Heavy Duty Plastic Caster — Series 40 (4", 5", 6" & 8" x 2")
This Series 40 Medium Heavy Duty plastic caster is available in four wheel sizes — 4" x 2", 5" x 2", 6" x 2", and 8" x 2" — each on a cold-forged steel top plate with a hardened, double-row ball bearing swivel raceway and built-in Zerk lubrication fitting for smooth 360° movement and long service life. Every size is offered in four configurations: Rigid, Swivel, Swivel with Brake (Top Lock), and Swivel with Total Lock. Select your wheel size and configuration from the menu above; the matching specifications are listed below.
Specifications by Size
| Wheel Size |
Load Capacity |
Overall Height |
Swivel Radius |
Tread Width |
| 4" x 2" |
600 lbs |
5-5/8" |
3-3/16" |
2" |
| 5" x 2" |
650 lbs |
6-1/2" |
3-7/8" |
2" |
| 6" x 2" |
750 lbs |
7-1/2" |
4-37/64" |
2" |
| 8" x 2" |
900 lbs |
9-1/2" |
6" |
2" |
Configurations & Part Numbers
| Size |
Type |
Brake |
Part Number |
| 4" x 2" |
Rigid |
— |
40-40R-A1-HP |
| 4" x 2" |
Swivel |
— |
40-40S-A1-HP |
| 4" x 2" |
Swivel with Brake |
Top Lock Brake (TB) |
40-40S-A1-HP-TB |
| 4" x 2" |
Swivel with Total Lock |
Total Lock Brake (TTL) |
40-40S-A1-HP-TTL |
| 5" x 2" |
Rigid |
— |
40-50R-A1-HP |
| 5" x 2" |
Swivel |
— |
40-50S-A1-HP |
| 5" x 2" |
Swivel with Brake |
Top Lock Brake (TB) |
40-50S-A1-HP-TB |
| 5" x 2" |
Swivel with Total Lock |
Total Lock Brake (TTL) |
40-50S-A1-HP-TTL |
| 6" x 2" |
Rigid |
— |
40-60R-A1-HP |
| 6" x 2" |
Swivel |
— |
40-60S-A1-HP |
| 6" x 2" |
Swivel with Brake |
Top Lock Brake (TB) |
40-60S-A1-HP-TB |
| 6" x 2" |
Swivel with Total Lock |
Total Lock Brake (TTL) |
40-60S-A1-HP-TTL |
| 8" x 2" |
Rigid |
— |
40-80R-A1-HP |
| 8" x 2" |
Swivel |
— |
40-80S-A1-HP |
| 8" x 2" |
Swivel with Brake |
Top Lock Brake (TB) |
40-80S-A1-HP-TB |
| 8" x 2" |
Swivel with Total Lock |
Total Lock Brake (TTL) |
40-80S-A1-HP-TTL |
Common Specifications (all sizes)
| Series |
40 — Medium Heavy Duty |
| Wheel Material |
Plastic |
| Tread Width |
2" |
| Axle Diameter |
1/2" |
| Kingpin |
5/8" |
| Bearing |
Roller |
| Top Plate Size |
3-15/16" x 4-1/2" |
| Bolt Hole Spacing |
2-5/8" x 3-5/8" ~ 3" x 3" |
| Mounting Bolt Size |
3/8" |
| Finish |
Zinc Plated |
Key Features
- Plastic wheel — high strength, low rolling resistance
- Four wheel sizes (4", 5", 6", 8" x 2") rated 600–900 lbs per caster
- Cold-forged steel top plate with hardened, double-row ball bearing swivel raceway
- 5/8" kingpin and 1/2" axle with built-in Zerk lubrication fitting
- Rigid, Swivel, Swivel with Brake (Top Lock) and Swivel with Total Lock configurations
- Corrosion-resistant zinc plated finish
Applications & Common Uses
- Utility carts
- Shop equipment
- Warehouse carts
- Carts
- Racks
- Platform trucks
Ideal for platform trucks, stock carts, dollies, workbenches, shelving, and heavy material handling equipment across warehouse, industrial, and commercial settings.
