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When your motion system demands repeatable, slip-free power transfer, a worn or mismatched pulley becomes the weakest link in the chain. Engineers, makers, and repair technicians working on 3D printers, CNC routers, laser cutters, and robotic arms rely on S2M 6mm timing belt pulleys to restore or upgrade their drive trains without guesswork.
These S2M 6mm timing belt pulleys are machined from aluminum alloy with an anodized finish, available in tooth counts from 16T to 60T and bore diameters from 4mm to 14mm (approximately 0.16 in to 0.55 in). Two hub styles are offered: K-type (standard hub) and BF-type (flanged hub with set-screw collar), with belt width compatibility fixed at 6mm (0.24 in). Packs are available in quantities of 1, 2, or 5 pieces per order.
Typical use cases include replacing worn drive pulleys on FDM 3D printer X/Y axes, building custom S2M belt-driven CNC gantries, and assembling compact robotic joint actuators where a low-profile synchronous wheel with a precise bore fit is required.
Fourteen tooth-count options from 16 to 60 teeth let you dial in the exact gear ratio your drive system needs without custom machining.
Bore sizes from 4mm to 14mm (including 6.35mm / 1/4 in) accommodate metric and imperial shafts found in most hobby and light-industrial equipment.
K-type offers a compact straight hub; BF-type adds a flange and set-screw collar for positive axial retention on smooth shafts.
Lightweight anodized aluminum reduces rotational inertia compared to steel alternatives, improving acceleration response in high-cycle applications.
The S2M tooth profile delivers smooth, low-noise engagement with standard 2mm-pitch belts, maintaining positional accuracy across the full speed range.
Order a single replacement piece, a matched pair for dual-axis builds, or a 5-pack for workshop stock — all at consistent per-unit pricing.
| Belt Profile | S2M (2mm pitch, synchronous) |
|---|---|
| Belt Width | 6mm (0.24 in) |
| Tooth Count | 16T, 20T, 24T, 25T, 30T, 32T, 35T, 36T, 38T, 40T, 45T, 48T, 50T, 60T |
| Hub Style | K-type / BF-type (see variant options) |
| Bore Diameter | 4mm, 5mm, 6mm, 6.35mm, 7mm, 8mm, 10mm, 12mm, 14mm |
| Outer Diameter | See variant options |
| Material | Aluminum alloy (anodized) |
| Pitch Diameter | See variant options |
| Pack Quantity | 1 pc / 2 pcs / 5 pcs (see variant options) |
| Finish | Anodized (silver/natural) |
| Application | 3D printers, CNC routers, laser cutters, robotics, automation |
The tooth count determines the pitch diameter and, combined with the tooth count on the mating pulley, sets your drive ratio. For 3D printer axes, 16T–20T pulleys are most common for compact, high-resolution motion. Larger tooth counts (30T–60T) are used where higher belt speed or torque reduction is needed. Match the tooth count to your existing belt loop length and motor shaft specification.
K-type pulleys have a standard straight hub that relies on a keyway or press fit for shaft retention. BF-type pulleys include a flange on one side and a set-screw collar, making them easier to install and reposition on smooth shafts without a keyway. BF-type is generally preferred for DIY and repair applications where quick adjustment is needed.
Yes — these pulleys are designed for standard S2M (2mm pitch) timing belts with a 6mm width. Confirm that your belt is labeled S2M or 2GT/2M with 6mm width. The tooth profile is compatible with all standard S2M open and closed-loop belts.
Measure your motor or drive shaft diameter with a caliper. Available bores are 4mm, 5mm, 6mm, 6.35mm (1/4 in), 7mm, 8mm, 10mm, 12mm, and 14mm. For a secure fit, the bore should match the shaft diameter exactly. If your shaft is imperial (e.g., 1/4 in = 6.35mm), select the 6.35mm bore option.
The aluminum alloy body is anodized, which provides a hard oxide layer that resists light corrosion and surface wear. They are suitable for indoor environments and light-duty outdoor use. For harsh chemical or high-humidity environments, consider applying a light protective coating after installation.
Yes. S2M 6mm pulleys are widely used in FDM 3D printers for X and Y axis motion. The 16T and 20T variants are the most common replacements for Cartesian-style printers. Verify your printer's belt pitch (S2M = 2mm) and motor shaft diameter before selecting a variant. The 5mm bore K-type is a frequent match for NEMA 17 stepper motor shafts.
Order a 1-pack for a single replacement. A 2-pack is ideal for dual-axis machines (e.g., CoreXY printers) where both X and Y pulleys need to be replaced simultaneously. A 5-pack suits workshop stock, classroom kits, or multi-machine maintenance schedules and offers the best per-unit value.
