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HTD Timing Belts


HTD timing belts represent High Torque Drive. HTD timing belts have greater load capacity than trapezoidal belts. More contact area with the pulley improves performance for HTD belts. HTD belts are available both in neoprene and PU.

Belts in the 8M, 14M, and 20M series are engineered for high-capacity operations within the machine tool, paper, and textile sectors, prioritizing durability and minimal maintenance.

For household appliances, office equipment, power tools, and applications in processing and chemical industries, we suggest utilizing 3M and 5M pitch HTD belts.

If you require help identifying the suitable belt for your specific application, or if you’re seeking to develop a tailored power transmission solution, feel free to reach out to our team of application specialists.

Neoprene HTD Timing Belts

Single Side-Series

Double Sided-Series

PU HTD Timing Belts

Truly Endless-Series


Cord Options

Tensile cord is available in kevlar, aramid fiber, steel and carbon fiber.

Fiberglass tensile cords are commonly used.

Aramid (Kevlar) cords have greater tensile strength and stiffness than fiberglass. Kevlar cords are for high-shock applications. 

Steel cords have great tensile stiffness. Steel cords require larger-diameter pulleys, so cannot be installed tightly.

Carbon fiber cords are quite strong, so can carry high torque and power.


HTD 3M and 5M belts are used in the industries such as electric hand tools, office, food process, medical, robotics, vacuum cleaners, data storage, postage and domestic appliances.

HTD 8M, 14M and 20M belts suit machine tool, paper, textile, construction, mining, agriculture and manufacturing industries.

Advantages of HTD Belts

  • Lighter construction, smaller centrifugal loss.
  • Low installation tension leads to reduced bearing loads.
  • The tooth experiences lower unit pressure due to the increased contact area.
  • The increased cross-sectional area of the tooth results in greater shear strength.
  • Costs are reduced as a narrower belt can handle the equivalent load.
  • With teeth that are deeper in proportion, the likelihood of tooth jumping or relative position loss is minimized.


  • What is an HTD timing belt ?

HTD Timing Belts have a curvilinear tooth profile, representing a significant evolution from traditional trapezoidal-shaped belts.
The curvilinear profile enables the belts to establish a broader contact surface with the pulley, enhancing overall performance.

  • What are HTD belts made of ?

HTD belts consist of neoprene material reinforced with fiberglass cords. HTD belts provides a higher load capacity compared to timing belts with trapezoidal teeth. ZZR provides the wide variety of standard belt lengths and widths in the industry.


  • The neoprene body offers shielding from dirt, grease, oil, and moisture.
  • The unique curvilinear tooth shape enhances stress distribution and enables greater overall loading capacity.
  • The elastomeric teeth are meticulously shaped and precisely spaced to guarantee proper alignment within the pulley grooves.
  • No slipping.
  • High mechanical effectiveness.
  • Consistent speeds of operation.
  • Extended trouble-free operational lifespan
  • Ideal compatibility with HTD® profile pulleys.
  • Temperature Range: -30 C to +85 C Degree
  • Load capabilities reaching 1,000 kilowatts.
  • Offered in pitches of 3M, 5M, 8M, 14M, and 20M.
  • 14M: Static conductive according to ISO 9563
  • A 30% boost in horsepower ratings compared to conventional timing belts.
  • The nylon tooth facing ensures a resilient wear surface, extending the lifespan of the product.
  • Removes the need for lubrication and readjustment, thereby reducing maintenance and labor necessary for drives.
  • The fiberglass tensile cord delivers the necessary strength along with outstanding flexibility and exceptional resistance to elongation.