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.

4" x 1.25" Rubber Casters

Plate sizes: 2-1/2 x 3-1/2, 2-1/2 x 3-5/8, 2-11/16 x 3-5/8Bolt holes: 1-3/4 x 2-13/16Diameter: 4 inTread: 1-1/4 inCapacity: up to 300 lb

22 Series (To 325 Lb/Ea) rubber casters sized for finished floors and quiet institutional carts. Catalog chips cover top plates around 2-1/2 x 3-5/8, wheel diameters 4 in, and rubber treads. Replace worn corners in matched sets when possible so the cart tracks straight under load. Use kingpinless or heavy plate series when shock loads keep shearing kingpin races. These light-duty options cover everyday finished floors and quiet institutional carts without jumping to extreme forged series.