Standard Line Types and Title Blocks

ANSI - The American National Standards Institute
ASME - The American Society of Mechanical Engineers
ANSI and ASME are organizations that established technical drawing stardards which are internationally used in manufacturing processes, such as standard sheet sizes, title blocks, line types, etc.

Line Types


Center lines are used to mark the centers of circles and axes of symmetrical parts
Break lines are used to show where an object is broken to save drawing space or reveal interior features.
Dimension and extension lines are used to indicate the sizes of features on a drawing.
Section lines are used in section views to represent surfaces of an object cut by a cutting plane.
Cutting plane lines are used to show the locations of cutting plane.
Visible lines are used to represent features that can be seen in the current view.
Hidden lines are used to represent features that cannot be seen in the current view.
Phantom lines are used to represent a movable feature in its different positions.
Stitch lines are used to indicate a sewing or stitching process.
Chain lines are used to indicate that a surface is to receive additional treatment.
Symmetry lines are used as an axis of symmetry for a particular view.

Title Blocks

FSCM (Federal Supply Code for Manufacturers) is a unique identifier assigned to a manufacturer.
DWG NO. indicates the number assigned to a single drawing.
REV. indicates the revision level of the drawing to represent its most current status.
SHEET _ OF _ indicates the first sheet of a multiple drawing set and the total number of sheets in the set. Subsequent sheets indicates the sheet number and the total number in the set.