Custom Thread Length for High Strength Bolts

[32huynh]

All,

Per AISC the thread length of a 3/4" A325 bolt is 1 3/8".

Several bolt manufacturers will customize thread lengths per the customers request. Is there anything that prohibits the customization of thread length for high strength bolts?

Thanks

 

[connectegr]

There is no restriction on thread length. Fully threaded bolts are also available. The primary issue would occur is X values are intended.

http://www.FerrellEngineering.com

 

[racookpe1978]

You can make the bolt as short as you wish. However, at some point you begin to get too few threads to carry the stress applied: For example, you want a high strength bolt of a certain diameter to carry a calculated load. If less load were to be carried, you could use a lower strength material or a smaller diameter bolt.

If you try to apply that predicted load through only two or three threads, you will strip those threads - regardless of what the AISC default length is.