Black 20T Idler Bore 5mm Width 6mm by Runice

Runice black 20T 2GT idler for 6 mm belts. This is a toothed GT2/2GT idler pulley with a 5 mm bore, 20-tooth profile, and 6 mm belt path for compact 3D-printer and CNC motion systems.

Why use a toothed idler here?

• Matches the belt tooth form instead of forcing the belt around a smooth bearing surface.
• Built around two bearings with flanges to keep a 6 mm GT2 belt tracking cleanly.
• Black Runice finish suits visible CoreXY and enclosed-printer motion builds.

Specifications

• Manufacturer / drawing: Runice P20-2GT-6-A-P5-H10
• Tooth profile: 2GT / GT2, 20T
• Bore: 5 mm
• Belt width: 6 mm
• Overall flange diameter: 15 mm
• Overall height: 10 mm
• Construction: toothed pulley body with 2 bearings and 2 flanges

Use and fitment

Use this anywhere your design calls for a 20T toothed GT2 idler with a 5 mm bore for 6 mm belt. It is the black version of our 20T 6 mm Runice idler; if your motion system uses 9 mm belt, use the 20T 9 mm Runice idler instead.

Gotchas

• Not a drive pulley: this is an idler, not a shaft-mounted pulley for transferring motor torque.
• Not for 9 mm belts; choose the 9 mm idler if the belt path is wider.
• Do not clamp the bearings axially. Use the correct spacers/shims so the idler spins freely after tightening.

“They do be idlin’”