Grub Screw M4 x 4mm Internal Hex for 3D Printer Timing Pulley
Brand: Generic3D Printer & CNC Parts
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Prices updated: 13 Oct 2026
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About this product
An M4 x 4 mm grub screw with an internal hex drive, used to secure a timing pulley to a shaft in 3D printer and CNC builds. Grub screws have no head and tighten directly against the shaft. This listing is sold as a single piece.
Specifications
- Thread size
- M4
- Length
- 4 mm / 4 مم
- Drive type
- Internal hex / سداسي داخلي
- Quantity
- 1 piece / قطعة واحدة
- Application
- Timing pulley / بكرة التوقيت
Frequently asked questions
What is a grub screw used for?
A grub screw locks a pulley or collar onto a shaft. It is tightened with an internal hex key so its tip presses against the shaft.
Is M4 x 4mm the right size for my pulley?
Check the set-screw thread and the pulley's hole size before ordering. This listing is M4 x 4 mm and is intended for timing pulleys.
