Quote:
Originally Posted by jimvette59
Pobody's Nerfect ! There are straight pipe threads look on a old thread chart. JMHO
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Good point! I had forgotten about that!!
Straight pipe threads are designated NPSC = National Pipe Straight Coupling.
Also generically referred to as "IPS Threads" or "Iron Straight Threads".
I remember reading a lot about the different brake pad threads years ago, but don't remember enough apparently!!!
There is a 1/4-18 & 3/8-18 specification for NPSC threads. Based on Don's post #6 a supplier may have used the NPSC spec.
There are NPSC nuts, I'm seeing them listed as NPT Straight. Looks like most are brass.