That is a good point. The bolts are being shown to be 1/4" dia. The loads are light (for hanging some art work), less that 100 lbs per bolt in single shear using 3/16" or 1/4" plate. I wasn't too concerned. On the other hand is there a design reference that should be used in this case (and I probably don't have a copy anyway) in lieu of the AISC? Or possibly some shear design tables out of a reference that could be used.?
Joe
-----Original Message-----
From: Gary L. Hodgson and Assoc. [mailto:design@hodgsoneng.ca]
Sent: Tuesday, November 24, 2009 5:58 AM
To: seaint@seaint.org
Subject: Re: Grade 8 bolt properties
Joe,
I don't know what the intended use of your bolts, but remember that the
AISC specification only refers to 3 kinds of bolts for structural
purposes and machine bolts of grade 8 or 8.8 spec don't comply. Of
course, if the bolts are under 1/2" you may have to use machine bolts.
I have one customer who keeps wanting to use the nice shiny SAE grade 8
bolts because they look better than those black A325 or A490 bolts.
Gary
>
>
>
> 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 part will be drilled
>> and tapped. But what does the "MSCR" stand for? Sorry for the
>> confusion here. And, what would the correct ASTM designation be?
>> Same as above for the bolts as the table I found from American
>> Fastener shows ASTM A#%$ Grade BD being for Bolts, Screws, and Studs.
>>
>>
>>
>> Thanks for the help
>>
>>
>>
>> Joe Grill
>>
>>
>>
>>
>
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