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 Spring-Loaded AEZFHS Heavy Service Casters w/ Ergo-Glide XT Wheels · 8" Wheels · Cast Iron

Plate sizes: 4-1/2 x 6-1/2Diameter: 8 inCapacity: up to 1,200 lb

Casters on the 4-1/2 x 6-1/2 plate pattern suit heavy warehouse carts, die carts, and plant fixtures. Catalog chips cover wheel diameters 8 in and capacities 980 to 1,200 lb. Softer treads quiet finished floors; harder compounds last longer on chips, heat, and rough concrete. 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.