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When a slipping or mismatched pulley derails your CNC router mid-cut or causes positional drift in your robotic arm, the entire project stalls. Engineers, makers, and small-batch manufacturers who demand repeatable, zero-slip motion control need a synchronous pulley they can trust across every build. These S2M timing belt pulleys are engineered for exactly that — delivering consistent tooth engagement and reliable torque transfer in demanding motion-control applications.
Each pulley is machined from aluminum alloy with a hard-anodized or natural finish (see variant options for exact finish). The S2M tooth profile features a 2 mm pitch, and pulleys are available in belt widths of 6 mm (~0.24 in) or 10 mm (~0.39 in), with tooth counts spanning 16 T to 60 T. Bore diameters range from 4 mm to 14 mm (~0.16–0.55 in), covering the most common motor shaft sizes. Two hub styles are offered: K-type (keyway-ready, compact hub) and BF-type (flanged hub with set-screw retention for tool-free shaft locking).
Typical use cases include desktop CNC routers and laser engravers requiring S2M synchronous belt drive systems, 3D printer X/Y axis motion stages needing low-backlash S2M pulley replacements, and lightweight robotic arm joints or conveyor indexing mechanisms where a compact aluminum timing pulley with 2 mm pitch keeps weight low without sacrificing torque capacity.
Choose from 16 to 60 teeth to dial in your exact drive ratio. A broader selection means fewer compromises when designing gear ratios for CNC axes, extruder drives, or indexing tables.
The 6 mm width suits lightweight, space-constrained builds; the 10 mm width handles higher torque loads. Both share the same S2M 2 mm pitch for interchangeability within your belt inventory.
Covers the most common stepper and servo motor shaft diameters — from compact NEMA 14 shafts (5 mm) to larger NEMA 23 shafts (6.35 mm) and beyond — reducing the need for custom adapters.
K-type pulleys feature a compact, keyway-compatible hub for positive torque transmission. BF-type pulleys add a flange and set-screw for tool-free shaft retention, ideal for rapid prototyping and field adjustments.
Lightweight yet rigid aluminum alloy body keeps rotational inertia low — critical for high-acceleration CNC and robotics applications — while maintaining dimensional stability across typical operating temperatures.
Order a single pulley for a repair or prototyping run, or select a 2- or 3-piece pack for paired-axis builds and spares inventory. Pack quantity is selectable per variant so you only buy what you need.
| Belt Profile | S2M (2 mm pitch, synchronous) |
|---|---|
| Belt Width Compatibility | 6 mm or 10 mm (see variant options) |
| Tooth Count Range | 16 T – 60 T |
| Hub Style | K-type (keyway) or BF-type (flanged, set-screw) |
| Bore Diameter Range | 4 mm – 14 mm (see variant options) |
| Material | Aluminum alloy |
| Outer Diameter | See variant options |
| Hub Length | See variant options |
| Flange (BF-type) | Integrated flange with set-screw retention |
| Keyway (K-type) | Contact us to confirm keyway dimensions per bore size |
| Pack Quantity | 1, 2, or 3 pcs (see variant options) |
| Surface Finish | See variant options |
The tooth count determines your drive ratio. Divide the driven pulley teeth by the driving pulley teeth to get the ratio. For a 1:1 ratio on a CoreXY printer, use matching tooth counts on both axes. For speed reduction (more torque), use a larger driven pulley; for speed increase, use a smaller one. Common starting points for desktop CNC are 16 T or 20 T on the motor and 20 T–40 T on the driven axis.
K-type pulleys have a compact hub designed for keyway shafts, providing positive torque transmission without slipping — ideal for high-torque or reversing loads. BF-type pulleys feature an integrated flange and one or more set-screws that clamp directly onto a smooth shaft, making them easier to install and reposition without special tooling. Choose K-type for permanent, high-load installations and BF-type for prototyping or applications requiring frequent adjustments.
Yes — all pulleys in this listing use the S2M tooth profile with a 2 mm pitch. They are compatible with any standard S2M open-ended or closed-loop timing belt of the matching width (6 mm or 10 mm). Confirm your belt width before selecting a variant, as a 6 mm pulley will not properly guide a 10 mm belt.
Measure your motor or drive shaft diameter with a caliper. Common sizes: NEMA 14 steppers typically use 5 mm shafts; NEMA 17 steppers use 5 mm shafts; NEMA 23 steppers often use 6.35 mm (1/4 in) shafts; larger servo motors may use 8 mm, 10 mm, or 12 mm shafts. Select the bore that matches your shaft exactly — a loose bore causes runout and positional error. If your shaft has a flat (D-cut), the BF-type set-screw design accommodates this without a keyway.
The aluminum alloy body provides inherent corrosion resistance suitable for indoor workshop, laboratory, and light industrial environments. For high-humidity or outdoor applications, additional protective measures (such as a clear lacquer coat) are recommended. The set-screws on BF-type pulleys are typically steel; apply a small amount of anti-seize compound if corrosion is a concern.
Yes. S2M pulleys are widely used in desktop 3D printers (particularly CoreXY and Cartesian designs) and CO₂ or diode laser engravers for X/Y axis motion. The 16 T and 20 T variants are the most common motor-side pulleys in these machines. Verify your existing belt pitch is S2M (2 mm) — some printers use GT2 (also 2 mm pitch but a different tooth profile) which is not interchangeable.
For a single-axis replacement or prototype, the 1-piece pack is sufficient. For a dual-axis machine (e.g., CoreXY printer with two motor pulleys), select the 2-piece pack. The 3-piece pack is cost-effective when building multiple machines or stocking spares. Pack quantity is shown in the "Bore & Pack Quantity" variant selector.
