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OT: ASTM A-325 & ASTM A-563DH

An off topic question for some of use, but might be easy to answer for a lot off you….

As being raised in a metric world with DIN normalized bolts and nuts, we have to do a project with imperial fixings.

 

If we have a DIN bolt (or nut) which is hot dip galvanized, these will be undercut (or overcut) on the thread during fabrication, resulting in nominal dimension on the thread after galvanizing.

How is this done with the mentioned ASTM bolts?

If been searching the internet, but cannot find a defined answer….. Is the thread cut on nominal dimensions, resulting in an oversized bolt after galvanizing? It the thread undercut in the same way as it is done with the DIN bolts?

 

Any help, even if it is a link to a website, would be helpful….

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Marc Boom
marc.boom@eurotechbenelux.com
www.eurotechbenelux.com / www.quayquip.com
4 REPLIES

Re: OT: ASTM A-325 & ASTM A-563DH

The spec is ASTM A153 for galvanized bolting, I want to say they are undermachined about 1.5-2 mil's to allow for the galv coating.

Re: OT: ASTM A-325 & ASTM A-563DH

For those kinds of details. The only official rout is to purchase relavent ANSI/ASME codes, and many of them. The cross reference you to death and want cash for the real standards.

Re: OT: ASTM A-325 & ASTM A-563DH

Thanks for the replies.

 

Going into the cloud of referenced ASME/ANSI codes etc will only get me on a rollercoaster of diging... ;-).

 

WE have decided to simply order some parts whitout additonal specificaitons and will see how it ends.

 

 

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Marc Boom
marc.boom@eurotechbenelux.com
www.eurotechbenelux.com / www.quayquip.com

Re: OT: ASTM A-325 & ASTM A-563DH

ASME, ANSI, ASTM, SAE, DIN, ISO... etc. are all in the business of making money selling you specs. The more those specs crossreference each other the more they stand to make. Even more so when you need to get "revised" specs on a regular basis as the books are only valid for one year after the next revision comes out.