Standard and Custom Timing Belt Pulleys

Celebrating our 50th year in business, Circular Technologies is a quality manufacturer of many different types of timing belt pulleys.  We know that you require high-precision and we pride ourselves on the performance of our products.  We put our decades of expertise into our manufacturing processes to ensure consistent and dependable results. 


Circular Technologies was named in part because of our history in making precision drive components, like timing pulleys. We supply nearly all miniature timing pulley profiles that are available in metric and imperial dimensions. See the list of profiles below. Drive components and assemblies are our specialties. We offer individual timing pulleys or shaft assemblies, complete with bearings, mounting blocks.  Sizes offered are standard and custom.  Contact us and we can assist you in making a selection that’s right for your application.

We aren’t intimidated by tight tolerances. We can achieve bore tolerances down to +/- .0005″ or under.  Runout can be held to better-than-industry tolerances (.002” or less). 

For quality timing belt pulleys and much more, turn to Circular Technologies. Please visit our contact page and let us know which products we can assist with. 

Profiles Available

  • MXL (MP) (.080”)
  • 40DP/LT (.0816”)
  • XL (.200”)
  • L (.375”)
  • H (.500”)
  • 3mm HTD®
  • 5mm HTD®
  • 8mm HTD®
  • 2mm PowerGrip GT®
  • 3mm PowerGrip GT®
  • 5mm PowerGrip GT®
  • 8mm PowerGrip GT®
  • FHT1 (1mm) Fenner
  • FHT2 (2mm) Fenner
  • FHT3 (3mm) Fenner
  • AT5, AT5N, T5 & T5N (5mm)
  • AT10, AT10N, T10 & T10N (10mm)
  • Poly-V® profile pulleys – J & H section
  • Flat, Crowned and Grooved

We are an authorized timing pulley manufacturer for all Fenner Precision profiles.

Materials available in aluminum, carbon steel, stainless and machinable plastics.

Please call for other materials.


HTD®, Power Grip GT® are registered trademarks of the Gates Corporation.

Poly-V® is a registered trademark of The Goodyear Tire & Rubber Company.

Pulley Stock

Whether you need one bar or 100, all of our profiles are available for purchase. There is no minimum quantity to buy on pulley stock.  All of our pulley stock is hobbed in-house to industry standards.  Just provide your specifications, and we will work right away to build your order.


Did you know? On under 1″ diameter, we offer 21″ extra-long pulley stock.  And yes, it is hobbed. Fewer bars to load in your machine means greater productivity on your floor. Call us. You will be pleased with the results.

We can cross-reference all major competitors’ part numbers.

Want to See Our Pulleys Before You Buy?

Circular Technologies


Circular Technologies

Pulleys & Pulley Stock

Quantum Assy

Precision Machined

Pulleys 3 Different

Mechanical Assembly