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. |
Part Number: 21-36 Billet-KitX2
Heavy-duty billet aluminum oil bath caps designed to replace standard 4.0" threaded plastic oil caps commonly used on select Dexter oil bath hub assemblies. Precision machined from solid billet aluminum for durability, corrosion resistance, and long service life. Ideal upgrade solution for cracked, leaking, or damaged clear plastic caps.
| Cap Diameter | 4.0" |
| Thread Count | 12 Threads |
| Material | Billet Aluminum |
| Application | Oil Bath Hub |
| Replacement Reference | Dexter 21-36 |
| Quantity Included | 2 Complete Caps |
| Casting Number | Application |
| 9-44 | Oil Bath Hub |
| 9-27 | Oil Bath Hub |
| 9-28 | Oil Bath Hub |
This cap will not fit certain 10K (2009 and newer) general duty Dexter axles. Verify cap diameter, thread count, and hub casting number before ordering.
