5M AF-Type Timing Belt Pulley — Precision Synchronous Drive for 15mm & 20mm Belts
When your DIY automation project demands slip-free, synchronized motion, a mismatched or poorly machined pulley is the first thing that will let you down. Whether you are a maker building a CNC router, a small workshop running a conveyor, or an engineer prototyping a linear actuator, the 5M AF-Type Timing Belt Pulley gives you a reliable, drop-in synchronous drive component sized exactly for your shaft and belt width.
These pulleys are machined to the 5M tooth profile (5 mm pitch) and are available in two tooth counts — 35T and 40T — with bore diameters ranging from 6 mm (0.24 in) up to 40 mm (1.57 in), including keyed-bore variants with keyway dimensions such as 3×1.4 mm, 4×1.8 mm, 5×2.3 mm, 6×2.8 mm, and 14×3.8 mm. Belt-width compatibility covers both 15 mm and 20 mm wide 5M synchronous belts. The AF-Type flange design keeps the belt tracking true without additional guides.
Typical use cases include CNC router X/Y axis drives requiring a 5M 35T timing pulley with 8 mm bore, 3D printer extruder or gantry upgrades needing a 5M 40T synchronous wheel for 20 mm belt, and light industrial conveyor or pick-and-place systems where a keyed 5M pulley with 12 mm bore and 4×1.8 mm keyway ensures zero-slip torque transfer.
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Compatibility: Designed for 5M pitch (5 mm) synchronous timing belts. Fits 15 mm and 20 mm wide belts. Bore options from 6 mm to 40 mm — select your shaft diameter and belt width from the variant dropdowns above.
✅ Key Features of These 5M AF-Type Timing Belt Pulleys
🦷 35T & 40T Tooth Options
Choose 35 teeth for higher rotational speed or 40 teeth for increased torque multiplication — both machined to the 5M tooth profile for accurate belt engagement.
📏 Wide Bore Range
Bore diameters from 6 mm to 40 mm (0.24–1.57 in), including standard round bores and keyed bores (3×1.4 mm, 4×1.8 mm, 5×2.3 mm, 6×2.8 mm, 14×3.8 mm) to suit a broad range of motor and shaft sizes.
📐 Dual Belt-Width Support
Compatible with both 15 mm and 20 mm wide 5M synchronous belts — select the matching belt width in the variant options to ensure proper flange clearance.
🔩 AF-Type Flange Design
The AF-Type configuration includes integrated flanges on both sides of the pulley body, keeping the belt centered and preventing lateral walk during continuous operation.
⚡ Slip-Free Synchronous Drive
The positive-engagement tooth profile eliminates belt slip, making these pulleys suitable for position-critical applications such as CNC axes, 3D printer gantries, and indexing conveyors.
🔧 Broad Application Fit
Suitable for CNC routers, laser cutters, 3D printers, pick-and-place machines, light conveyor systems, and general DIY automation builds requiring a reliable 5M synchronous drive.
📐 Technical Specifications — 5M Timing Belt Pulley
| Belt Profile |
5M (5 mm pitch) |
| Tooth Count |
35T or 40T (see variant options) |
| Belt Width Compatibility |
15 mm or 20 mm (see variant options) |
| Bore Diameter |
6 mm – 40 mm (see variant options) |
| Keyway Options |
3×1.4 mm / 4×1.8 mm / 5×2.3 mm / 6×2.8 mm / 14×3.8 mm (select keyed variants) |
| Pulley Type |
AF-Type (double-flanged synchronous wheel) |
| Material |
See variant options |
| Finish / Color |
See variant options |
| Outer Diameter |
See variant options |
| Hub Length |
See variant options |
| Set Screw |
See variant options |
| Condition |
New |
❓ Frequently Asked Questions
How do I choose between 35T and 40T?
The tooth count determines your drive ratio. A 35T pulley paired with a smaller driven pulley gives you a speed increase; a 40T pulley provides more torque at the output shaft. For most CNC router and 3D printer gantry applications, 35T is common for faster travel, while 40T suits heavier-load or lower-speed conveyor drives. Match both pulleys in your system to the same 5M pitch.
Which bore size should I select for my motor shaft?
Measure your motor or drive shaft diameter precisely with calipers. Select the bore option that matches — for example, choose "8mm & 15mm" if your shaft is 8 mm and your belt is 15 mm wide. For shafts that require a keyway for positive torque transfer, select the corresponding keyed-bore variant (e.g., "8mm(4×1.8mm) & 15mm").
What is the difference between a standard round bore and a keyed bore?
A standard round bore relies on set screws to fix the pulley to the shaft — suitable for lighter loads and lower torques. A keyed bore includes a machined keyway slot that accepts a matching key inserted between the shaft and pulley, providing a positive mechanical lock that prevents rotational slip under higher torque loads. Choose keyed variants for servo motors, stepper motors with significant torque, or any application where slip would cause positioning errors.
Will this pulley fit my existing 5M timing belt?
Yes, provided your belt is a standard 5M pitch (5 mm tooth pitch). Confirm your belt width is either 15 mm or 20 mm and select the matching variant. The AF-Type flanges are sized to the selected belt width, so a 15 mm belt variant will not properly retain a 20 mm belt.
How corrosion-resistant are these pulleys?
Corrosion resistance depends on the specific material and finish of the variant you select. For environments with moisture or mild chemicals, look for variants with an anodized or coated finish. For standard indoor workshop and automation use, the machined surface provides adequate durability. Contact us to confirm the material and finish for your chosen variant if corrosion resistance is a critical requirement.
Can I use a 15mm belt variant pulley with a 20mm belt?
No. The flange spacing on the 15 mm belt variant is designed to retain a 15 mm wide belt. Using a 20 mm belt on a 15 mm flanged pulley will cause the belt to ride over the flanges and track incorrectly, leading to premature wear or belt derailment. Always match the belt width to the pulley variant.
What applications are these pulleys best suited for?
These 5M AF-Type pulleys are well suited for CNC routers, laser engravers, 3D printer gantry and extruder drives, pick-and-place automation, light conveyor indexing systems, and general DIY motion-control projects. The 5M pitch handles moderate-to-high torque loads better than smaller pitches like GT2, making it a common choice for larger-format machines and workshop automation.
🛒 Select your tooth count, bore diameter, and belt width above, then add to cart.
