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.

Ductile & Forged Steel Wheel Casters · Metal-Wheel Strength Tier

These ductile steel wheels hold up to shock and impact on heavy plant carts. The only rated listing in this collection is the 6 x 2 in at 1,500 lb per wheel. Other sizes include 4 x 2, 6 x 3, and 8 x 2 in; check each listing for its rating. Ductile steel resists cracking better than cast iron. It is loud and can mark finished floors. Match the bore, hub length, diameter, and tread width before you order. Capacities below are per wheel unless a listing says set. Confirm the load rating printed on the title before you order. Read the listing for the exact wheel size, overall height, and mount shown. Measure the old wheel or caster before you buy. Verify the bore and hub length match your axle before you buy. Check the floor type and the heaviest load the cart will carry before you choose. Steel wheel aisle: steel wheels. Forged aisle: forged steel wheels.