Torque applied to a 8-32 SCHS
Torque applied to a 8-32 SCHS
(OP)
Can anyone tell me how much torque can be applied to a 8-32 Stainless steel Socket cap head bolt that is 3-1/2" long ?
Thanks
Cobb
Thanks
Cobb
Scott Cobb
CSM Manufacturing, Inc
csm-mfg.com





RE: Torque applied to a 8-32 SCHS
RE: Torque applied to a 8-32 SCHS
Once again Corypad is right. If we can make some assumptions that the stainless you are using is ASTM F593 speced, and you use 75% of the yield for this product, and assuming that the 'sandwich' you are working is a 'fairly' stiff joint not in excess of 1.25"; and that there is no coating on the screw other than the normal passivation for stainless, then that makes the coefieient of friction for the joint roughly 0.275; the applied torque then comes out to be 28.4 Lbf-in.
At 95% of yield that torque figure becomes roughly 36.0 Lbf-in. This level of use is not recommended. I like to stay in the 65% - 75% range.
By the way, the 65% level is roughly 24.6 Lbf-in.
I am using BoltSciences TORKSense software to determine these numbers.
Be sure to follow up with verification testing.
fastech
Bill P.
CSFT, Inc.
RE: Torque applied to a 8-32 SCHS
Scott Cobb
CSM Manufacturing, Inc
csm-mfg.com