HTD-5M 10T-40T Timing Belt Pulley Pitch 5mm AF-type CNC Drive Pulleys Width 11mm

The tooth count determines the pitch diameter and, combined with your mating pulley, sets the drive ratio. A smaller pulley (e.g., 10T on the motor) paired with a larger pulley (e.g., 20T on the driven shaft) gives a 2:1 speed reduction and doubles torque. Use the formula: Pitch Diameter = (Teeth × Pitch) ÷ π. For CNC and 3D printers, 16T–20T on the motor is a common starting point for balanced speed and torque.

Match the bore to your motor shaft diameter. NEMA 17 steppers typically have a 5mm shaft — select the 5mm bore. NEMA 23 steppers commonly use 6.35mm (1/4") or 8mm shafts. Servo motors vary widely; check your motor datasheet. If your shaft is imperial (e.g., 1/4" = 6.35mm, 1/2" = 12.7mm), we stock those sizes as well.

Yes. These pulleys are designed for HTD 5M synchronous timing belts with a 5mm pitch and 11mm width. Ensure your belt is labeled "5M" or "HTD-5M" and has a width of 11mm (or wider belts trimmed to fit). Do not use with T5 or GT2 belts — those have different tooth profiles and are not interchangeable.

The AF-type set-screw design is suitable for light to moderate torque applications such as CNC routing, 3D printing, and laser engraving. For high-torque or high-shock applications, consider using a shaft with a flat (D-shaft) to improve grip, or apply thread-locking compound to the set screw. Always torque the set screw to the manufacturer's specification for your screw size.

The aluminum alloy body with anodized finish provides good resistance to oxidation and light corrosion in typical indoor environments. They are not rated for submersion or prolonged exposure to harsh chemicals. For outdoor or high-humidity environments, periodic inspection is recommended. The anodized layer also reduces surface wear from belt contact.

Yes — HTD-5M pulleys are widely used in 3D printers (particularly CoreXY and Cartesian designs with 5M belt systems), laser engravers, and CNC routers. Verify that your machine uses 5M belts (not GT2 2mm pitch belts, which are different). Check the bore matches your motor shaft and that the 11mm belt width aligns with your belt and idler setup.

HTD-5M uses a 5mm pitch with a rounded (curvilinear) tooth profile optimized for higher torque transmission. GT2 refers to a 2mm pitch Gates-style profile common in desktop 3D printers. T5 uses a trapezoidal tooth profile with 5mm pitch but different geometry. These profiles are NOT interchangeable — always match pulley and belt tooth profile exactly.