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:
Transmission Mount Side Plate
Product Details
Brand: Welder Series
MPN: 211522
Country/Region of Manufacture: Canada
Thickness: 1/4"
Hole size: 7/16"
Approx. 10" x 6-5/8" with two 7/16" holes on 3-1/2" centers.
