Up to 350 lbs
Up to 7,000 lbs
Up to 16,000 lbs
Up to 40,000 lbs
Shock absorbing
Outdoor / rough terrain
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All measurements indicate the wheel diameter by the tread width.
The below capacity ranges indicate the working (dynamic) load that each caster will support. A safety factor should be included in your formula to determine your required load rating per caster.
W/(C-1)=R W is total weight needed to move. C is total number of casters required. R is ideal load rating, with safety factor built in. Divide the total load weight by one less caster than you will use to safely determine load rating.
Plate dimensions shown are overall mounting plate size.
When replacing existing casters, select the closest plate size and verify bolt-hole compatibility.
BHP = Bolt Hole Pattern, shown under each plate.





| Brake | Wheel | Caster series |
|---|---|---|
| 3 in Posi-Lock side brake | 3 x 1-1/4 in | 21, 24 |
| 3-1/2 in Posi-Lock side brake | 3-1/2 x 1-1/4 in | 21, 24 |
| 4 in Posi-Lock brake | 4 x 1-1/4 in | 21, 24 |
| 5 in Posi-Lock brake | 5 x 1-1/4 in | 21, 24 |
| 6 in Posi-Lock brake | 6 x 1-1/4 in | 24 only |
From product titles and listings [S1].
Related: Durastar 24 Series casters and Durastar casters.
No. The 6 x 1-1/4 in brake is listed for 24 Series only.
A foot pedal pushes the brake against the wheel to lock it.
Jordan Wilson, CasterHQ · reviewed October 20, 2026 · 844-439-4335 · info@casterhq.com
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