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:
Sway Bar Mount; Under Frame
Product Details
Brand: Welder Series
MPN: 227012
Country/Region of Manufacture: Canada
Thickness: 3/16"
Hole size: 3/8"
Use to bolt the sway bar outer tube underneath your frame. 1" from the 3/8" mounting hole centerline to the top of the tube notch.
Threaded bungs and hardware also available.