THREAD 1/8 x 27 PTF (SAE J534)
A. 1-3/4″
B. 1-1/4″
C. 7/32″
Hex size. 7/16″
Material. 1215
Zinc Finish. Yellow/Clear
Type. Straight

The 1/8”x 27 PTF should be assembled into 1/8”x27 NPT threaded hole.