[Shop-talk] Weird machine screw

[Mike Rambour]

Witworth metric or BSF (British Standard Fine)  ?

   mike

Mark Andy wrote:
> Howdy,
>
> Ok, I've been sorting out my nuts and bolts.
>
> What can I say, I'm an exciting person.
>
> However, I've run across a mystery bolt.  Its got 32 tpi, but the 
> diameter (thread peak to peak) is ~0.147".  That's too big for a 6-32 
> (max is 0.137) and not big enough for 8-32 (min is 0.157).
>
> Did they make a 7-32 thread?
>
> Its possible its metric (though the 32 thread guage fits really well) 
> I suppose, but the common sizes in that range are 3.5x0.6 (diameter 
> converts to 0.138") or 4x.7 (diameter converts to 0.157").
>
> This make sense to anyone?
>
> Mark