SAE Grade 5 Anchor Bolts 2

[skeletron]

Generally speaking: are any of you specifying "SAE Grade 5" bolts for your anchor bolts? I'm seeing that pop up on drawings and I'm puzzled only because any text/code references seem gravitate toward ASTM F1554. Contractor preference? Price decision? I'm not sure and it seems the general note on the drawings has been on there for eons (so, why change or update?)

 

[CWB1]

Sure am, fastener selection varies with application so unless you're required by the customer or regulatory body, use what is available and cost efficient.

 

[gtaw]

I would say it depends on the application. If it is for a building that complies with the building code, F1554 would probably be required. If you are anchoring a piece of equipment without a code requirement, then use what you want.

Best regards - Al

 

[phamENG]

I'd be careful about using automotive bolts for a structural application. The biggest difference is ductility. The Grade 5 may have nominally higher yield and tensile values, but the elongation at failure is only 14% where F1554 is 23% for Gr. 36 and 21% for Gr. 55. Going up to Gr. 105 it drops back down to be comparable to the Grade 5 bolt. Portland Bolt does a nice little comparison here.

 

[skeletron]

Thanks @phamEng. That's kind of what I was thinking too. The strength is higher, but the elongation is lower. The ductility is affected.

 

[moltenmetal]

What sizes are the bolts? Small bolts meeting structural specs can be hard to find. On our nonbuilding structures, everything 1/2" and smaller is SAE Gr 5.

 

[skeletron]

5/8" inch typically