Shoulder Idler Screw 8x40mm for CoreXY and H-bot Pulley Systems
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Prices updated: 14 Oct 2026
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About this product
An 8 x 40 mm shoulder idler screw used as an axle for idler pulleys in belt-driven 3D printer kinematics such as CoreXY and H-bot. It is intended for pulley systems that guide the timing belt along its path in a more compact assembly.
Specifications
- Dimensions
- 8 x 40 mm
- Type
- Shoulder idler screw
- Application
- CoreXY and H-bot pulley systems
Frequently asked questions
Which bearing or pulley fits this screw?
Check the bore of your idler pulley or bearing against the shoulder diameter of the screw before assembly. A good match lets the pulley rotate freely on the shoulder.
When should I use the 40 mm version instead of 60 mm?
Use the 40 mm screw when your pulley stack and frame thickness are thinner. Measure the assembly first, so the screw is fully supported without protruding past its intended position.
