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.

12" x 3" Poly-on-Iron Casters

Plate sizes: 5-1/4 x 7-1/4Bolt holes: 3-3/8 x 5-1/4 slotted to 4-1/8 x 6-1/8Diameter: 12 inTread: 3 inCapacity: up to 3,500 lb

5-1/4 x 7-1/4 inch top-plate casters for warehouse carts on epoxy and smooth concrete. Typical builds show wheel diameters 12 in, polyurethane and cast iron treads, and capacities 3,500 lb. For dual-wheel or wide treads, check fork clearance and swivel radius in tight aisles. Larger plates spread bolt stress on thick frames under continuous tow abuse. Replace worn corners in matched sets when possible so the cart tracks straight under load.