HTD3M Timing Pulley 72-120 Teeth Synchronous Wheel 10mm Belt Width 4mm-25mm Bore
HTD3M Timing Pulley 72-120 Teeth Synchronous Wheel 10mm Belt Width 4mm-25mm Bore
HTD3M Timing Pulley 72-120 Teeth Synchronous Wheel 10mm Belt Width 4mm-25mm Bore
HTD3M Timing Pulley 72-120 Teeth Synchronous Wheel 10mm Belt Width 4mm-25mm Bore
HTD3M Timing Pulley 72-120 Teeth Synchronous Wheel 10mm Belt Width 4mm-25mm Bore
HTD3M Timing Pulley 72-120 Teeth Synchronous Wheel 10mm Belt Width 4mm-25mm Bore
HTD3M Timing Pulley 72-120 Teeth Synchronous Wheel 10mm Belt Width 4mm-25mm Bore
HTD3M Timing Pulley 72-120 Teeth Synchronous Wheel 10mm Belt Width 4mm-25mm Bore
HTD3M Timing Pulley 72-120 Teeth Synchronous Wheel 10mm Belt Width 4mm-25mm Bore
HTD3M Timing Pulley 72-120 Teeth Synchronous Wheel 10mm Belt Width 4mm-25mm Bore
HTD3M Timing Pulley 72-120 Teeth Synchronous Wheel 10mm Belt Width 4mm-25mm Bore
HTD3M Timing Pulley 72-120 Teeth Synchronous Wheel 10mm Belt Width 4mm-25mm Bore
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HTD3M Timing Pulley 72-120 Teeth Synchronous Wheel 10mm Belt Width 4mm-25mm BoreHTD3M Timing Pulley 72-120 Teeth Synchronous Wheel 10mm Belt Width 4mm-25mm BoreHTD3M Timing Pulley 72-120 Teeth Synchronous Wheel 10mm Belt Width 4mm-25mm BoreHTD3M Timing Pulley 72-120 Teeth Synchronous Wheel 10mm Belt Width 4mm-25mm BoreHTD3M Timing Pulley 72-120 Teeth Synchronous Wheel 10mm Belt Width 4mm-25mm BoreHTD3M Timing Pulley 72-120 Teeth Synchronous Wheel 10mm Belt Width 4mm-25mm BoreHTD3M Timing Pulley 72-120 Teeth Synchronous Wheel 10mm Belt Width 4mm-25mm BoreHTD3M Timing Pulley 72-120 Teeth Synchronous Wheel 10mm Belt Width 4mm-25mm BoreHTD3M Timing Pulley 72-120 Teeth Synchronous Wheel 10mm Belt Width 4mm-25mm BoreHTD3M Timing Pulley 72-120 Teeth Synchronous Wheel 10mm Belt Width 4mm-25mm BoreHTD3M Timing Pulley 72-120 Teeth Synchronous Wheel 10mm Belt Width 4mm-25mm BoreHTD3M Timing Pulley 72-120 Teeth Synchronous Wheel 10mm Belt Width 4mm-25mm Bore

HTD3M Timing Pulley 72-120 Teeth Synchronous Wheel 10mm Belt Width 4mm-25mm Bore

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Price:
$35.89 USD
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In stock (500 units), ready to be shipped

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Description

HTD3M Timing Pulley 72–120 Teeth — Precise Synchronous Drive for Makers and Engineers

When your CNC router skips steps or your 3D printer loses position mid-print, the culprit is often a mismatched or worn timing pulley. These HTD3M timing pulleys are engineered for makers, robotics builders, and automation engineers who need repeatable, slip-free motion transfer without the guesswork of sourcing the right bore size.

Each HTD3M timing pulley is machined from aluminum alloy and features an HTD (High Torque Drive) 3M tooth profile — 3mm pitch, 10mm belt width. Available in 72, 75, 76, 80, 90, 100, 110, and 120 tooth counts, with bore sizes ranging from 5mm to 25mm (approx. 0.20" to 0.98"), including plain bore and keyed bore options (keyway widths 3–8mm depending on bore).

Typical use cases include CNC router X/Y axis drives, 3D printer extruder and motion systems, robotic arm joint actuators, and light-duty conveyor or indexing mechanisms requiring precise angular positioning.

⚙️ Compatibility: Fits standard HTD 3M timing belts with 10mm width. Verify your shaft diameter and keyway requirement before ordering.

