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When your CNC router stalls mid-cut or your 3D printer skips steps because of a mismatched pulley, the frustration is real. Hobbyists, engineers, and automation builders who need a reliable T5 timing pulley for 25mm belt applications deserve a component that fits right the first time. These aluminum AF-shape T5 timing pulleys are designed for exactly that — delivering consistent, slip-free power transmission across a wide range of motion control projects.
Each T5 timing pulley is machined from aluminum alloy in the AF (flange) profile, with tooth counts ranging from 10T to 28T and bore diameters from 5 mm (~0.20 in) to 20 mm (~0.79 in). Keyway options include without keyway, 3 mm, 4 mm, 5 mm, and 6 mm widths, allowing secure shaft locking where needed. The T5 tooth profile has a 5 mm pitch, and these pulleys are sized for 25 mm wide T5 timing belts.
Typical use cases include CNC router X/Y axis drives, desktop 3D printer extruder and motion systems, linear actuator assemblies, conveyor indexing mechanisms, and DIY robotics platforms where a T5 aluminum timing pulley with a precise bore-to-shaft fit is critical for repeatable positioning.
| Belt Type | T5 Timing Belt |
|---|---|
| Belt Width | 25 mm (~0.98 in) |
| Tooth Pitch | 5 mm |
| Number of Teeth | See variant options (10T, 12T, 14T, 15T, 16T, 17T, 18T, 19T, 20T, 22T, 24T, 25T, 26T, 28T) |
| Bore Diameter | See variant options (5–20 mm) |
| Keyway Width | See variant options (without keyway / 3 mm / 4 mm / 5 mm / 6 mm) |
| Material | Aluminum Alloy |
| Shape / Profile | AF (Flanged) |
| Outer Diameter | See variant options |
| Hub Length | See variant options |
| Finish | Natural aluminum (uncoated) |
| Quantity per Order | 1 piece |
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, use matching tooth counts on both pulleys. For CNC and 3D printer motion systems, 16T–20T is a common starting point for balanced speed and resolution.
Measure your motor or drive shaft diameter with calipers before ordering. Common motor shaft sizes include 5 mm (small stepper motors), 6.35 mm (1/4 in), 8 mm, 10 mm, and 12 mm. Select the bore that matches your shaft exactly — a loose bore will cause runout and positioning errors.
A keyway provides a mechanical lock between the pulley and shaft, preventing rotational slip under load. If your shaft has a keyway slot, match the keyway width to it (3 mm, 4 mm, 5 mm, or 6 mm). If your shaft is smooth or you plan to use a set screw only, choose "without keyway." For high-torque or reversing-load applications, a keyway is strongly recommended.
Yes. These pulleys are machined to the T5 tooth profile with a 5 mm pitch, which is the international standard for T5 timing belts. They are designed for 25 mm wide T5 belts. Using a belt of a different width or pitch (e.g., T2.5, T10, HTD 5M) will result in poor mesh and should be avoided.
AF stands for "flanged" — the pulley has raised flanges on one or both sides of the tooth face. These flanges act as belt guides, keeping the 25 mm T5 belt centered on the pulley and preventing it from walking off the edge during operation. This is especially important in open-loop systems like 3D printers and CNC routers where belt alignment is critical.
Yes. T5 aluminum timing pulleys are widely used in desktop CNC routers, laser cutters, and some 3D printer designs that use 25 mm wide T5 belts. Verify that your machine's belt width is 25 mm and that the tooth count matches your existing drive geometry before ordering.
Pulleys ordered without a keyway are typically secured using one or two set screws threaded radially into the hub. Tighten the set screw(s) firmly against the shaft using the appropriate hex key. For added security on smooth shafts, apply a small amount of thread-locking compound to the set screw before tightening.
