Pulley Type

GT2.5 Timing Pulley (Synchronous Wheel)

Tooth Profile

Rounded tooth profile (specific to GT2.5, less anti-backlash than GT2)

Tooth Pitch

2.5mm (the distance between the centers of two adjacent teeth)

Number of Teeth

20 Teeth

Belt Width Compatibility

Designed for 6mm wide timing belts

Bore Diameter

5mm (inner diameter, for mounting on a 5mm shaft, e.g., NEMA 17 stepper motor)

Outer Diameter (OD)

Approximately 16mm (can vary slightly by manufacturer)

Material

High-Quality Aluminum Alloy (common)

Flanges

Dual flanges (to prevent belt from slipping off)

Shaft Fixing

Typically uses 2 x M3 or M4 grub (set) screws (often included)

Precision

Designed for reasonably accurate power transmission and linear motion

Backlash

While GT2.5 has a rounded tooth profile, it generally has slightly more backlash compared to the newer GT2 profile, which is optimized for minimal backlash in linear motion.

Applications

Older 3D printers, CNC machines, robotics, and other automation projects where precise, non-slipping motion transfer is required. Note: For new designs, GT2 (2mm pitch) is generally preferred for better precision and backlash characteristics.

Durability

Durable and practical due to aluminum construction.

Color

Silver (common for aluminum pulleys)

Weight

Very lightweight, typically a few grams.