A section drawing shows detail on
the inside of an object by cutting
away part of the object.
Q: Why do we call this a “Full” section?
A: The cutting plane line cuts through the entire length,
height, or width.
CUTTING PLANE LINES
•Cutting plane lines mark the point at which the object is to be
cut apart (wide double dashed line). Cutting plane lines must
be labeled by A-A or X-X or Y-Y.
Sight lines point to the part of the object that is to be kept.
No hidden lines on the sectional portion of a view
Hatching is used to show where the object has been cut. In
other words, if the part was cut with a saw, the hatching would
represent where the saw actually touched the object as it was
Hatch lines (.3mm)
The pattern of the hatching used represents different types of
materials. In the case above, a generic hatch has been used.
This generic hatch is sometimes used to represent iron or steel.
Hatch lines should match the color of the cutting plane line.
Web, Bolt, Nut, Shaft and Seal