HTD-3M 12T - 20T Timing Belt Pulley Pitch 3mm With Step Drive Pulleys Width 11mm
HTD-3M 12T - 20T Timing Belt Pulley Pitch 3mm With Step Drive Pulleys Width 11mm
HTD-3M 12T - 20T Timing Belt Pulley Pitch 3mm With Step Drive Pulleys Width 11mm
HTD-3M 12T - 20T Timing Belt Pulley Pitch 3mm With Step Drive Pulleys Width 11mm
HTD-3M 12T - 20T Timing Belt Pulley Pitch 3mm With Step Drive Pulleys Width 11mm
HTD-3M 12T - 20T Timing Belt Pulley Pitch 3mm With Step Drive Pulleys Width 11mm
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HTD-3M 12T - 20T Timing Belt Pulley Pitch 3mm With Step Drive Pulleys Width 11mmHTD-3M 12T - 20T Timing Belt Pulley Pitch 3mm With Step Drive Pulleys Width 11mmHTD-3M 12T - 20T Timing Belt Pulley Pitch 3mm With Step Drive Pulleys Width 11mmHTD-3M 12T - 20T Timing Belt Pulley Pitch 3mm With Step Drive Pulleys Width 11mmHTD-3M 12T - 20T Timing Belt Pulley Pitch 3mm With Step Drive Pulleys Width 11mmHTD-3M 12T - 20T Timing Belt Pulley Pitch 3mm With Step Drive Pulleys Width 11mm

HTD-3M 12T - 20T Timing Belt Pulley Pitch 3mm With Step Drive Pulleys Width 11mm

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Price:
$6.11 USD
Stock:
In stock (500 units), ready to be shipped

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Description

HTD-3M Timing Belt Pulley — Precise 3mm Pitch Step Drive for Makers & Engineers

When belt slip or misalignment is costing you accuracy on your build, the right pulley makes all the difference. Whether you're a CNC hobbyist, robotics builder, or small-shop engineer, these HTD-3M step drive timing belt pulleys give you the repeatable, slip-free motion control your project demands.

Each pulley is machined from aluminum alloy with a natural anodized finish, featuring an HTD (High Torque Drive) 3mm pitch tooth profile and a fixed belt width of 11mm (0.43 in). Tooth counts range from 12T to 20T, with bore options spanning 3mm to 14mm (0.12–0.55 in) to suit a wide range of shaft sizes. A set-screw hub secures the pulley firmly to the shaft.

These pulleys are well-suited for 3D printer X/Y axis drives using HTD-3M belts, CNC router and laser cutter motion systems requiring precise step-per-mm calibration, and lightweight robotics or automation rigs where low backlash timing drive pulleys are essential.

⚙️ Compatibility: Designed for use with HTD-3M (3mm pitch) timing belts, 11mm belt width. Verify bore diameter matches your motor or drive shaft before ordering.

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

🦷 12T to 20T Tooth Range
Seven tooth-count options (12, 14, 15, 16, 17, 18, 20 teeth) let you dial in the exact gear ratio and belt speed for your drive system.
📐 3mm HTD Pitch Profile
The HTD tooth form provides a larger contact area than trapezoidal profiles, reducing tooth load and improving torque transmission without belt skip.
🔩 Wide Bore Selection (3–14mm)
Available in 3, 4, 5, 6, 6.35, 8, 10, 12, 12.7, and 14mm bores — covering standard metric shafts and common imperial sizes like 1/4" (6.35mm) and 1/2" (12.7mm).
🏗️ Step Drive (Flanged) Design
Integrated flanges on both sides of the belt groove keep the belt tracking true, preventing lateral drift during high-speed or high-load operation.
⚖️ Lightweight Aluminum Construction
Machined aluminum alloy body keeps rotating mass low, reducing inertia for faster acceleration and deceleration in motion-control applications.
🔧 Set-Screw Hub Retention
Each pulley includes a set-screw bore for secure shaft mounting. Tighten against a flat on the shaft for maximum holding force and easy repositioning.

📐 Technical Specifications — HTD-3M Timing Belt Pulley

Belt Pitch 3mm (HTD-3M)
Belt Width 11mm (0.43 in)
Tooth Count Options 12T, 14T, 15T, 16T, 17T, 18T, 20T
Bore Diameter Options 3, 4, 5, 6, 6.35, 8, 10, 12, 12.7, 14mm
Material Aluminum alloy
Finish Natural anodized
Hub Retention Set-screw
Outer Diameter See variant options
Flange Type Step drive (double-flanged)
Compatible Belt HTD-3M, 11mm width
Quantity 1 piece per order (multi-pack options available)

❓ Frequently Asked Questions

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

Tooth count determines your drive ratio and belt speed. A smaller pulley (e.g., 12T) on the motor paired with a larger pulley on the driven shaft reduces speed and increases torque. For 3D printers, 16T–20T on the motor is common for a good balance of speed and resolution. Match both pulleys to the same pitch (HTD-3M) for correct meshing.

Which bore size should I select for my stepper motor shaft?

Most NEMA 17 stepper motors use a 5mm shaft; NEMA 23 motors typically use an 8mm shaft. For servo motors or custom shafts, measure the shaft diameter with calipers before ordering. Common imperial sizes are also covered: 6.35mm = 1/4", 12.7mm = 1/2".

Are these pulleys compatible with standard HTD-3M timing belts?

Yes. These pulleys are designed specifically for HTD-3M (3mm pitch) timing belts with an 11mm belt width. Ensure your belt is also 11mm wide for proper flange clearance. Do not use with GT2 or MXL belts — the tooth profiles are not interchangeable.

How strong is the set-screw connection? Will the pulley slip under load?

The set-screw provides solid retention for typical maker and light industrial loads. For maximum holding strength, align the set-screw with a flat ground on the motor shaft. In high-torque applications, consider using thread-locking compound on the set-screw. The aluminum body is rigid and does not flex under normal belt tension.

Will these pulleys corrode or degrade over time?

The anodized aluminum finish provides good resistance to oxidation and light corrosion in typical indoor environments. These pulleys are not rated for continuous immersion or highly corrosive atmospheres. For outdoor or humid environments, periodic inspection is recommended.

Can I use these pulleys in a 3D printer or CNC router?

Yes — these are a popular choice for both applications. For 3D printers using HTD-3M belt drives (common on CoreXY and Cartesian designs), select the tooth count that matches your existing idler/motor pulley setup. For CNC routers, verify the bore matches your spindle or motor shaft and that the 11mm belt width fits your belt path.

What is the difference between HTD and GT2 pulleys?

HTD (High Torque Drive) uses a rounded, curvilinear tooth profile optimized for higher torque loads with reduced stress concentration. GT2 uses a modified curvilinear profile with slightly tighter tolerances, often preferred for very high-precision positioning (e.g., high-resolution 3D printers). These pulleys are HTD-3M only and are not interchangeable with GT2 belts or pulleys.

🛒 Select your Gears (tooth count) and Bore diameter above, then add to cart.

 

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