A leader line is a line referring to some form of feature that could be a dimension, an object or an outline. A leader line consists of two parts. These are:
■ A type B line (thin, continuous, straight) going from the instruction to the feature.
■ A terminator. This can be a dot if the line ends within the outline of the part, an arrow if the line touches the outline or centre line of a feature or without either an arrowhead or a dot if the line touches a dimension.
Examples of leader lines with arrowheads and dots are shown in the vice assembly and the movable jaw drawings.
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