GT2 Timing Belt Pulley 10mm Belt Width 20 - 80 Tooth Bore 3-15mm For 3D Printer
GT2 Timing Belt Pulley 10mm Belt Width 20 - 80 Tooth Bore 3-15mm For 3D Printer
GT2 Timing Belt Pulley 10mm Belt Width 20 - 80 Tooth Bore 3-15mm For 3D Printer
GT2 Timing Belt Pulley 10mm Belt Width 20 - 80 Tooth Bore 3-15mm For 3D Printer
GT2 Timing Belt Pulley 10mm Belt Width 20 - 80 Tooth Bore 3-15mm For 3D Printer
GT2 Timing Belt Pulley 10mm Belt Width 20 - 80 Tooth Bore 3-15mm For 3D Printer
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GT2 Timing Belt Pulley 10mm Belt Width 20 - 80 Tooth Bore 3-15mm For 3D PrinterGT2 Timing Belt Pulley 10mm Belt Width 20 - 80 Tooth Bore 3-15mm For 3D PrinterGT2 Timing Belt Pulley 10mm Belt Width 20 - 80 Tooth Bore 3-15mm For 3D PrinterGT2 Timing Belt Pulley 10mm Belt Width 20 - 80 Tooth Bore 3-15mm For 3D PrinterGT2 Timing Belt Pulley 10mm Belt Width 20 - 80 Tooth Bore 3-15mm For 3D PrinterGT2 Timing Belt Pulley 10mm Belt Width 20 - 80 Tooth Bore 3-15mm For 3D Printer

GT2 Timing Belt Pulley 10mm Belt Width 20 - 80 Tooth Bore 3-15mm For 3D Printer

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$4.15 USD
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In stock (500 units), ready to be shipped

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Description

GT2 Timing Belt Pulley — Precise Motion Control for 3D Printers & CNC Machines

When your 3D printer skips steps or your CNC router loses position mid-cut, the culprit is often a worn or mismatched timing pulley. Makers, engineers, and hobbyists who demand repeatable, slip-free motion need a GT2 timing belt pulley that fits exactly right — the first time. This listing covers a wide selection of GT2 timing belt pulleys designed to drop into popular open-frame 3D printers, laser engravers, and light CNC builds without modification.

Each pulley is machined from aluminum alloy with a 2 mm GT2 tooth profile and a 10 mm applicable belt width. Bore sizes range from 3 mm to 15 mm (approximately 0.12 in to 0.59 in), and tooth counts span 20T through 80T to suit a wide range of axis ratios and belt loop lengths. Select variants include a keyway bore (e.g., 8K3, 10K3, 10K4, 12K4, 12.7K5, 14K5, 15K5) for positive shaft engagement in higher-torque applications.

Typical use cases include X/Y/Z axis drives on FDM 3D printers such as Ender, Voron, and CoreXY platforms, stepper-motor drive pulleys for GT2 belt-driven laser engravers, and light-duty CNC router axis pulleys where a GT2 2mm pitch timing pulley with 10mm belt width is the standard specification.

⚙️ Compatibility: Designed for GT2 (2 mm pitch) open or closed timing belts with 10 mm width. Verify your shaft diameter matches the selected bore size before ordering. Keyway variants require a matching keyway on the motor shaft.

✅ Key Features of These GT2 Timing Belt Pulleys

🦷 Wide Tooth Range (20T – 80T)
Twenty tooth-count options let you dial in the exact gear ratio your motion system needs, from fast-travel lightweight axes to slower, higher-torque drives.
🔩 Multiple Bore Sizes (3 – 15 mm)
Standard round bores from 3 mm to 15 mm plus keyway variants (K3, K4, K5) cover NEMA 17, NEMA 23, and common metric motor shafts without adapter sleeves.
📐 GT2 2 mm Pitch Tooth Profile
The GT2 profile delivers low backlash and smooth engagement with standard GT2 belts, maintaining positional accuracy across thousands of print or cut cycles.
🏗️ Aluminum Alloy Construction
Lightweight yet rigid aluminum alloy body keeps rotational inertia low — critical for fast direction changes on CoreXY and delta-style 3D printers.
📏 10 mm Belt Width Standard
Matched to the most common GT2 belt width used in desktop 3D printers and laser engravers, ensuring full tooth engagement across the belt face.
🔑 Keyway Variants for Positive Drive
Select bore options include a machined keyway slot (K3/K4/K5 suffix) for applications where set-screw retention alone is insufficient, such as higher-speed or higher-torque CNC axes.

