THREAD 1/4 x 28 SAE LT (SAE J534)
A. 15/16″
B. 19/64″
C. 13/64″
Hex size. 3/8″
Material. 1215
Zinc Finish. Yellow/Clear
Type. 45°

The ¼”x28 SAE-LT Taper Threads should be assembled into ¼”x28 UNF class 3B, straight threaded hole with a mínimum of 75% thread height.