DIMENSIONS OF STAINLESS STEEL
WELD NECK FLANGE BORES

 

Nominal Pipe Size Outside Diameter Nominal Bore Diameter
Sch.5S Sch.10S Sch.10 Sch.20 Sch.30 Sch.40S Sch.40 Sch.60S Sch.80S Sch.80 Sch.100 Sch.120 Sch.140 Sch.160 XX Strong
1/2 0.840 .710 .674 .622 .622 .546 .546 .464 .252
3/4 1.050 .920 .884 .824 .824 .742 .742 .612 .434
1 1.315 1.185 1.097 1.049 1.049 .957 .957 .815 .599
1-1/4 1.660 1.530 1.442 1.380 1.380 1.278 1.278 1.160 .896
1-1/2 1.900 1.770 1.682 1.610 1.610 1.500 1.500 1.338 1.100
2 2.375 2.245 2.157 2.067 2.067 1.939 1.939 1.687 1.503
2-1/2 2.875 2.709 2.635 2.469 2.469 2.323 2.323 2.125 1.771
3 3.500 3.334 3.260 3.068 3.068 2.900 2.900 2.624 2.300
3-1/2 4.000 3.834 3.760 3.548 3.548 3.364 3.364
4 4.500 4.334 4.260 4.026 4.026 3.826 3.826 3.624 3.438 3.152
5 5.563 5.345 5.295 5.047 5.047 4.813 4.813 4.563 4.313 4.063
6 6.625 6.407 6.357 6.065 6.065 5.761 5.761 5.501 5.187 4.897
8 8.625 8.407 8.329 8.125 8.071 7.981 7.981 7.813 7.625 7.625 7.437 7.187 7.001 6.813 6.875
10 10.750 10.482 10.420 10.250 10.136 10.020 10.020 9.750 9.750 9.564 9.312 9.062 8.750 8.500
12 12.750 12.438 12.390 12.250 12.090 12.000 11.938 11.626 11.750 11.374 11.062 10.750 10.500 10.126
14 14.000 13.688 13.625 13.500 13.375 13.250 13.250 13.124 12.812 13.000 12.500 12.124 11.814 11.500 11.188
16 16.000 15.670 15.625 15.500 15.375 15.250 15.250 15.000 14.688 15.000 14.312 13.938 13.564 13.124 12.812
18 18.000 17.670 17.625 17.500 17.375 17.124 17.250 16.876 16.500 17.000 16.124 15.688 15.250 14.876 14.438
20 20.000 19.625 19.564 19.500 19.250 19.000 19.250 18.814 18.376 19.000 17.938 17.438 17.000 16.500 16.062
24 24.000 23.564 23.500 23.500 23.250 22.876 23.250 22.624 22.062 23.000 21.562 20.938 20.376 19.876 19.312
All dimensions are in inches.