NMTB Tapers
Taper Type
D1
D2
L1
L2
L3
L4
L5
L6
Thread
N30
1.250
1.825
2.687
0.344
0.421
0.905
0.640
0.645
1/2 - 13
N40
1.750
2.500
3.687
0.312
0.389
0.956
0.883
0.645
5/8 - 11
N50
2.750
3.900
5.000
0.640
0.765
1.000
1.382
1.013
1" - 8
See also
here.
