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RE: Grade 8 Bolts

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It's his money and his risk.   He gets the benefit and accepts the
responsibility if the bolts fail.  It sounds like they had no or few bolts
for a long time.  Maybe the risk is low. but you made your recommendation,
If you Client does not like it Maybe he or his staff should monitor the
bolts and provide monthly/weekly inspection.  

Just my thoughts  Dan Novak

-----Original Message-----
From: Fountain Conner [mailto:fconner(--nospam--at)pcola.gulf.net]
Sent: Friday, February 25, 2000 8:00 AM
To: seaint(--nospam--at)seaint.org
Cc: StructTX
Subject: Grade 8 Bolts


I have an long-time industrial client who recently replaced a bunch of
*missing* structural bolts with "Grade 8" (I assume SAE, Grade 8) bolts.  I
can only guess what happened to the original bolts.  I'm sure they weren't
stolen, so that leaves the options of working loose or breaking under
repetitive load cycles -- This is a vertical bolt, attaching a crane girder
to a column cap plate.  Can anyone say, "fatigue"?

I'm not comfortable with this replacement.  So far as I can tell, the grade
8 machine bolt is hard, tough, and *brittle*.  'Sounds like courting
disaster to me...

I recommended replacing the *new* bolts with A325, but the client is
reluctant to spend money twice for the same work.  

Guidance and counsel, anyone?  

Fountain E. Conner, P.E.
Gulf Breeze, Fl. 32561