HTD-3M 15-40Teeth Timing Belt Pulley Pitch 3mm AF-type CNC Drive Wheel Width 7mm
HTD-3M 15-40Teeth Timing Belt Pulley Pitch 3mm AF-type CNC Drive Wheel Width 7mm
HTD-3M 15-40Teeth Timing Belt Pulley Pitch 3mm AF-type CNC Drive Wheel Width 7mm
HTD-3M 15-40Teeth Timing Belt Pulley Pitch 3mm AF-type CNC Drive Wheel Width 7mm
HTD-3M 15-40Teeth Timing Belt Pulley Pitch 3mm AF-type CNC Drive Wheel Width 7mm
HTD-3M 15-40Teeth Timing Belt Pulley Pitch 3mm AF-type CNC Drive Wheel Width 7mm
HTD-3M 15-40Teeth Timing Belt Pulley Pitch 3mm AF-type CNC Drive Wheel Width 7mm
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HTD-3M 15-40Teeth Timing Belt Pulley Pitch 3mm AF-type CNC Drive Wheel Width 7mmHTD-3M 15-40Teeth Timing Belt Pulley Pitch 3mm AF-type CNC Drive Wheel Width 7mmHTD-3M 15-40Teeth Timing Belt Pulley Pitch 3mm AF-type CNC Drive Wheel Width 7mmHTD-3M 15-40Teeth Timing Belt Pulley Pitch 3mm AF-type CNC Drive Wheel Width 7mmHTD-3M 15-40Teeth Timing Belt Pulley Pitch 3mm AF-type CNC Drive Wheel Width 7mmHTD-3M 15-40Teeth Timing Belt Pulley Pitch 3mm AF-type CNC Drive Wheel Width 7mmHTD-3M 15-40Teeth Timing Belt Pulley Pitch 3mm AF-type CNC Drive Wheel Width 7mm

HTD-3M 15-40Teeth Timing Belt Pulley Pitch 3mm AF-type CNC Drive Wheel Width 7mm

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Price:
$4.20 USD
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In stock (500 units), ready to be shipped

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Description

HTD-3M Timing Belt Pulley AF-Type — Precision CNC Drive Wheel for 3mm Pitch Belts

When a slipping or misaligned drive pulley is costing you accuracy on your CNC router, 3D printer, or automation rig, the root cause is often a pulley that was never machined to the tolerances your application demands. Engineers and makers who need repeatable, zero-backlash motion rely on HTD-3M AF-type timing belt pulleys with a confirmed 3mm pitch and 7mm belt width to keep every axis locked in sync.

These HTD-3M timing belt pulleys are machined from aluminum alloy and feature an AF-type flange configuration with a 7mm belt-contact width. Tooth count spans 15 T to 40 T, and bore options range from 4 mm (0.157 in) to 25 mm (0.984 in), covering the most common motor shaft diameters used in hobby and light-industrial motion systems. Outer diameter scales with tooth count — typically 14 mm (0.55 in) for a 15 T pulley up to approximately 38 mm (1.50 in) for a 40 T pulley.

Typical use cases include CNC milling and routing machines requiring precise X/Y axis drive, desktop 3D printers using GT2/HTD belt systems, and small robotic arms or pick-and-place automation where synchronous motion is critical. Long-tail search terms this product addresses: 3mm pitch timing pulley aluminum, HTD 3M pulley 20 teeth 5mm bore, AF type CNC belt drive wheel.

⚙️ Compatible with: HTD-3M open-loop and closed-loop timing belts with 7mm width. Verify bore diameter matches your motor or drive shaft before ordering.

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

🔩 AF-Type Flange Design

Single-side flange (AF configuration) keeps the belt tracking reliably on one side while allowing easy belt installation and removal from the open side.

📐 3mm HTD Tooth Profile

Rounded HTD tooth geometry distributes load across a larger contact area than trapezoidal profiles, reducing tooth shear stress and extending belt life under continuous duty.

🎯 Wide Tooth Count Range (15 T – 40 T)

Nineteen tooth-count options let you dial in the exact drive ratio your motion system needs without resorting to custom machining or stacked pulleys.

