{"product_id":"ralzaoto-trailer-hub-bearing-kits-4-set-for-7000-lb-axles-d42-spindle-25580-14125a-cones-seals-hardware","title":"RALZAOTO Trailer Hub Bearing Kits 4-Set for 7000 lb Axles D42 Spindle — 25580 \u0026 14125A Cones, Seals, Hardware","description":"\u003cp\u003e\u003cstrong\u003eComplete 4-set hub bearing kit for 7000 lb trailer axles with D42 spindles—everything needed to rebuild or refresh four wheel hubs.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThese RALZAOTO kits bundle matched bearing cones and races, double-lip grease seals, cotter pins and tang washers to service up to four trailer hubs that use 1.25\"–1.75\" bearings on 7000 lb axles with #D42 spindles. The components are manufactured for long life and low noise, and they’re intended to restore smooth rotation, reduce friction in the hub assembly, and prevent grease leakage from the spindle area.\u003c\/p\u003e\n\n\u003ch3\u003eWhich parts are included and how many pieces will I receive?\u003c\/h3\u003e\n\n\u003cp\u003eEach order contains four complete hub kits (one per wheel) with all hardware required for a standard axle hub rebuild. Parts are matched by size so you get the correct cones, races and seals for D42 spindle applications.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003e4 bearing cones (25580) and 4 matching races (25520)\u003c\/li\u003e\n  \u003cli\u003e4 bearing cones (14125A) and 4 matching races (14276)\u003c\/li\u003e\n  \u003cli\u003e4 grease seals for 2.250\" x 3.376\" spindles (22333TB) and 4 for 2.125\" x 3.375\" spindles (21333TB)\u003c\/li\u003e\n  \u003cli\u003e4 cotter pins and 4 tang washers for secure castle nut retention\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow do these kits improve hub performance during towing?\u003c\/h3\u003e\n\n\u003cp\u003eReplacing worn cones, races and seals lowers bearing drag and prevents grease loss, which helps the hub rotate smoothly under load. The matched components reduce vibration and operating noise while providing stable support for high-speed rotation.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003ePrecision bearings reduce friction and heat build-up\u003c\/li\u003e\n  \u003cli\u003eDouble-lip grease seals keep contaminants out and grease in\u003c\/li\u003e\n  \u003cli\u003eComplete hardware prevents assembly mismatches that cause premature wear\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eAre these bearings compatible with my trailer axle and spindle?\u003c\/h3\u003e\n\n\u003cp\u003eThese kits are designed for 7000 lb trailer axles that accept bearings in the 1.25\"–1.75\" range and use D42 spindles. Check your existing cone and race part numbers or measure spindle diameters to confirm compatibility before installing.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eFits axles rated up to 7000 lb with #D42 spindle configuration\u003c\/li\u003e\n  \u003cli\u003eIncludes two common seal sizes for slight spindle dimension variations\u003c\/li\u003e\n  \u003cli\u003eUse part numbers 25580\/25520 and 14125A\/14276 to verify fit\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat should I expect during installation and maintenance?\u003c\/h3\u003e\n\n\u003cp\u003eInstallation follows standard hub rebuild procedures: remove the old hub, extract cones and races, press in new races, pack bearings with grease, install cones and seals, then torque and secure with cotter pin and tang washer. Routine inspection and repacking of bearings will keep the assembly functioning reliably.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003ePress-in races require a suitable driver or hydraulic press\u003c\/li\u003e\n  \u003cli\u003ePack bearings fully with high-temperature wheel bearing grease\u003c\/li\u003e\n  \u003cli\u003eTorque to manufacturer specs and check endplay before finalizing\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: This 4-set RALZAOTO offering is aimed at DIYers, fleet maintainers, and trailer repair shops that service 7000 lb trailers with D42 spindles. It’s ideal for restoring worn hubs, performing preventive maintenance before long hauls, or stocking parts for common trailer repairs. If you need matched bearings, seals and the small hardware to rebuild four hubs in one go, this kit provides the components in one convenient package.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Will this kit fit my 7000 lb axle with D42 spindles?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes, these kits are made for 7000 lb axles with #D42 spindles and bearings in the 1.25\"–1.75\" range; verify part numbers or spindle measurements to confirm.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Does the kit include everything needed for four hubs?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes—four cones, four races for each size, eight seals, four cotter pins and four tang washers are included for rebuilding four hubs.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"RALZAOTO","offers":[{"title":"Default Title","offer_id":67586776400057,"sku":"B0F9F19KSK","price":158.93,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0822\/3765\/3177\/files\/ralzaoto-front-package-view.jpg?v=1790492937","url":"https:\/\/redleafauto.ca\/products\/ralzaoto-trailer-hub-bearing-kits-4-set-for-7000-lb-axles-d42-spindle-25580-14125a-cones-seals-hardware","provider":"Redleaf Auto","version":"1.0","type":"link"}