[pianotech] nose bolt cap nuts

[William Monroe]

David and Tom (back-to-bed) Driscoll,

Thanks for the help guys.  I just remeasured, and it looks more likely that
these are 8mm x 1.25tpi.  I guess I didn't do my research fully enough.  I
just pulled out the imperial measurements, and everything seemed to fit.
Machine shop stuff isn't my forte, so I didn't suspect anything out the
ordinary with a 5/16" x 20tpi.  I am now a little better educated.  Thanks.
So, if anyone has three 8mm x 1.25tpi nose bolt nuts that would accomodate
about a 3/8" projection through the plate.......

William R. Monroe


On Sun, Oct 4, 2009 at 7:49 AM, Tom Driscoll <tomtuner at verizon.net> wrote:

>  Does anyone have or know where I can get three 5/16" x 20tpi Nose bolt
> cap nuts?  The originals were lost and so far I've struck out at supply
> houses.  Any help would be appreciated.
>
> William R. Monroe
>
> William,
> I just checked the bolt depot.
> And the closest they list is 5/16th -18tpi. I wonder if you could tap 20tpi
> into one of these. When Joe Garrett gets up (west coast ) he will tell me
> if I'm nuts for suggesting this.
>
> I just checked their metric to US conversion table and 8 MM has 5/16ths as
> it's closest equivalent but I'm not sure about the TPI issue.
> Maybe this chart below can help along with the bolt depot links .
>    A- 1.25
> B- 1.41
> C- .79375
>  A metric pitch is the distance in mm between successive crests, not the
> number of threads per unit length as in the old imperial system.
> A. Divide 1.25 mm by 25.4 mm/inch to get 0.049212598 inches per thread, and
> invert that to get 20.32 threads per inch.
>
> B. Divide 1.41 mm by 25.4 mm/inch to get 0.055511811 inches per thread, and
> invert that to get 18.01 threads per inch.
>
> C. Divide .79375 mm by 25.4 mm/inch to get 0.03125 inches per thread, and
> invert that to get 32 threads per inch.
>
>
> http://www.boltdepot.com/product.aspx?cc=7&cs=60&cm=6
>
>
> http://www.boltdepot.com/fastener-information/US-Metric-Conversion-Table.aspx
>
> http://www.boltdepot.com/product.aspx?cc=15&cs=112&cm=19
>
> Tom- Going back to bed --Driscoll
>
>
>
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