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.

Hamilton Whirlaway WW Casters w/ Aqualite Wheels · 6" Wheels · Up to 850 lb

Plate sizes: 4 x 4, 4 x 4-1/2Bolt holes: 2-5/8 x 3-3/8 slotted to 3 x 3Diameter: 6 inTread: 1-1/2 inCapacity: up to 850 lb

Casters on the 4 x 4-1/2 plate pattern suit warehouse carts on epoxy and smooth concrete. Catalog chips cover wheel diameters 6 in, polyurethane and rubber treads, and capacities 280 to 850 lb. Match bolt-hole spacing or stem diameter to the frame before you standardize a fleet. Pair swivel and rigid casters for tracking, or use total locks where the cart must park on a grade.