Roll bar connection

[Twentyover]

You'll have tension in the bolt as long as it is stretched. If the bolts are stretched in the same (parallel)direction. there should be no change in clamp force regardless of which end the head is pointing.

The fact the ballistic does it does not answer my question, why do they do it? How does it 'increase the strength substantially'? I am a mechanical engineer, and while doing seat pull testing early in my career, did some study on threaded fasteners. I don't recall anything that supports SDS's claim. I'm not saying he's wrong, I'm saying explain it to me so it makes sense.

[John Wright]

The fact the ballistic does it does not answer my question, why do they do it? How does it 'increase the strength substantially'? I am a mechanical engineer, and while doing seat pull testing early in my career, did some study on threaded fasteners. I don't recall anything that supports SDS's claim. I'm not saying he's wrong, I'm saying explain it to me so it makes sense.

Ballistic puts the threads in the opposing pieces so you would have to alternate the bolts or you would only get one bolt in....(point that I was trying to make with my 2nd post.)
I feel like I understand high strength structural bolting "somewhat", having been exposed to it here at work and on my 25th year with the company I work for....I am with you and your thought process of stretching the bolt from either direction results in a equal clamping force within the joint....what about shear? ....looks like you still have the same amount of force required to shear the bolts, no matter which way they are facing, so I think that doesn't come in play either.