Fingertech S3M Timing Pulley

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  • Regular price $5.53

Fingertech's S3M Timing Pulleys and Belts are a good solution for transmitting power from motors to wheels or shafts. 

A range of ten pulley sizes means there are 55 different ratio combinations to choose from! 
Use with our selection of Fingertech Timing Belts, or any other 3mm pitch belt (4mm wide or less). 

Fingertech's Pulley-Belt Distance Calculator will let you pick from our available pulley and belt sizes and tell you how far apart they will be, OR plug in your desired distance and it will tell you which belt to use.


  • Pitch (distance between tooth center) - 3mm
  • Belt Width (max) - 4mm
  • Material - 6061 Aluminum
  • Sizes 9t to 42t 
  • Bore 3mm (9t, 15t, & 16t can be drilled up to 5/32", larger pulleys can be drilled up to 1/4")
  • Includes 4-40 setscrew for attaching to a shaft.  Make sure your motor or shaft has a flat spot.  
  • Setscrew requires 0.05" hex wrench

# Teeth Pitch Diameter (for calculating centers) Outside Tooth Diameter Weight
9T 8.59mm (.338") 7.89mm (.313") 1.4g (0.05oz)
15T 14.32mm (.564") 13.56mm (.534") 3.3g (0.11oz)
16T 15.28mm (.602") 14.52mm (.572") 4.0g (0.13oz)
18T 17.19mm (.677") 16.43mm (.647") 5.3g (0.18oz)
22T 21.01mm (.827") 20.25mm (.797") 7.8g (0.28oz)
26T 24.83mm (.977") 24.07mm (.947") 10.5g (0.38oz)
30T 28.65mm (1.128") 27.89mm (1.098") 13.5g (0.48oz)
34T 32.47mm (1.278") 31.71mm (1.248") 16.3g (0.55oz)
38T 36.29mm (1.429") 35.53mm (1.399") 21.0g (0.73oz)
42T 40.11mm (1.579") 39.34mm (1.549") 26.3g (0.90oz)

Pulley Size Chart (mm)