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When your CNC router skips steps or your conveyor drive slips under load, the culprit is often a mismatched or worn pulley. Engineers, makers, and small-batch manufacturers who need repeatable, slip-free linear motion rely on T5 timing belt pulleys to keep every axis locked in sync. These pulleys are designed for the T5 belt standard and are compatible with the widest range of motion-control setups on the market.
Each pulley is machined from aluminum alloy with a natural silver finish. The tooth profile follows the T5 standard: 5mm pitch (0.197 in) and 27mm (1.06 in) tooth width. Tooth counts span 10T through 60T, and bore diameters range from 5mm to 24mm (0.197–0.945 in), covering the most common motor shaft sizes used in stepper and servo drive systems.
Typical use cases include open-loop CNC router X/Y axes, 3D printer extruder and gantry drives, pick-and-place automation arms, and light-duty conveyor indexing systems. Long-tail applications such as "T5 pulley for NEMA 17 stepper" and "aluminum timing pulley 5mm pitch 27mm width" are fully covered by this range.
Twenty-two tooth-count options let you dial in the exact gear ratio your drive system needs — from fast, low-torque 10T sprockets to high-torque 60T pulleys for slow, powerful feeds.
Conforms to the T5 belt standard. The 27mm (1.06 in) tooth width provides a generous belt contact surface, reducing tooth load and extending belt life in continuous-duty applications.
Bore sizes from 5mm to 24mm (including 6mm, 6.35mm, 8mm, 10mm, 12mm, 12.7mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, and 24mm) accommodate the most common stepper and servo motor shaft diameters without custom machining.
Lightweight aluminum alloy body keeps rotating inertia low — critical for high-acceleration CNC and robotics axes — while providing sufficient rigidity for continuous belt tension loads.
The positive-engagement tooth profile eliminates belt slip entirely, ensuring that every motor step translates directly to linear or rotary output — essential for open-loop CNC positioning.
Standard T5 tooth profile and flange dimensions make these pulleys interchangeable with other T5-spec components, simplifying maintenance and spare-parts stocking for multi-machine shops.
| Belt Standard | T5 |
|---|---|
| Pitch | 5mm (0.197 in) |
| Tooth Width | 27mm (1.06 in) |
| Tooth Count (Gears) | 10T, 12T, 14T, 15T, 16T, 17T, 18T, 19T, 20T, 22T, 24T, 25T, 26T, 28T, 30T, 32T, 34T, 36T, 38T, 40T, 50T, 60T |
| Bore Diameter | 5mm, 6mm, 6.35mm, 8mm, 10mm, 12mm, 12.7mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 24mm |
| Material | Aluminum alloy |
| Finish | Natural aluminum (silver) |
| Flange | See variant options |
| Hub Length | See variant options |
| Set Screw | See variant options |
| Compatible Belt Width | Up to 27mm |
| Quantity per Order | 1 Pcs |
The tooth count determines your drive ratio. Pair a small driver pulley (e.g., 10T–20T) on the motor shaft with a larger driven pulley to reduce speed and multiply torque, or use equal tooth counts for a 1:1 ratio. For CNC routers and 3D printers, 20T is a common starting point on NEMA 17 motors with GT2/T5 belts. Calculate your steps-per-mm based on the tooth count and belt pitch to confirm positioning accuracy before finalizing your selection.
Standard NEMA 17 stepper motors have a 5mm output shaft. Select the 5mm bore variant. NEMA 23 motors typically use an 8mm or 6.35mm (1/4 in) shaft — choose accordingly. Always measure your motor shaft diameter with calipers before ordering, as some motors deviate from the nominal size.
Yes. These pulleys conform to the standard T5 tooth profile (5mm pitch, trapezoidal tooth form) and will mesh correctly with any T5-specification timing belt up to 27mm wide. They are not compatible with GT2, HTD, or other belt profiles, even if the pitch appears similar. Confirm your belt is labeled T5 before purchasing.
Aluminum alloy pulleys are well-suited for light-to-medium duty automation, CNC routing, and 3D printing where belt tensions are typically under 200 N. For heavy industrial conveyors or high-shock loads, consider steel pulleys. In typical maker and small-machine applications, aluminum provides an excellent balance of low inertia and adequate strength for long service life.
The natural aluminum finish offers moderate corrosion resistance suitable for indoor workshop and light industrial environments. For humid, wet, or outdoor installations, we recommend applying a thin coat of dry lubricant or anodizing the pulley surface. Avoid prolonged exposure to salt spray or strong acids without additional surface protection.
Yes. You can use any two pulleys from this range together — for example, a 20T driver on the motor and a 40T driven pulley on the output shaft to achieve a 2:1 reduction. Just ensure both pulleys share the same T5 belt standard and that your belt width does not exceed 27mm. Order the appropriate bore size for each shaft in your system.
6mm is a metric bore size common on European and Asian motor shafts. 6.35mm (1/4 inch) is the imperial equivalent used on many North American motors and gearboxes. They are not interchangeable — using the wrong bore will result in a loose fit or inability to mount the pulley. Measure your shaft diameter precisely before selecting.
