Description
The SOUTHWEST WHEEL® Round R104BT8X BT8 Spindle & 4-4″ Bolt Circle Trailer Hub (Part R1BT8BT121E) is a complete hub and spindle assembly designed for light-duty 1,000 lb. capacity (per pair) trailer axles. This compact setup features a 4 on 4″ bolt circle and comes with all necessary bearings, seal, grease cap, and lug nuts for easy installation and reliable performance.
Key Features
- Part Number: R1BT8BT121E
- Brand: SOUTHWEST WHEEL®
- Axle Capacity: 1,000 lbs. (per pair)
- Bolt Circle: 4 on 4″
- Studs: 4 x 1/2″-20 (pre-studded)
- Spindle: Round R104BT8X BT8 Spindle (1″ spindle)
- Bearings: L44643 Inner and Outer
- Spindle Dimensions: Base 1-1/4″, Length 3-3/8″, Overall Length 8-1/4″
- Contents: Hub (pre-raced), Inner & Outer Bearings, Seal, Grease Cap, and Lug Nuts
This TruRyde-style hub and spindle assembly is precision-manufactured for excellent fit, smooth rotation, and long service life. It is ideal for small utility trailers, boat trailers, cargo trailers, and other very light-duty single axle applications.
Questions about this trailer hub and spindle or compatibility with your axle? Call our trailer experts at 1-800-866-3336.
Browse more Trailer Hubs & Spindles.
| Part No | Quantity | Description |
| X1023R | 4 | Nut, Cone 60-Deg |
| RVI-BT-4400 | 1 | Hub, 2K, 440, Cupped & Studded |
| GS-1250DLR | 1 | Seal, Grease 1.25 ID |
| DC-200 | 1 | Grease Cap |
| L-44643 | 2 | Bearing Cone (L44643) |
| R104BT8 | 1 | 1.25″ Round BT8 Spindle |
| FS-SN100 | 1 | 1″ Spindle Nut |
| FA-SW100 | 1 | 1″ Spindle Washer |
| 18X134CP | 1 | Cotter Pin |
