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RE: Grade 8 bolt properties

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Harold,

Thank you for the links.

Joe

 

From: Harold Sprague [mailto:spraguehope(--nospam--at)hotmail.com]
Sent: Monday, November 23, 2009 3:18 PM
To: seaint(--nospam--at)seaint.org
Subject: RE: Grade 8 bolt properties

 

Joe,
 
Contact the IFI regarding the MSCR.
http://www.industrial-fasteners.org/contact_us.html
 
You need to page through the NASA RS 1228
http://gltrs.grc.nasa.gov/reports/1990/RP-1228.pdf
 
It has a good section in the back regarding ASTM and SAE. 

Regards, Harold Sprague


 


From: jrgrill(--nospam--at)cableone.net
To: seaint(--nospam--at)seaint.org
Subject: Grade 8 bolt properties
Date: Mon, 23 Nov 2009 11:22:04 -0700

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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