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When your CNC router skips a step or your 3D printer loses position mid-print, the culprit is often a loose or misaligned pulley. Engineers, robotics builders, and automation hobbyists who demand repeatable, slip-free motion need a pulley that locks firmly onto the shaft and stays there. The HTD-5M timing belt pulley with expansion/tension sleeve is engineered for exactly that — delivering consistent torque transfer without set-screw damage to your shaft.
Each pulley is machined from aluminum alloy and features an HTD-5M tooth profile (5mm pitch) with a 27mm teeth width. The expansion sleeve (also called a tension or taper lock sleeve) clamps concentrically around the shaft bore, distributing clamping force evenly. Available tooth counts range from 18T to 45T, with sleeve bore diameters from 5mm to 32mm (approximately 0.20" to 1.26"), covering a wide range of motor and shaft sizes.
Typical use cases include HTD-5M CNC timing pulley replacement, stepper motor pulley for 3D printer drive systems, and servo motor synchronous pulley for robotic arm joints. The expansion sleeve design makes this an ideal taper lock timing pulley for applications where shaft removal and reinstallation are frequent.
| Belt Type | HTD-5M (5mm pitch, curvilinear) |
|---|---|
| Teeth Width | 27mm (1.06 in) |
| Number of Teeth | 18T, 20T, 22T, 24T, 25T, 26T, 28T, 30T, 32T, 34T, 35T, 36T, 38T, 40T, 42T, 44T, 45T |
| Sleeve Bore Diameter | 5mm, 6mm, 6.35mm, 8mm, 9mm, 10mm, 11mm, 12mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 22mm, 24mm, 25mm, 28mm, 30mm, 32mm |
| Mounting Type | Expansion / Tension Sleeve (Taper Lock) |
| Material | Aluminum Alloy |
| Pitch Diameter | See variant options |
| Outside Diameter | See variant options |
| Flange | See variant options |
| Finish | Natural / Anodized (see variant options) |
| Quantity per Order | 1 piece |
The number of teeth determines the pitch diameter and your drive ratio. Divide the driven pulley teeth by the driver pulley teeth to get the ratio. For example, a 20T driver and 40T driven pulley gives a 2:1 reduction. Use a smaller tooth count for higher speed output and a larger tooth count for more torque. Match the pitch diameter to your available center distance and belt length.
Select the bore diameter that matches your motor or shaft diameter exactly. Common stepper motor shaft sizes are 5mm and 6.35mm (1/4"). Servo motors often use 6mm, 8mm, or larger. Measure your shaft with calipers before ordering. The expansion sleeve accommodates the selected bore — do not attempt to use a bore larger than your shaft diameter.
The expansion sleeve (also called a tension or taper lock sleeve) is a split-ring collar that sits between the pulley hub and the shaft. When the clamping screws are tightened, the sleeve compresses concentrically around the shaft, creating a friction-based grip that distributes force evenly. This eliminates the point stress caused by set screws and prevents shaft marring. Clamping torque capacity depends on the bore size and sleeve design — contact us to confirm for your specific variant.
Yes. This pulley uses the HTD-5M tooth profile with a 5mm pitch, which is compatible with all standard HTD-5M timing belts. Ensure your belt width is 27mm or narrower to match the 27mm teeth width of this pulley. Using a belt wider than the pulley teeth width is not recommended as it may cause belt tracking issues.
Yes. HTD-5M pulleys are widely used in 3D printers (particularly CoreXY and Cartesian designs with wider belts), CNC routers, laser cutters, and other motion control systems. The 27mm teeth width provides higher torque capacity than the more common 16mm or 20mm width pulleys, making it suitable for heavier-duty or high-speed applications. Verify your belt width and center distance before selecting your tooth count.
A set-screw pulley uses one or two small screws that press directly against the shaft surface, which can cause indentations and make removal difficult. An expansion sleeve pulley uses a concentric clamping collar that grips the shaft evenly around its circumference. The expansion sleeve design offers better concentricity, easier removal, and no shaft damage — making it preferred for precision applications and iterative prototyping where the pulley may be repositioned multiple times.
The pulley is machined from aluminum alloy, which offers a good strength-to-weight ratio and natural corrosion resistance through its oxide layer. For indoor or dry environments, bare aluminum performs well without additional treatment. If used in humid or mildly corrosive environments, an anodized finish (where available) provides additional protection. Avoid prolonged exposure to salt water or strong acids.
