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When a slipping or misaligned pulley causes your motion system to stutter mid-run, the cost is more than downtime — it's lost precision you can't easily recover. Engineers, robotics builders, and CNC hobbyists who demand repeatable, backlash-free power transmission need a 3M timing belt pulley they can trust across every cycle. This AF-type synchronous wheel is engineered for that exact demand.
Each pulley is machined from aluminum alloy with an anodized finish, offering a balance of low rotational inertia and structural rigidity. The tooth profile conforms to the 3M pitch standard (3mm pitch, ~0.118 in), and the bore range spans 4mm to 20mm (~0.157–0.787 in) to accommodate a wide variety of motor and shaft diameters. The fixed belt width is 16mm (~0.630 in), and tooth counts range from 12T to 36T to suit different speed-ratio requirements.
Typical use cases include 3D printer X/Y axis drives requiring low-backlash 3M belt pulleys, desktop CNC router spindle synchronization with AF-type timing wheels, and lightweight robotic arm joints where aluminum synchronous pulleys reduce moving mass without sacrificing torque transfer accuracy.
Double-flange (AF) construction keeps the 3M timing belt centered on the pulley face, reducing lateral drift and edge wear during continuous operation.
Choose from 12 to 36 teeth to dial in your exact speed ratio. Smaller tooth counts increase output speed; larger counts increase torque — giving you full control over your drive geometry.
Standard round bores from 4mm to 20mm, plus keyed bore options (e.g., 8mm 3×1.4mm, 10mm 4×1.8mm, 12mm 5×2.3mm) for positive shaft locking without set-screw slip.
Lightweight aluminum body minimizes rotational inertia for faster acceleration and deceleration cycles — critical in servo-driven and stepper-driven positioning systems.
Standardized 16mm (~0.630 in) belt seat width ensures direct compatibility with 3M-16 timing belts available from most industrial and hobby suppliers.
Precision-cut 3mm pitch teeth mesh cleanly with 3M belts, delivering consistent tooth engagement, low noise, and repeatable positioning accuracy across thousands of cycles.
| Belt Pitch | 3M (3mm / ~0.118 in) |
|---|---|
| Pulley Type | AF Type (Double Flange) |
| Number of Teeth | 12T, 15T, 16T, 18T, 20T, 24T, 25T, 28T, 30T, 32T, 35T, 36T |
| Belt Width | 16mm (~0.630 in) |
| Bore Diameter | 4mm – 20mm (see variant options; keyed bores available) |
| Keyway Options | 3×1.4mm, 4×1.8mm, 5×2.3mm (see variant options) |
| Material | Aluminum Alloy |
| Surface Finish | Anodized |
| Outer Diameter | See variant options (varies by tooth count) |
| Hub Length | See variant options |
| Compatible Belt | 3M Open-End / Closed-Loop Timing Belt, 16mm Width |
| Set Screw | Contact us to confirm (included on select bore sizes) |
Tooth count determines your speed ratio. Divide the driven pulley teeth by the drive pulley teeth to get the ratio. For example, a 12T drive paired with a 36T driven pulley gives a 3:1 reduction — tripling torque while reducing speed by two-thirds. For 3D printers and CNC routers, matched tooth counts (1:1) are common on X/Y axes for direct, equal-speed motion.
Plain bore variants (e.g., 4mm, 5mm, 6mm) rely on a set screw to lock the pulley to the shaft. Keyed bore variants (e.g., 8mm 3×1.4mm, 10mm 4×1.8mm) include a machined keyway slot that mates with a key on the shaft, providing a positive mechanical lock that prevents rotational slip under higher torque loads. Choose keyed bores for servo motors or applications with frequent direction reversals.
This pulley is compatible with any standard 3M pitch (3mm tooth pitch) timing belt with a 16mm width, regardless of brand. The 3M profile is an industry-standard tooth geometry, so it will mesh correctly with 3M-16 open-end belts and closed-loop 3M belts from common suppliers. Always verify the belt width matches the 16mm pulley seat.
The anodized aluminum surface provides moderate corrosion resistance suitable for indoor and light-duty environments. For prolonged exposure to moisture, salt air, or chemical environments, consider applying a light machine oil or protective coating. For highly corrosive environments, a stainless steel pulley may be more appropriate.
Exact RPM and torque ratings depend on the specific tooth count, bore size, belt tension, and operating temperature. As a general guideline, aluminum 3M pulleys in this size range are suitable for light-to-medium duty applications up to several thousand RPM. For precise load calculations, contact us with your application details and we can advise on suitability.
Plain bore variants with a set screw can be used with D-cut (flat) stepper motor shafts — position the set screw against the flat for a secure grip. Keyed bore variants are not designed for D-cut shafts. If your stepper motor has a standard round shaft, either bore type works; if it has a D-cut, select a plain bore with set screw and match the bore diameter to your motor shaft diameter.
Measure three key dimensions: (1) the bore diameter — the inner hole that fits your shaft; (2) the outer diameter or tooth count — count the teeth on your existing pulley or measure the pitch diameter; (3) the belt width — measure the width of your current belt. Match all three to the variant options above. If you are unsure, contact us with photos and measurements for assistance.
