d

UNC

UNF

S

h

MIN

MAX

MIN

MAX

1/4

20

28

0.430

0.439

0.298

0.328

5/16

18

24

0.489

0.502

0.329

0.359

3/8

16

24

0.551

0.564

0.438

0.468

1/2

13

20

0.736

0.752

0.579

0.609