Stock Drive Products/Sterling Instrument (SDP/SI) is a manufacturer of motion control and small power transmission components. Design engineers and original equipment manufacturers rely on SDP/SI for high-quality components, subassemblies, and engineering expertise. As a company founded and managed by engineers we understand and respond to the developing needs of our customers better than anyone. Standard sizes or customized, our precision gears, high-quality machined parts and molded components can be utilized in a wide variety of applications and industries.

SDP/SI manufactures thousands of inch and metric, precision- and commercial-quality, small mechanical components. With years of application and product experience, our engineers can assist you in selecting the best part for your need. We also manufacture custom components and assemblies to your exact specifications.

Customized Components and Assemblies

SDP/SI offers a wide variety of products and services used in applications worldwide, including aerospace, defense, military and commercial aircraft, robotics, and medical.

Our manufacturing expertise includes precision gear cutting, 5-axis milling, 9-axis Swiss turning, and world-class quality with a defect rate of less than 1%.

  • Timing Belts and Pulleys
  • Precision Gears
  • Precision Gearboxes
  • Precision Machined Components
  • Molded Components
  • Mechanical Assemblies
  • Contract Manufacturing

Small Mechanical Components Ship From Stock

Explore, design, shop online. SDP/SI offers detailed product specifications and free 3D CAD Models 24/7. Items in stock ship the same day.

Stock Drive Products/Sterling Instrument is a Designatronics company, serving customers globally since 1950.