Torque specs on dissimilar fasteners
Torque specs on dissimilar fasteners
(OP)
We are currently in a dilemma on deciding the correct torque for a 316ss 3/4"-10 unc bolt threaded into a block of 6061 aluminum approximately 2" deep. There is some confusion as to what the correct torque spec would be when two dissimilar fasteners are mated.
I have searched and cannot find any standards on this topic. Would you use the torque rating for a aluminum fastener or would it be higher? Also, if a threaded locking insert/helicoil was used would that change the situation any, other than just reducing the chance of galling/stripped threads? I should also note that this is an electrical connection.
Thanks
I have searched and cannot find any standards on this topic. Would you use the torque rating for a aluminum fastener or would it be higher? Also, if a threaded locking insert/helicoil was used would that change the situation any, other than just reducing the chance of galling/stripped threads? I should also note that this is an electrical connection.
Thanks





RE: Torque specs on dissimilar fasteners
RE: Torque specs on dissimilar fasteners
RE: Torque specs on dissimilar fasteners
RE: Torque specs on dissimilar fasteners
RE: Torque specs on dissimilar fasteners
http://www.dalecompany.com/pdf/UNBRAKO.pdf
Your stainless bolt will likely not tolerate SHCS torque, so could "get away" with less engagement.
Note their comment on page 64/66 about using figgerin' and cypherin' to come up with tapped hole thread strength being "not entirely satisfactory". Thus what they chose to present in the technical section of their "engieering guide" were tables created using empirical data from tests done with non-digital threaded test pieces, real bolts, and torque wrenches of some type.
As others said, depending on what you are securing, there is a minimum torque you need.
If loosening is much of a concern, I'd attack it with adequate general purpose torque, and making several diameters of bolt "grip length" available, and making the clamped component "thick enough" and nice mating surfaces .
RE: Torque specs on dissimilar fasteners
RE: Torque specs on dissimilar fasteners
Try this site:-
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RE: Torque specs on dissimilar fasteners