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NPT Size Guide

NPT - American Standard Pipe Thread/Taper Guide:

NPT is not a measured size, but rather an industry call out size.
The NPT call out designation is not the true thread diameter inside or out.

PROBE SIZE

ACTUAL OUTSIDE DIAMETER (INCHES)

1/8" NPT 0.405" (Approx. 13/32")
1/4" NPT 0.540" (Approx. 1/2")
3/8" NPT 0.675" (Approx. 5/8")
1/2" NPT 0.840" (Approx. 7/8")
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