📐 Technical Specifications — GT2 Timing Belt Pulley

Belt Profile GT2 (2 mm pitch)
Applicable Belt Width 10 mm
Tooth Count Options 20T, 22T, 24T, 25T, 26T, 28T, 30T, 32T, 34T, 35T, 36T, 38T, 40T, 45T, 48T, 50T, 55T, 60T, 70T, 80T
Bore Size Options 3, 4, 5, 6, 6.35, 8, 10, 12, 12.7, 14, 15 mm (round); 8K3, 10K3, 10K4, 12K4, 12.7K5, 14K5, 15K5 (keyway)
Material Aluminum alloy
Flange See variant options
Hub Diameter See variant options
Overall Width See variant options
Set Screw Included (standard round bore variants)
Keyway Available on K3 / K4 / K5 bore variants
Quantity 1 piece per order

❓ Frequently Asked Questions

How do I choose the right tooth count for my 3D printer?

The tooth count determines the belt loop length and the linear distance moved per motor step. Most Cartesian 3D printers (Ender series, etc.) use 20T pulleys on the X and Y axes. CoreXY machines often use 20T as well. If you are replacing an existing pulley, match the tooth count on the worn part. If you are designing a new drive system, calculate the required steps-per-mm based on your motor's step angle, microstepping, and desired resolution.

What bore size should I select for a NEMA 17 stepper motor?

Standard NEMA 17 stepper motors have a 5 mm output shaft diameter. Select bore size 5 mm for a direct fit. Some NEMA 17 motors ship with a 5 mm shaft that has a D-flat — a set screw bore (5 mm round) will still work. If your motor has a keyed shaft, look for a K-suffix variant with the matching keyway width.

What is the difference between a standard bore and a keyway bore (K3, K4, K5)?

Standard round bore variants use one or two set screws to clamp the pulley onto the shaft. Keyway variants (K3, K4, K5) have a machined slot that accepts a matching key on the motor shaft, providing a positive mechanical lock. Keyway bores are recommended for higher-torque or higher-speed applications where set-screw retention alone may slip over time. The number after K indicates the keyway width in mm (e.g., K3 = 3 mm keyway).

Is this pulley compatible with both open-loop and closed-loop GT2 belts?

Yes. The GT2 2 mm pitch tooth profile on these pulleys engages correctly with both open-ended GT2 timing belt stock and pre-formed closed-loop GT2 belts, provided the belt width is 10 mm. Do not use these pulleys with 6 mm wide GT2 belts — the belt will not span the full tooth face and may track off-center.

Will aluminum pulleys wear out faster than steel pulleys?

In typical 3D printing and light CNC applications, aluminum GT2 pulleys offer a very long service life because the belt — not the pulley — is the wear item. Aluminum is also significantly lighter than steel, which reduces rotational inertia and allows faster acceleration on motion axes. For heavy industrial applications with continuous high-load cycling, steel pulleys may be preferable, but for desktop machines aluminum is the standard choice.

How do I verify the pulley fits before installing it?

Before mounting, slide the pulley onto the shaft by hand to confirm the bore is the correct diameter — it should fit snugly without play but without requiring force. Then wrap a short length of your GT2 belt around the pulley teeth and check that the belt seats fully into each tooth groove without lifting. Finally, confirm the belt width (10 mm) matches the pulley flange spacing. If everything aligns, tighten the set screw(s) against the shaft flat (if present) and proceed with installation.

Can I use these pulleys on a laser engraver or CNC router?

Yes. GT2 timing belt pulleys with 10 mm belt width are widely used on desktop laser engravers (xTool, Sculpfun, Ortur, etc.) and light CNC routers that use GT2 belt drives. Select the tooth count that matches your existing drive system, and choose a bore size that fits your stepper or servo motor shaft. For CNC applications with higher cutting forces, consider keyway bore variants for more secure shaft engagement.

🛒 Select your Tooth count and Bore(mm) above, then add to cart.

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