HTD-5M 10-24T Timing Belts Pulley AF-type Drive Pulleys For 15/20mm Width Belt

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HTD-5M 10-24T Timing Belts Pulley AF-type Drive Pulleys For 15/20mm Width Belt

HomeDIYer

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By HomeDIYer®

Types: 5M-10T

Tooth width: 16mm

Bore & Amount: 5mm & 1pcs

Price:

$3.20 USD

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In stock (500 units), ready to be shipped

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HTD-5M Timing Belt Pulley — AF-Type Drive Pulleys for Precise Power Transmission

Engineers and makers who rely on synchronous belt drives know the frustration of pulleys that slip, wobble, or arrive with incompatible bore sizes. These HTD-5M AF-type timing belt pulleys are designed for builders who need dimensionally consistent, drop-in-ready components for robotics, CNC routers, 3D printers, and light industrial automation — where every tooth counts.

Each pulley is machined from aluminum alloy with an anodized or natural finish and features the standard HTD-5M tooth profile (5 mm pitch). The AF-type hub design includes a set-screw bore for secure shaft mounting. Tooth counts range from 10T to 24T, tooth width options are 16 mm (~0.63 in) and 21 mm (~0.83 in), and bore sizes span 5 mm to 22 mm to accommodate a wide range of motor and shaft diameters.

Typical use cases include stepper motor drive systems for desktop CNC machines, belt-driven linear actuators in DIY automation rigs, and replacement pulleys for 3D printer extruder or axis drives using HTD-5M belts. The broad tooth-count range also makes these suitable for gear-ratio tuning in small-batch robotics prototyping.

⚙️ Compatibility: Designed for HTD-5M synchronous timing belts with 15 mm or 20 mm width. Verify belt width matches selected tooth width (16 mm hub for 15 mm belt; 21 mm hub for 20 mm belt). Confirm shaft diameter before selecting bore size.

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

🔩AF-Type Set-Screw Hub — Flat-face hub with radial set screw for positive shaft locking; compatible with standard keyed and keyless shafts.
📐HTD-5M Tooth Profile — 5 mm pitch curvilinear tooth geometry for smooth, low-noise engagement and reduced belt wear compared to trapezoidal profiles.
🎯Wide Tooth-Count Range (10T–24T) — Ten tooth-count options let you dial in the exact drive ratio needed for your stepper, servo, or DC motor application.
📏Dual Belt-Width Options — 16 mm tooth width for 15 mm belts; 21 mm tooth width for 20 mm belts — select the correct width to maximize belt contact and load capacity.
🔧Multiple Bore Sizes — Bore options from 5 mm to 22 mm (including 6.35 mm / ¼ in and 12.7 mm / ½ in imperial sizes) to fit common motor shaft diameters without custom machining.
⚡Aluminum Alloy Construction — Lightweight yet rigid material keeps rotational inertia low, making these pulleys well-suited for high-cycle, high-speed drive systems in automation and robotics.

📐 Technical Specifications — HTD-5M Timing Belt Pulley

Belt Profile	HTD-5M (5 mm pitch, curvilinear)
Tooth Count Options	10T, 12T, 14T, 15T, 16T, 18T, 19T, 20T, 22T, 24T
Tooth Width	16 mm (for 15 mm belt) / 21 mm (for 20 mm belt)
Bore Size Options	5, 6, 6.35, 7, 8, 10, 11, 12, 12.7, 14, 15, 16, 17, 18, 19, 20, 22 mm
Hub Type	AF-type (set-screw, flat-face hub)
Material	Aluminum alloy
Compatible Belt Width	15 mm (16 mm tooth width) / 20 mm (21 mm tooth width)
Outer Diameter	See variant options
Weight	See variant options
Surface Finish	See variant options

❓ Frequently Asked Questions

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

Tooth count determines the pulley's pitch diameter and, when paired with a second pulley, sets your drive ratio. A smaller tooth count (e.g., 10T) on the motor side and a larger count (e.g., 20T) on the driven side gives a 2:1 speed reduction. Use the formula: ratio = driven teeth ÷ driver teeth. For direct-drive or 1:1 setups, select matching tooth counts on both pulleys.

What is the difference between the 16 mm and 21 mm tooth width options?

The tooth width must match your belt width. The 16 mm tooth-width pulley is designed for 15 mm wide HTD-5M belts, while the 21 mm tooth-width pulley is designed for 20 mm wide HTD-5M belts. Using a mismatched width reduces belt contact area and can cause premature belt wear or tracking issues.

What bore size should I select for my motor shaft?

Measure your motor or drive shaft diameter precisely with calipers. Available bore sizes include metric options (5, 6, 7, 8, 10, 11, 12, 14, 15, 16, 17, 18, 19, 20, 22 mm) and imperial-friendly sizes (6.35 mm = ¼ in; 12.7 mm = ½ in). The AF-type set screw provides additional clamping force, but the bore should match the shaft diameter as closely as possible for concentricity.

Are these pulleys compatible with non-HTD 5M belts, such as GT2 or MXL profiles?

No. These pulleys use the HTD-5M curvilinear tooth profile, which is not interchangeable with GT2 (2 mm pitch), MXL, or other trapezoidal belt profiles. Always match the pulley tooth profile to your belt profile. HTD-5M belts have a 5 mm pitch and a rounded tooth shape distinct from GT2 or T5 profiles.

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

The AF-type hub uses a radial set screw that bears directly against the shaft. For light-to-medium loads typical of 3D printers, small CNC machines, and robotics, this connection is reliable when the screw is properly torqued. For high-torque applications, consider using a shaft with a flat (D-shaft) to increase the set-screw's grip surface and prevent rotation under load.

Can I use these pulleys in a corrosive or outdoor environment?

These pulleys are machined from aluminum alloy, which offers moderate corrosion resistance. For mildly humid or indoor industrial environments, they perform well without additional treatment. For outdoor or high-humidity applications, applying a light coat of corrosion-inhibiting lubricant or selecting an anodized variant is advisable. They are not recommended for direct exposure to saltwater or strong chemical environments without additional protection.

What is the pitch diameter for a given tooth count?

For HTD-5M pulleys, pitch diameter (PD) = (tooth count × pitch) ÷ π. For example: 20T → PD = (20 × 5) ÷ 3.1416 ≈ 31.83 mm. Use this to calculate center-to-center distance and required belt length for your drive system. Exact outer diameter values are listed in the variant options.

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