A chart of broaches and an example of their work. Key:
<p>A. Square
B. Round
C. Single keyway
D. Double keyway
E. 4-spline
F. Hexagon
G. Rectangular
H. Double-cut
I. Internal gear
J. Round
</p>
K. Helical groove
Franklin Day Jones, Douglas Thomas Hamilton, Chester L. Lucas
Broaching, page 10