Pattern Development Key Terms

Front

Abbreviation

Back

A shortened form of a word or phrase used for brevity and standardization in layout communication.

Front

Bolt Circle (BC)

Back

The imaginary circle passing through the centre of bolt holes in a bolt pattern.

Front

Bolt Circle Diameter (BCD)

Back

The diameter of the bolt circle.

Front

Bottom Dead Centre (BDC)

Back

The lowest point of travel of a reciprocating part, such as a piston.

Front

Centre to Centre (C to C)

Back

A measurement taken from the center of one feature to the centre of another.

Front

Centreline (CL)

Back

A line used to indicate the axis of symmetry or the centre of a feature.

Front

Complete With (C/W)

Back

Indicates that an item is supplied with the specified components.

Front

Diameter (D, Dia, ø)

Back

A straight line passing from side to side through the centre of a circle or sphere.

Front

Degrees (Deg °)

Back

Units of angular measurement.

Front

Foot/Feet (Ft ')

Back

A unit of length in the imperial system.