GT2 6mm Timing Belt Tooth Idler Drive Pulley 16T 20T 30T 36T 40T Bore:3mm-10mm

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GT2 6mm Timing Belt Tooth Idler Drive Pulley 16T 20T 30T 36T 40T Bore:3mm-10mm

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By HomeDIYer®

Size: GT2-T30

Bore Diameter: 5mm

Applicable Belt Width & Amount(pcs): 6 mm & 1

Price:

$3.36 USD

Stock:

In stock (500 units), ready to be shipped

Quantity:

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GT2 6mm Timing Belt Pulley — Precise Motion Control for Robotics, CNC & 3D Printers

When your motion system demands repeatable, zero-slip power transmission, a mismatched or worn pulley becomes the weakest link. Engineers, makers, and automation builders working on 3D printers, CNC routers, laser cutters, and robotic actuators need a GT2 timing belt pulley that holds tight tolerances across thousands of cycles without play or wobble.

These GT2 6mm timing belt pulleys are machined from aluminum alloy with a smooth anodized finish. Available in tooth counts from T16 to T60 — including T16, T20, T30, T36, T40, and T60 — and bore diameters ranging from 3.17 mm (~0.125 in) to 12 mm (~0.472 in). Hub heights span approximately 14–16 mm depending on the selected variant. All pulleys are designed for standard 6 mm wide GT2 open-loop or closed-loop belts with a 2 mm pitch.

Typical use cases include GT2 pulley replacement for Ender 3 / Voron / CoreXY 3D printer X/Y axis drives, CNC router belt-drive axis upgrades requiring GT2 idler pulley with bore, and lightweight robotic joint drive systems where a GT2 drive pulley with set screw secures the shaft reliably.

⚙️ Compatible with standard GT2 2mm pitch, 6mm wide timing belts. Verify bore diameter and tooth count match your drive shaft and belt loop before ordering.

✅ Key Features of These GT2 Timing Belt Pulleys

🔩 Wide Tooth Count Selection
Choose from T16, T20, T30, T36, T40, and T60 — covering low-speed high-torque and high-speed low-torque drive ratios in a single product listing.
🎯 Precision-Machined GT2 Profile
The 2 mm pitch GT2 tooth profile meshes cleanly with GT2 belts, minimizing backlash and maintaining positional accuracy in closed-loop and open-loop motion systems.
⚖️ Aluminum Alloy Construction
Lightweight yet rigid aluminum alloy body keeps rotational inertia low — critical for fast-reversing axes on 3D printers and CNC machines.
📐 Multiple Bore Diameters
Bore options from 3.17 mm to 12 mm accommodate NEMA 17 motor shafts (5 mm), common metric shafts, and fractional inch shafts (6.35 mm / ¼"). Set screw included on drive variants.
🔄 Idler & Drive Variants Available
Select smooth-bore idler pulleys (M3/M4 cogging variants) for belt tensioning, or keyed/set-screw drive pulleys for direct shaft mounting — both in the same listing.
📦 Flexible Pack Quantities
Available in packs of 1, 2, or 5 pieces per order — ideal for single-axis builds, dual-axis machines, or stocking spare parts for ongoing projects.

📐 Technical Specifications — GT2 Timing Belt Pulleys

Belt Pitch	GT2 — 2 mm
Belt Width Compatibility	6 mm
Tooth Count Options	T16, T20, T30, T36, T40, T60
Bore Diameter Options	3.17 mm, 4 mm, 5 mm, 6 mm, 6.35 mm, 7 mm, 8 mm, 10 mm, 12 mm
Hub Height	14 mm or 16 mm (see variant options)
Material	Aluminum alloy
Finish	Anodized
Fastening	Set screw (drive variants); smooth bore (idler variants)
Pack Quantity	1 pc, 2 pcs, or 5 pcs (see variant options)
Outer Diameter	See variant options
Weight (per piece)	See variant options

❓ Frequently Asked Questions

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

Tooth count determines your drive ratio and belt speed. Smaller pulleys (T16, T20) produce more torque at lower belt speeds — common on 3D printer extruder drives. Larger pulleys (T36, T40, T60) increase belt speed per motor revolution, useful for fast-travel axes. Match the tooth count to your existing belt loop length and the driven pulley on the other end of your system.

Which bore diameter fits a NEMA 17 stepper motor shaft?

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

What is the difference between the idler (cogging) and drive pulley variants?

Drive pulleys have a set screw and are designed to mount directly on a motor or drive shaft to transmit torque to the belt. Idler pulleys (labeled M3 Cogging or M4 Cogging) have a smooth or threaded bore intended to spin freely on a bolt or standoff, used to tension or redirect the belt without driving it.

Are these pulleys compatible with GT2 closed-loop belts?

Yes. The GT2 2 mm pitch tooth profile is identical whether you use open-loop (cut-to-length) or closed-loop (loop belt) GT2 belts, as long as the belt width is 6 mm. Verify the inner circumference of your closed-loop belt matches the center-to-center distance of your pulley pair.

How strong are aluminum GT2 pulleys compared to plastic ones?

Aluminum alloy pulleys offer significantly higher rigidity and dimensional stability than injection-molded plastic pulleys. They resist deformation under belt tension, maintain tooth profile accuracy over time, and handle higher operating temperatures — making them the preferred choice for CNC routers, laser cutters, and any application with sustained belt loads.

Do these pulleys resist corrosion in humid or outdoor environments?

The anodized aluminum finish provides a layer of corrosion resistance suitable for typical indoor workshop and light industrial environments. For prolonged outdoor or high-humidity exposure, consider applying a light machine oil to the bore and set screw area to prevent oxidation on uncoated contact surfaces.

Can I order multiple quantities for a dual-axis or multi-axis machine?

Yes. Each variant is available in packs of 1, 2, or 5 pieces. For a CoreXY or H-bot 3D printer requiring two identical drive pulleys, select the "6 mm & 2" quantity option. For stocking spares or building multiple machines, the "6 mm & 5" pack offers the best per-unit value.

🛒 Select your Size, Bore Diameter, and Quantity above, then add to cart.