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:
Fishplate; 2-1/2" x 5"
Product Details
Brand: Welder Series
Country/Region of Manufacture: Canada
Thickness: 10 ga
Buy 10 of one part number, get 10% off.
Buy 40+ to get 40% off! Sorry, no additional discounts applicable.
2-1/2" x 5", used to reinforce a butt-welded joint. 10 ga mild steel. Available with or without a hole in the middle.
The plate can be put on the inside or outside of the frame or holes can be drilled in the frame and rosette welds can be used to weld the plate inside the frame tube.
Available solid or with a 1-1/2″ dia. hole.