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.

DuraStar Thermoplastic Rubber Casters w/ 5" Wheels · 4 Styles · Up to 350 lb · Ref 226

Plate sizes: 4 x 4-1/2Bolt holes: 2-5/8 x 3-3/8 slotted to 3 x 3Diameter: 5 inTread: 2 inCapacity: up to 350 lb

Match a 4 x 4-1/2 top plate when bolting casters under finished floors and quiet institutional carts. Typical builds show wheel diameters 5 in, thermo rubber (TPR) and rubber treads, and capacities 350 lb. Replace worn corners in matched sets when possible so the cart tracks straight under load. Confirm stem length and thread pitch on stem mounts so the shoulder seats flush in the boss.