When we ran a full service chassis fab/turn-key hot rod shop a number of years ago, it was always useful to have threaded things around to weld into the frame for some kind of mount, etc.
Here’s a list of all our threaded things for your reference:
5/16-18
3/8-16
3/8-16 x 2″ long
7/16-20
1/2-20 x 3/4″ long
1/2-20 x 1-3/16″ long
3/4-16 x about 6″ long, typically used for a steering shaft bearing support.
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