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When a mismatched or worn 3M timing belt pulley causes belt slip, skipped teeth, or inconsistent shaft timing, the entire drive system loses accuracy. Engineers, machine builders, and DIY automation enthusiasts who need a dimensionally accurate synchronous wheel will find this 3M timing belt pulley a direct-fit solution across a wide range of shaft sizes and tooth counts.
This pulley is machined for 3M pitch (3mm tooth pitch) timing belts with a tooth width of 11mm. Available in tooth counts from 70T to 120T, with through-hole bore diameters ranging from 5mm to 25mm (approximately 0.20 in to 0.98 in). Keyway variants are also available with keyway widths from 3mm to 8mm depending on bore size, enabling positive torque transmission without set-screw slip.
Typical use cases include 3M synchronous belt drive systems in CNC router X/Y axes, 3D printer extruder and motion stages, conveyor indexing mechanisms, and light-duty robotic joint drives — anywhere repeatable positioning and low backlash are required in a 3M pitch synchronous drive.
Available from 70T to 120T (70, 72, 75, 76, 80, 90, 100, 110, 120 teeth) — select the exact count to achieve your target drive ratio without sourcing from multiple suppliers.
Engineered to mesh precisely with standard 3M timing belts. The 11mm tooth width provides a stable belt contact surface for consistent torque transfer across the full tooth count range.
Through-hole bores from 5mm to 25mm accommodate a wide range of motor and drive shaft diameters. Select the bore that matches your shaft for a secure, concentric fit.
Keyway bore options (e.g., 10mm – K 3mm, 12mm – K 4mm, 25mm – K 8mm) provide a positive mechanical coupling that resists rotational slip under sustained or shock loads.
Tooth profile and bore concentricity are held to close tolerances to minimize belt wear, vibration, and positional error in continuous-duty synchronous drive applications.
Suited for CNC machines, 3D printers, conveyor indexing systems, and light robotic drives — any application where a 3M synchronous belt drive is specified and shaft sizing falls within the available bore range.
| Belt Pitch | 3M (3mm) |
|---|---|
| Tooth Width | 11mm |
| Available Tooth Counts | 70T, 72T, 75T, 76T, 80T, 90T, 100T, 110T, 120T |
| Through-Hole Bore Diameter | 5 / 6 / 8 / 10 / 12 / 14 / 15 / 17 / 19 / 20 / 25 mm |
| Keyway Bore Options | 8mm–K3mm, 10mm–K3mm, 10mm–K4mm, 12mm–K4mm, 14mm–K5mm, 15mm–K5mm, 17mm–K5mm, 19mm–K6mm, 20mm–K6mm, 25mm–K8mm |
| Pitch Diameter Range | Approx. 66.8mm (70T) to 114.6mm (120T) |
| Outer Diameter | See variant options |
| Hub Thickness | See variant options |
| Material | Contact us to confirm |
| Compatible Belt Type | 3M closed-loop timing belt, 11mm width |
| Quantity per Order | 1 piece |
The tooth count determines your drive ratio. Divide the driven pulley tooth count by the driving pulley tooth count to get the reduction ratio. For example, a 70T driver paired with a 140T driven pulley gives a 2:1 reduction. Choose your tooth counts based on the required output speed or torque, then verify that your belt length suits the resulting center distance.
Measure your shaft diameter with a caliper and select the matching through-hole bore. For example, a 10mm shaft requires the 10mm bore variant. If your shaft has a keyway slot, select the corresponding keyway variant (e.g., 10mm – K 3mm or 10mm – K 4mm) and confirm the key width matches your shaft keyway.
A through-hole (plain bore) pulley is secured to the shaft using a set screw or press fit. A keyway bore includes a machined slot that accepts a standard parallel key, creating a positive mechanical lock between the pulley and shaft. Keyway variants are recommended for higher torque applications or where shaft slip under load is a concern.
This pulley is designed for standard 3M pitch (3mm tooth pitch) timing belts with an 11mm belt width. Confirm your belt is rated for 3M pitch and 11mm width before ordering. A belt with a different pitch or width will not mesh correctly and will cause accelerated wear or belt failure.
Pitch Diameter (PD) = (Number of Teeth × Belt Pitch) ÷ π. For a 70T pulley: PD = (70 × 3) ÷ 3.1416 ≈ 66.8mm (~2.63 in). For a 120T pulley: PD = (120 × 3) ÷ 3.1416 ≈ 114.6mm (~4.51 in). Use the pitch diameter to calculate center distance and required belt length for your drive layout.
Yes. 3M pitch pulleys are widely used in CNC router axis drives and 3D printer motion systems. Verify that your existing belt is 3M pitch and 11mm wide, and that the bore matches your stepper or servo motor shaft diameter. Keyway variants are particularly suited for CNC applications where positional accuracy under sustained load is critical.
The material specification is not confirmed in the current listing. Please contact us before ordering if your application involves elevated temperatures, moisture, chemical exposure, or specific weight requirements. We can confirm the material and advise on suitability for your environment.
