I've done a search and can not find the info I need. I;m looking for the thickness of pipe used for 1 5/8 roll cage piping and the size and thickness of tubing used for back halfing a car.

 

.083 min for chromemoly
.118 min for mild steel

don't think there are any "rules" about the backhalving

 

well what would you use for it?

a buddy is going to use it for the frame and I'm going to use the same stuff for through the floor sfc.

 

I'd prolly get a backhalf kit from S&W or the like

 

well I still need the stuff for the my sfc.

I just need to know the size, like is it 2X3 and the thickness.

 

we do our sfc out of 1 5/8 tube

 

Fireball is right about the tubing thickness as far as the moly cage is concerned. But the .118 min. mild steel cage must be DOM tubing to be the .118, otherwise it has to be .134 wall electric weld mild steel tubing due to the incosistencies in the tubing when you bend the tube it can be less than .134 in the bend. If it were me and I was going to due a cage an connectors I would do the moly. The only downfall is that it all has to be tigd.

The frame rails on a back half car have to be min. .125 wall 2X3 rectangle tube, .118 1 5/8 DOM, .134 1 5/8 Electric Weld, or .083 1 5/8 Moly to pass NHRA.

 

thank you that's what I was looking for.