RALZAOTO Trailer Hub Bearing Kits 4-Set for 7000 lb Axles D42 Spindle — 25580 & 14125A Cones, Seals, Hardware

Complete 4-set hub bearing kit for 7000 lb trailer axles with D42 spindles—everything needed to rebuild or refresh four wheel hubs.

These 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.

Which parts are included and how many pieces will I receive?

Each 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.

• 4 bearing cones (25580) and 4 matching races (25520)
• 4 bearing cones (14125A) and 4 matching races (14276)
• 4 grease seals for 2.250" x 3.376" spindles (22333TB) and 4 for 2.125" x 3.375" spindles (21333TB)
• 4 cotter pins and 4 tang washers for secure castle nut retention

How do these kits improve hub performance during towing?

Replacing 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.

• Precision bearings reduce friction and heat build-up
• Double-lip grease seals keep contaminants out and grease in
• Complete hardware prevents assembly mismatches that cause premature wear

Are these bearings compatible with my trailer axle and spindle?

These 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.

• Fits axles rated up to 7000 lb with #D42 spindle configuration
• Includes two common seal sizes for slight spindle dimension variations
• Use part numbers 25580/25520 and 14125A/14276 to verify fit

What should I expect during installation and maintenance?

Installation 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.

• Press-in races require a suitable driver or hydraulic press
• Pack bearings fully with high-temperature wheel bearing grease
• Torque to manufacturer specs and check endplay before finalizing

Who 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.