GT2 6mm/10mm Timing Belt Smooth/Toothed Tooth Idler Drive Pulley 12-60 Bore 3-15

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GT2 6mm/10mm Timing Belt Smooth/Toothed Tooth Idler Drive Pulley 12-60 Bore 3-15

HomeDIYer

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By HomeDIYer®

Type:: Toothed Type

Number of teeth:: 20

Applicable belt width. & Bore diameter:: 6mm & 3mm

Price:

$4.07 USD

Stock:

In stock (500 units), ready to be shipped

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GT2 Timing Belt Pulley — Precision Idler & Drive Wheels for 6mm and 10mm Belts

When a slipping or misaligned pulley derails your 3D printer mid-print or throws off your CNC axis, the root cause is almost always a poorly dimensioned bore or an incompatible tooth profile. Engineers, makers, and automation builders who demand repeatable motion control need a GT2 timing belt pulley that fits exactly — right tooth count, right bore, right belt width — without compromise.

These GT2 pulleys are machined from aluminum alloy with a black anodized finish. They are available in two belt-width configurations — 6 mm (approx. 0.24 in) and 10 mm (approx. 0.39 in) — and in both toothed drive and smooth idler profiles. Tooth counts range from 12 T to 60 T, and bore diameters span 3 mm to 15 mm (approx. 0.12–0.59 in), covering the most common shaft sizes used in desktop motion systems.

Typical applications include GT2 belt-driven 3D printer axes (X/Y gantry tensioning and drive), CNC router and laser engraver belt drives, robotics joint actuators requiring low-backlash synchronous motion, and DIY linear motion stages where smooth idler pulleys redirect belt paths without introducing tooth engagement noise.

✅ Compatible with standard 2 mm pitch GT2 open-loop and closed-loop timing belts in 6 mm and 10 mm widths.

✅ Key Features of These GT2 Timing Belt Pulleys

⚙️ Dual Profile Selection — Choose Toothed Type for positive drive engagement or Smooth Type for frictionless belt redirection as an idler, eliminating tooth-mesh noise in tensioner positions.
📐 Wide Tooth Count Range — Available from 12 T to 60 T, allowing precise gear-ratio tuning for stepper-driven axes, extruder drives, and multi-stage belt systems.
🔩 Flexible Bore Sizing — Bore diameters from 3 mm to 15 mm accommodate NEMA 17 motor shafts (5 mm), NEMA 23 shafts (6.35 mm), and custom shaft diameters used in robotics and automation.
📏 Dual Belt Width Support — Offered in 6 mm and 10 mm belt-width variants; the 10 mm series handles higher belt tension loads typical of larger-format CNC and laser systems.
🛡️ Anodized Aluminum Construction — Lightweight aluminum body with anodized surface treatment resists wear and corrosion across extended duty cycles without adding significant rotating mass.
🔄 Drop-In Motion System Compatibility — 2 mm GT2 pitch matches the industry-standard tooth profile used across Voron, Ender, RatRig, and most open-source 3D printer and CNC platforms.

📐 Technical Specifications — GT2 Timing Belt Pulleys

Belt Pitch	GT2 — 2 mm
Belt Width Options	6 mm / 10 mm
Tooth Count Range	12 T – 60 T
Bore Diameter Range	3 mm – 15 mm
Profile Types	Toothed (drive) / Smooth (idler)
Material	Aluminum alloy
Surface Finish	Black anodized
Flange	See variant options
Set Screw	See variant options
Weight	See variant options

❓ Frequently Asked Questions

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

Tooth count determines the pulley's pitch diameter and, combined with your motor's step angle and microstepping, sets the linear resolution of your axis. For most desktop 3D printers, 20 T is the standard drive pulley. Larger tooth counts (40 T–60 T) are used when you need a higher belt speed or a mechanical advantage reduction in the drive train. Match the tooth count to your existing belt loop length and axis geometry.

What is the difference between the Toothed Type and Smooth Type?

The Toothed Type engages directly with the belt's tooth profile to transmit torque — used on motor shafts and driven shafts. The Smooth Type has a flat rim with no teeth; it acts as an idler or tensioner that redirects the belt path without engaging the teeth, which reduces noise and wear at non-drive positions.

Which bore diameter should I select for a NEMA 17 stepper motor?

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 NEMA 23 motors, the shaft is typically 6.35 mm — select the 6 mm bore and verify fit, or choose the 7 mm bore if a looser fit with a set screw is acceptable.

Are these pulleys compatible with standard GT2 open-loop belts?

Yes. These pulleys use the standard 2 mm GT2 tooth profile, which is compatible with all GT2 open-loop and closed-loop timing belts in the matching width (6 mm or 10 mm). They are interchangeable with pulleys used on Voron, Ender 3, RatRig, and similar platforms that specify GT2 2 mm pitch components.

Can I use a 6 mm belt pulley with a 10 mm belt, or vice versa?

No. The belt width must match the pulley's groove width. Using a 10 mm belt on a 6 mm pulley will cause the belt to overhang the flanges and track incorrectly, leading to premature wear or belt derailment. Always match belt width to pulley groove width exactly.

How do I secure the pulley to the shaft?

These pulleys are secured via one or more set screws threaded into the hub. Insert the shaft to the correct depth, align any D-flat or keyway if present, then tighten the set screw(s) with the appropriate hex key. For high-torque applications, applying a small amount of thread-locking compound to the set screw is recommended to prevent loosening under vibration.

What material are these pulleys made from, and will they corrode?

The pulleys are machined from aluminum alloy and finished with a black anodized coating. Anodizing creates a hard oxide layer that significantly improves corrosion resistance and surface hardness compared to bare aluminum. They are suitable for indoor motion systems and light-duty environments. Avoid prolonged exposure to strong acids or salt spray.

🛒 Select your tooth count, belt width, and bore diameter above, then add to cart.