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When a slipping or misaligned drive pulley derails your build mid-project, every minute of downtime costs you. Makers, engineers, and hobbyists who demand repeatable, slip-free motion need a timing pulley they can trust across long print runs, multi-axis CNC routines, and continuous robotics cycles. The XL12T AF synchronous wheel is engineered for exactly that workload.
This timing pulley features 12 teeth in the XL tooth profile and accepts a 10mm wide XL timing belt. Available bore sizes span 4mm, 5mm, 6mm, 6.35mm (1/4"), and 8mm — covering the most common motor shaft diameters from approximately 0.16" to 0.31". The AF (aluminum flange) construction provides a lightweight yet rigid hub that resists deformation under load.
Typical use cases include CNC router X/Y axis drives requiring consistent step accuracy, FDM 3D printer extruder and motion systems where belt skip causes layer shifts, and compact robotics arm joints where low backlash synchronous drive is essential for positional repeatability.
| Tooth Profile | XL (Extra Light) |
|---|---|
| Number of Teeth | 12 |
| Belt Width | 10mm (0.39") |
| Bore Diameter | 4mm / 5mm / 6mm / 6.35mm / 8mm (see variant options) |
| Hub Style | AF (Aluminum Flange) |
| Material | Aluminum alloy |
| Pitch | XL — 5.08mm (0.200") |
| Outside Diameter | See variant options |
| Flange Diameter | See variant options |
| Set Screw | Included |
| Finish | Natural anodized aluminum |
| Compatible Belt | XL-profile, 10mm width |
Measure your motor shaft diameter with a caliper. Common stepper motor shafts are 5mm or 8mm; servo motors often use 6mm or 6.35mm (1/4"). Select the bore that matches your shaft exactly — a loose fit will cause runout and positioning errors even with the set screw tightened.
This pulley is designed for XL-profile timing belts with a 10mm width and a 5.08mm (0.200") pitch. Do not use GT2 or T5 belts — the tooth profiles are not interchangeable and will cause skipping or premature wear.
Yes. The aluminum alloy construction handles the continuous torque and vibration loads typical of hobby and light-industrial CNC routers. For very high-speed spindle applications exceeding 5,000 RPM on the pulley, verify dynamic balance requirements with your system design.
Aluminum naturally forms a protective oxide layer that resists corrosion in typical indoor workshop environments. The anodized finish adds an additional barrier. Avoid prolonged exposure to saltwater or strong acids, which can degrade aluminum over time.
Yes, provided your printer uses XL-profile 10mm belts. Many CoreXY and Cartesian printers use GT2 belts — confirm your belt profile before ordering. If your printer uses XL belts on the X/Y or Z axis, this pulley is a direct fit for 12-tooth positions.
A set screw is included with each pulley. It is typically pre-installed in the hub. Use an appropriate hex key (Allen wrench) to tighten it against a flat on your motor shaft for the most secure connection. If your shaft has no flat, consider adding a small flat with a file for better grip.
6mm is the standard metric shaft size used on most metric stepper and servo motors. 6.35mm (1/4") is the imperial equivalent common on North American servo motors and some DC gear motors. Check your motor's datasheet for the exact shaft diameter — even a 0.35mm mismatch will cause wobble under load.
