[Roadsters] Was cleaning carbs / Now pre-ISO threads

[Keith0alan at aol.com]

In a message dated 12/18/2007 6:58:59 P.M. Pacific Standard Time,  
hallosb at juno.com writes:

Pre-ISO  metric screws?? Never heard of such a thing. And I thought the
clutch head  screws on my '56 Chevy were unusual. 

This might explain those  impossible to find replacement screws.  When I
disassembled my heater  valve, I lost a screw I couldn't replace.  Same
thing happened with  the original alternator.  I have a thread gauge and
every once in a  while I find an unusual thread I can't match with any
standard sizes either  metric or SAE.

Most everything on my '66 is SAE but, it seems like some  of the parts do
use metric threads. Do our cars have a mixture of both SAE  and metric?

Dan McHatton
'66 1600



There a bunch of metric sizes that were dropped when the ISO standard was  
agreed upon. There was 5x.75, 5x.8 and 5x.9 in the 5mm size. 5x.8 is the current 
 standard. On the early roadsters, things Nissan assembled, bodies,  engines 
and such were SAE, usually fine thread. Stuff they purchased as an  assembly, 
carbs, gauges, tended to be metric. 
 
keith



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