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Wide continuous line
outline and edges
Narrow continuous line
dimensions and extension lines
handwritten lines
partial views
dashed line
hidden lines
dashed and dotted lines
symmetric
First angle projection
used in Europe. projections are flipped
Third angle projection
used in USA. projections are mirrored
Full section
full section cut
half section
half is section cut half is outside
local section
a local part is in section cut
cross hatching
drawn in a 45 degree angle to show where the part is cut
pitch
length between every thread to show how far the screw goes in a full rotation
Major diameter
The whole bolts width with threads
Minor diameater
width of bolt with out the threads