"Grant Erwin" wrote in message
...
You know, my eyes aren't what they used to be. I'm now wondering if
this could be an 11-1 metric thread, which would of course equate to
25.4
tpi. Maybe 26 was just a hair too fine too, and I got it wrong. -
GWE



Could be- have industry standard thermocouple fittings that appear to
be 11X1mm on the sealing gland end. As another poster indicated, 11mm
is a common size for engine head bolts (and some main bearing cap
bolts, too)...