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When your motion control project demands repeatable, slip-free power transmission, a mismatched or undersized pulley is the first point of failure. Engineers, makers, and CNC builders working with HTD-5M timing belt pulleys need a component that locks onto the shaft without play, transfers torque without creep, and fits the belt profile exactly — every time.
These HTD-5M timing belt pulleys feature a 5mm pitch HTD tooth profile machined to match standard 5M open or closed-loop timing belts. The pulley body is 16mm wide (AF-type flange configuration) and is available in tooth counts from 14T to 70T, with bore diameters ranging from 8mm to 28mm (approximately 0.31–1.10 in). Each unit includes a precision-cut keyway sized to match the bore — 3×1.4mm, 4×1.8mm, 5×2.3mm, 6×2.8mm, or 8×3.3mm — ensuring positive shaft engagement with a standard key.
Typical applications include DIY CNC router X/Y axis drives using HTD-5M timing belt pulley sets, 3D printer extruder and motion systems requiring 5mm pitch synchronous pulleys, and robotics joint actuators or conveyor drives where a keyed timing pulley with 16mm belt width is specified.
Available from 14T to 70T, covering a broad gear ratio range for speed reduction or torque multiplication in CNC and automation drives.
Machined to the HTD-5M tooth geometry for positive engagement with standard 5M timing belts — no slippage under load.
The AF-type flange configuration keeps the belt tracked laterally. Pulley body width is 16mm, compatible with 15–16mm wide HTD-5M belts.
Each pulley ships with a keyway pre-cut to match the bore size (3×1.4mm up to 8×3.3mm), enabling secure, torque-positive shaft mounting with a standard parallel key.
Bore diameters from 8mm to 28mm (≈0.31–1.10 in) accommodate a wide range of motor and drive shafts without custom machining.
Suited for CNC routers, 3D printers, laser cutters, robotics joints, conveyor systems, and any synchronous belt drive requiring a 5mm pitch keyed pulley.
| Belt Pitch | 5mm (HTD-5M) |
|---|---|
| Tooth Profile | HTD (High Torque Drive) |
| Number of Teeth | 14T – 70T (see variant options) |
| Pulley Width | 16mm |
| Flange Type | AF-type (with flange) |
| Bore Diameter | 8mm – 28mm (see variant options) |
| Keyway Dimensions | 3×1.4mm / 4×1.8mm / 5×2.3mm / 6×2.8mm / 8×3.3mm (see variant options) |
| Compatible Belt Width | 15mm – 16mm |
| Material | See variant options |
| Surface Finish | See variant options |
| Unit Quantity | 1 piece per order |
The tooth count determines the pitch diameter and, combined with your motor pulley, sets the drive ratio. A smaller tooth count (e.g., 14T–20T) on the drive side gives speed reduction and torque multiplication. A larger tooth count (e.g., 40T–70T) on the driven side achieves the same effect. Calculate your required ratio first, then select the tooth count pair that fits your center distance and belt length.
Measure your motor or drive shaft diameter precisely with calipers. Available bores range from 8mm to 28mm. Select the bore that matches your shaft diameter exactly — the keyway and set screw (if used) handle the axial and rotational locking. If your shaft is imperial (e.g., 1/2 in ≈ 12.7mm), select the 12.7mm bore option where available.
The keyway is sized to the bore following standard DIN 6885 / ISO 773 conventions. Smaller bores (8–10mm) use a 3×1.4mm keyway; 11–14mm bores use 4×1.8mm; 15–19mm bores use 5×2.3mm; 18–22mm bores use 6×2.8mm; and 24–28mm bores use 8×3.3mm. The exact keyway for your selected variant is shown in the variant name.
Yes. These pulleys are machined to the HTD-5M tooth profile (5mm pitch, HTD curve geometry) and are compatible with any standard HTD-5M open or closed-loop timing belt with a 15mm or 16mm belt width. They are not compatible with GT2, T5, or other pitch belts.
The load capacity depends on the material, tooth count, belt tension, and operating speed. For typical DIY CNC routers, 3D printers, and light robotics joints operating within the rated belt tension of standard HTD-5M belts, these pulleys are well-suited. For heavy industrial loads or continuous high-speed operation, contact us to confirm suitability for your specific torque and speed requirements.
Corrosion resistance depends on the material and surface finish of the specific variant. If your application involves moisture, coolant exposure, or outdoor conditions, contact us to confirm the material specification before ordering. For most indoor CNC, 3D printing, and robotics environments, standard material options are appropriate.
The keyway is pre-cut but a key is not included in the package. You can use the pulley with a set screw alone for light-duty or low-torque applications, but for reliable torque transmission — especially in reversing or high-load drives — using a parallel key in the keyway is strongly recommended to prevent shaft slippage.
