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When a slipping or mismatched pulley derails your CNC router, 3D printer, or conveyor build mid-project, the cost is more than time — it's accuracy. Engineers, makers, and automation builders who rely on 3M pitch synchronous drives need a BF-type pulley that seats cleanly, holds bore tolerance, and meshes without backlash. This 3M timing belt drive pulley is engineered for exactly that demand.
Each pulley is machined from aluminum alloy with a natural anodized or silver finish, featuring a flanged BF-type body that keeps the 10mm wide belt tracking on-axis. Tooth count spans 15T through 100T, and bore options run from 3mm (0.12 in) to 25mm (0.98 in), with a fixed slot width of 11mm to accept standard set-screw retention. Outer diameter scales with tooth count — from approximately 14.3mm (0.56 in) at 15T up to approximately 95.5mm (3.76 in) at 100T.
Typical applications include desktop CNC machines requiring repeatable X/Y axis positioning, FDM 3D printer extruder and motion systems using 3M belt drives, and light-duty industrial conveyor or indexing tables where a compact flanged pulley simplifies belt alignment without additional guides.
Choose from 26 tooth counts to match your exact drive ratio — from compact 15T sprockets for high-speed axes to large 100T pulleys for torque-multiplying reduction stages.
Bore options from 3mm to 25mm (0.12–0.98 in) cover metric and fractional shafts including 3.175mm (1/8 in), 6.35mm (1/4 in), and 12.7mm (1/2 in) for mixed-standard builds.
Integrated flanges on both sides of the pulley keep the 10mm belt centered on the pulley face, reducing lateral drift without requiring external belt guides or tensioners.
The 3mm tooth pitch meshes precisely with standard 3M timing belts, delivering slip-free, synchronous motion transfer suitable for positioning and indexing applications.
A consistent 11mm slot width across all variants accommodates standard M3–M5 set screws, allowing secure shaft locking without additional machining or adapters.
Machined from aluminum alloy for a balance of low rotational inertia and structural rigidity — keeping your drive system responsive while resisting deformation under belt tension.
| Belt Pitch | 3M (3mm tooth spacing) |
|---|---|
| Belt Width Compatibility | 10mm |
| Pulley Type | BF-Type (flanged, with set-screw slot) |
| Tooth Count Range | 15T – 100T (26 options) |
| Bore Diameter Range | 3mm – 25mm (3.175 / 4 / 5 / 6 / 6.35 / 7 / 8 / 10 / 12 / 12.7 / 14 / 15 / 16 / 17 / 18 / 19 / 20 / 22 / 25mm) |
| Slot Width | 11mm |
| Material | Aluminum alloy |
| Outer Diameter | See variant options (scales with tooth count) |
| Finish | See variant options |
| Weight | See variant options |
Tooth count determines your drive ratio. Divide the driven pulley teeth by the driving pulley teeth to get the ratio. For a 1:1 ratio use matching tooth counts on both ends. For speed reduction, use a larger tooth count on the driven shaft; for speed increase, use a smaller count. Common CNC and 3D printer setups use 20T or 25T drive pulleys paired with matching idlers or larger driven pulleys.
Match the bore to your shaft diameter exactly. Available bores include 3mm, 3.175mm (1/8 in), 4mm, 5mm, 6mm, 6.35mm (1/4 in), 7mm, 8mm, 10mm, 12mm, 12.7mm (1/2 in), 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 22mm, and 25mm. If your shaft is imperial (e.g., 1/4 in or 1/2 in), select the corresponding fractional bore option. The set-screw slot secures the pulley once positioned on the shaft.
No. This pulley is designed specifically for 3M pitch synchronous timing belts with a 3mm tooth spacing. GT2 belts use a 2mm pitch and a different tooth profile, and HTD belts use a rounded tooth form. Using a mismatched belt profile will cause poor meshing, increased wear, and potential belt skipping. Always pair 3M pulleys with 3M belts.
Aluminum alloy pulleys are well-suited for light-to-medium duty synchronous drives. For 10mm wide 3M belts, typical operating tensions are within the structural limits of the alloy body. Avoid shock loads or sustained overtensioning beyond the belt manufacturer's rated working tension. For heavy industrial applications with continuous high loads, consult the belt tension specifications and consider steel-bodied alternatives.
Aluminum alloy naturally forms a thin oxide layer that provides moderate corrosion resistance in typical indoor and light-industrial environments. For humid, wet, or chemically aggressive environments, an additional anodizing treatment or protective coating is recommended. The set-screw slot area should be kept clean and dry to prevent galvanic corrosion if used with steel shafts in wet conditions.
This BF-type pulley is a toothed drive pulley intended to mesh with the belt teeth and transmit torque from a shaft. It is not a smooth idler. If you need a smooth-face idler to tension or redirect the belt without engaging the teeth, you will need a separate smooth idler pulley. Using a toothed pulley as an idler on the back face of the belt will cause belt wear and noise.
BF-type pulleys include flanges on both sides of the pulley body, which physically constrain the belt from walking off the pulley laterally. B-type pulleys have no flanges and rely on system alignment to keep the belt on track. BF-type is recommended for applications where precise belt tracking is critical or where the drive system cannot be perfectly aligned, such as in compact CNC or 3D printer builds.
