HTD-3M 14-72T Timing Belt Pulley Pitch 3mm AF-type Drive Pulley Teeth Width 16mm
HTD-3M 14-72T Timing Belt Pulley Pitch 3mm AF-type Drive Pulley Teeth Width 16mm
HTD-3M 14-72T Timing Belt Pulley Pitch 3mm AF-type Drive Pulley Teeth Width 16mm
HTD-3M 14-72T Timing Belt Pulley Pitch 3mm AF-type Drive Pulley Teeth Width 16mm
HTD-3M 14-72T Timing Belt Pulley Pitch 3mm AF-type Drive Pulley Teeth Width 16mm
HTD-3M 14-72T Timing Belt Pulley Pitch 3mm AF-type Drive Pulley Teeth Width 16mm
HTD-3M 14-72T Timing Belt Pulley Pitch 3mm AF-type Drive Pulley Teeth Width 16mm
HTD-3M 14-72T Timing Belt Pulley Pitch 3mm AF-type Drive Pulley Teeth Width 16mm
HTD-3M 14-72T Timing Belt Pulley Pitch 3mm AF-type Drive Pulley Teeth Width 16mm
HTD-3M 14-72T Timing Belt Pulley Pitch 3mm AF-type Drive Pulley Teeth Width 16mm
HTD-3M 14-72T Timing Belt Pulley Pitch 3mm AF-type Drive Pulley Teeth Width 16mm
HTD-3M 14-72T Timing Belt Pulley Pitch 3mm AF-type Drive Pulley Teeth Width 16mm
HTD-3M 14-72T Timing Belt Pulley Pitch 3mm AF-type Drive Pulley Teeth Width 16mm
HTD-3M 14-72T Timing Belt Pulley Pitch 3mm AF-type Drive Pulley Teeth Width 16mm
HTD-3M 14-72T Timing Belt Pulley Pitch 3mm AF-type Drive Pulley Teeth Width 16mm
HTD-3M 14-72T Timing Belt Pulley Pitch 3mm AF-type Drive Pulley Teeth Width 16mm
HTD-3M 14-72T Timing Belt Pulley Pitch 3mm AF-type Drive Pulley Teeth Width 16mm
HTD-3M 14-72T Timing Belt Pulley Pitch 3mm AF-type Drive Pulley Teeth Width 16mm
HTD-3M 14-72T Timing Belt Pulley Pitch 3mm AF-type Drive Pulley Teeth Width 16mm
HTD-3M 14-72T Timing Belt Pulley Pitch 3mm AF-type Drive Pulley Teeth Width 16mm
HTD-3M 14-72T Timing Belt Pulley Pitch 3mm AF-type Drive Pulley Teeth Width 16mm
HTD-3M 14-72T Timing Belt Pulley Pitch 3mm AF-type Drive Pulley Teeth Width 16mm
HTD-3M 14-72T Timing Belt Pulley Pitch 3mm AF-type Drive Pulley Teeth Width 16mm
HTD-3M 14-72T Timing Belt Pulley Pitch 3mm AF-type Drive Pulley Teeth Width 16mm
HTD-3M 14-72T Timing Belt Pulley Pitch 3mm AF-type Drive Pulley Teeth Width 16mm
HTD-3M 14-72T Timing Belt Pulley Pitch 3mm AF-type Drive Pulley Teeth Width 16mm
HTD-3M 14-72T Timing Belt Pulley Pitch 3mm AF-type Drive Pulley Teeth Width 16mm
HTD-3M 14-72T Timing Belt Pulley Pitch 3mm AF-type Drive Pulley Teeth Width 16mm
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HTD-3M 14-72T Timing Belt Pulley Pitch 3mm AF-type Drive Pulley Teeth Width 16mmHTD-3M 14-72T Timing Belt Pulley Pitch 3mm AF-type Drive Pulley Teeth Width 16mmHTD-3M 14-72T Timing Belt Pulley Pitch 3mm AF-type Drive Pulley Teeth Width 16mmHTD-3M 14-72T Timing Belt Pulley Pitch 3mm AF-type Drive Pulley Teeth Width 16mmHTD-3M 14-72T Timing Belt Pulley Pitch 3mm AF-type Drive Pulley Teeth Width 16mmHTD-3M 14-72T Timing Belt Pulley Pitch 3mm AF-type Drive Pulley Teeth Width 16mmHTD-3M 14-72T Timing Belt Pulley Pitch 3mm AF-type Drive Pulley Teeth Width 16mmHTD-3M 14-72T Timing Belt Pulley Pitch 3mm AF-type Drive Pulley Teeth Width 16mmHTD-3M 14-72T Timing Belt Pulley Pitch 3mm AF-type Drive Pulley Teeth Width 16mmHTD-3M 14-72T Timing Belt Pulley Pitch 3mm AF-type Drive Pulley Teeth Width 16mmHTD-3M 14-72T Timing Belt Pulley Pitch 3mm AF-type Drive Pulley Teeth Width 16mmHTD-3M 14-72T Timing Belt Pulley Pitch 3mm AF-type Drive Pulley Teeth Width 16mmHTD-3M 14-72T Timing Belt Pulley Pitch 3mm AF-type Drive Pulley Teeth Width 16mmHTD-3M 14-72T Timing Belt Pulley Pitch 3mm AF-type Drive Pulley Teeth Width 16mmHTD-3M 14-72T Timing Belt Pulley Pitch 3mm AF-type Drive Pulley Teeth Width 16mmHTD-3M 14-72T Timing Belt Pulley Pitch 3mm AF-type Drive Pulley Teeth Width 16mmHTD-3M 14-72T Timing Belt Pulley Pitch 3mm AF-type Drive Pulley Teeth Width 16mmHTD-3M 14-72T Timing Belt Pulley Pitch 3mm AF-type Drive Pulley Teeth Width 16mmHTD-3M 14-72T Timing Belt Pulley Pitch 3mm AF-type Drive Pulley Teeth Width 16mmHTD-3M 14-72T Timing Belt Pulley Pitch 3mm AF-type Drive Pulley Teeth Width 16mmHTD-3M 14-72T Timing Belt Pulley Pitch 3mm AF-type Drive Pulley Teeth Width 16mmHTD-3M 14-72T Timing Belt Pulley Pitch 3mm AF-type Drive Pulley Teeth Width 16mmHTD-3M 14-72T Timing Belt Pulley Pitch 3mm AF-type Drive Pulley Teeth Width 16mmHTD-3M 14-72T Timing Belt Pulley Pitch 3mm AF-type Drive Pulley Teeth Width 16mmHTD-3M 14-72T Timing Belt Pulley Pitch 3mm AF-type Drive Pulley Teeth Width 16mmHTD-3M 14-72T Timing Belt Pulley Pitch 3mm AF-type Drive Pulley Teeth Width 16mmHTD-3M 14-72T Timing Belt Pulley Pitch 3mm AF-type Drive Pulley Teeth Width 16mmHTD-3M 14-72T Timing Belt Pulley Pitch 3mm AF-type Drive Pulley Teeth Width 16mm