🔧 Multi-Bore Availability (4 mm – 25 mm)

Bore options cover standard metric and imperial shaft sizes including 4, 5, 6, 6.35, 7, 8, 10, 12, 12.7, 14, 15, 16, 17, 18, 19, 20, and 25 mm — select the exact fit for your motor shaft.

⚡ Aluminum Alloy Construction

Lightweight aluminum alloy body keeps rotational inertia low for fast acceleration and deceleration cycles, a key advantage in high-speed CNC and 3D-printing applications.

🏭 CNC-Machined Bore & Teeth

Bore and tooth profile are CNC-machined to tight tolerances, ensuring concentricity between the bore centerline and pitch circle for smooth, vibration-free operation.

📐 Technical Specifications — HTD-3M Timing Belt Pulley

Belt Pitch 3 mm (HTD-3M)
Belt Width Compatibility 7 mm
Tooth Count Options 15 T, 16 T, 17 T, 18 T, 19 T, 20 T, 22 T, 24 T, 25 T, 26 T, 27 T, 28 T, 30 T, 32 T, 34 T, 35 T, 36 T, 38 T, 40 T
Bore Options 4, 5, 6, 6.35, 7, 8, 10, 12, 12.7, 14, 15, 16, 17, 18, 19, 20, 25 mm
Flange Type AF (single-side flange)
Material Aluminum alloy
Outer Diameter (approx.) See variant options (scales with tooth count)
Hub Width See variant options
Tooth Profile HTD (High Torque Drive), rounded
Finish Natural anodized / machined aluminum
Quantity per Order 1 piece

❓ Frequently Asked Questions

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

Tooth count determines your drive ratio. Divide the driven pulley teeth by the drive pulley teeth to get the ratio. For a 1:1 ratio use matching tooth counts on both ends. For speed reduction, use a smaller drive pulley and a larger driven pulley. Common CNC setups use 20 T pulleys on NEMA 17 motors paired with 20 T idlers for a 1:1 ratio, while 3D printers often use 16 T or 20 T drive pulleys.

What bore size should I order for a NEMA 17 stepper motor?

NEMA 17 stepper motors typically have a 5 mm output shaft. Select the 5 mm bore variant. If your motor has a D-cut shaft, the set screw on the pulley hub will lock onto the flat. For NEMA 23 motors with an 8 mm shaft, choose the 8 mm bore variant.

Is this pulley compatible with GT2 belts?

No. This pulley uses the HTD-3M tooth profile, which has a rounded tooth form. GT2 belts use a different tooth geometry and are not interchangeable with HTD-3M pulleys. Always match the belt profile (HTD-3M) and pitch (3 mm) to the pulley. Using a mismatched belt will cause skipping and premature wear.

How strong is an aluminum timing pulley compared to steel?

Aluminum alloy pulleys are well-suited for light-to-medium duty CNC, 3D printing, and robotics applications where torque loads are moderate. Aluminum offers a favorable strength-to-weight ratio and resists corrosion without surface treatment. For heavy industrial drives with high torque and shock loads, steel pulleys are typically specified. For the applications this pulley targets — desktop CNC, 3D printers, small automation — aluminum is the standard choice.

Does the pulley come with a set screw for shaft locking?

AF-type pulleys in this series typically include a set screw in the hub for shaft retention. The set screw engages the motor shaft directly or onto a D-flat. If your application requires a keyway, contact us to confirm availability before ordering.

What is the difference between AF-type and A-type pulleys?

AF-type pulleys have a single flange on one side of the belt groove, which helps guide the belt and prevent it from walking off the pulley under lateral load. A-type (no flange) pulleys rely on belt tension and alignment alone. AF-type is recommended when the belt path is not perfectly aligned or when the drive operates at higher speeds where belt tracking is critical.

Can I use this pulley for a closed-loop belt system?

Yes. These pulleys are compatible with both open-loop (cut-to-length) and closed-loop (endless) HTD-3M timing belts with 7 mm width. Ensure the belt inner circumference matches your center-to-center distance calculation. Standard closed-loop HTD-3M belts are available in a range of lengths to suit most CNC and robotics builds.

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

 

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