Originally Posted by curtisreed
Originally Posted by laxking012
Not saying your wrong, but I'm pretty sure in the 2012 NHRA rulebook I have, it says min. .118 mild steel for roll cages?
Pretty sure you are right about that. What can happen is the .120 wall might not sonic test thick enough. It is way more consistent being drawn but it will still vary slightly. Just the chance you take with using it on a cage.
Zip, can you get .134 wall DOM?
On a side note it is pretty cool to watch them make DOM tubing. I have toured a tubing manufacturing facility before.
Curtis
No Curtis, i cannot get .134 wall 1 3/4" DOM it only comes in EWS tubing but i still like the DOM @.120 wall. I know it's a gamble. The NHRA rule book says 1 3/4" X .118 min wall and that's the reason the roll cage mfg. will only sell EWS .134 wall, they have to guarentee it will pass certification.
Bottom line is the tolerance of DOM for 1 3/4" DOM is +.002/ -.004 and could very well fail a sonic test.
Below is a wall thickness tol. chart which shows all the tol.
Zip.
