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:
Master Cylinder Plunger Rod
Product Details
Brand: Welder Series
MPN: 20264
Country/Region of Manufacture: Canada
Diameter: 3/8"
Thread: 3/8-24
Length: 4-1/2"
3/8" dia. x 4-1/2" long with a 3/8-24 thread on one end and a bullet nose on the other. CNC machined.