Fast answer: Heavy duty casters must be sized using dynamic load calculations, proper plate footprint selection, correct wheel width, and kingpinless construction when shock is present.
Load Calculation (Start Here)
Per-caster capacity = Total Load ÷ Number of Casters × 1.3 safety factor.
Plate Size & Frame Strength
| Plate Size | Duty Range |
|---|---|
| 4" x 4-1/2" | Standard Industrial |
| 4-1/2" x 6-1/4" | Heavy Duty |
| 5-1/4" x 7-1/4"+ | Extreme Duty |
Wheel Diameter & Width
Larger diameter reduces push force. Wider tread increases load distribution.
Kingpin vs Kingpinless
Frequent directional changes and shock loading demand kingpinless construction.