A HUB KIT PRE-GREASED, 655, 3.5K, L68149/L44649 is a trailer wheel hub assembly designed for a 3,500-lb axle. Its main function is to allow the trailer wheel to rotate smoothly while supporting the trailer’s weight and, in some versions, providing braking capability.
The description breaks down like this:
Hub Kit — Complete wheel hub assembly, usually including bearings, races, grease seal, grease cap, lug nuts, and wheel studs.
Pre-Greased — Bearings are already packed with grease, so installation is faster and easier.
655 — Refers to a 6 on 5.5-inch bolt pattern (6 wheel studs spaced on a 5.5" circle).
3.5K — Fits a 3,500-lb trailer axle.
L68149 / L44649 — Bearing numbers:
Inner bearing: L68149
Outer bearing: L44649 These identify the spindle size and compatibility.
Typical functions of this hub kit:
Supports the trailer wheel and tire
Allows smooth wheel rotation
Houses wheel bearings and grease seals
Mounts the wheel to the axle spindle
May include a brake drum for electric or hydraulic trailer brakes depending on model
