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Carbon and Stainless Steel Welding Neck Flange Bores

Flange bores of welding neck flanges according ASME/ANSI B16.5-1996 Pipe Flanges and Flanged Fittings

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Welding neck flange bores according ASME/ANSI B16.5-1996 Pipe Flanges and Flanged Fittings:

Welding Neck Flange Bores
Nominal Pipe Size
(inches)
Outside Diameter
(inches)
Inside Diameter (inches)
Light Wall 1)Schedule 20Schedule 30Standard WallSchedule 40Schedule 60
1/2 0.840 0.674 - - 0.622 0.622 -
3/4 1.050 0.884 - - 0.824 0.824 -
1 1.315 1.097 - - 1.049 1.049 -
1 1/4 1.660 1.442 - - 1.380 1.380 -
1 1/2 1.900 1.682 - - 1.610 1.610 -
2 2.375 2.157 - - 2.067 2.067 -
2 1/2 2.875 2.635 - - 2.469 2.469 -
3 3.500 3.260 - - 3.068 3.068 -
3 1/2 4.000 3.760 - - 3.548 3.548 -
4 4.500 4.260 - - 4.026 4.026 -
5 5.563 5.295 - - 5.047 5.047 -
6 6.625 6.357 - - 6.065 6.065 -
8 8.625 8.329 8.125 8.071 7.981 7.981 7.813
10 10.750 10.420 10.250 10.136 10.020 10.020 9.750
12 12.750 12.390 12.250 12.090 12.000 11.938 11.626
14 14.000 13.500 13.376 13.250 13.250 13.124 12.812
16 16.000 15.500 15.376 15.250 15.250 15.000 14.688
18 18.000 17.500 17.376 17.124 17.250 16.876 16.500
20 20.000 19.500 19.250 19.000 19.250 18.812 18.376
24 24.000 23.500 23.250 22.876 23.250 22.624 22.062
30 30.000 29.376 29.000 28.750 29.250 - -
36 36.000 35.376 35.000 34.750 35.250 34.500 -
42 42.000 - - - 41.250 - -
48 48.000 - - - 47.250 - -
  •  1 inch = 25.4 mm
Welding Neck Flange Bores
Nominal Pipe Size
(inches)
Outside Diameter
(inches)
Inside Diameter (inches)
Extra StrongSchedule 80Schedule 100Schedule 120Schedule 140Schedule 160Double Extra Strong
1/2 0.840 0.546 0.546 - - - 0.464 0.252
3/4 1.050 0.742 0.742 - - - 0.612 0.434
1 1.315 0.957 0.957 - - - 0.815 0.599
1 1/4 1.660 1.278 1.278 - - - 1.160 0.896
1 1/2 1.900 1.500 1.500 - - - 1.338 1.100
2 2.375 1.939 1.939 - - - 1.687 1.503
2 1/2 2.875 2.323 2.323 - - - 2.125 1.771
3 3.500 2.900 2.900 - - - 2.624 2.300
3 1/2 4.000 3.364 3.364 - - - - 2.728
4 4.500 3.826 3.826 - 3.624 - 3.438 3.152
5 5.563 4.813 4.813 - 4.563 - 4.313 4.063
6 6.625 5.761 5.761 - 5.501 - 5.187 4.897
8 8.625 7.625 7.625 7.437 7.187 7.001 6.813 6.875
10 10.750 9.750 9.562 9.312 9.062 8.750 8.500 8.750
12 12.750 11.750 11.374 11.062 10.750 10.500 10.126 10.750
14 14.000 13.000 12.500 12.124 11.814 11.500 11.188 -
16 16.000 15.000 14.312 13.938 13.564 13.124 12.812 -
18 18.000 17.000 16.124 15.688 15.250 14.876 14.438 -
20 20.000 19.000 17.938 17.438 17.000 16.500 16.062 -
24 24.000 23.000 21.562 20.938 20.376 19.876 19.312 -
30 30.000 29.000 - - - - - -
36 36.000 35.000 - - - - - -
42 42.000 41.000 - - - - - -
48 48.000 47.000 - - - - - -

1) Stainless steel Schedule 10S diameters are equal to Light Wall in sizes up to 12" and to Schedule 10 above.

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