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Can socket head cap screws per A-574M be used in VIII-1 construction?

Can socket head cap screws per A-574M be used in VIII-1 construction?

Can socket head cap screws per A-574M be used in VIII-1 construction?

(OP)
Can socket head cap screws per A-574M be used in VIII-1 construction?

SA-574 is an approved specification in VIII-1, but SA-574M does not appear (at least in the 2007 version).  Can A-574M fasteners be used?

I am looking for a high strength fastener like a 12.9 graded fastener.  SA-193M (approved in the spec.) strength is not high enough.

Thanks.

RE: Can socket head cap screws per A-574M be used in VIII-1 construction?

beh188, Scope of A-574 says a companion metric spec exists, it would therefore appear to be permitted under U-4.

Regards,

Mike

RE: Can socket head cap screws per A-574M be used in VIII-1 construction?

No, U-4 only permits different units of measurement. A-574M has significant differences such as chemical composition and thread profile. Note that even A-574 is not fully identical to SA-574; the ASME version requires the chemistries from supplement 1.

So you definitely can't use A-574M with the basic 12.9 chemistry. But is there a way for the code to allow an SA-574 screw with a supplement 1 chemistry and an ASME B1.13 thread cut into it? I don't know. As far as I can tell, a strict legal reading would say no, but this sounds like the kind of thing that would have a loophole designed to allow it.

I don't know if such a loophole exists or not, but U-4 is not it.

RE: Can socket head cap screws per A-574M be used in VIII-1 construction?

beh188, stick with inch stuff, no worries:)

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