Dimensions Threaded Full & Half Couplings - ASME B16.11

Dimensions NPS 1/2 to 4 - Class 3000

NPS End to End Outside
Diameter
Minimum
Length
of Thread
A D B J
1/2 48 28 10.9 13.6
3/4 51 35 12.7 13.9
1 60 44 14.7 17.3
67 57 17 18
79 64 17.8 18.4
2 86 76 19 19.2
92 92 23.6 28.9
3 108 108 25.9 30.5
4 121 140 27.7 33
NPS A D B J
End to End Outside
Diameter
Minimum
Length
of Thread
Threaded Full and Half-Couplings

Dimensions NPS 1/2 to 4 - Class 6000

NPS End to End Outside
Diameter
Minimum
Length
of Thread
A D B J
1/2 48 38 10.9 13.6
3/4 51 44 12.7 13.9
1 60 57 14.7 17.3
67 64 17 18
79 76 17.8 18.4
2 86 92 19 19.2
92 108 23.6 28.9
3 108 127 25.9 30.5
4 121 159 27.7 33
NPS A D B J
End to End Outside
Diameter
Minimum
Length
of Thread
Threaded Full and Half-Couplings

General notes:
  • Dimensions are in millimeters unless otherwise indicated.
  • Dimension (B) is minimum length of perfect thread.
    The length of useful thread (B plus threads with fully formed roots and flat crests) shall not be less than J.