Eric,
Here are a few head markings. Pardon the simple graphics using
text. If you need more information check out ANSI B18.2.I Appendix III. A
library may have a copy.
v/r,
Joe AG4BW
No Mark - SAE Grade 1
ASTM A307
SAE Grade 2
| ASTM A449
/ \ SAE Grade 5
\|/ SAE Grade 5.2
|
A325 ASTM A325
/ \ Type I
\|/ ASTM A325
A325 Type II
A325 ASTM A325
---- Type III
BC ASTM A354
Grade BC
\ /
/ \ SAE Grade 7
|
\|/ SAE Grade 8
/|\ ASTM A354 Grade BD
\|/
- - SAE Grade 8.2
(Should be
6 lines)
A490 ASTM A490
Type I
A490 ASTM A490
---- Type III
> I'm looking for information that will help me decode the letter codes
> printed on large (and small) bolt heads.
>
> I found a reference to a site here on Towertalk from 1997, but that
> site is long gone.
>
> Can anyone help?
>
> Thanks, in advnace,
>
> Eric W3DQ
> Washington, DC
>
> _______________________________________________
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>
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