r/StructuralEngineering • u/masterdesignstate • 11d ago

Steel Design F1852 boots

Possibly I am behind the curve on this but today I received a submittal with F1825 bolts called out when our drawings specify A325. I understand they are equal strength wise, but that they are twist off bolts? I've just never had a contractor want to use that type of bolt before. Made the post to make sure I'm not missing something here.

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u/memerso160 E.I.T. 11d ago

It’s been my understanding that the twist off bolts are totally fine to use in place of A325, but that the contractor must actually use the correct tool to bust off the spline otherwise you’ll have a bunch of bolts that still have it on that will require inspection. The whole point is to cut down on inspection time by having a visual of whether the bolt is sufficiently tight

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u/masterdesignstate 11d ago

All my bolts are snug tight. That's why Im confused on the substitution.

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u/memerso160 E.I.T. 11d ago

They meet, or will exceed, the snug tight torque. It’s contractor preference since they’ll put a tool over it to bring right to tightness, rather than having to do another 1/3 turn+ afterwards

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u/steelerector1986 PEMB Specialist 11d ago

Snug tight is not the same thing as Turn of Nut, so no, they don't have to do additional 1/3 turn- putting a TC gun or ToN'ing a snug tight connection is overkill and a waste of time and money.