HTD-3M 20T-150T Timing Belt Pulleys Pitch 3mm With Keyway CNC Wheel Width 11mm
HTD-3M 20T-150T Timing Belt Pulleys Pitch 3mm With Keyway CNC Wheel Width 11mm
HTD-3M 20T-150T Timing Belt Pulleys Pitch 3mm With Keyway CNC Wheel Width 11mm
HTD-3M 20T-150T Timing Belt Pulleys Pitch 3mm With Keyway CNC Wheel Width 11mm
HTD-3M 20T-150T Timing Belt Pulleys Pitch 3mm With Keyway CNC Wheel Width 11mm
HTD-3M 20T-150T Timing Belt Pulleys Pitch 3mm With Keyway CNC Wheel Width 11mm
HTD-3M 20T-150T Timing Belt Pulleys Pitch 3mm With Keyway CNC Wheel Width 11mm
HTD-3M 20T-150T Timing Belt Pulleys Pitch 3mm With Keyway CNC Wheel Width 11mm
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HTD-3M 20T-150T Timing Belt Pulleys Pitch 3mm With Keyway CNC Wheel Width 11mmHTD-3M 20T-150T Timing Belt Pulleys Pitch 3mm With Keyway CNC Wheel Width 11mmHTD-3M 20T-150T Timing Belt Pulleys Pitch 3mm With Keyway CNC Wheel Width 11mmHTD-3M 20T-150T Timing Belt Pulleys Pitch 3mm With Keyway CNC Wheel Width 11mmHTD-3M 20T-150T Timing Belt Pulleys Pitch 3mm With Keyway CNC Wheel Width 11mmHTD-3M 20T-150T Timing Belt Pulleys Pitch 3mm With Keyway CNC Wheel Width 11mmHTD-3M 20T-150T Timing Belt Pulleys Pitch 3mm With Keyway CNC Wheel Width 11mmHTD-3M 20T-150T Timing Belt Pulleys Pitch 3mm With Keyway CNC Wheel Width 11mm

HTD-3M 20T-150T Timing Belt Pulleys Pitch 3mm With Keyway CNC Wheel Width 11mm

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By HomeDIYer®

Price:
$4.96 USD
Stock:
In stock (500 units), ready to be shipped

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Description

HTD-3M Timing Belt Pulleys — Precise 3mm Pitch Drive for CNC & Automation

When a slipping or misaligned drive wheel derails your CNC router, 3D printer, or robotic axis mid-job, the culprit is often an undersized or poorly toleranced pulley. Engineers, makers, and machine builders who demand repeatable positioning need a timing belt pulley that holds its tooth profile under load — these HTD-3M pulleys are machined to that standard.

Each pulley features an HTD (High Torque Drive) 3mm pitch tooth profile, a uniform 11mm belt-contact width, and a precision-bored hub with a standard keyway. Tooth counts span 20T through 150T, with bore options from 8mm to 25mm and keyway dimensions ranging from 3×1.4mm up to 8×3.3mm depending on the selected variant. The body is machined from aluminum alloy, giving a lightweight yet rigid structure suited to high-cycle applications.

Typical use cases include CNC gantry and axis drives requiring low-backlash synchronous motion, stepper and servo motor output shafts on 3D printers and laser cutters, and custom robotics or conveyor systems where a fixed gear ratio and positive belt engagement are essential. The wide tooth-count range makes it straightforward to dial in the exact drive ratio for your application.

⚙️ Compatible with standard HTD-3M timing belts (3mm pitch, 11mm width). Verify bore diameter and keyway dimensions against your shaft spec before ordering.

