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When a slipping or misaligned pulley derails your build mid-project, the frustration is real — especially for engineers, makers, and CNC hobbyists who depend on consistent torque transfer. These 5M AF-type timing pulleys are designed for anyone running 5M pitch belt drives who needs a reliable, dimensionally accurate pulley that fits without modification.
Each pulley is machined from aluminum alloy with an anodized finish, featuring an AF (with flange) profile to keep the belt tracking true. Tooth counts range from 10T to 18T, bore sizes span 5mm to 14mm (including 5mm, 6mm, 6.35mm, 7mm, 8mm, 10mm, 12mm, and 14mm), and the pulley body is sized for 10mm wide 5M synchronous belts. Overall outer diameter varies by tooth count — typically 16mm to 29mm (~0.63–1.14 in).
Typical use cases include desktop CNC router X/Y axis drives, 3D printer extruder and motion systems requiring 5M belt compatibility, and small-scale automation or robotics projects where a compact AF-flange pulley prevents belt walk on open-frame drives.
| Belt Pitch | 5M (5mm pitch) |
|---|---|
| Tooth Count (T) | 10T, 12T, 14T, 15T, 16T, 18T |
| Bore Diameter | 5mm / 6mm / 6.35mm / 7mm / 8mm / 10mm / 12mm / 14mm |
| Compatible Belt Width | 10mm |
| Pulley Type | AF (with flange, both sides) |
| Material | Aluminum alloy |
| Outer Diameter | See variant options |
| Hub Length | See variant options |
| Retention | Set screw(s) |
| Finish | Anodized |
| Quantity per Order | 1 / 2 / 3 / 4 / 5 pcs (select above) |
The tooth count determines your drive ratio. Divide the driven pulley teeth by the driving pulley teeth to get the ratio. For example, a 10T drive pulley paired with an 18T driven pulley gives a 1.8:1 reduction. Lower tooth counts produce higher speed; higher tooth counts produce more torque at lower speed. Match your motor RPM and required output speed to select the correct combination.
"AF" stands for "with flange" — the pulley has raised flanges on both sides of the tooth section. These flanges act as guides that keep the belt from sliding off laterally during operation, which is especially important on open-frame or lightly tensioned drives such as those found in desktop CNC machines and 3D printers.
Measure your motor or drive shaft diameter precisely with a caliper. Select the bore that matches exactly — for example, choose 6.35mm for a 1/4-inch (0.250 in) shaft, or 8mm for an 8mm metric shaft. The set screw secures the pulley on the shaft, so a close fit is important for concentricity and minimal runout.
Yes. These pulleys are machined to the 5M synchronous belt standard with a 5mm pitch tooth profile. They are compatible with any 5M open-ended or closed-loop belt that is 10mm wide. Confirm your belt is labeled "5M" or "HTD 5M" — do not use with 3M, 8M, or T5 belts, as the tooth profiles are not interchangeable.
Aluminum alloy pulleys are well-suited for light-to-medium duty applications such as 3D printers, desktop CNC routers, and small automation systems. For continuous high-torque or high-speed industrial applications, verify that the pulley's rated load capacity meets your system requirements. The anodized finish provides surface hardness and corrosion resistance for typical indoor use.
The anodized aluminum finish provides a protective oxide layer that resists corrosion in normal indoor environments. For outdoor or high-humidity applications, additional protective measures may be advisable. The set screw is typically stainless steel or zinc-plated to resist rust in the bore area.
Yes — 5M AF timing pulleys are commonly used in desktop CNC router axis drives and some larger-format 3D printer motion systems that use 5M belts. Verify that your machine's belt pitch is 5M (5mm) and belt width is 10mm, and that the bore matches your stepper motor shaft diameter (commonly 5mm or 6.35mm for NEMA 17/23 motors).
Order a single piece if you need a replacement or are prototyping a single axis. Order 2 or more if you are building a system with multiple identical axes (e.g., a dual-motor gantry), want spares on hand, or are building multiple machines. Multi-pack options offer a lower per-unit cost compared to ordering individually.
