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

These U-boat casters and wheels rebuild platform trucks that use the tall 8 in and small 4 in wheel pair. Replacement wheels in this collection range from about 300 to 4,400 lb per wheel. Complete U-boat caster sets list about 1,800 lb per set of 4. Polyurethane (poly or urethane) and polyolefin treads cover the shortlist. Soft polyurethane on aluminum (~85 Shore A) or TPR is the better pick when the floor has chips or grit. Match the 8 and 4 in pair, axle, and fork before you order. Capacities below are per wheel unless a listing says set. Platform truck aisle: carts platform trucks. Cart caster aisle: cart casters. Read the listing for the exact wheel size, overall height, and mount shown. Confirm the load rating printed on the title before you place your order today. Keep the load on the rating for that SKU and do not exceed it in service.

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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