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Rubber and polyurethane favor floor protection; phenolic and steel favor heavy capacity. Compare materials →
Kingpinless casters, 4 x 4-1/2 plate in polyurethane, semi-steel and phenolic, 4 to 8 in wheels, rated 550 to 1,500 lb per caster.
| Tread | Core | Wheel sizes | Rated per caster | Listed temperature | Where it fits |
|---|---|---|---|---|---|
| Polyurethane | Cast iron | 4, 5, 6 and 8 in | 700 to 1,400 lb | Up to 180°F | quiet, floor-friendly and long wearing |
| Semi-steel | 4, 5, 6 and 8 in | 700 to 1,400 lb | -40°F to 600°F | rough floors, heat and heavy loads | |
| Phenolic | 4, 5, 6 and 8 in | 800 to 1,400 lb | Up to 250°F | hard and easy rolling on smooth, dry floors | |
| Rubber | Cast iron | 6 and 8 in | 550 to 600 lb | Up to 250°F | cushioned and quiet on finished floors |
| Cast iron | 5 in | Not listed | -40°F to 600°F | heat, chips and heavy loads on rough floors | |
| Ductile iron | Steel | 4 in | 1,500 lb | -40°F to 800°F | heavy loads with better impact strength than cast iron |
Ratings are for single casters of kingpinless casters, 4 x 4-1/2 plate, from product fields [S1].
| Wheel | Treads | Rated |
|---|---|---|
| 4 x 2 in | semi-steel, polyurethane and phenolic | 700 to 1,500 lb |
| 5 x 1-9/16 in | polyurethane | 750 to 770 lb |
| 5 x 2 in | polyurethane, phenolic and semi-steel | 1,000 lb |
| 6 x 2 in | polyurethane, phenolic and semi-steel | 550 to 1,200 lb |
| 8 x 2 in | polyurethane, phenolic and semi-steel | 600 to 1,400 lb |
Related to kingpinless casters, 4 x 4-1/2 plate: plate casters, 5 x 2 in poly-on-iron casters and 2-3/8 x 3-5/8 plate casters.
Single kingpinless casters, 4 x 4-1/2 plate are rated 550 to 1,500 lb; most fall between 770 and 1,200 lb.
Most kingpinless casters, 4 x 4-1/2 plate use 4 x 4-1/2 in.
Polyurethane leads on kingpinless casters, 4 x 4-1/2 plate, rated 700 to 1,400 lb per caster. Among kingpinless casters, 4 x 4-1/2 plate, semi-steel is next at 700 to 1,400 lb.
