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:
Frame Bracket Sideplate
Product Details
Brand: Welder Series
MPN: 222012
Thickness: 3/16"
Hole size: 1/2"
3-1/2" x 3-1/4" with one 1/2" dia hole, 2-5/8" from opposite edge
