GT2 Zahnrad Pulley 16-80 Zahn-Riemenscheibe-Zahnriemenrad - CNC-3D Drucker

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GT2 Zahnrad Pulley 16-80 Zahn-Riemenscheibe-Zahnriemenrad - CNC-3D Drucker

HomeDIYer

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By HomeDIYer®

Number of teeth:: 80T

Inner hole:: 5mm

Packing Qty:: 1pcs

Price:

$9.26 USD

Stock:

In stock (500 units), ready to be shipped

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GT2 Timing Pulley — Precision Belt Drive for CNC and 3D Printer Builds

When a slipping or mismatched pulley throws off your axis calibration mid-print or derails a CNC pass, the entire project pays the price. Engineers, makers, and automation builders who demand repeatable, backlash-free motion need a GT2 timing pulley they can rely on across every cycle. These GT2 Zahnriemenrad pulleys are engineered for exactly that — consistent tooth engagement and smooth belt tracking in demanding drive systems.

Each pulley features a GT2 tooth profile machined to mesh precisely with standard 2mm-pitch GT2 timing belts. Available in tooth counts from 16T to 80T and bore diameters from 3.17mm (1/8 in) to 14mm, the pulleys are typically 6–16mm wide with an outer diameter ranging from approximately 10mm to 52mm depending on tooth count. The bore accepts a set-screw for secure shaft fixing without additional machining.

Typical use cases include CoreXY and Cartesian 3D printer X/Y axis drives, CNC router gantry belt systems, and lightweight robotic arm joint actuators — all applications where a GT2 belt pulley with a precise bore-to-shaft fit directly determines positioning accuracy and repeatability.

⚙️ Compatible with standard GT2 2mm-pitch timing belts (6mm width). Verify bore diameter matches your motor or idler shaft before ordering.

✅ Key Features of These GT2 Timing Pulleys

🦷

Wide Tooth Count Range

Available from 16T to 80T, covering low-speed high-torque drives and high-speed lightweight motion systems in a single product line.

🔩

Multiple Bore Options

Inner hole sizes from 3.17mm to 14mm accommodate NEMA stepper motor shafts, hobby servo shafts, and custom CNC spindle diameters without adapters.

📐

GT2 2mm Pitch Profile

Tooth geometry matches the GT2 standard for zero-backlash meshing with GT2 belts, ensuring accurate linear positioning in open-loop and closed-loop systems.

🔧

Set-Screw Shaft Fixing

Each pulley includes a set-screw bore for tool-free shaft locking, simplifying installation and allowing quick swaps during prototyping or maintenance.

⚖️

Lightweight Construction

Compact form factor keeps moving mass low — critical for high-acceleration 3D printer carriages and CNC gantries where inertia directly affects print speed and cut quality.

🔄

Broad System Compatibility

Fits CoreXY, Cartesian, delta, and H-bot printer architectures as well as standard CNC belt-drive gantries and light-duty robotic actuators using GT2 belt systems.

📐 Technical Specifications — GT2 Timing Pulley

Belt Pitch	GT2 — 2mm
Tooth Count Options	16T, 20T, 48T, 60T, 80T
Bore Diameter Options	3.17mm, 4mm, 5mm, 6mm, 6.35mm, 8mm, 10mm, 12mm, 14mm
Belt Width Compatibility	6mm (GT2 standard)
Outer Diameter (approx.)	See variant options
Pulley Width	See variant options
Shaft Fixing	Set-screw
Material	See variant options
Finish	See variant options
Flange	See variant options
Packing Quantity	1 pc per unit

❓ Frequently Asked Questions

How do I choose the right tooth count for my build?

Tooth count determines the pulley's pitch diameter and, combined with your motor's step angle and microstepping setting, defines your system's steps-per-mm. Smaller tooth counts (16T–20T) give finer resolution and suit compact, high-speed carriages. Larger counts (60T–80T) increase belt wrap and torque output, making them better for heavier gantries or slower, higher-force drives. Match your tooth count to your target steps-per-mm calculation before ordering.

Which bore size fits a standard NEMA 17 stepper motor shaft?

Standard NEMA 17 stepper motors have a 5mm output shaft. Select the 5mm bore variant for a direct fit. If your motor has a D-cut shaft, ensure the set-screw is positioned to engage the flat for a secure, non-slip connection.

Are these pulleys compatible with GT2 belts from other brands?

Yes. The GT2 2mm pitch profile is an open standard. These pulleys mesh with any GT2 timing belt of the correct pitch and width (6mm). Belt brand does not affect compatibility as long as the pitch and width match.

What is the difference between the 6mm and 6.35mm bore options?

6.35mm is the metric equivalent of 1/4 inch, a common shaft size in North American hobby motors and some servo systems. If your shaft is imperial (1/4 in), choose 6.35mm. For metric 6mm shafts, choose the 6mm bore. Using the wrong bore will result in a loose fit or inability to mount the pulley.

How strong is the set-screw connection — will it slip under load?

The set-screw provides adequate holding force for typical 3D printer and light CNC loads when properly tightened with the correct hex key. For high-torque or high-vibration applications, applying a small amount of thread-locking compound to the set-screw is recommended. Ensure the screw seats against the shaft flat (D-cut) if present for maximum grip.

Can I use these pulleys as idlers by removing the set-screw?

These are drive pulleys designed to be fixed to a motor shaft. They are not optimized for idler use, which typically requires a smooth bore and a bearing insert. For idler positions, a dedicated idler pulley with an integrated bearing is recommended to avoid bore wear and ensure smooth belt tracking.

What tooth counts are available and how do I decide between 48T, 60T, and 80T?

48T, 60T, and 80T are larger pulleys suited for applications where you need a higher gear ratio, more belt contact, or a larger pitch diameter. 48T is a good middle ground for medium-speed CNC belt drives. 60T and 80T are used in systems where the motor drives a large axis directly and lower RPM with higher torque is preferred, or where a specific steps-per-mm value requires a larger pulley diameter.

🛒 Select your tooth count and inner hole diameter above, then add to cart.