U604ZZ U-Groove Slideway Roller Wheel Bearing 4x13x4 mm
Part number: U604ZZ3D Printer & CNC Parts
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Prices updated: 13 Oct 2026
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About this product
The U604ZZ is a U-groove roller wheel with a 4 mm bore, 13 mm outside diameter and 4 mm width, designed to run along U-shaped slideways in 3D printer and CNC gantries. Its ZZ metal shields help keep dust out of the rolling elements.
Specifications
- Inner diameter
- 4 mm
- Outer diameter
- 13 mm
- Width
- 4 mm
- U-groove bottom diameter
- 11 mm
- U-groove radius
- 1 mm
- Slot width
- 2.1 mm
- Shielding
- ZZ (metal shields both sides)
Frequently asked questions
Will it fit V-slot aluminium extrusion?
No. This wheel has a U-groove for U-shaped rails. V-slot extrusions need V-groove wheels.
What does ZZ mean?
ZZ means the bearing has metal shields on both sides. They protect the rolling elements from dust but are not rubber seals, so the bearing is not fully waterproof.
