Trailer Axle Spindle – #84 – Machined for Brake Flange (SP-20084M)
Round Spindle · 2.00" Journal · 3.37" Tube · Type 2 Profile · Non-Lube
The SP-20084M is a #84 capacity trailer axle spindle that shares the same overall geometry and bearing journals as the standard SP-20084, but with one critical difference: it is machined for a brake flange.
This machining shortens the rear tube land (Dimension B) to allow proper seating of a welded brake mounting flange while maintaining the same bearing, seal, and nut stack dimensions forward of the flange.
Dimension Reference (Diagram Above)
| A | Spindle bearing journal diameter (inner bearing surface) |
| B | Rear tube land length. Shortened on SP-20084M (2.65") to allow brake flange installation. |
| C | Overall spindle length from tube end to thread end (unchanged from SP-20084) |
| D | Seal journal diameter |
| E | Inner bearing journal diameter |
| F | Outer bearing journal diameter |
| M | Threaded section for spindle nut and retaining hardware |
Fitment & Application
- #84 spindle capacity (commonly ~1,750 lb per spindle)
- Designed for welded brake flange installations
- Accepts standard #84 bearings and seals
- Round axle tube compatibility: 3.37"
- Type 2 spindle profile
Important: The SP-20084M is dimensionally identical to the SP-20084 forward of the flange location. The only functional difference is the reduced B dimension, which creates the correct shoulder for brake flange welding.