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When a slipping or misaligned drive pulley derails your build — whether mid-print on a CoreXY machine or mid-cut on a CNC router — the root cause is almost always a pulley that wasn't spec'd correctly from the start. Engineers, makers, and motion-system integrators who demand repeatable, zero-slip positioning need a 2GT synchronous wheel they can trust across a wide range of shaft sizes and tooth counts.
These 2GT timing belt pulleys are machined from aluminum alloy and are available in two flange configurations: BF-type (with dual flanges to retain the belt laterally) and K-type (flangeless, for applications where the belt is guided by the frame or tensioner). Tooth counts span 16T to 48T, and bore diameters range from 4 mm (≈ 0.157 in) to 14 mm (≈ 0.551 in), with slot widths of either 7 mm or 11 mm to accommodate standard 2GT belt widths.
Typical use cases include CoreXY and Cartesian 3D printer X/Y axis drives, belt-driven CNC router gantries, delta robot arm synchronization, and lightweight conveyor or pick-and-place automation. Long-tail applications such as "2GT pulley for NEMA 17 stepper" (5 mm bore) or "2GT 20T pulley for Ender 3" (5 mm bore, 20T) are directly covered by the available variant matrix.
| Belt Standard | 2GT (GT2), 2 mm pitch |
|---|---|
| Tooth Count Options | 16T, 20T, 24T, 25T, 26T, 28T, 30T, 32T, 35T, 36T, 38T, 40T, 42T, 45T, 48T |
| Bore Diameter Options | 4 / 5 / 6 / 6.35 / 7 / 8 / 10 / 12 / 12.7 / 14 mm |
| Slot Width Options | 7 mm (fits GT2-6mm belt) / 11 mm (fits GT2-10mm belt) |
| Flange Type | BF-type (dual flange) / K-type (flangeless) |
| Material | Aluminum alloy |
| Bore Retention | Set-screw |
| Outer Diameter | See variant options |
| Hub Length | See variant options |
| Surface Finish | See variant options |
Choose BF-type if your belt has no external lateral guide — the dual flanges keep the belt centered on the pulley. Choose K-type (flangeless) when your machine frame, linear rail, or tensioner already constrains the belt laterally, or when you need to slide the belt on axially during assembly.
Standard NEMA 17 stepper motors have a 5 mm output shaft. Select the 5 mm bore variant. If your motor has a D-cut shaft, ensure the set-screw aligns with the flat for a secure grip.
Slot width corresponds to belt width: 7 mm slot is for GT2-6mm (6 mm wide) belts, which are standard on most desktop 3D printers. 11 mm slot is for GT2-10mm (10 mm wide) belts, used in higher-torque or wider-span CNC and robotics applications.
Yes. The 2GT tooth profile is dimensionally equivalent to the Gates GT2 profile (2 mm pitch, same tooth geometry). These pulleys are compatible with standard GT2 open-loop and closed-loop belts from any manufacturer.
A 1:1 ratio requires identical tooth counts on both the drive and driven pulleys — for example, two 20T pulleys. To increase torque (reduce speed), use a smaller tooth count on the motor pulley and a larger count on the driven pulley, such as 16T driving 32T for a 2:1 reduction.
Each pulley uses a set-screw for shaft retention. Tighten the set-screw against the shaft (or the D-flat if present) using the appropriate hex key. For high-torque applications, apply a small amount of thread-locking compound to the set-screw threads to prevent loosening under vibration.
Yes. 6.35 mm is the metric equivalent of 1/4 inch (0.250 in), so the 6.35 mm bore variant is the correct choice for standard imperial quarter-inch motor or gearbox shafts.
A 16T pulley gives finer theoretical resolution per motor step (smaller belt advance per tooth), while a 20T pulley is the most common choice for Cartesian and CoreXY printers, balancing speed and resolution. Most Ender-series and Voron-style printers use 20T pulleys on NEMA 17 motors with 5 mm bores.
