Common Lines
This type of line shows visible edges.
What is an object line?
This type of line shows movement.
What is a phantom line?
This symbol shows half the distance across a round object.
What is the Radius Symbol?
This type of symbol shows the diameter of a dome.
What is the spherical diameter symbol?
Simplified extension lines are used to show a distance from a 0 point.
What is ordinate dimensioning?
This type of lines shows non-visible edges and surfaces.
What is a hidden line?
This type of line shows various positions of an object within an assembly.
What is a phantom line?
This symbol shows the full distance across a round part.
What is the diameter symbol?
This type of symbol shows the basis of all ordinate dimensions.
What is the origin symbol?
Using a squiggly line to show a layer or layers have been removed.
What is a broken out section?
This type of line show's what a dimension applies to.
What is an extension line?
This type of line shows positive mass within a part.
What is a section line?
This symbol shows a part has 4 equal sides.
What is the square symbol?
This type of symbol indicates a point to base GD&T off of.
Used when a dimension applies to multiple features, this symbol can save you a lot of space on your drawing.
What is number of times or places?
This type of line shows how large a feature of size is.
What is a dimension line?
This type of line shows an imaginary shortened part to save space on the drawing.
What is a conventional break line?
This symbol shows the location of a door and it's swing if applicable.
What is the door symbol?
This symbol shows how deep a feature is.
What is the depth symbol?
If you didn't want your dimension to be used for manufacturing, you would use this symbol.
What is the reference symbol.
This type of line shows where a section is cut through.
What is a cutting-plane line?
This type of line shows an imaginary removed edge of an assembly to expose the interior of the part.
What is a broken-out section line?
This type of symbol shows the location and style of window.
What is the window symbol?
This type of symbol shows a hole goes all the way through a part.
What is the THRU symbol?
Shown with 2 double arcs mirrored from each other, this symbol indicates a specific type of door.
What is the double swung door symbol?