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This topic has 3 replies, 3 voices, and was last updated 16 November 2009 at 23:55 by JohnF.

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30 October 2009 at 17:36 #44624
Richard Marks
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@richardmarks80868
Gentlemen

I know the difference between Whitworth,BSF,Metric and UN threads but what form are AF threads composed of, I know AF means across flats but there I am stuck.

Regards

Dick
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30 October 2009 at 17:36 #4815
Richard Marks
Participant
@richardmarks80868
30 October 2009 at 17:53 #44625
JasonB
Moderator
@jasonb
There is no AF thread, but it is sometimes wrongly used as an abreviation for “American Fine ” which should be refered to as “National Fine” for which the abbreviation is NF or UNF

AF is as you say a referance to the accross flats size of the bolt or nut hex head.

Jason

Edited By JasonB on 30/10/2009 17:54:14
16 November 2009 at 23:55 #45176
JohnF
Participant
@johnf59703
Have a look at this–someone else posted it on a nothe rpost and i came across it by chance!

http://www.gewinde-normen.de/en/index.html
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