HTD-5M 25-38T Timing Belts Pulley AF-type Drive Pulleys For 15/20mm Width Belt

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HTD-5M 25-38T Timing Belts Pulley AF-type Drive Pulleys For 15/20mm Width Belt

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By HomeDIYer®

Types: 5M-25T

Bore: 5mm

Amount: 1pcs

Price:

$5.10 USD

Stock:

In stock (500 units), ready to be shipped

Quantity:

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HTD-5M AF-Type Timing Belt Pulleys — Precision Drive Components for 15/20mm Belts

Engineers and makers building motion-control systems often struggle to find timing pulleys that combine dimensional accuracy with a wide bore selection in a single listing. These HTD-5M AF-type drive pulleys are designed for builders who need a reliable, drop-in sprocket for CNC routers, 3D printers, robotics platforms, and automated conveyor systems — without sourcing multiple part numbers.

Each pulley is machined from aluminum alloy with an anodized finish, featuring the standard HTD-5M tooth profile (5 mm pitch). The AF-type hub includes a set-screw bore for secure shaft retention. Available tooth counts range from 10T to 70T, with outer diameters scaling accordingly from approximately 16 mm (0.63 in) for 10T up to approximately 111 mm (4.37 in) for 70T. Bore options span 5 mm to 30 mm (0.20–1.18 in) to suit common motor and shaft standards. Belt width compatibility: 15 mm and 20 mm.

Typical use cases include: CNC axis drives requiring repeatable positioning, 3D printer extruder and motion systems using HTD-5M open-loop belts, and light-duty industrial conveyor or indexing tables where a compact aluminum pulley reduces rotating inertia compared to steel alternatives.

⚙️ Compatibility: HTD-5M timing belts (5 mm pitch) — 15 mm and 20 mm belt widths. Verify bore diameter and tooth count match your shaft and belt before ordering.

✅ Key Features of These HTD-5M AF-Type Timing Belt Pulleys

🔩 AF-Type Set-Screw Hub

Flanged hub with radial set screw locks securely onto shafts from 5 mm to 30 mm without additional machining.

📐 HTD-5M Tooth Profile

Standard 5 mm pitch curvilinear tooth geometry ensures smooth meshing and reduced belt stress versus trapezoidal profiles.

🏗️ Aluminum Alloy Construction

Lightweight anodized aluminum body reduces rotational inertia — beneficial for high-acceleration servo and stepper motor applications.

🎯 Wide Tooth Count Range

10T through 70T available in a single listing, enabling precise gear-ratio selection without sourcing from multiple suppliers.

📏 Dual Belt Width Support

Flanges sized for both 15 mm and 20 mm wide HTD-5M belts — confirm your belt width when selecting the variant.

🔄 Broad Bore Selection

Bore options from 5 mm to 30 mm (including 6.35 mm / 1/4 in and 12.7 mm / 1/2 in imperial sizes) cover most stepper, servo, and DC motor shaft standards.

📐 Technical Specifications — HTD-5M Timing Belt Pulley

Belt Type	HTD-5M (5 mm pitch, curvilinear)
Tooth Count (Types)	10T, 12T, 14T, 15T, 16T, 18T, 19T, 20T, 22T, 24T, 25T, 26T, 28T, 30T, 32T, 35T, 36T, 38T, 40T, 42T, 45T, 48T, 50T, 60T, 65T, 70T
Bore Diameter	5, 6, 6.35, 7, 8, 10, 11, 12, 12.7, 14, 15, 16, 17, 18, 19, 20, 22, 25, 30 mm
Compatible Belt Width	15 mm / 20 mm
Hub Type	AF-type (flanged, set-screw retention)
Material	Aluminum alloy (anodized)
Pitch Diameter	See variant options
Outer Diameter	See variant options
Flange Diameter	See variant options
Hub Length	See variant options
Weight (per piece)	See variant options
Quantity per Order	1 pc

❓ Frequently Asked Questions

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

The tooth count determines the pitch diameter and, combined with your motor pulley, sets the drive ratio. Divide the desired output speed by the input speed to get the ratio, then select tooth counts accordingly. For example, a 20T driver and 40T driven pulley gives a 2:1 reduction. Larger tooth counts also increase the pitch diameter, which affects belt wrap and center distance.

Which bore size should I select for a NEMA 17 stepper motor?

Standard NEMA 17 stepper motors have a 5 mm output shaft. Select the 5 mm bore variant. If your motor has a D-cut shaft, the set screw in the AF-type hub will engage the flat to prevent rotation. For NEMA 23 motors with an 8 mm shaft, choose the 8 mm bore.

Are these pulleys compatible with both 15 mm and 20 mm wide HTD-5M belts?

Yes — the flanges on these pulleys are designed to accommodate both 15 mm and 20 mm wide HTD-5M belts. Confirm the belt width you are using and verify it falls within the 15–20 mm range. Using a belt narrower than the flange gap is acceptable; using a belt wider than the pulley face is not recommended.

What is the difference between HTD-5M and standard MXL or T5 timing profiles?

HTD (High Torque Drive) profiles use a curvilinear (rounded) tooth shape, which distributes load more evenly across the belt tooth and reduces stress concentration compared to trapezoidal profiles like MXL or T5. HTD-5M pulleys are not interchangeable with MXL, T5, or GT2 belts — always match the pulley tooth profile to your belt profile.

Will the aluminum construction hold up in a continuous-duty industrial environment?

Anodized aluminum is suitable for light-to-medium duty applications such as CNC machines, 3D printers, and laboratory automation. For heavy-duty industrial environments with high torque, abrasive dust, or chemical exposure, consider whether a steel pulley would be more appropriate. The anodized surface provides moderate corrosion resistance for typical indoor use.

How do I install the pulley onto my shaft?

Slide the pulley onto the shaft until the desired axial position is reached. Tighten the set screw(s) in the AF-type hub using the appropriate hex key (typically M3 or M4 set screw). For D-cut shafts, align the set screw with the flat before tightening. Ensure the shaft end does not protrude beyond the hub face to avoid interference with adjacent components.

Can I use a 6.35 mm (1/4 inch) bore pulley with an imperial shaft?

Yes. The 6.35 mm bore corresponds to a standard 1/4-inch shaft, and the 12.7 mm bore corresponds to a 1/2-inch shaft. These imperial bore sizes are included specifically for compatibility with North American motor and gearbox standards. Verify the bore matches your shaft diameter before ordering.

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