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RE: Grade 5 bolts

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There was a discussion in May about this.  Check in the Email archive
under "Correlation of structural fasteners."
Ed Marshall, PE

> -----Original Message-----
> From:	AnandNene(--nospam--at) [SMTP:AnandNene(--nospam--at)]
> Sent:	Monday, September 21, 1998 4:22 PM
> To:	seaint(--nospam--at)
> Subject:	Grade 5 bolts
> Can someone comment on use of Grade 5 (ASME/ANSI B18.2.1) bolts in
> place of
> A325 bolts?  I am talking about 1/2" and 5/8" dia bolts used for
> design of
> small steel frames which house equipment.  The design is based on use
> of 1/2'
> diameter A325 bolts for a frame that is designed for UBC seismic zone
> 4.
> Published strength of Grade 5 bolts is Fu=120,000 psi which is same as
> Fu for
> A325 bolts.  My concern is that small size bolts are typically zinc
> plated and
> therefore may not be suitable for structural application.  My initial
> response
> is not to use Grade 5 bolts.  However, I would like your opinion.  Is
> it o.k.
> to use if there is no zinc plating (as for larger diameter Grade 5
> bolts)?
> Thanks.
> Anand Nene, S. E.