Shoulder Idler Screw 8x30mm for CoreXY and H-Bot Pulley Systems
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Prices updated: 13 Oct 2026
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About this product
Shoulder idler screw measuring 8x30mm, designed to act as the axle for idler pulleys in belt-driven 3D printer motion systems. It is commonly used in CoreXY and H-bot kinematics to guide the timing belt path, and suits DIY 3D printer and CNC builds.
Specifications
- Size
- 8x30 mm
- Application
- Idler pulley axle for CoreXY and H-bot systems
Frequently asked questions
What is a shoulder idler screw used for?
It acts as the axle for an idler pulley, letting the belt run freely while keeping the pulley positioned in a belt-driven system such as CoreXY or H-bot.
How do I make sure it fits my idler pulley?
Check that the shoulder of the screw matches the bearing bore of your idler pulley before installing it, and confirm the 30 mm length suits your frame.