✅ Key Features of These HTD-3M Timing Belt Pulleys

  • 🦷 Wide tooth-count range (20T–150T) — covers a broad spectrum of drive ratios for CNC, robotics, and automation builds without needing custom parts.
  • 📐 HTD 3mm pitch tooth profile — the rounded HTD tooth form distributes belt load across a larger contact area, reducing tooth shear stress compared to trapezoidal profiles.
  • 🔩 Precision keyway bore — standard keyway (3×1.4mm to 8×3.3mm depending on variant) locks the pulley to the shaft and prevents rotational slip under torque.
  • 📏 11mm uniform belt width — consistent flange-to-flange width ensures proper belt tracking and simplifies multi-axis alignment on CNC frames.
  • ⚖️ Aluminum alloy construction — lightweight body reduces rotational inertia for faster acceleration on servo and stepper-driven axes while maintaining dimensional stability.
  • 🔄 Multiple bore sizes (8mm–25mm) — select the bore that matches your motor or shaft diameter; keyway dimensions scale with bore size for a secure interference-free fit.

📐 Technical Specifications — HTD-3M Timing Belt Pulley

Belt Pitch 3mm (HTD-3M)
Tooth Profile HTD (High Torque Drive), rounded
Belt Width (Hub Width) 11mm
Number of Teeth 20T – 150T (see variant options)
Bore Diameter 8mm / 10mm / 12mm / 14mm / 15mm / 16mm / 17mm / 18mm / 19mm / 20mm / 25mm (see variant options)
Keyway Dimensions 3×1.4mm / 4×1.8mm / 5×2.3mm / 6×2.8mm / 8×3.3mm (see variant options)
Material Aluminum alloy
Pitch Diameter See variant options
Outside Diameter See variant options
Quantity per Order 1 piece

❓ Frequently Asked Questions

How do I choose the right number of teeth for my application?

The tooth count determines the pitch diameter and, combined with the mating pulley, sets your drive ratio. Divide the desired output speed by the input speed to get the ratio, then select tooth counts that match — for example, a 20T driver paired with a 40T driven pulley gives a 2:1 reduction. Larger tooth counts also increase pitch diameter, which can help reduce belt wrap angle on tight center-distance layouts.

Which bore size should I select for my motor shaft?

Match the bore diameter to your motor or shaft OD. Available bores range from 8mm to 25mm. If your shaft is metric, select the exact matching bore. For imperial shafts, convert to mm and choose the closest available bore — then confirm the keyway dimensions align with your shaft's keyway slot before ordering.

What does the keyway dimension (e.g., 3×1.4mm) mean?

The keyway notation is Width × Depth. A 3×1.4mm keyway means the slot is 3mm wide and 1.4mm deep in the hub. A matching key and shaft keyway of the same dimensions are required to lock the pulley rotationally. Keyway size scales with bore diameter — larger bores use wider, deeper keyways to handle higher torque.

Are these pulleys compatible with any HTD-3M timing belt?

Yes — these pulleys are designed for standard HTD-3M timing belts with a 3mm pitch and up to 11mm width. Ensure your belt width does not exceed 11mm for proper flange engagement. The HTD tooth profile is not interchangeable with trapezoidal (MXL, XL, L) profiles, so confirm your belt is HTD-3M before pairing.

How strong are aluminum timing belt pulleys compared to steel?

Aluminum alloy pulleys offer a favorable strength-to-weight ratio for most CNC, 3D printing, and light-to-medium automation loads. They reduce rotational inertia, which benefits servo and stepper response. For very high torque or abrasive environments, steel pulleys may be preferable — but for the majority of hobbyist and light industrial HTD-3M applications, aluminum alloy is the standard choice.

Do I need to purchase a set screw or key separately?

The pulley hub includes the keyway slot but does not include a key or set screw. You will need to source a standard parallel key matching the keyway dimensions (e.g., a 3×3mm key for a 3×1.4mm keyway slot) separately. Set screws, if required for your assembly, should also be sourced to match the hub's threaded holes — check the hub face for existing threaded ports on your received part.

Can I use these pulleys for a 3D printer or laser cutter axis?

Yes. HTD-3M pulleys are widely used on 3D printer X/Y/Z axes and laser cutter gantries. The 3mm pitch provides fine positioning resolution, and the 11mm belt width is compatible with common 3D printer belt widths. Select a tooth count that matches your existing belt loop length and center distance, and verify the bore matches your stepper motor shaft diameter (commonly 5mm or 8mm — note 8mm is the smallest bore available in this listing).

🛒 Select your Number of Teeth, Bore, and Keyway & Amount above, then add to cart.

 

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