HTD-5M 14-70T Timing Belt Pulleys Pitch 5mm AF-type With Keyway Teeth Width 21mm
HTD-5M 14-70T Timing Belt Pulleys Pitch 5mm AF-type With Keyway Teeth Width 21mm
HTD-5M 14-70T Timing Belt Pulleys Pitch 5mm AF-type With Keyway Teeth Width 21mm
HTD-5M 14-70T Timing Belt Pulleys Pitch 5mm AF-type With Keyway Teeth Width 21mm
HTD-5M 14-70T Timing Belt Pulleys Pitch 5mm AF-type With Keyway Teeth Width 21mm
HTD-5M 14-70T Timing Belt Pulleys Pitch 5mm AF-type With Keyway Teeth Width 21mm
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HTD-5M 14-70T Timing Belt Pulleys Pitch 5mm AF-type With Keyway Teeth Width 21mmHTD-5M 14-70T Timing Belt Pulleys Pitch 5mm AF-type With Keyway Teeth Width 21mmHTD-5M 14-70T Timing Belt Pulleys Pitch 5mm AF-type With Keyway Teeth Width 21mmHTD-5M 14-70T Timing Belt Pulleys Pitch 5mm AF-type With Keyway Teeth Width 21mmHTD-5M 14-70T Timing Belt Pulleys Pitch 5mm AF-type With Keyway Teeth Width 21mmHTD-5M 14-70T Timing Belt Pulleys Pitch 5mm AF-type With Keyway Teeth Width 21mm

HTD-5M 14-70T Timing Belt Pulleys Pitch 5mm AF-type With Keyway Teeth Width 21mm

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Price:
$8.23 USD
Stock:
In stock (500 units), ready to be shipped

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Description

HTD 5M Timing Belt Pulleys — Precise AF-Type Drive for CNC, Robotics & Automation

When a slipping or misaligned pulley derails your CNC router mid-cut or stalls your robot arm at a critical moment, the root cause is almost always an undersized or poorly toleranced drive component. Engineers, makers, and machine builders who demand repeatable, zero-backlash motion need HTD 5M timing belt pulleys they can trust across thousands of cycles.

These AF-type pulleys feature a 5 mm HTD pitch profile machined from aluminum alloy, with a fixed teeth width of 21 mm (0.83 in). Bore options span 8 mm to 28 mm (0.31–1.10 in), and tooth counts run from 14 T to 70 T, giving pitch circle diameters of approximately 22.3 mm to 111.4 mm (0.88–4.39 in). Each pulley ships with a matching keyway — 3×1.4 mm, 4×1.8 mm, 5×2.3 mm, 6×2.8 mm, or 8×3.3 mm depending on bore size — for positive torque transmission without set-screw slip.

Typical use cases include 5M HTD belt drive systems for DIY CNC gantry axes, 3D printer extruder and motion upgrades requiring a 5mm pitch timing pulley with keyway, and compact servo or stepper motor drive trains in robotics and automation panels where a lightweight aluminum timing pulley keeps inertia low.

⚙️ Compatible with standard HTD 5M timing belts (5 mm pitch). Verify bore diameter and keyway dimensions against your shaft spec before ordering.

✅ Key Features of These HTD 5M Timing Belt Pulleys

🔩 AF-Type Flange Design

Integrated flanges on both sides keep the belt tracking true under lateral load, reducing edge wear and derailment risk in high-speed or reversing applications.

📐 HTD 5 mm Pitch Profile

The rounded HTD tooth form distributes load across a larger contact area than trapezoidal profiles, supporting higher torque transmission at equivalent belt tension.

🔑 Precision-Cut Keyway

Each pulley includes a machined keyway sized to the bore — from 3×1.4 mm up to 8×3.3 mm — ensuring positive shaft engagement and eliminating rotational slip under load.

⚖️ Aluminum Alloy Construction

Lightweight aluminum keeps rotational inertia low for fast acceleration and deceleration cycles, while offering adequate strength for typical CNC and robotics drive loads.

📏 Wide Tooth Count Range (14 T – 70 T)

Select from 31 tooth counts to dial in your exact gear ratio. Smaller counts (14–20 T) suit high-speed motor shafts; larger counts (40–70 T) work as driven pulleys for torque multiplication.

🔄 Multiple Bore Sizes (8–28 mm)

Bore options from 8 mm to 28 mm cover common stepper, servo, and DC motor shaft diameters, making these pulleys a direct fit for most DIY and light-industrial drive systems.

📐 Technical Specifications — HTD 5M Timing Belt Pulley

Belt Pitch 5 mm (HTD profile)
Pulley Type AF-type (flanged both sides)
Teeth Width 21 mm (0.83 in)
Number of Teeth 14 T – 70 T (see variant options)
Pitch Circle Diameter Approx. 22.3 mm – 111.4 mm (varies by tooth count)
Bore Diameter 8 mm – 28 mm (see variant options)
Keyway Dimensions 3×1.4 mm / 4×1.8 mm / 5×2.3 mm / 6×2.8 mm / 8×3.3 mm (see variant options)
Material Aluminum alloy
Finish See variant options
Compatible Belt HTD 5M timing belt (5 mm pitch)
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 circle diameter and, combined with your driven pulley, sets the drive ratio. For a motor shaft running at high RPM, choose a smaller driver pulley (14–20 T) paired with a larger driven pulley to reduce speed and multiply torque. For 1:1 drives, match tooth counts on both pulleys. Use the formula: ratio = driven teeth ÷ driver teeth.

What bore size should I select for my motor shaft?

Measure your motor or gearbox output shaft diameter with a caliper. Select the bore that matches exactly — a loose bore causes vibration and keyway wear. Common stepper motor shafts are 5 mm, 6.35 mm (1/4 in), 8 mm, and 10 mm; servo motors often use 10–20 mm shafts. If your shaft size is not listed, contact us to confirm availability.

What keyway size comes with each bore option?

Keyway dimensions are matched to bore size per standard DIN 6885 guidelines: 8–10 mm bore → 3×1.4 mm keyway; 10–12 mm bore → 4×1.8 mm keyway; 14–17 mm bore → 5×2.3 mm keyway; 18–22 mm bore → 6×2.8 mm keyway; 24–28 mm bore → 8×3.3 mm keyway. Select the Keyway & Amount variant that matches your shaft's existing keyway slot.

Are these pulleys compatible with any HTD 5M belt?

Yes — these pulleys are designed for standard HTD 5M timing belts with a 5 mm pitch. They are not compatible with T5, GT2, or other pitch profiles. Ensure your belt width is ≤21 mm to fit within the flanges. For wider belts, contact us about alternative flange configurations.

How strong are aluminum timing pulleys compared to steel?

Aluminum alloy pulleys offer a tensile strength of approximately 200–310 MPa depending on alloy grade, which is sufficient for most CNC, 3D printer, and light robotics applications. For heavy industrial drives with sustained high torque or shock loads, steel pulleys may be more appropriate. Aluminum's lower density significantly reduces rotational inertia, benefiting servo-driven axes that require rapid acceleration.

Do these pulleys require a set screw in addition to the keyway?

The keyway provides the primary torque transmission path and is sufficient for most applications. Adding a set screw over the key is common practice for extra axial retention, especially in reversing or vibration-prone drives. A shaft collar or retaining ring can also be used for axial positioning.

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

Yes. HTD 5M pulleys are widely used in CoreXY and Cartesian 3D printers, laser cutters, and pen plotters where the 5 mm pitch provides a good balance of resolution and torque capacity. Verify that your existing belt is HTD 5M pitch and that the bore matches your motor shaft before ordering.

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

 

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