3,500 lb Trailer Axle Build Kit – 84" Hub Face – 5 on 4.5" – 10" Electric Brakes
Complete 3,500 lb electric brake axle build kit designed for use with standard 2" Schedule 40 steel pipe (2.375" OD, 2.04" ID). Kit includes pre-welded EZ Lube spindles with brake flanges aligned and square, 10" electric brake assemblies, hub drums, bearings, seals, hardware, and spring perches. Axle tube or pipe is not included.
R&P Knowledge Hub
3,500 lb trailer axles commonly use 10" x 2" electric brake assemblies paired with L68149 inner and L44649 outer bearings. EZ Lube spindles incorporate an internal grease passage to simplify maintenance.
Proper brake flange alignment and spindle squareness are essential for even braking and hub rotation. Spring perch placement must match the trailer’s leaf spring spacing. Confirm bolt pattern, bearing sizes, hub face dimension, and spring centers prior to welding.
Kit Includes
- 2 – EZ Lube Spindles with Brake Flanges (Pre-Aligned & Welded)
- 2 – 10" Hub Drums, 5 on 4.5" Bolt Pattern (Races Installed)
- 2 – 10" Electric Brake Assemblies (Left & Right)
- 2 – L68149 Inner Bearings (1-3/8")
- 2 – L44649 Outer Bearings (1-1/16")
- 2 – 1.75" Double-Lip Grease Seals
- 2 – 1.98" EZ Lube Dust Caps with Rubber Plug
- 10 – 1/2"-20 Lug Nuts
- 2 – 2.375" Weld-On Spring Perches
- 8 – 7/16" Fine Thread Nuts (Brake Mount Hardware)
Spindle Specifications
| Specification | Detail |
| Axle Capacity | 3,500 lb |
| Hub Face Dimension | 84" |
| Brake Size | 10" x 2" Electric |
| Bolt Pattern | 5 on 4.5" |
| Weld Base Diameter | 2" |
| Shaft Length | 3.37" |
| Overall Length | 8.25" |
| Brake Flange Width | 3.75" |
| Bottom of Spindle to Flange | 2.5" |
| Top of Flange to Top of Spindle | 5.25" (excluding zerk) |
Brake & Drum Details
Includes common 10" x 2" electric brakes and 5 on 4.5" hub drums with races installed. Bearings, seals, mounting hardware, lug nuts, and EZ Lube dust caps with removable rubber plugs are included.
Bolt Pattern Guide
The included hubs use a 5 on 4.5" bolt pattern. On 5-lug hubs, measure from the center of one stud to the far edge of the stud across while skipping one stud. The measurement should be approximately 4.5".
Verify specifications before installation.
