Aluminum Alloy Single Groove Pulley 31x15x8mm With 8mm Bore For 3 To 5mm PU Belts, Compact Belt Drive Component For DIY Drills, Mini Milling Machines, And Small Spindles, Lightweight Durable Precision Part For Space Saving Machines

Aluminum Groove Step Pulley for 3-5mm PU Belts 31x15x8mm
✔️ OD 31mm, bore 8mm, thickness 15mm, fits 3-5mm PU belts

This aluminum alloy single groove pulley is built for compact belt drives in small machines. It's commonly used on DIY drills, mini milling machines, or small spindles where space is tight and precision matters.

✅ Material: Aluminum alloy
✅ Diameter: 31 mm (1.22 in)
✅ Bore: 8 mm (0.31 in)
✅ Thickness: 15 mm (0.59 in)
✅ Groove diameter: 16 mm (0.63 in)
✅ Weight: 15 g
✅ Belt compatibility: 3-5 mm PU belts
✅ Package: 1 piece per order

💡 What is an aluminum groove pulley used for in small DIY machines?

In simple terms, it helps transfer rotational motion from a motor to a belt in tight spaces.

• Best suited for compact belt drives in hobby CNCs, drills, and mini machines
• Supports 3-5 mm PU round belts for smooth speed changes
• Helps maintain alignment and reduces belt slip in light-duty setups
• Easy to replace and integrate with other pulleys and shafts