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Old 09-19-2015, 09:22 AM
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Tie rod material.

I recently needed to build a tie rod. I took my old tie rod into a steel supplier to match it to some tubing. The closest was a half inch black pipe. I bought a 32" length and had it tapped for the tie rod ends. Everything bolted up well, but I have become concerned with the idea of using pipe vs tubing. It appears to work well. How much stress are tie rods really under? Should I be concerned with safety or will this material be suitable?

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Old 09-19-2015, 10:21 AM
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Quote:
Originally Posted by 1957plymouth View Post
I recently needed to build a tie rod. I took my old tie rod into a steel supplier to match it to some tubing. The closest was a half inch black pipe. I bought a 32" length and had it tapped for the tie rod ends. Everything bolted up well, but I have become concerned with the idea of using pipe vs tubing. It appears to work well. How much stress are tie rods really under? Should I be concerned with safety or will this material be suitable?
There are two things you need to be concerned about, strength and stiffness. The stiffness is not a problem with the black pipe, because all steel and iron has about the same modulus, so the stiffness is pretty much only a function of diameter and wall thickness, which should be greater with the iron pipe.

Your problem is strength. The iron pipe likely has a considerably lower strength than steel tube, and that is compounded by the fact that material quality is less well controlled, so there are possibly flaws in the material that can initiate cracks. I'd be especially concerned about the shear strength of the threads.

Bottom like: don't use the iron pipe in this application.
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Old 09-19-2015, 12:32 PM
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What is used for that sort of thing is seamless DOM tube which can be ordered in various diameters and wall thickness. You need to go to a specialty supplier such as metal supermarket to get that kind of material.

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Old 09-19-2015, 04:21 PM
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Check with some 4x4 fab shops like bluetorchfab.com or davesoffroadsupply.com. if you know the thread pitch of your tie rod end you can buy weld in bungs that will slip inside Dom tubing. That's what we run in our rock crawling jeeps and trucks. I bought bungs that would accept one ton Chevy tie rods and got some 1.5" dom tubing with 1/4" wall thickness. You can buy sticks of tube and bungs from these places.
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