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.

6.25" x 4.5" Pneumatic Casters

Plate sizes: 4 x 4-1/2, 4-1/2 x 6-1/4Bolt holes: 2-7/16 x 4-15/16 slotted to 3-3/8 x 5-1/4; 2-5/8 x 3-3/8 slotted to 3 x 3Diameter: 6-1/4, 10.9 inTread: 4-1/8 inCapacity: up to 350 lb

4 x 4-1/2 inch top-plate casters for outdoor and rough-yard carts. Expect wheel diameters 6-1/4, 10.9 in, pneumatic treads, and capacities 350 lb. Softer treads quiet finished floors; harder compounds last longer on chips, heat, and rough concrete. When floors see chemicals or washdowns, prefer sealed bearings and non-absorbent wheel compounds. These light-duty options cover everyday outdoor and rough-yard carts without jumping to extreme forged series.