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U-Boat Casters and Wheels · 4"–8" · 300–4,400 lb · Polyurethane

Wheels: 8 x 2 in center, 4 x 1-1/4 in endsCaster sets: 1,800 lb per set of 4
Replacement casters, wheels and axle kits for U-boat and stocking carts. A U-boat rides on two 8 in center wheels and smaller swivel casters at the ends, so it can turn in its own length in a store aisle. Polyurethane treads on polyolefin cores roll quietly on sales floors and in back rooms. The single 8 x 2 in P&H wheel is rated 1,200 lb and the 4 in end wheel 300 lb.

How a U-boat rolls

The two large center wheels carry most of the load and act as a pivot. The small casters at each end steady the cart and let it rock slightly, which is why one end lifts a little when you push down on the handle. Replace center wheels and end casters as matched pairs so the cart sits level [S1].

What is here

Item Wheel Rating
Caster and wheel kits for U-boat platform trucks 8 in and 4 in polyurethane 1,800 lb per set of 4
P&H 8 x 2 in replacement wheel Polyurethane 1,200 lb
4 x 1-1/4 in end wheel Polyurethane on polyolefin, -45 to 180°F 300 lb

From product titles and fields [S1].

Measuring a worn cart

  1. Measure wheel diameter and tread width.
  2. Measure the axle diameter and the width between the axle mounts.
  3. For end casters, measure the top plate and bolt holes.

U-boat wheel questions

What size wheels does a U-boat cart use?

Usually two 8 x 2 in center wheels and 4 in swivel casters at the ends.

How much do the U-boat caster kits hold?

The kits here are rated 1,800 lb per set of 4.

Why does my U-boat rock?

The center wheels act as a pivot. If it rocks a lot, the end casters or center wheels are worn and should be replaced in pairs.

Sources

  • [S1] CasterHQ product fields (rated load, diameter, width, wheel and core material, temperature range, mount) and product descriptions for the items on this page, pulled October 20, 2026.

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