[Public-list] Shaft zinc

[isobar at bcpl.net]

Bob... I think that's a misprint in the catalog you referenced. T here is 
only one value for threads/inch for any given diameter in a thread series, 
which is a class of threads for various strengths & tolerences. So, a NC 
(National Coarse) 5/8 bolt would bve 11 threads per inch. I'm pretty sure 
the threads for an Alberg 7/8 shaft are NC, so you'd want the 11 TPI.  I'll 
be the other  part number  for 18 TPI is a misprint fo the NF (National 
Fine) finer thread series. Notice the other NF threads further down the table.

Bob Kirk
Isobar #181


Bob Crinion wrote:
>Here is a link to Electro Guard.
>http://www.egzincs.com/retail_propeller_nuts.html
>
>On this site there are two 7/8 prop nut part numbers:
>
>PNRH-2004   5/8-11 NC
>PNRH-2005   5/8-18 NC
>
>What does 5/8-11 NC and 5/8-18 NC indicate?
>
>Does anyone know which one I would need for my A30 with 7/8' shaft?


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