htd idler pulley

HTD Idler Pulley

HTD Idler Pulley

Introduction to HTD Idler Pulleys

HTD idler pulleys are essential components in the mechanical world. They are used to change the direction of the belt, or to provide tension to the belt, thus ensuring smooth operation of machinery.

What is an HTD Pulley?

HTD pulley

Highly Synchronous Design

HTD (High Torque Drive) pulleys are designed to mesh precisely with HTD belts, providing high torque transmission with minimal slippage. This synchronous design ensures efficient power transfer.

Curvilinear Tooth Profile

The HTD pulley features a curvilinear tooth profile which reduces stress concentration, thereby enhancing the lifespan of the belt and pulley by distributing forces more evenly across the teeth.

Versatility in Applications

HTD pulleys can be used in various applications including automotive engines, industrial machinery, and robotics. Their capability to maintain precise timing makes them indispensable in these sectors.

Material Durability

HTD pulleys are often made from high-strength materials like aluminum, steel, or plastic composites. This ensures they can withstand the rigors of high-torque environments without degrading.

What is the Minimum Pulley Size for HTD 5M?

HTD pulley

Tooth Pitch

The HTD 5M pulley has a tooth pitch of 5 millimeters. This means the distance from one tooth to the next is 5mm, crucial for maintaining synchronization in high-torque applications.

Minimum Diameter

The minimum pulley size for an HTD 5M belt is typically around 15 teeth, which corresponds to a pitch diameter of approximately 23.9mm. This ensures the belt wraps around the pulley without excessive bending, which could cause premature wear.

Load Capacity Considerations

Choosing a pulley size also requires considering the load. Smaller pulleys can carry lighter loads, while larger pulleys are better suited for heavier applications.

What is the Difference Between GT and HTD Belts?

Tooth Profile

GT (Gates Tooth) belts have a modified curvilinear tooth profile designed to provide greater load-carrying capacity and reduced backlash compared to HTD belts.

Load Distribution

While HTD belts distribute the load evenly across the teeth, GT belts have an improved tooth shape that enhances load distribution, reducing the likelihood of tooth shear.


GT belts are often used in applications where precise motion control and high load capacity are critical, whereas HTD belts are commonly used in high-torque, synchronous drive systems.

How to Choose or Customize the Right HTD Pulley

HTD pulley

Pulley Diameter

Selecting the appropriate diameter is crucial. The diameter affects the torque capacity and the overall size of the mechanical system. Smaller diameters are suitable for compact designs, while larger diameters are better for high-torque applications.

Number of Teeth

The number of teeth on the pulley determines the pitch diameter. More teeth generally mean a larger diameter, which can handle higher loads but requires more space.


Choosing the right material is essential for durability and performance. Aluminum is lightweight and corrosion-resistant, while steel offers superior strength. Plastic composites are good for noise reduction and lighter loads.

Bore Size

The bore size must match the shaft on which the pulley will be mounted. A mismatch can lead to inefficiencies and potential system failures.

Flange Requirements

Some applications require flanged pulleys to prevent belt slippage. Flanges add stability, ensuring the belt stays properly aligned during operation.

Why Choose Our HTD Pulleys?

HZPT specializes in designing, developing, and manufacturing high-performance parts, including HTD pulleys. Our products are popular in the European, South American, and Australian markets and have earned the trust of many customers.

Quality Assurance

We prioritize product quality, ensuring each pulley meets strict standards for durability and performance. Our quality control processes are rigorous to provide you with reliable components.

Customer-Centric Service

Our policy of “customer-first service” emphasizes meeting and exceeding customer expectations. We offer personalized assistance to help you find the right products for your needs.

Expert Team

Our young, vibrant, and capable team is dedicated to providing professional services. We have the expertise to handle any request, ensuring you get the best solutions.

Fast Delivery

One of our significant advantages is quick delivery. We have a well-stocked warehouse and efficient distribution system to meet your demands on time.

OEM Services

In China, we have a professional factory to develop new products and offer OEM services. We can customize pulleys according to your specific requirements, ensuring they fit perfectly into your systems.

For any inquiries or opinions, please feel free to contact us. We are committed to improving our services and offering the best quality products at competitive prices.