"machine screw BLANK BLANK".
You are correct regarding the grade 8 - med. carbon alloy, quenched
and tempered. I would recommend keeping the SAE designation on the
drawings, as it is a fairly recognized standard, and easy to identify
when the builder goes to order them.
Brad
On Nov 23, 2009, at 10:22 AM, "Joseph R. Grill" <jrgrill@cableone.net>
wrote:
> I am working on a small project. Kind of a backwards design for
> some small steel brackets that are in the process of being
> detailed. The drawings the steel detailer call for Grade 8 1/4x20
> bolts. I have found some information on the internet. What I think
> should be called out should be ASTM A354 Grade BD (it appears that
> it is in the same category as SAE J429 Grade 8). It has a yield
> strength of 130 ksi and a tensile strength of 150 ksi. Am I correct?
>
>
>
> In addition, the shop drawings that are in production, call for a
> ¼"-20 FH MSCR in another application on the project. I can see
> that it will be a ¼" flat head screw (the drawings show a
> countersunk part for the application and I believe the receiving par
> t will be drilled and tapped. But what does the "MSCR" stand
> for? Sorry for the confusion here. And, what would the correct AST
> M designation be? Same as above for the bolts as the table I found
> from American Fastener shows ASTM A#%$ Grade BD being for Bolts, Scr
> ews, and Studs.
>
>
>
> Thanks for the help
>
>
>
> Joe Grill
>
>
>
>
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