Way To Check Roll Bar

A easy way to tell if it is DOM or ERW is to contact your area NHRA (Drag) tech, they check the wall thickness with a little sonic type tester. He puts a little jelly on the tube and sets the probe on it. Same way they check it at the Run offs. Have him check the same tube from 3 different sides and average the readings. ERW has anywhere from 5-10 thousandths or even more variance in the wall thickness, I am shooting from the hip on these numbers. You can the exact measurements from your local steel tube supplier.You will get around 2-5 thousandths with DOM. Our local rep charges $35 for the test.
 
Ok thanks, looking inside the bar there is no visible line or anything. It is all smooth. I will take it somewhere and see though to be 100% sure. Thanks!
 
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