对边宽度
emin 32.95 smax 30 smin 29.16 mm
M12
P 1.75 emin 20.03 kmax 10.8 kmin 10.37 smax 18 smin 17.73
M14
P 2 emin 23.36 kmax 12.8 kmin 12.1 smax 21 smin 20.67
M16
P 2 emin 26.75 kmax 14.8 kmin 14.1 smax 24 smin 23.67
M18
P 2.5 emin 29.56 kmax 15.8 kmin 15.1 smax 27 smin 26.16
M 20
P 2.5 emin 32.95 kmax 18 kmin 16.9 smax 30 smin 29.16