✅ Key Features of These HTD3M Timing Pulleys

  • 🔩Wide Tooth Range: Available in 72, 75, 76, 80, 90, 100, 110, and 120 teeth — covering a broad gear ratio spectrum for speed reduction or torque multiplication in your drive system.
  • 📐HTD 3M Tooth Profile: The curved HTD tooth form distributes load across a larger contact area than trapezoidal profiles, reducing tooth stress and improving torque capacity at the same belt tension.
  • 🔧Multiple Bore Options: Plain bore (5–25mm) and keyed bore variants (e.g., 10mm bore with 3mm or 4mm keyway) allow direct shaft mounting with or without a set screw, accommodating a wide range of motor and shaft standards.
  • 🏗️Aluminum Alloy Construction: Lightweight yet rigid aluminum body keeps rotational inertia low — important for high-acceleration servo and stepper motor applications where response time matters.
  • 📏10mm Belt Width: Standardized 10mm belt width ensures compatibility with off-the-shelf HTD 3M belts, simplifying replacement and system design without custom sourcing.
  • 🔄Consistent Pitch Accuracy: Machined tooth spacing maintains consistent 3mm pitch around the full circumference, ensuring smooth, low-vibration operation in position-critical applications like CNC and 3D printing.

📐 Technical Specifications — HTD3M Timing Pulley

Belt Type HTD 3M (3mm pitch, curved tooth)
Belt Width 10mm
Teeth Number 72 / 75 / 76 / 80 / 90 / 100 / 110 / 120
Bore Size 5 / 6 / 8 / 10 / 12 / 14 / 15 / 17 / 19 / 20 / 25mm (plain); keyed bore options available — see variant options
Keyway Width 3mm, 4mm, 5mm, 6mm, or 8mm depending on bore — see variant options
Material Aluminum alloy
Pitch Diameter (approx.) See variant options
Outer Diameter (approx.) See variant options
Hub Length See variant options
Flange See variant options
Finish Natural anodized / machined aluminum
Weight See variant options

❓ 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 your motor pulley tooth count, sets your drive ratio. More teeth = larger diameter = lower RPM at the output shaft for the same input speed. For CNC and 3D printers, match the tooth count to your existing belt loop length and desired steps-per-mm calculation. If you are replacing an existing pulley, match the tooth count exactly.

What is the difference between plain bore and keyed bore variants?

Plain bore pulleys have a smooth cylindrical hole and are typically secured to the shaft using a set screw (grub screw) tightened against the shaft surface. Keyed bore pulleys have a machined slot (keyway) that accepts a matching key inserted into the shaft, providing a positive mechanical lock that prevents rotational slipping under higher torque loads. Choose keyed bore for high-torque or reversing-load applications.

Will this pulley fit my HTD 3M timing belt?

Yes — these pulleys are designed for standard HTD 3M belts with 10mm width. Confirm your belt is labeled "HTD 3M" (3mm pitch, curved tooth profile) and is 10mm wide. Do not use with MXL, T2.5, T5, or GT2 belts, as the tooth profiles are not interchangeable.

How do I measure my shaft to select the correct bore size?

Use a digital caliper to measure the outer diameter of your motor or drive shaft at the mounting point. Select the bore size that matches your shaft diameter exactly — a bore that is too large will cause runout and vibration. If your shaft has a flat (D-cut) or keyway, select the corresponding keyed bore variant and ensure the keyway width matches your shaft key.

Are these pulleys suitable for high-speed or high-torque applications?

These aluminum HTD3M pulleys are well-suited for light-to-medium duty applications such as CNC routers, 3D printers, and small robotics. The HTD tooth profile handles moderate torque better than trapezoidal profiles. For very high torque or continuous industrial duty cycles, consider steel pulleys or consult the torque rating of your specific belt and pulley combination. Keyed bore variants are recommended for higher torque scenarios.

Can I use these pulleys with a stepper motor shaft?

Yes. These pulleys are commonly used with NEMA 17 and NEMA 23 stepper motors. NEMA 17 motors typically have a 5mm shaft (select Bore 5mm), while NEMA 23 motors commonly use 6.35mm or 8mm shafts (select Bore 6mm or Bore 8mm). Always verify your specific motor's shaft diameter before ordering.

What is the pitch diameter for each tooth count?

Pitch diameter is calculated as: PD = (Teeth × Pitch) ÷ π. For HTD 3M with 3mm pitch: 72T ≈ 68.75mm, 75T ≈ 71.62mm, 80T ≈ 76.39mm, 90T ≈ 85.94mm, 100T ≈ 95.49mm, 110T ≈ 105.04mm, 120T ≈ 114.59mm. These are reference values; actual outer diameter will be slightly larger due to tooth addendum.

🛒 Select your Teeth Number and Bore Size above, then add to cart.

 

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