HTD-3M 14-72T Timing Belt Pulley Pitch 3mm AF-type Drive Pulley Teeth Width 16mm

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$7.33 USD
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In stock (500 units), ready to be shipped

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Description

HTD-3M Timing Belt Pulley — Precise 3mm Pitch Drive for DIY Automation

When your CNC router skips steps or your 3D printer loses position mid-print, the culprit is often a mismatched or worn drive pulley. Makers, hobbyists, and small-workshop engineers who need repeatable, slip-free motion rely on HTD-3M timing belt pulleys to anchor their drive systems with confidence.

This AF-type HTD-3M pulley is machined with a 3mm pitch HTD tooth profile and a 16mm tooth width, available in tooth counts from 14T to 120T. Bore diameters range from 4mm to 20mm (approximately 0.16 in to 0.79 in), covering the most common motor shaft sizes used in DIY and light-industrial automation. The AF-type hub design allows a set-screw to lock the pulley securely onto the shaft without requiring a keyway.

Typical use cases include open-loop CNC axis drives where consistent tooth engagement prevents lost steps, FDM 3D printer extruder and motion systems that demand low backlash, and custom conveyor or pick-and-place rigs built around NEMA 17 or NEMA 23 stepper motors. The wide tooth-count selection also makes these pulleys suitable for gear-ratio tuning in belt-driven linear actuators and rotary indexers.

⚙️ Compatible with standard HTD-3M timing belts (3mm pitch). Verify bore diameter matches your motor or shaft before ordering.

