Thanks to Frank for catching the mistake on my
previous bolt posting. The hot dip galvanized bolts
are actually G5 and not G8.
Jeff
--- donovanf@starpower.net wrote:
> Jeff,
>
> Please check the head markings on your galvanized
> Grade 8 bolts.
> If they're actually Grade 8, they'll have 8 radial
> lines marked on
> the head. The reason I ask is that I've never seen
> a galvanized high
> strength alloy steel bolt. Grade 8 bolts are
> typically plated and
> have a gold color.
>
> The ASTM A490 specification for high strength bolts
> does not allow
> galvanizing because of the high risk of reducing the
> strength of the
> heat treated steel alloy during the hot dip
> galvanizing process. SAE Grade 8 bolts use the same
> high strength alloy as Grade 8 but they're
> less expensive (and more common in consumer stores)
> because the SAE
> specification doesn't require testing.
>
> I understand that some overseas manufacturers do
> offer mechanically
> galvanized (N O T hot-dip galvanized) high strength
> steel alloy bolts.
> I suspect they're much more expensive than plated
> SAE Grade 8 bolts and
> they're probably not readily available in the USA.
>
> The alloy steels used in high strength bolts are
> brittle and achieve their fastening strength only
> when properly tensioned by
> professionally trained installers with special tools
> and methods. Its
> very unlikely that high strength bolts actually
> achieve any benefit in
> amateur installations, and can actually be very
> hazardous if not
> professionally installed.
>
> My advice: Don't use high strength bolts unless
> you're a trained and experienced professional. In
> critical applications, use ASTM A325
> bolts which can be safely installed by
> non-professionals. In less
> critical applications use SAE Grade 5. If you must
> use high strength
> bolts, obtain the training and equipment to use them
> safely.
>
> 73
> Frank
> W3LPL
>
> ---- Original message ----
> >Date: Thu, 18 Oct 2007 13:13:18 -0700 (PDT)
> >From: Jeff Walker <k4bp@yahoo.com>
> >Subject: [TowerTalk] Galvanized grade 8 bolts
> >To: towertalk@contesting.com
> >
> >
> >Galvanized grade 8 bolts are available in bulk at a
> >VERY reasonable price from...
> >
> >Gulf Coast Fasteners, Inc.
> >1626 Town Hurst
> >Houston, Texas 77043
> >
> >(713) 464-1555
> >
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