Ok. So I'm losing my mind. I have the threaded bungs to weld into tubing. They are machined to fit into a 1 inch inside diameter tube. Everything i have found around here are either a little too big or little too small. After some searching, I decided I need DOM tubing, but what THICKNESS???!!!!??? These will be about a 4 ft ladder bars for a g***er style drag car. (57 chevy). I'm sure thicker would be stronger, but also don't want em to be 500 pounds each either! Any help would be very much appreciated. Thanks
1 1/4" x .120 wall If you're actually going to race it there should be published specs for what they need to be. Looks like S&W uses 1" x .156" 42" G***er Ladder Bar With Chromoly Rod Ends https://share.google/2vzWAqZz9jlFUDad0
I've seen them from .156 to over .2 Depends on who makes them and how they mount the heim joints. If they have welded bungs then around the .156 to .188, if they drill and tap the tube's then they are over .2 Me personally I like thick wall, what I've done in the past, it's been too long to remember numbers, but I "think" I started with .188, took the bungs and turned down the ends to tap fit into the tubes. I also drilled a hole all of the way thru the tubes at the bung ends. I chamfered the tube ends and the bungs. This way when the bungs were tapped into the tubes I had a nice "V" to fill with weld and a hole to plug weld thru the tube into the bung where it was inserted into the tube on 2 sides. Then I ran a tap thru it to clean and clear up any distortion caused from the plug welds. ....
From the guy who knows nothing, when it comes to most things, it's depends on the how and what, how you build them and what kind of abuse they'll see. You could error on the better safe than sorry side, or, you could trust the material until it fails in service? My how was they were pre built, and the what was to get it rolling with a rear end under it. That said, most charts will list an OD a wall thickness, ID and weight per foot.
1 inch od with .156 wall tubing will tap 3/4 x 16 without any thing done to it the id is correct for the tap it is what a lot of race four link kits use until they go to 1 1/4 or 1 3/8 chrome molt rube with welded in bungs
I'm not tapping for threads. I have the threaded bungs that are machined to fit into a 1 inch inside diameter tube
Like @iagsxr said. 1 1/4" x 120 wall. You could go thicker wall and drill, ream or machine the ends out to fit your 1" bungs. But the size listed above will be plenty strong.
Seems to me the question about the snugness of fit into the hole isn't as important as how good the weld will be at holding it there...?
Take the "bung" with you. When you find some tubing it won't quite fit into but the OD is what you want, then you can drill or ream it to fit the bung. Maybe you get lucky and find a nice slip fit, but if you get an undersized id, you can have a thicker wall while having an od thats not too large and get a nice fit too. Then a couple of plug welds to accompany the weld on the end and it should be very strong.
I built these out of 1-1/8th .058 wall 4130. A 1" bung fits perfectly. They are long, strong and pretty light.
The Jalopy Journal
