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When your CNC router stalls mid-cut or your 3D printer loses steps because a worn pulley slips, the entire project is compromised. Engineers, makers, and automation builders who rely on repeatable linear motion need pulleys that hold tight tolerances and resist wear over thousands of cycles. These 5M timing belt pulleys are designed for exactly that demand.
Each pulley is machined from aluminum alloy with a hard-anodized or natural finish and is compatible with standard 5M pitch (5mm pitch) timing belts at 15mm width (0.59 in). Tooth counts range from 10T to 18T, and bore diameters span 5mm to 12mm (0.20 in to 0.47 in), covering the most common shaft sizes used in motion-control assemblies. Two flange styles are available: K type (with set-screw collar) and BF type (flanged hub).
Typical use cases include CNC router X/Y axis drives, 3D printer extruder and gantry systems, laser engraver motion stages, and light-duty conveyor automation — anywhere a 5M belt pulley for 15mm belt width is required for synchronized, slip-free power transmission.
Available in 10T, 12T, 14T, 15T, 16T, and 18T to match your drive ratio requirements without custom machining.
Bore options from 5mm to 12mm (0.20–0.47 in) accommodate the most common stepper motor and servo shaft diameters used in CNC and automation.
K type features a set-screw locking collar for quick shaft mounting; BF type offers a flanged hub for applications requiring lateral belt retention.
5mm tooth pitch ensures accurate synchronization with 5M timing belts, minimizing backlash in positioning systems and servo-driven stages.
Lightweight yet rigid aluminum body reduces rotational inertia while maintaining dimensional stability across typical operating temperatures.
Order 1 to 5 pieces per variant to match your project or production run needs without overstocking.
| Belt Pitch | 5M (5mm) |
|---|---|
| Belt Width Compatibility | 15mm (0.59 in) |
| Tooth Count (T) | 10T / 12T / 14T / 15T / 16T / 18T |
| Bore Diameter | 5 / 6 / 6.35 / 7 / 8 / 10 / 11 / 12mm |
| Hub Style | K type (set-screw) / BF type (flanged) |
| Material | Aluminum alloy |
| Outer Diameter | See variant options |
| Hub Length | See variant options |
| Flange Diameter | See variant options |
| Surface Finish | See variant options |
| Quantity per Order | 1 / 2 / 3 / 4 / 5 pcs |
The tooth count determines your drive ratio. A smaller pulley (e.g., 10T) on the motor paired with a larger pulley on the driven shaft reduces speed and increases torque. For 1:1 drives — common in CoreXY 3D printers — use matching tooth counts on both ends. Calculate your steps-per-mm or linear resolution based on tooth count × belt pitch (5mm) ÷ motor steps per revolution.
K type pulleys have a set-screw collar that clamps directly onto the shaft — easy to install and reposition. BF type pulleys feature a flanged hub that provides lateral belt retention, helping keep the belt centered on the pulley face during operation. BF type is preferred in applications where belt tracking is critical, such as high-speed conveyor or laser cutter stages.
Most NEMA 17 stepper motors use a 5mm shaft; NEMA 23 motors typically use an 8mm or 1/4-inch (6.35mm) shaft. Servo motors vary — check your motor datasheet for the exact shaft diameter before ordering. If your shaft diameter falls between standard bore sizes, a bore that is slightly larger can be used with a shaft collar or keyway adapter.
No. These pulleys are designed specifically for 5M trapezoidal-profile timing belts with a 5mm pitch. GT2 belts use a 2mm pitch with a curvilinear tooth profile, and HTD 5M belts use a rounded tooth profile — neither is interchangeable with the trapezoidal 5M profile used here. Always match pulley tooth profile to belt tooth profile for proper meshing.
Aluminum alloy pulleys are well-suited for CNC routers, laser engravers, and 3D printers operating at typical feed rates and loads. For heavy-duty industrial applications with sustained high torque or abrasive environments, steel pulleys may be more appropriate. For most DIY and light-production CNC builds, aluminum provides an excellent balance of weight, machinability, and durability.
K type pulleys include a set-screw that tightens against the shaft to prevent rotation. For smooth shafts, this is typically sufficient for light-to-medium loads. For higher torque applications, a flat ground onto the shaft (D-shaft) aligned with the set screw significantly improves holding strength. BF type pulleys may use a different fastening method — refer to the specific variant details or contact us to confirm.
Yes. Each variant is a unique combination of tooth count, hub type, and bore size. Add each required variant to your cart separately and select the quantity (1–5 pcs) for each. This allows you to build a complete drive system — motor pulley and idler pulley — in a single order.
