Glossary

An O-ring is a rubber washer that is round in profile instead of flat. Used in valve stems and push-on fittings to create a watertight seal 

O.C. or on center is even spacing of studs in a wall or other parts in a ceiling or floor by measuring to the center of each component. 

OD orOutside Diameter is the outside dimension of a round pipe or tube

Oil-based paint is a category of paint that includes Alkyds and Enamels and uses oil as a liquid carrier instead of water. Also requires chemical solvents for cleanup

On center refers to the process of placing studs or other framing members centered on a specific repeated spacing in a wall (like 12”,16”, 24”). Sometimes expressed as "O.C."

The on/off switch is an electric switch that supplies current to the automatic shutoff stage of a compressor

A special manufactured floor component made of top and bottom chords and vertical and diagonal center web parts held together with nail plates at connections. These trusses are lightweight and able to span long distances while being open in their centers for systems to pass through.

The orbital action adjustment is a dial to set more or less circular motion to the cutting action of a reciprocating blade – more orbital motion = faster, rougher, and more aggressive cut

An orbital sander is a tool that uses very small vibrating circular motions to slowly remove material

Organic vapors are liquids that evaporate quickly in a gas and are usually petroleum-based (ex – acetone, paint, gasoline)