Reading ETKA hardware #s

[mike]

a few months ago i was moving a linn bin board at work
and dropped it, 8' x 4' of bins of fastenings onto the
floor

kept the apprentice busy for 3 days

mike --- Jim Haseltine <Jim at ur-q.freeserve.co.uk>
wrote: > 
> ----- Original Message -----
> From: "Huw Powell" <audi at mediaone.net>
> > > >
> > >
> > > > N 011 445 7   Hex bolt (M10x45x20)
> > > > 10mm dia, 45mm long, 2.0 pitch?
> >
> > I think the "20" refers to an unthreaded portion
> of the bolt.  to the
> > best of my peering the fiche/etka never seemed to
> specify thread pitch.
> 
> Etka does specify thread pitch sometimes.
> 
> N 010 142 7  Hex bolt M12x1,5x50 = 50mm M12 bolt
> 1.5mm pitch.
> 
> The problem with metric 'M' sizing is that there is
> more than one 'fine'
> pitch.
> 
> Std 'M'
> M6 (6mm) - pitch 1.00mm
> M8 (8mm) - pitch 1.25mm
> M10 (10mm) - pitch 1.50mm
> M12 (12mm) - pitch 1.75mm
> 
> Fine 'M'
> M8 - pitch 1.00mm
> M10 - pitch 1.00mm
> M10 - pitch 1.25mm
> M12 - pitch 1.25mm
> M12 - pitch 1.5mm
> 
> So both M10 and M12 are available in 1 std and 2
> fine threads - imagine if
> you can, the fun I had after I had dropped a tray of
> 500 M8, 10 & 12 nuts.
> Segregation by size was no problem, but several
> hours of sorting threads by
> test screwing nuts on to known pitch bolts was a
> real PITA.
> 
> Additional point -
> Technically, a 'bolt' has unthreaded shank, if the
> threads are continuous
> it's a 'set screw'.
> 
> Regards,
> 
> Jim Haseltine
> 
> 
> 
>  

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