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:
Tabs
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40 @ 40% off!
Frame Tab for Round Tube
C$4.50
Frame Tab for Round Tube
For 1", 1-1/4", and 1-5/8" tubing.