[TowerTalk] matching bolt grades to the application

[Barry Kutner]

On  9 Oct 97, Don Moman <ve6jy@freenet.edmonton.ab.ca> wrote:

> My choice would be likely the grade 5 bolts, a good compromise between
> strength and brittleness. Gr 8 is very strong but in some cases will fail
> where a Gr 5 won't - I routinely lost 1/2 inch Gr 8's in a pinned mast
> (using 2 of them) turning a large log periodic and replaced with Gr 5 and
> they have lasted 5 years or so. They may be slightly deformed at the shear
> pressure points but they don't break clean like the Gr 8 ones did. 
> 
Could someone out in towertalk-land explain the coding on the head of 
a bolt to know what exactly it is? Tnx/Barry

--
Barry Kutner, W2UP              Internet: w2up@itw.com
Newtown, PA         FRC         alternate: barry@w2up.wells.com

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