Build-Your-Own 5-Lug Trailer Axle Stub Kit — Square Spindle
Part Number: STUB-BT8-545-SQ
Single stub-end axle kit for building or repairing a light-duty trailer axle assembly. Designed for welding to axle tubing using a 1.50" square spindle tail shaft. Commonly used on utility trailers, side-car trailers, and custom fabricated builds.
Rated at 1,000 lbs per wheel (2,000 lbs total axle capacity). This spindle does not include an EZ Lube grease zerk.
R&P Knowledge Hub
A stub spindle kit is used when fabricating a new axle or replacing a damaged spindle end. The square tail shaft must be welded to compatible axle tubing. Proper weld penetration and alignment are critical to bearing life and load performance.
Capacity rating is based on correct installation, matched bearings (L44643 inner & outer), and appropriate trailer load distribution. Axle tube is not included.
Features
| Feature | Description |
|---|---|
| Spindle Design | 1.50" square weld-on tail shaft |
| Capacity | 1,000 lbs per wheel (2,000 lbs per axle) |
| Hub Pattern | 5 on 4.5 bolt circle |
| Grease System | Standard spindle (no EZ Lube) |
| Application | Utility trailers and custom light-duty builds |
Specifications
| Specification | Detail |
|---|---|
| Part Number | STUB-BT8-545-SQ |
| Total Axle Rating | 2,000 lbs |
| Spindle Base | 1.50" square weld-on tail shaft |
| Bolt Pattern | 5 x 4.5 |
| Bearing Type | L44643 (inner and outer) |
| Seal Size | 1.25" ID — GS-1250DL |
Kit Contents
| Quantity | Component | Part Number |
|---|---|---|
| 1 | Idler Hub — 5 on 4.5 (2,000 lb) | RVI-BT-5450 |
| 1 | Square Spindle — 1.50" Base | SP-150BT8-SQ |
| 5 | 1/2"-20 Lug Nuts | — |
| 1 | Dust Cap Set (1.98") | DC-200L / DC-RP |
| 2 | Bearings — 1.00" | L44643 |
| 1 | Grease Seal — 1.25" ID | GS-1250DL |
| 1 | Spindle Nut | — |
| 1 | Spindle Washer | — |
Axle tubing is not included. Confirm axle tube size, weld specifications, and trailer load rating before installation. Designed for standard grease-packed hubs only.