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Engineers and makers building CNC machines, robotic arms, or automated conveyor systems know the frustration of mismatched pulleys that slip, wear unevenly, or require constant re-tensioning. These 3M timing belt pulleys in AF-Type configuration are designed for synchronous drive applications where positional accuracy and repeatable torque transfer are non-negotiable.
Each pulley is machined to accept 3M pitch timing belts (3mm tooth pitch) with a fixed belt width of 15mm (0.59 in). Tooth counts span 12T through 28T, and bore diameters range from 4mm to 15mm (0.16–0.59 in), including fractional sizes such as 6.35mm (1/4 in) and 12.7mm (1/2 in) for compatibility with both metric and imperial shafts. The AF-Type flange configuration retains the belt laterally without additional guides.
Typical use cases include 3D printer X/Y axis drives requiring low-backlash 3M pulley sets, desktop CNC router spindle-feed synchronization with 15mm belt width pulleys, and lightweight robotic joint actuators using AF-type flanged timing pulleys for compact shaft-to-belt coupling.
Integrated flanges on both sides of the pulley body keep the 15mm timing belt centered on the pulley without requiring external belt guides or retaining clips.
Available in 12T, 15T, 16T, 18T, 20T, 24T, 25T, and 28T configurations, enabling a broad range of drive ratios for speed reduction or torque multiplication in synchronous belt systems.
Bore options from 4mm to 15mm — including 6.35mm (1/4") and 12.7mm (1/2") — accommodate both metric and imperial shaft standards, reducing the need for adapters or custom machining.
The 3mm tooth pitch profile provides positive, slip-free engagement with standard 3M timing belts, maintaining phase accuracy in stepper-driven and servo-driven motion systems.
The pulley body is sized for space-constrained assemblies typical of desktop CNC, 3D printers, and small robotic platforms, where minimizing rotating mass improves dynamic response.
Standard 3M AF-type dimensional envelope ensures compatibility with existing pulley mounts and belt runs, simplifying maintenance replacements without redesigning the drive system.
| Belt Pitch | 3M (3mm tooth pitch) |
|---|---|
| Belt Width | 15mm (0.59 in) |
| Pulley Type | AF-Type (flanged both sides) |
| Number of Teeth | 12T / 15T / 16T / 18T / 20T / 24T / 25T / 28T (see variant options) |
| Bore Diameter | 4mm / 5mm / 6mm / 6.35mm / 7mm / 8mm / 10mm / 12mm / 12.7mm / 14mm / 15mm (see variant options) |
| Keyway | See variant options |
| Material | See variant options |
| Finish | See variant options |
| Set Screw | See variant options |
| Outside Diameter | See variant options |
The tooth count determines your drive ratio. Divide the driven pulley tooth count by the driving pulley tooth count to get the speed reduction ratio. For example, a 12T driver paired with a 24T driven pulley gives a 2:1 reduction (half speed, double torque). Select tooth counts based on your required output speed and torque, then verify the resulting belt length fits your center distance.
Match the bore diameter to your shaft's outer diameter. Available bores include standard metric sizes (4, 5, 6, 7, 8, 10, 12, 14, 15mm) and common imperial equivalents (6.35mm = 1/4", 12.7mm = 1/2"). If your shaft uses a keyway, confirm the bore variant includes a matching keyway slot. When in doubt, contact us to confirm before ordering.
Yes — these pulleys are designed for standard 3M pitch timing belts (3mm tooth pitch) with a 15mm belt width. They are not compatible with other pitches such as 2M, 5M, or HTD profiles. Always verify both the pitch and belt width match before pairing with an existing belt.
AF-Type means the pulley has flanges on both sides of the toothed section. These flanges prevent the timing belt from walking off the pulley laterally during operation, which is especially important in high-speed or vertically oriented drive systems. This eliminates the need for separate belt guide rollers in most standard installations.
Yes. These 3M AF-type pulleys are widely used in desktop CNC routers, 3D printer X/Y axis drives, laser cutters, and similar motion systems. The 3M pitch provides a good balance of tooth strength and resolution for stepper-motor-driven axes. Confirm your existing belt pitch is 3M and belt width is 15mm before ordering.
Load capacity depends on the specific material and tooth count variant. Higher tooth counts distribute belt tension across more teeth, reducing per-tooth stress. For exact load ratings or material specifications for your application, please contact us to confirm the appropriate variant for your torque and speed requirements.
Shaft retention method varies by variant. Some bore options include a set screw for smooth shafts; others may include a keyway slot for keyed shafts. Check the variant description or contact us to confirm the retention method for your selected bore size before purchasing.
