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When your CNC router, 3D printer, or automation rig demands repeatable, slip-free motion, the wrong pulley turns a smooth project into a frustrating mess. Engineers, makers, and machine builders who rely on HTD-5M timing belt pulleys need a component that holds tight tolerances across every cycle. These stepped-hub drive pulleys are machined to suit 5M (5mm pitch) HTD timing belts and are available in two hub styles — K-type (keyway-ready) and BF-type (set-screw flange) — so you can match your shaft retention method without compromise.
Each pulley is machined from aluminum alloy, featuring a 16mm belt-contact width and a stepped hub design for secure shaft seating. Tooth counts range from 10T to 45T (5M10T–5M45T), with bore options spanning 5mm to 20mm (0.197" to 0.787"). The pitch diameter scales with tooth count: a 5M10T pulley has a pitch diameter of approximately 15.92mm (0.627"), while a 5M45T reaches approximately 71.62mm (2.820"). All variants accept standard HTD 5M belts with a 5mm tooth pitch and 2.06mm tooth depth.
Typical use cases include CNC router X/Y axis drives, RepRap and FDM 3D printer extruder and motion systems, laser engraver gantry drives, robotic arm joint actuators, and light-duty conveyor indexing systems. Long-tail search terms this product covers: "HTD 5M timing pulley 20 teeth 8mm bore", "5mm pitch CNC belt pulley aluminum", "BF-type timing pulley with flange set screw".
Choose K-type (keyway slot for key-and-set-screw retention) or BF-type (flanged hub with set-screw holes) to match your shaft and assembly method.
Available from 10T to 45T, letting you dial in your drive ratio without sourcing multiple suppliers. Tooth counts: 10, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 32, 34, 36, 38, 40, 42, 44, 45.
Bore sizes from 5mm to 20mm (0.197"–0.787") cover the most common motor and shaft diameters used in CNC and robotics, including 6.35mm (1/4") for imperial shafts.
The integrated step hub provides axial location on the shaft and reduces belt misalignment, extending belt life in continuous-duty applications.
Machined groove width accommodates standard 16mm-wide HTD 5M belts, balancing load capacity and compact footprint for space-constrained builds.
Lightweight yet rigid aluminum alloy body keeps rotational inertia low for responsive acceleration in servo and stepper motor applications.
| Belt Type | HTD 5M |
|---|---|
| Tooth Pitch | 5mm (0.197") |
| Tooth Depth | 2.06mm (0.081") |
| Belt Width (groove) | 16mm (0.630") |
| Number of Teeth | 10T – 45T (see variant options) |
| Hub Style | K-type (keyway) / BF-type (flanged set-screw) |
| Bore Diameter | 5 / 6 / 6.35 / 8 / 10 / 12 / 12.7 / 14 / 15 / 16 / 17 / 18 / 19 / 20mm (see variant options) |
| Pitch Diameter Range | ~15.92mm (10T) – ~71.62mm (45T) |
| Material | Aluminum alloy |
| Finish | See variant options |
| Quantity per Order | 1 piece |
The tooth count determines your drive ratio. Divide the driven pulley teeth by the drive pulley teeth to get the ratio. For example, a 20T drive and 40T driven pulley gives a 2:1 reduction. For CNC and 3D printers, 20T is a common starting point for balanced speed and torque. Smaller tooth counts (10T–15T) suit high-speed, low-torque setups; larger counts (30T–45T) provide more torque at lower speeds.
K-type pulleys have a keyway slot machined into the bore, designed to be used with a matching key and set screw for positive rotational locking — ideal for high-torque or reversing loads. BF-type pulleys use a flanged hub with set-screw holes that clamp directly onto the shaft without a key, making them easier to install and reposition. Choose K-type for demanding drives and BF-type for lighter-duty or frequently adjusted setups.
Match the bore to your motor or drive shaft diameter exactly. Common stepper motor shaft sizes are 5mm and 6.35mm (1/4"); servo motors often use 8mm or 10mm shafts. If your shaft is imperial (e.g., 1/4"), select the 6.35mm bore option. Always measure your shaft with calipers before ordering — a bore that is even 0.1mm too small will not fit without machining.
Yes — these pulleys are machined to the HTD 5M standard (5mm pitch, 2.06mm tooth depth) and will mesh correctly with any HTD 5M timing belt from any manufacturer. Ensure your belt width is 16mm or narrower to fit the pulley groove. Do not use with T5 or GT2 belts, as those have different tooth profiles and are not interchangeable.
Aluminum alloy pulleys are well-suited for the majority of CNC, 3D printing, laser cutting, and light robotics applications. They handle the belt tension and torque generated by NEMA 17 and NEMA 23 stepper motors without issue. For very high-torque industrial drives or abrasive environments, consider steel pulleys instead. The aluminum construction keeps weight low, which is beneficial for moving gantries where inertia matters.
Aluminum naturally forms a thin oxide layer that provides good corrosion resistance in typical indoor environments — workshops, labs, and enclosed machines. For outdoor or high-humidity applications, an anodized finish adds extra protection. These pulleys are not recommended for direct exposure to saltwater or strong acids without additional surface treatment.
Yes. You can use any combination of tooth counts from this range on both the drive (motor) and driven (load) sides. Just ensure both pulleys share the same HTD 5M belt standard and that your belt length is calculated to span the center distance between the two pulleys correctly. Online belt length calculators can help you determine the right belt length once you know your pulley tooth counts and center distance.
