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.

Orange Poly-on-Aluminum Casters, 4 x 4-1/2 Plate

These orange poly on aluminum casters use a 4 x 4-1/2 in top plate for heavy carts. Casters in this collection range from 1,000 to 1,250 lb per caster. Wheels in this category range from 4 up to 8 in by 2 in wide. Polyurethane (poly or urethane) on an aluminum core is light, quiet, and floor safe. The aluminum hub will not rust. Soft polyurethane on aluminum (~85 Shore A) or TPR is the better pick when the floor has chips or grit. Match the 4 x 4-1/2 in plate, bolt pattern, and overall height before you order. Choose swivel casters when the cart must turn in place, rigid casters for straight travel, and add a brake when the cart needs to stay put. Read the listing for the exact wheel size, overall height, and mount shown. Confirm the load rating printed on the title before you order. Polyurethane wheel aisle: polyurethane wheels. Plate aisle: plate casters.