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Belt type 3M HTD timing belts & RPP3

3mm pitch · Round HTD teeth · Metric sizes

3M timing belts are HTD (High Torque Drive) belts with a 3mm pitch and rounded teeth, which carry more load and run more quietly than the older trapezoidal designs. RPP3 is Megadyne’s parabolic-tooth version and runs in the same pulleys. You’ll find 3M belts on small power tools, printers, sewing machines and light automation. Search by the code on the old belt, such as 3M-300-9, and use the filters to narrow it down by length or width.

  • Pitch3mm
  • ToothRound HTD profile
  • Example3M-300-9
  • Teeth100 on a 300mm belt
  • WidthsCommonly 6, 9 and 15mm

Finding the right 3M belt

Reading the code3M-300-9 is a 3M belt with a 300mm pitch length and a 9mm width. Some brands write it the other way round, such as 300-3M-9 or 9-3M-300, but the numbers mean the same thing.

Counting teethPitch length divided by 3mm gives the tooth count, so a 300mm 3M belt has 100 teeth. If the code has worn off, count the teeth and multiply by 3 for the length.

HTD or Supertorque?Supertorque S3M belts have the same 3mm pitch but a different tooth shape. They need their own pulleys, so check the tooth profile before swapping.

Tip: For the drive, we stock matching 3M timing pulleys and metric taper lock bushes. Note: belts cut to width or length to order can’t be returned unless faulty, so check the pitch, length and width before ordering.
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