Designing with Grade 2 or Grade 5 Bolts

[DHKpeWI]

Can the principles of bolt design in the AISC Manual be applied to Grade 2 and Grade 5 Bolts?

The 13th Edition specifically mentions A307, A325, A449, A490 and F1852 bolts, but nothing about other grades.

Are there specifications or design guides for Grade 2 and Grade 5 Bolts?

Thanks.

 

[nutte]

Grade 5 bolts have the same yield and tensile stresses as A325 bolts. So you could use the A325 allowables when designing with Grade 5 bolts.

I believe (but I'm not certain) that the strength of Grade 2 bolts is similarly equal to those for A307 bolts. There is a difference in that the A307 does not have a specified yield stress, only a specified tensile stress, while the Grade 2 bolt has both.

 

[nutte]

Some more information from a reference I have.

Grade 2 may be used as an alternate for ASTM A307 Grade A.

Grade 5 will also meet other specifications such as ASTM A449.

Grade 8 will also meet ASTM specification A354 Grade BD.

All of these are listed in the 13th edition manual.

 

[weab]

When you say grade 8, are you speaking of 8MPa, etc? I thought grade 8 is equal to A325 and Grade 5 is A307, but perhaps my terminology is off.

 

[sandman21]

From AISC's A Guide to Engineering and Quality Criteria: Common Questions Answered,

"6.2.5. Is it acceptable to substitute SAE J429 grades 5 and 8 bolts for ASTM A325 and A490 bolts, respectively?

No. The strength properties of SAE J429 grade 5 bolts and ASTM A325 bolts are identical; likewise, SAE J429 grade 8 bolts are the strength equivalent of ASTM A490 bolts. These material specifications differ, however, in that ASTM A325 and A490 specify thread length and head size, whereas SAE J429 does not. Additionally, quality assurance and inspection requirements for ASTM A325 and A490 bolts are more stringent."

I know if I ever saw a grade 2, 5, 8, f911 bolt on a project I would flip out.

 

[DHKpeWI]

Thanks nutte. What is the reference you have?


Sandman:

Is the "Guide to Engineering and Quality Criteria" on the AISC web site? Do you know the link?

Thanks

 

[nutte]

It's of the "photocopy of a fax of a photocopy from almost 20 years ago" variety. I'm not sure the original source.

 

[jberg]

DHKpeWI:

If it helps, the Modern Steel Construction link is:

http://www.modernsteel.com/steelinterchange_details.php?id=487

JWB