Black 20T Pulley Bore 5mm Width 9mm by Runice

Runice 20T 2GT timing pulley for 9mm belt builds. This black-finish Runice drive pulley gives you a 20-tooth 2GT/GT2 tooth profile, a 5mm H7 bore for common NEMA 17 motor shafts, and a set-screw hub for printer motion systems that call for 9mm-class belts.

Why use the 9mm pulley

• 9mm belt class: the wider belt gives more stiffness than a 6mm motion belt when the build calls for it.
• 2GT / GT2 profile: works with 2mm-pitch Gates-style GT2 belts and with GT3 belts that are run on 2GT pulleys.
• Runice drawing-backed dimensions: the product drawing identifies DWG/MPN RLA20-2GT-9-P5-C-H20, 20 teeth, 5mm H7 bore, and 20.0mm overall length.
• Motion-project fit: suitable for Monolith-style and other Voron/DIY printer motion builds that specify a 20T, 5mm-bore pulley for 9mm belt.

Specifications

• Manufacturer: Runice
• MPN / drawing number: RLA20-2GT-9-P5-C-H20
• Tooth profile: 2GT / GT2, 2mm pitch
• Tooth count: 20T
• Bore: 5.000mm H7
• Belt width class: 9mm
• Outer diameter shown on drawing: 15.00mm flange OD; tooth OD shown as 12.22mm
• Overall length shown on drawing: 20.0mm
• Mounting: hub with 2 × M4×0.7 set-screw holes

Pairs with

• Gates LL-2GT 9mm RF timing belt for standard 9mm GT2 motion runs.
• Gates LL-2GT 9mm EPDM high-temp belt for hotter enclosed builds.
• Gates LL-3GT 9mm RF belt when your build wants the higher-performance GT3 belt on 2GT-compatible pulleys.
• Runice 20T 9mm idler when the belt path needs a bearing idler instead of a driven pulley.

Choosing the right one

• Use this pulley when your BOM calls for a 20T pulley, 5mm bore, 9mm belt width.
• If your build uses 6mm belts instead, use the black Runice 20T 6mm pulley.
• If the part rides on a fixed shaft or bearing rather than driving from a motor shaft, you probably need an idler, not this pulley.

What it is not

• Not a bearing idler.
• Not a 6mm belt-width pulley.
• Not a complete motion kit; this is one pulley.