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

Black Runice GT2 20-tooth timing pulley for 5 mm motor shafts and 6 mm belts. This is the black-finished Runice RLA20-2GT-6-C-P5-H16 pulley used in precise belt-driven motion systems such as Voron-style 3D printers.

Why this pulley

• 2GT / GT2, 20-tooth profile for common 3D-printer XY and motion drives.
• 5 mm bore fits the standard shaft size on many NEMA 17 stepper motors.
• 6 mm belt width matches common Gates and GT2 belt layouts.
• Two M4 set screws clamp the pulley to the shaft; the flanged body helps keep the belt tracked.
• Black finish for builds where the visible motion hardware should stay dark.

Specifications

• Manufacturer: Runice
• Manufacturer drawing / MPN: RLA20-2GT-6-C-P5-H16
• Tooth profile: 2GT / GT2
• Tooth count: 20T
• Bore: 5.000 mm H7
• Belt width: 6 mm
• Overall length: 16.0 mm
• Set screws: 2 × M4 × 0.7
• Finish: black

Fitment and pairing

This pulley is listed in the Voron 2.4 Motion Kit BOM as the 20T B5W6 Runice RLA20-2GT-6-C-P5-H16 pulley. For nearby options, compare the standard 20T 5 mm bore / 6 mm width Runice pulley or the black 20T 5 mm bore / 9 mm width Runice pulley.

Gotchas

• This is for 6 mm GT2/2GT belt; do not use it where the build calls for a 9 mm or 10 mm belt pulley.
• It is a drive pulley, not a free-spinning idler.
• Check pulley height and belt path against your specific motion system before ordering replacements for non-Voron machines.

“They fulfill their purpose and the paint seems to be fine.”