Match the part number, measurements and connection points that apply to your trailer.
| Part Number | Match the number stamped on the original bearing or seal. |
|---|---|
| Dimensions | Measure the mating surfaces when a number is unavailable. |
| Hub / Axle | Use capacity as context, not as the only fitment check. |
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.
| 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 |
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.
