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

[Taz99]

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

 

[dik]

catch the link

http://www.boltscience.com/pages/nutorbolttightening.htm

Dik

 

[Screwman1]

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.

 

[Taz99]

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

 

[thruthefence]

Most of these bolts have a radius under the head. make sure what ever hardened washer you use, has a corresponding radius, or relief to accept it.

http://www.nasbolts.co.uk/acatalog/washerspecs2.jpg