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When a slipping or mismatched pulley throws off your CNC router or 3D printer's axis accuracy, every print layer and every cut suffers. Engineers, makers, and machine builders who need repeatable, low-backlash motion control rely on correctly spec'd 5M timing belt pulleys to keep their systems running true. Whether you're building from scratch or replacing a worn component, selecting the right tooth count and bore diameter is the first step to consistent results.
These 5M timing belt pulleys are machined from aluminum alloy with a set-screw bore for secure shaft mounting. The 5M pitch (5mm tooth spacing) suits medium-duty synchronous drive applications. Tooth counts range from 10T to 100T, bore diameters span 5mm to 25mm (approximately 0.20" to 0.98"), and the pulley groove is sized for 15mm wide 5M belts. Each listing ships as 1 piece.
Typical use cases include CNC router X/Y/Z axis drives, FDM 3D printer extruder and motion systems, laser engraver gantry drives, and custom automation or robotics belt-drive assemblies requiring a 5M synchronous belt.
| Belt Pitch | 5M (HTD 5M, 5mm tooth spacing) |
|---|---|
| Tooth Count | 10T – 100T (see variant options) |
| Bore Diameter | 5mm – 25mm (see variant options) |
| Compatible Belt Width | 15mm |
| Material | Aluminum alloy |
| Bore Retention | Set screw |
| Tooth Profile | HTD (rounded) |
| Quantity per Order | 1 piece |
| Finish | See variant options |
| Flange | See variant options |
The tooth count determines your drive ratio. Pair a smaller pulley on the motor shaft with a larger pulley on the driven shaft to reduce speed and increase torque, or use equal tooth counts for a 1:1 ratio. For most 3D printer motion systems (CoreXY, Cartesian), 20T pulleys on stepper shafts are a common starting point. For CNC routers, match the tooth count to your desired steps-per-mm calculation based on your controller's microstepping setting.
NEMA 17 stepper motors typically have a 5mm output shaft. Select the 5mm bore variant for a direct fit. If your motor has a D-cut shaft, the set screw will engage the flat to prevent rotation. For NEMA 23 motors, the shaft is commonly 6.35mm (1/4") or 8mm — check your motor's datasheet and select the matching bore.
These pulleys use the HTD 5M tooth profile, which features a rounded tooth form. They are designed for HTD 5M belts. While the pitch (5mm) is the same as some trapezoidal 5M belts, the tooth profiles differ and mixing profiles can cause accelerated wear or skipping under load. Use HTD 5M belts for reliable engagement.
The set screw provides adequate retention for typical CNC and 3D printer torque levels when properly tightened against the shaft. For applications with D-cut or flat-keyed shafts, the set screw engages the flat for additional anti-rotation security. For very high-torque applications, consider using thread-locking compound on the set screw and verify the bore-to-shaft fit is snug (H7 tolerance or similar).
Aluminum alloy naturally forms a thin oxide layer that provides good corrosion resistance in typical indoor workshop and machine environments. For humid or chemically aggressive environments, a light coating of machine oil on the bore and set-screw area is sufficient protection. The tooth surface does not require lubrication when used with standard rubber or polyurethane HTD 5M belts.
Yes. Belt-driven Z-axis designs (common on CoreXZ and some bed-slinger printers) use 5M or 2GT belts depending on the design. Confirm your printer's belt specification is 5M HTD before ordering. Select a tooth count that matches your existing drive pulley or achieves your target Z-axis resolution based on your lead screw or direct-drive ratio.
The pitch diameter of a 5M pulley increases proportionally with tooth count: approximately PD (mm) = (Tooth Count × 5) ÷ π. For example, a 20T pulley has a pitch diameter of roughly 31.8mm (~1.25"), while a 60T pulley is approximately 95.5mm (~3.76"). Larger tooth counts result in larger pulleys, which affects the physical envelope of your drive system and the achievable gear ratio.
