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When your CNC router, 3D printer, or automation rig demands slip-free, repeatable motion, a mismatched or worn pulley becomes the weakest link in your drivetrain. These S2M 6mm timing belt drive pulleys are engineered for makers, robotics builders, and small-machine designers who need a reliable, dimensionally consistent component they can order and install with confidence.
Each pulley is machined from aluminum alloy with a 2mm pitch S2M tooth profile and a 6mm (0.236 in) belt width. The tooth count ranges from 28 to 120 teeth, and bore options span 4–20mm (0.157–0.787 in), including fractional sizes such as 6.35mm (1/4 in) and 12.7mm (1/2 in) to accommodate both metric and imperial shafts. A single set-screw bore is standard across all variants.
Typical applications include open-loop stepper-driven CNC axes, lightweight robotic arm joints, desktop laser engravers, and custom conveyor indexing systems — anywhere a 2mm-pitch synchronous belt is already specified or where compact pulley diameter is a design constraint.
Matches standard S2M synchronous belts for zero-slip, backlash-minimized power transmission in positioning and indexing applications.
Available from 28 to 120 teeth, letting you dial in the exact gear ratio and pitch diameter your drive system requires without custom machining.
Covers metric shafts from 4mm to 20mm plus fractional sizes (6.35mm / 12.7mm), making these pulleys compatible with both metric and imperial motor shafts.
The 7mm tooth width accommodates standard 6mm S2M belts. A single set-screw bore provides secure shaft locking without requiring keyways or press-fit tooling.
Lightweight yet rigid aluminum alloy body keeps rotational inertia low — an important factor in high-acceleration stepper and servo applications.
Each variant ships as one pulley. Order the exact quantity you need for your build without being forced into multi-pack minimums.
| Belt Profile | S2M (2mm pitch) |
|---|---|
| Belt Width Compatibility | 6mm |
| Tooth Width | 7mm |
| Number of Teeth | 28 / 30 / 32 / 34 / 35 / 36 / 38 / 40 / 42 / 44 / 45 / 46 / 48 / 50 / 52 / 54 / 56 / 58 / 60 / 62 / 64 / 65 / 66 / 68 / 70 / 72 / 74 / 75 / 76 / 78 / 80 / 90 / 100 / 110 / 120 |
| Bore Diameter | 4 / 5 / 6 / 6.35 / 8 / 10 / 12 / 12.7 / 14 / 15 / 16 / 17 / 18 / 19 / 20 / 25mm (availability varies by tooth count) |
| Bore Retention | Single set-screw |
| Material | Aluminum alloy |
| Pitch Diameter (approx.) | See variant options (calculated as Teeth × 2mm / π) |
| Flange | See variant options |
| Quantity per Order | 1 piece |
The tooth count determines the pulley's pitch diameter (PD = Teeth × Pitch / π). For a 2mm-pitch S2M pulley, a 20-tooth pulley has a PD of roughly 12.7mm and a 60-tooth pulley has a PD of roughly 38.2mm. Choose your tooth counts based on the speed ratio you need between driver and driven pulleys, and verify that the resulting belt length fits your center distance.
Measure your motor or drive shaft diameter precisely with calipers before ordering. Common stepper motor shaft sizes are 5mm and 6.35mm (1/4 in); servo motors often use 6mm, 8mm, or larger. The set-screw bore requires the bore to match the shaft closely — a bore that is too large will not clamp securely. If your shaft is imperial (e.g., 1/4 in or 1/2 in), select the 6.35mm or 12.7mm bore option respectively.
No. This pulley uses the S2M tooth profile with a 2mm pitch. While GT2 belts also have a 2mm pitch, the tooth geometry differs and mixing profiles causes accelerated wear and potential skipping under load. Always pair S2M pulleys with S2M belts. HTD belts use a different pitch and are not compatible.
The single set-screw provides adequate retention for the torque levels typical of small CNC, 3D printing, and light robotics applications. For higher-torque or high-vibration environments, consider applying a thread-locking compound to the set-screw and ensuring the shaft has a flat or keyway for the screw to bear against. If your application demands keyed retention, contact us to confirm availability.
The aluminum alloy body offers good natural corrosion resistance suitable for indoor workshop, laboratory, and light industrial environments. For humid or outdoor environments, consider applying a light coat of machine oil or clear lacquer. These pulleys are not rated for immersion or highly corrosive chemical exposure.
The maximum bore diameter is physically limited by the pulley's hub diameter, which increases with tooth count. Smaller pulleys (e.g., 28–32 teeth) have a smaller hub and therefore support only smaller bores (typically up to 8mm), while larger pulleys (e.g., 60–120 teeth) can accommodate bores up to 20mm or 25mm. Check the variant selector for the exact bore options available for your chosen tooth count.
Yes. S2M pulleys are widely used in desktop 3D printers, laser engravers, and pen plotters where a 2mm-pitch belt is specified. Verify that your machine's belt is S2M (not GT2) and that the bore matches your motor shaft. The 6mm belt width is a common standard for these machines.
