Hey guys,

Does anyone know what size tubing is used for subframes, both the diameter of the tubing and the wall thickness of it ?

i assume its 1.25, it looks smaller then your average 1.5 for roll cages.

if anyone can let me know that would be great

Thanks, Keith

 

i figured it out guys, this can be deleted

 

Better than being deleted (threads aren't deleted), you can share your findings with the rest of the class. I'm sure it's posted elsewhere, but it never hurts to have it recently posted at the top of the Forum.

 

I never made mine but I think it's 2" x 2" x .134" (or less) wall square tubing. It doesn't need to be very heavy.

Roll bars are 1-3/4" tube. Roll cages are mostly 1-5/8" tube.

 

I used 1 1/2 x 0.090 wall square tubing for mine.

 

2"x2" mild steel tubing for mine... thickness was prob .100 or something i got it off ebay and just made my own with the material

 

Are you talking about the car's 'subframe' or subframe connectors?

Spohn's are 1.75" OD 0.120" wall thickness round steel tubing of unknown to me yield strength. UMI's are 2.00" x 1.25" 0.120" wall thickness rectangular steel tubing of unknown yield strength as well. IIRC my SSM connectors are 2.0 x 1.5 0.120 wall but weak side rather than strong side in orientation, 36ksi yield strength from what I found on them years ago.

 

alstons are 1.75x.120 or .134 round tubing

 

That is a bit on the thin side unless it is 4130 material.

When I made mine I used tubing that was 1 3/4" DOM. The wall thickness is .134 The mounting plates on the front are 7ga (3/16") mild steel and the rear mount is attached with a two part mount system. The first part was welded in prior to the SFC and is a U shape part that was welded in 360 degrees and form fitted in there. It was about 7" long. Then the rear of the SFC slid up in there and was welded along the sides and bottom. (hard to explain but worked out great and made for a perfect fit!)

I have a air/hyd mandrel bender. So you can do it different but this was how mine were made.

See attached links for pictures and fabrication of the SFC's

https://www.thirdgen.org/forums/su...-wont-fit.html (what SFC's wont fit longtubes?) (what SFC's wont fit longtubes?)

https://www.thirdgen.org/forums/ex...html?highlight (My exhaust picture) (My exhaust picture)=

https://www.thirdgen.org/forums/fa...html?highlight (1982 Z28 Silver State project) (1982 Z28 Silver State project)=