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Any restrictions against applying the torque from the Head side of a bolt?
3

Any restrictions against applying the torque from the Head side of a bolt?

Any restrictions against applying the torque from the Head side of a bolt?

(OP)
Hi All,
I have a (non aerospace) installation where due to a lack of access I was considering using either a socket head bolt or 12 point head bolt and I would apply the torque from the head side while holding the nut fixed with a custom made tool. I think you would usually apply the torque from the nut side, is doing it this way a problem?
I am using 1/2 dia bolts, with enough torque to reach 75% yield strength of the bolt.
The advantage of using these bolts as opposed to a hex head bolt is that a smaller socket is required for the same diameter bolt.
Thanks

RE: Any restrictions against applying the torque from the Head side of a bolt?

That should not be a problem. If you use the socket head screw design, make sure that you add a hardened washer under the head to distribute the contact stress; those bolts were originally designed for tool and die work in hard steel and the underhead bearing surface is too small for average use.

RE: Any restrictions against applying the torque from the Head side of a bolt?

(OP)
Great thanks for the replies, we have decided to go ahead with the socket head bolt plus a washer.

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