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

🔩 AF-Type Hub with Set-Screw Lock
The AF-type bore design uses a radial set-screw to clamp directly onto the motor shaft — no keyway machining required, making installation straightforward on standard stepper and servo shafts.
📐 3mm HTD Tooth Profile
The HTD (High Torque Drive) curvilinear tooth form distributes load across a larger contact area than trapezoidal profiles, reducing tooth stress and improving torque capacity at moderate speeds.
🎯 Wide Tooth-Count Range: 14T – 120T
Twenty-three tooth-count options let you dial in the exact gear ratio your project needs — from compact 14T drive pulleys to large 120T driven pulleys for high-reduction belt stages.
🔄 Bore Sizes 4mm – 20mm
Thirteen bore diameter options (4, 5, 6, 6.35, 8, 10, 12, 14, 15, 16, 17, 19, 20mm) cover NEMA 17 (5mm), NEMA 23 (6.35mm / 8mm), and larger servo motor shafts without adapter sleeves.
📏 16mm Tooth Width
The 16mm belt-contact width provides a stable tracking surface for standard 3M belts, reducing the risk of belt walk-off during continuous operation in linear motion systems.
🏗️ Suited for CNC, 3D Printing & Custom Automation
Engineered for the torque and positional accuracy demands of open-loop stepper-driven systems, these pulleys are a direct fit for RepRap-style printers, DIY laser cutters, and belt-driven router axes.

📐 Technical Specifications — HTD-3M Timing Belt Pulley

Belt Type HTD-3M (3mm pitch, curvilinear tooth)
Tooth Pitch 3mm
Tooth Width 16mm
Hub Type AF-type (set-screw, no keyway)
Number of Teeth 14T, 15T, 16T, 18T, 20T, 24T, 25T, 28T, 30T, 32T, 35T, 36T, 40T, 45T, 48T, 50T, 60T, 70T, 72T, 80T, 90T, 100T, 120T
Bore Diameter 4, 5, 6, 6.35, 8, 10, 12, 14, 15, 16, 17, 19, 20mm — See variant options
Outer Diameter See variant options
Material See variant options
Finish / Colour See variant options
Quantity per Order 1 piece

❓ Frequently Asked Questions

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

The tooth count determines your drive ratio. Divide the driven pulley teeth by the drive pulley teeth to get the reduction ratio. For example, a 14T drive paired with a 70T driven pulley gives a 5:1 reduction. For direct-drive applications (e.g., 3D printer X/Y axes), matching tooth counts on both ends gives a 1:1 ratio. Select a smaller tooth count for higher speed and a larger tooth count for more torque.

Which bore diameter fits a NEMA 17 stepper motor shaft?

Standard NEMA 17 stepper motors have a 5mm output shaft. Select the 5mm bore variant for a direct fit. If your motor has a D-cut shaft, the set-screw in the AF-type hub will grip the flat, providing a secure lock without slipping.

Which bore diameter fits a NEMA 23 stepper motor shaft?

NEMA 23 motors typically use either a 6.35mm (1/4 inch) or 8mm shaft depending on the manufacturer. Check your motor's datasheet before ordering. Both bore sizes are available in this listing.

Is this pulley compatible with standard HTD-3M timing belts?

Yes. This pulley is designed for the HTD-3M belt standard — 3mm pitch with a curvilinear (rounded) tooth profile. It is not compatible with GT2 (2mm pitch) or MXL/XL trapezoidal belts. Always confirm the belt pitch matches the pulley pitch before assembly.

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

The AF-type set-screw hub provides adequate holding force for typical DIY stepper-driven loads (CNC routing, 3D printing, light conveyor). For applications with high shock loads or frequent direction reversals, consider using a shaft with a D-cut or flat, which gives the set-screw a positive mechanical stop and significantly increases slip resistance.

Does the pulley include flanges to keep the belt on track?

Flange configuration varies by tooth count and variant. Please check the product images for your selected variant. In general, smaller tooth-count pulleys (drive pulleys) are more commonly flanged to prevent belt walk-off, while larger driven pulleys may be unflanged. If belt tracking is critical for your application, confirm the flange detail in the images before ordering.

Can I use this pulley for a high-speed application?

HTD-3M pulleys are well-suited for moderate-speed, moderate-torque applications typical of DIY automation. For very high-speed spindle drives or industrial-duty continuous operation, consult the belt manufacturer's speed rating for the 3M profile and ensure your belt tension and alignment are within specification.

🛒 Select your tooth count and bore diameter above, then add to cart.

 

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