"Dry Pin" Bearing Allowables

[SuperStress]

A colleague of mine mentioned that his company does not use a knock-down factor on the MMPDS-given allowable bearing stresses (F[sub]bru[/sub] and F[sub]bry[/sub]), and this concerned him. MMPDS is pretty clear that such knock-down factors should be used if all of the "dry-pin" conditions do not exist in your application (which they pretty much never do).

I'm curious though as to whether or not your companies use knock-downs on these allowables, and if so, how much? Is it an arbitrary percentage or have you gone through testing to determine statistically-derived A- and B-basis allowables?

This is really more of a poll than a question... Anyone who would like to comment is welcome. Please don't name your company in your replies.

Thanks,
SuperStress

 

[YoungTurk]

I never got further on this topic than the information shared in this old thread.

http://www.eng-tips.com/viewthread.cfm?qid=259226