20Teeth Perlin Pulley GT2 without teeth 3mm Bore for Belt 6mm Idler Wheel

The 20 Teeth GT2 Perlin Pulley (Idler Pulley without Teeth) is a toothless, smooth idler wheel designed to guide and support 6mm wide GT2 timing belts. With a 3mm inner bore, it's ideal for use with small shafts or bolts in belt tensioning systems for 3D printers, CNC machines, and linear motion platforms.

Unlike standard toothed pulleys, this idler is toothless (smooth), reducing belt wear and enabling quiet, low-friction operation. It acts as a passive guide or tensioner to maintain belt alignment without engaging the belt teeth directly, making it ideal for the return path of belt loops.

Specifications:

Pulley Type: GT2 Smooth Idler (No teeth)

Tooth Count (Outer Diameter Reference): 20 teeth size equivalent

Bore Diameter: 3mm

Outer Diameter: ~16mm

Belt Compatibility: GT2 belts, 6mm width

Material: Aluminum body or metal alloy (varies by version)

Width Support: 6mm

Mounting: Through 3mm shaft or bolt

Usage Position: Idler/tensioner side (not drive side)