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.

Under 350 lbs. each
351–675 lbs. each
676–1,250 lbs. each
1,251–2,000 lbs. each
2,001–4,000 lbs. each
4,001–7,500 lbs. each
7,501–10,000 lbs. each
10,001–15,000 lbs. each
15,001–20,000 lbs. each
20,001–30,000 lbs. each
30,000+ lbs. each

3.5" x 1.25" Polyurethane Casters

Plate sizes: 2-1/2 x 3-5/8Bolt holes: 1-3/4 x 2-13/16Diameter: 3-1/2, 4, 5 inTread: 1-1/4 inCapacity: up to 300 lb

This 22 Series (to 325 lb/ea) aisle groups plate-mount casters built for warehouse carts on epoxy and smooth concrete. Typical builds show wheel diameters 3-1/2, 4, 5 in, polyurethane treads, and capacities 250 to 300 lb. Bring plate and stem measurements when replacing unmarked casters so the new corners sit level. Harder poly rolls easier on smooth epoxy; softer poly cushions vibration on uneven slabs.