oops... of course Grade 8 bolts they have six radial lines.
---- Original message ----
>Date: Fri, 19 Oct 2007 09:31:34 -0500
>From: "Larry Burke" <firstname.lastname@example.org>
>Subject: RE: [TowerTalk] Galvanized grade 8 bolts
>Frank... Do Grade 8's have EIGHT radial lines on the head or do they have
>[mailto:email@example.com] On Behalf Of
>Sent: Friday, October 19, 2007 9:26 AM
>Subject: Re: [TowerTalk] Galvanized grade 8 bolts
>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
>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
>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.
>---- Original message ----
>>Date: Thu, 18 Oct 2007 13:13:18 -0700 (PDT)
>>From: Jeff Walker <firstname.lastname@example.org>
>>Subject: [TowerTalk] Galvanized grade 8 bolts
>>Galvanized grade 8 bolts are available in bulk at a VERY reasonable
>>Gulf Coast Fasteners, Inc.
>>1626 Town Hurst
>>Houston, Texas 77043
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