Primary and Secondary Functions

The first step in specification of a COT component is the identification of the type of component. This will depend on the primary function of the component. However, there are many components that can implement similar high-level functions. The decision often comes down to secondary functionality. For example, the primary function of “transmit power” can be accomplished with many different types of components such as belts, various types of gearing etc. However, if secondary functionality like changing the direction of the power is also needed, then components like bevel gears make more sense than belts and pulley systems.

The table below details the primary functional categories for many common mechanical components. Most of these components are COTs but some will require significant work with suppliers to design. The following pages will detail the specification process for some of these components but not all. We will focus on the components that can be readily purchased without needing to work closely with suppliers to customize the component.

Table of the High-Level Common Mechanical Component Types and their Primary Functionality