To: "'seaint(--nospam--at)seaint.org'" <seaint(--nospam--at)seaint.org>
Subject: RE: Thread shear
From: Harold Sprague <harold.sprague(--nospam--at)neenan.com>
Date: Mon, 10 May 1999 13:47:58 -0600
Per Fastener Design Manual by Barrett, NASA Ref Pub 1228:
P = (Pi * dm * Fs * L)*(1/3)
P = Pullout load, lb
dm = mean diameter of threaded hole, in.
Fs = material ult or yield shear stress
L = length of thread engagement, in.
The 1/3 factor is empirical and allows for a degree of mismatch. If threads
were perfectly mated the factor would be 1/2.
The Neenan Company
From: Robert Rollo [mailto:rrollo(--nospam--at)TEAM-PSC.com]
Sent: Monday, May 10, 1999 11:05 AM
To: seaint(--nospam--at)seaint.org; structx(--nospam--at)mLists.net
Subject: Thread shear
what length of thread is required to develop the full tension of a grade 5
bolt (3/8" diam specifically).
is this a simple rule of thumb or must one figure the total shear plane
area, etc etc?
robert d. rollo, PE
Parkhill, Smith & Cooper, Inc.
(806) 747-7146 fax