SDP/SI – Stock Drive Products/Sterling Instrument


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 in selecting the best part for your need. We also manufacture custom components and assemblies to your exact specifications.

Stock Drive Products/Sterling Instrument is a Designatronics company, serving customers globally since 1950. ISO 9001:2015 + AS9100D registered.


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

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

Stock Drive Products/Sterling Instrument is a leading manufacturer of timing belt and pulley drive systems, precision gears, gear assemblies, molded components, and other machined parts.

SDP/SI stocks a wide selection of small mechanical components that can ship the same day. Extensive online resources include design tools, a library of technical information, 3D CAD models, and detailed product specifications. SDP/SI engineers provide technical support and custom solutions.

Find the parts you’re looking for; get the new SDP/SI Inch Master Catalog.

Stock Drive Products/ Sterling Instrument
250 Duffy Avenue
Hicksville, NY 11801 USA
Tel: 516.328.3300


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