| A | B |
|---|
| Tolerance | The total permissible variation in a size or location dimension |
| Dual Dimensioning | Where alernate units are displayed within the same dimension |
| General Notes | Notes place separate from the views that relate to entire drawing |
| Nominal Size | The designation of the size established for a commerical product |
| Area | The extent or measurement of a surface |
| Three Dimensional | Having the dimensions of height, width, and depth |
| Two Dimensional | Having the dimensions of height and width, hight and depth, or width and depth only |
| Working Drawings | Drawings that convey all of the information needed to manufacture and assemble a design |
| Aligned Dimension | A system of dimensioning which requires all numerals, figures, and notes to be aligned with the dimension with the dimension lines so that they may be read from one side of the page |
| ANSI | American National Standards Institute |
| Arrowheads | Used to indicate the end of a dimension line or leader |
| Baseline Dimensioning | System of dimensioning in which all dimensions are placed from a datum and not from feature to feature |
| Chain Dimensioning | Dimensions that are from one point to the next, can be called point to point dimensioning |
| Extension Lines | Thin lines used to establish the extent of a dimension |
| Location Dimension | A dimension that defines the relationship of a feature of an object |
| Reference Dimension | A dimension used for information only and is a repeat of a given dimension, is show enclosed in ( ) |
| Unidirectional Dimension | A dimensioning system which requires all numerals, figures, and notes to be lettered horizontally and be read from the bottom of the drawing sheet |
| Datum Dimensioning | A dimensioning system where each dimension originates from a common suface, plane, or axis |
| Dimension Lines | Lines that are thin lines capped with arrowheads, which may be broken along their length to provide space for dimension numerals |
| Size Dimensions | Placed directly on a feature to identify a specific size or may be connected to a feature in the form of a note |
