Pulleys and Belts – SIT TOP DRIVE® HTD

SIT TOP DRIVE® HTD belt is an evolution of standard positive drive belts. The tooth shape is the HTD profile according to ISO 13050. This profile has been used for many years in a wide range of applications and it is well known for its outstanding performances. Power transmission is much higher compared to the classic inch trapezoidal profile.

The circular-arc tooth profile provides superior tooth jump resistance and provides a smooth tooth engagement. The noise level is remarkably reduced if compared to the classic trapezoidal belts. For each pitch a wide range of lengths and widths is available.

Belt characteristics

  • HTD Profile
  • Pitch: 3M, 5M, 8M, 14M
  • Dual pitch: D5M, D8M, D14M
  • Compound: Polychloroprene
  • Tensile members: Fiberglass
  • Belt facing: Nylon
  • Temperature: -20/+100 °C
  • Available TOP DRIVE® HTD timing belts in open end version with relative clamping plates.


  • Good quality/price ratio
  • Wide range of lengths and widths
  • Maintenance-free
  • High efficiency


Available with standard HTD pulleys in aluminum, cast iron or steel, with solid hub, for mounting SER-SIT® taper bushing or according to customer specifications.

Wide range of HTD timing bars available on stock.

Contact us for more information