Glossary “inside diameter (i.d.)” Definition:
The diameter of the inner walls of a pipe or tube.

Glossary “inside micrometer” Definition:
Used to measure bore or hole size. It may be necessary to use an extension rod to increase the micrometer’s range, if the bore is large.

Glossary “inside vehicle lubrication services” Definition:
Work performed inside the vehicle during a chassis lubrication such as changing the mileage sticker, lubricating the ignition-lock cylinder and the glove-compartment hinges and lock, and inspecting safety-related items.

Glossary “inside calipers” Definition:
Tool design to measure inside parts. They are accurate to about 1/64th of an inch.