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How do they make 4-40 or smaller hex socket {alan } SET SCREWS?

edwin dirnbeck

Hot Rolled
Joined
Oct 24, 2013
Location
st,louis mo
It seems as if they form the socket first ,it would distort when you roll the threads. If you roll threads first ,the threads would distort when forming the socket.Is the socket formed hot?
 
It seems as if they form the socket first ,it would distort when you roll the threads. If you roll threads first ,the threads would distort when forming the socket.Is the socket formed hot?
I'm just guessing but maybe they cold form the hex socket and then roll the threads with a hex plug in them.

This is a video that looks like they are using a 4 slide machine to make them on.
 








 
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