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Can some one explain me what will t
2

Can some one explain me what will t

Can some one explain me what will t

(OP)
Can some one explain me what will be the reasons behind, when someone asks the bolt threads should be included in the shear plane. I hope the Thread excluded in the shear plain will be much stronger connection than included one. And the price of half thread bolts are cheaper than full thread bolts.

RE: Can some one explain me what will t

I know of no reason to ask to have the bolt threads included in the shear plane. The only thing I could possibly think is if they wanted to reuse the bolts for something else and needed more thread. I certainly assume that bolts have the threads in the shear plane as a conservative assumption but why you would ask for that condition is a mystery to me.

Professional and Structural Engineer (ME, NH)
American Concrete Industries
www.americanconcrete.com

RE: Can some one explain me what will t

IF this is just the standard "A325N vs. A325X", it's just a conservative assumption that the threads (and thus a smaller shear area) will be present in the faying surface. Otherwise careful detailing, installation, and inspection are required to verify that the threads do not project into the shear plane.

You're not requiring they be included, but you are designing for the chance that they might be.

RE: Can some one explain me what will t

If you are bolting up two dissimilar thicknesses when you use A325-X you need to make sure the bolt is being installed in the correct direction, not necessarily a trivial process in the field given wrench clearances, etc. The PEB industry tends to use A325T bolts (which are fully threaded to the head) because it minimizes the number of unique lengths that need to be stocked in the plants. An A325T bolt can be a bit longer and not worry about the threads not being too short to get the nut fully tightened. The A325T bolts are designed as an A325-N condition. In large quantities I would suspect the cost differential between a regular A325 and an A325T is minimal. A325T bolts are available up to a bolt length of four times the diameter, longer than that the regular A325 bolt is required.

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