20T Idler Bore 5mm Width 9mm by Runice

Runice 20T GT2 toothed idler for 9mm belt motion systems. This is a 5mm-bore, 14mm-height idler for 2mm-pitch GT2/2GT belt paths where a toothed idler is the right match for the belt teeth.

Why use a toothed idler

• Keeps the belt teeth supported around direction changes instead of running a toothed belt over a plain bearing stack.
• Matches common 3D-printer motion hardware using 5mm shafts and wider 9mm GT2 belts.
• Pairs cleanly with live 9mm belt stock such as Gates LL-2GT 9mm RF timing belt or Gates LL-2GT 9mm EPDM high-temp belt.

Specifications

• Brand: Runice
• Manufacturer model: IDLER-P20-2GT-9-A-P5-H14
• Tooth count: 20T
• Belt profile: 2GT / GT2, 2mm pitch
• Belt width: 9mm
• Bore: 5mm
• Overall height: 14mm
• Factory family reference: Runice P20-2GT idler series; Runice lists the 14mm-height 5mm-bore family with MR95ZZ bearings.

Fitment notes

• Use this where your BOM calls for a 20T GT2/2GT idler with 5mm bore and 9mm belt width.
• For 6mm belt paths, use the sibling 20T Runice 6mm-width idler instead.
• Do not clamp the bearing stack axially; shim the shoulder bolt/shaft so the idler spins freely under belt tension.

What it is not

• Not a drive pulley for a motor shaft; for a toothed drive pulley, use a matching pulley such as the Runice black 20T 9mm-width pulley.
• Not a 3mm-bore idler and not intended for 6mm belt runs.