Precision Gears, Timing Pulleys & Belts

Spur Gears page Anti-Backlash Worm Gear Gearworm
Spur Anti-Backlash Worm Gear Worm
Helical Bevel Pinion Shaft Ground
Helical Bevel & Miter Pinion Shafts & Pinion Gears Ground
Gear Rack, Rectangular Gear Rack, Round Custom  
Gear Rack, Rectangular Gear Rack, Round Custom  

Timing Pulleys Timing Belts Timing Pulley Stock Timing Pulley Flanges


Precision gears are important mechanical components in many devices ranging from small watches to huge drive wheels of ships. They rotate in mesh with other gears to accomplish speed reduction and torque increase. They can also change the direction of rotation and some can change the angle of axis. When a gear is meshed with a Gear Rack, it converts rotary motion to linear motion.

Gears are a positive drive and unlike V belts and flat belt drives,  will not slip or creep. Virtually any ratio reduction can be attained with a series of gears or gear pulleys.

Ondrives.US has many decades of experience manufacturing fine pitch and coarse pitch gears, inch and metric gears, commercial quality and high quality gears to AGMA (American Gear Manufacturers Association) standards.

Diametral Pitch is the most common method of classifying gears. It describes the number of teeth in a 1 inch diameter gear. A 1 inch diameter gear of 120 diametral pitch will have 120 teeth while a 12 diametral pitch gear of the same diameter will have only 12 teeth.

Circular Pitch is a less frequent method of classifying gears. It refers to the distance from a point on one gear tooth to the corresponding point on the next gear tooth, measured along the pitch circle.  A 120 diametral pitch gear would be the same pitch as a 0.02618 circular pitch gear

The pitch of metric gears are normally described as gear Module or Mod. Mod is the pitch diameter in millimeters divided by the number of teeth.  

Pressure Angle of a gear refers to the angle made by the sides of a gear tooth as they incline toward the top of the gear. Common pressure angles used are 20 degree and 14.5 degree.

When selecting any style of precision gears, it is necessary that the Pitch and Pressure Angle of both gears be identical.

Ondrives.US offers the widest standard range of gear types: Spur gears, Anti-Backlash gears, Worm gears and Worms, Helical gears, Bevel gears, Miter gears, Pinion Shafts, Cluster gears, Gear Rack, Gear Segment, Sector Gears, Hobbed gears, Shaped gears, Ground gears.  

We carry a broad range of standard precision gears, gear pulleys, and timing pulleys and belts in stock or we will manufacture gears to your specification in almost any material.

Ondrives.US Precision Gears Technical Data will give you information about gearing dimensions, formulas, quality, materials, backlash, limits and fits that you can use to help select and design gears for your assembly.

The Ondrives.US Advantage:  We know gears and gear applications.

  • Standard, modified or complete custom gears
  • Ratios are almost unlimited
  • Inch or Metric gears
  • Broad selection of gear styles
  • 30 plus years of experience in manufacturing gears
  • Gears for Instrumentation, Servo drives, Encoders or Power Transmission
  • Standard gears in 303 Stainless Steel, Anodized Aluminum and Acetal
  • Custom gears made in almost any material

Mount your gears on an Ondrives.US Precision Ground Shaft, available from stock.   

Timing Pulleys & Belts 

Timing pulleys & belts work together to transmit rotary motion on parallel axes. They require very little maintenance and can span larger distances with fewer parts than gears, saving substantial cost.  Choose from standard pulleys, request modifications to meet your application needs, or specify complete custom timing pulleys & belts to be manufactured by us.