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Belt type H timing belts

12.7mm (0.500″) pitch · Trapezoidal teeth · Imperial sizes

H timing belts have a 12.7mm (0.500″) pitch and the classic trapezoidal tooth. You’ll find them on industrial machinery, compressors, conveyors, woodworking and textile machines, and on plenty of older and American-built machinery. They give a positive, slip-free drive with no stretch, so timing and speed stay exact. Search by the code on the old belt, such as 450H100, and use the filters to narrow it down by length or width.

  • Pitch12.7mm (0.500″)
  • ToothTrapezoidal, imperial
  • Example450H100
  • Teeth90 on a 45.0″ belt
  • Widths075 to 300 width codes

Finding the right H belt

Reading the code450H100 is a 45.0″ pitch length belt (the first number is the length in tenths of an inch), H pitch, 1″ wide. The last three digits are the width in hundredths of an inch. Common widths are 075 (3/4″), 100 (1″), 150 (1-1/2″), 200 (2″) and 300 (3″).

Counting teethPitch length divided by the pitch gives the tooth count. A 45.0″ H belt has 90 teeth. If the code has worn off, counting the teeth is the most reliable way to get the length.

H or 8M?H is the workhorse imperial section. On new or redesigned drives, an 8M HTD belt carries more load in the same width, but it needs 8M pulleys, so replace like for like on an existing drive.

Tip: For the drive, we stock matching H timing pulleys and imperial taper lock bushes. For serpentine drives, see DH double-sided belts. 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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