[modeleng] Re: unknown thread
- From: peter.chadwick@xxxxxxxxxxx
- To: modeleng@xxxxxxxxxxxxx
- Date: Fri, 15 Oct 2004 13:03:33 +0200
Can anyone explain how/why the different thread angles appeared? I thought
it was accepted that the first 'standardised' thread was BSW, which is a
55 degree thread, and this was followed by BSF, also a 55 degree. When and
why did the 60 degree of US standard and metric appear? For that matter,
why 47.5 degrees for BA/Thrury ?
Peter Chadwick
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