3M BF-Type Timing Belt Pulley 55/60T Synchronous Wheel For 10mm/15mm Width Belt

The tooth count determines your drive ratio. A 55T pulley paired with a smaller driver pulley gives a different speed/torque ratio than a 60T. If you need a specific output RPM or torque multiplication, calculate your ratio using (driven teeth ÷ driver teeth). For most desktop CNC and 3D printer gantry applications where both pulleys are the same size, either tooth count works — choose 60T for slightly smoother belt engagement at higher speeds.

Select the bore diameter that matches your motor or drive shaft. Common sizes include 5mm and 6.35mm (1/4") for small stepper motors, 8mm for NEMA 23-class motors, and 10mm–25mm for larger servo or gearbox shafts. If your shaft has a flat (D-cut), the set-screw will seat against it for extra security. Measure your shaft with calipers before ordering.

Variants listed as, for example, "8mm(3×1.4mm)" indicate a bore with a keyway slot — in this case 3mm wide × 1.4mm deep — for use with a matching key and keyway shaft. Plain bore variants (e.g., "8mm") use only the set-screw for retention. If your shaft has a machined keyway, select the matching keyed bore variant for maximum torque transmission without slippage.

Yes — this pulley is machined to the standard 3M tooth profile (3mm pitch, 1.2mm tooth height), so it is compatible with any 3M open-ended or closed-loop timing belt of the correct width. Ensure your belt width matches the variant you select: 10mm belt variants for 10mm-wide belts, and 15mm belt variants for 15mm-wide belts. Mixing belt widths and pulley widths will cause tracking issues.

The BF-type set-screw hub provides reliable retention for typical DIY and light-industrial loads. For best results, tighten the set-screw against a flat on the shaft (D-cut) or use a keyed bore variant for higher-torque applications. If your application involves frequent direction reversals or shock loads, consider applying a small amount of thread-locking compound to the set-screw after final alignment.

The corrosion resistance depends on the material and finish of the specific variant. For humid or mildly corrosive environments, we recommend selecting a variant with an anodized or coated finish if available, or applying a light machine oil after installation. For outdoor or wash-down environments, contact us to confirm the best variant for your conditions.

Yes. The 3M BF-type pulley can be used on either the driver (motor) side or the driven (load) side of a belt transmission. When used as a matched pair (same tooth count on both sides), you get a 1:1 speed ratio with synchronized motion — ideal for gantry systems. Mix tooth counts to achieve speed reduction or increase.