Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
When a slipping or mismatched pulley causes positioning errors in your CNC router, 3D printer, or automated conveyor, every lost step costs time and accuracy. Engineers and makers who demand repeatable, zero-backlash motion need a drive pulley that holds its tooth profile under load — and that is exactly what this BF-Type 3M timing belt pulley is designed to deliver.
Each pulley is machined to a 3mm pitch (3M) BF-Type tooth profile and is available in tooth counts from 50T to 120T, with bore diameters ranging from 6mm (~0.24 in) to 25mm (~0.98 in). Plain round bores and keyway bores (3×1.4mm, 4×1.8mm, 5×2.3mm, 6×2.8mm, 8×3.3mm) are offered to suit both set-screw and keyed shaft connections. Belt slot width is 16mm across all variants.
Typical applications include CNC milling and routing machines requiring precise X/Y axis drive, stepper-motor-driven 3D printer gantries where consistent belt tension is critical, and light-duty industrial conveyor or pick-and-place automation systems that rely on synchronous belt drives for accurate indexing.
| Belt Pitch | 3mm (3M) |
|---|---|
| Pulley Type | BF-Type (flanged) |
| Number of Teeth | 50T / 60T / 65T / 70T / 75T / 80T / 90T / 100T / 120T |
| Belt Width (Slot) | 16mm |
| Bore Diameter | 6mm, 8mm, 10mm, 12mm, 12.7mm, 14mm, 15mm, 16mm, 17mm, 19mm, 20mm, 22mm, 25mm (see variant options) |
| Keyway Options | 3×1.4mm, 4×1.8mm, 5×2.3mm, 6×2.8mm, 8×3.3mm (see variant options) |
| Material | See variant options |
| Finish / Colour | See variant options |
| Weight | See variant options |
| Compatible Belt Standard | 3M synchronous timing belt, 16mm width |
The tooth count determines the pitch diameter and, combined with your motor's tooth count, sets the drive ratio. A higher tooth count gives a larger pitch diameter and a lower mechanical advantage (faster belt speed, less torque multiplication). For most CNC and 3D printer applications, 50T–80T pulleys are common on the drive side. Match the tooth count to your belt length and center distance calculations to avoid excessive tension or slack.
Measure your motor or drive shaft diameter precisely with calipers. NEMA 17 stepper motors typically use a 5mm shaft, NEMA 23 motors commonly use 6.35mm (1/4 in) or 8mm shafts, and NEMA 34 motors often use 12mm or 14mm shafts. Select the bore that matches your shaft diameter. If your shaft has a flat or key, choose the corresponding keyway bore variant to prevent rotational slip under load.
For light-duty or low-torque applications (small 3D printers, light CNC routers), a plain bore secured with a set screw is typically sufficient. For higher-torque applications — such as larger CNC machines, servo drives, or conveyor systems — a keyway bore provides a positive mechanical connection that resists rotational slip even under shock loads. If your shaft already has a machined keyway, always use the matching keyway bore variant.
This pulley is designed to the standard 3M (3mm pitch) tooth profile, which is an industry-standard specification. It is compatible with any 3M synchronous timing belt of 16mm width from any manufacturer that conforms to the 3M pitch standard. Always verify that your belt's pitch and width match before assembling.
Confirm three parameters: (1) belt pitch — must be 3mm (3M); (2) belt width — must be 16mm; (3) bore diameter — must match your shaft. If you are replacing an existing pulley, also check the tooth count to maintain the same drive ratio. If you are designing a new system, calculate the required center distance using the tooth counts of both pulleys and the belt length.
Plain bore variants have a smooth cylindrical hole and rely on one or two set screws to clamp onto the shaft. Keyway bore variants have a machined slot (e.g., 5×2.3mm) that accepts a standard key, creating a positive interlocking connection between the shaft and pulley. Keyway variants are recommended when torque is high, direction reverses frequently, or precise angular positioning must be maintained over time.
Yes. The BF-Type 3M pulley is compatible with any motor type — stepper, servo, or DC — as long as the shaft diameter matches the selected bore and the belt pitch is 3M. Servo motor applications may benefit from keyway bore variants due to the higher torque and dynamic load reversals typical of closed-loop servo systems.
