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When belt slip or misalignment is costing you accuracy on your CNC router, 3D printer, or motion-control rig, the root cause is often an undersized or poorly toleranced pulley. These 3M BF-Type timing belt drive pulleys are engineered for makers, machine builders, and automation engineers who need repeatable, slip-free power transmission without the guesswork of sourcing industrial surplus.
Each 3M timing belt drive pulley features a 3mm pitch (distance between tooth centers), a BF-Type flange profile, and a 10mm belt slot width. Tooth counts span 15T through 100T, covering a wide range of reduction ratios. The bore diameter varies by tooth count — select your variant above to confirm the bore size for your shaft. Overall pulley diameter scales proportionally with tooth count, ranging from approximately 14mm (0.55 in) for 15T up to approximately 95mm (3.74 in) for 100T.
Typical use cases include CNC router X/Y axis drives requiring 3M GT2-compatible belt systems, stepper motor pulley replacements on laser engravers and plasma tables, and custom gantry or conveyor builds where a specific tooth count is needed to hit a target linear speed or torque ratio.
BF-Type Flanged Profile — Dual-flange design keeps the belt tracking on-center under load, reducing lateral drift on long-span drives.
3mm Pitch Tooth Geometry — Matches standard 3M synchronous belts for positive, slip-free engagement across the full 15T–100T tooth range.
Wide Tooth Count Selection — 38 variants from 15T to 100T let you dial in your exact drive ratio without custom machining.
10mm Slot Width — Consistent 10mm belt slot across all variants simplifies belt sourcing and system design.
Machined Bore & Set Screw — Each pulley includes a machined bore sized to the tooth count and a set screw flat for secure shaft mounting. See variant options for bore diameter.
Broad Application Range — Suited for CNC routers, laser engravers, stepper motor drives, conveyor systems, and DIY automation projects requiring 3M belt compatibility.
| Belt Pitch | 3mm (3M) |
|---|---|
| Pulley Type | BF-Type (flanged) |
| Tooth Count Range | 15T – 100T (38 variants) |
| Belt Slot Width | 10mm |
| Pitch Diameter Range | Approx. 14mm – 95mm (0.55 in – 3.74 in) |
| Bore Diameter | See variant options |
| Material | See variant options |
| Finish | See variant options |
| Mounting | Set screw with flat |
| Compatible Belt Profile | 3M synchronous timing belt (10mm width) |
| Quantity per Order | 1 piece |
The tooth count determines your drive ratio. Divide the driven pulley teeth by the drive pulley teeth to get the reduction ratio. For example, a 20T drive pulley paired with a 40T driven pulley gives a 2:1 reduction — halving speed and doubling torque. Use a smaller tooth count on the motor shaft for speed reduction, or match tooth counts for a 1:1 direct drive.
These pulleys are designed for 3M pitch synchronous timing belts — belts with a 3mm tooth-to-tooth spacing and 10mm width. Many GT2-3M belts are dimensionally compatible, but confirm your belt's tooth profile matches the 3M standard before ordering. Standard GT2 (2mm pitch) belts are not compatible.
Bore diameter varies by tooth count. Select your specific tooth count variant on this page to see the bore size listed in the variant details. Common stepper motor shaft diameters are 5mm, 6.35mm (1/4 in), and 8mm — measure your shaft with calipers before ordering to ensure a proper fit.
These pulleys are machined to handle the torque loads typical of NEMA 17 and NEMA 23 stepper motor drives used in CNC routers, laser engravers, and similar machines. For very high-torque servo-driven systems, confirm the material specification of your selected variant and consult your system's torque requirements against the pulley's rated load capacity.
Yes. The BF-Type designation means the pulley has flanges on both sides of the belt groove. These flanges act as lateral guides, preventing the belt from walking off the pulley during operation — particularly important on long-span or high-speed drives where belt tracking can be an issue.
Corrosion resistance depends on the material and finish of the specific variant. Check the variant details for material information. For humid or outdoor environments, consider selecting an anodized aluminum or stainless variant if available, and apply a light machine oil to the bore and set screw area after installation.
Yes, provided the bore diameter matches your servo shaft and the pulley's load rating suits your servo's output torque. The 3M belt system is used in both stepper and servo-driven motion control applications. Verify shaft diameter, keyway requirements (if any), and torque load before finalizing your selection.
