c\/h3\u003e\n\u003cp\u003eGenuine 70A Buna-N, ships fast from our South Carolina warehouse. Need a different size or larger quantity? Contact us.\u003c\/p\u003e","brand":"Rubberfeetwarehouse","offers":[{"title":"Default Title","offer_id":45657725141101,"sku":"ORING23810PCS","price":7.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0661\/8741\/files\/230Oring.jpg?v=1730456526","url":"https:\/\/www.rubberfeetwarehouse.com\/products\/238-nitrile-o-rings-10-pack-buna-n-nbr-70a-3-1-2-id","provider":"Rubberfeetwarehouse","version":"1.0","type":"link"}