{"product_id":"cascade-638248","title":"Cascade 638248 - Ring - Back UP","description":"\u003cp\u003eA back-up ring fitted behind an O-ring to stop the seal extruding into the clearance gap under pressure. Used throughout Cascade attachment cylinders and valve blocks.\u003c\/p\u003e\u003ch3\u003eKey details\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003ePrevents O-ring extrusion at higher working pressures\u003c\/li\u003e\n\u003cli\u003eFitted on the low-pressure side of the O-ring — orientation matters\u003c\/li\u003e\n\u003cli\u003eAlways replaced together with the O-ring it supports\u003c\/li\u003e\n\u003cli\u003eMaterial and cross-section are matched to the groove and the seal it backs\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePart number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e638248\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eComponent type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBack-up ring\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePart type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eOEM-grade aftermarket\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFits brand\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCascade\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCategory\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eForklift Attachments\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003ch3\u003eWhere it is used\u003c\/h3\u003e\u003cp\u003eComponents of this type are used across Cascade attachment lines including Carton Clamps, Bale Clamps, Fork Positioners, Rotators, Push\/Pull attachments, Drum Clamps and Hydraulic ReachForks. This is category-level context, not a fitment list — confirm the part number against your own attachment before ordering.\u003c\/p\u003e\u003ch3\u003eService notes\u003c\/h3\u003e\u003cp\u003eNote the original orientation before removal. A back-up ring installed on the wrong side of the O-ring offers no extrusion protection and the seal will fail early.\u003c\/p\u003e\u003ch3\u003eFitment \u0026amp; availability\u003c\/h3\u003e\u003cp\u003eThis is an \u003cstrong\u003eOEM-grade aftermarket\u003c\/strong\u003e replacement manufactured to OE specification. It is cross-referenced to Cascade part number \u003cstrong\u003e638248\u003c\/strong\u003e for identification and is not supplied by the original equipment manufacturer.\u003c\/p\u003e\u003cp\u003eCheck the part number against your model and serial number before ordering. If this item is not showing as available, use \u003cstrong\u003eCheck Availability\u003c\/strong\u003e and our team will confirm lead time and fitment.\u003c\/p\u003e","brand":"Cascade","offers":[{"title":"Default Title","offer_id":49262086029569,"sku":"638248","price":7.6,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0815\/8553\/7281\/files\/getimage_819b5745-5223-4e72-872e-4df6192eab10.jpg?v=1781560656","url":"https:\/\/partpilot.com\/products\/cascade-638248","provider":"Part Pilot","version":"1.0","type":"link"}