Welding Neck Flange Dimensions

Welding Neck Flange Bores

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Nom. pipe Size	Outside Diam	Light Wall 6	Sched. 20	Sched. 30	Std. Wall	Sched. 40	Sched. 60	Extra Strong	Sched. 80	Sched. 100	Sched. 120	Sched. 140	Sched. 160	Double Extra Strong
1/2 3/4 1	0.840 1.050 1.315	.674 .884 1.097	— — —	— — —	0.622 0.824 1.049	0.622 0.824 1.049	— — —	0.546 0.742 0.957	0.546 0.742 0.957	— — —	— — —	— — —	0.464 0.612 0.815	0.252 0.434 0.599
1-1/4 1-1/2 2	1.660 1.900 2.375	1.442 1.682 2.157	— — —	— — —	1.380 1.610 2.067	1.380 1.610 2.067	— — —	1.278 1.500 1.939	1.278 1.500 1.939	— — —	— — —	— — —	1.160 1.338 1.687	0.896 1.100 1.503
2-1/2 3 3-1/2	2.875 3.500 4.000	2.635 3.260 3.760	— — —	— — —	2.469 3.068 3.548	2.469 3.068 3.548	— — —	2.323 2.900 3.364	2.323 2.900 3.364	— — —	— — —	— — —	2.125 2.624 —	1.771 2.300 2.728
4 5 6 8	4.500 5.563 6.625 8.625	4.260 5.295 6.357 8.329	— — — 8.125	— — — 8.071	4.026 5.047 6.065 7.981	4.026 5.047 6.065 7.981	— — — 7.813	3.826 4.813 5.761 7.625	3.826 4.813 5.761 7.625	— — — 7.437	3.624 4.563 5.501 7.187	— — — 7.001	3.438 4.313 5.187 6.813	3.152 4.063 4.897 6.875
10 12 14 16	10.750 12.750 14.000 16.000	10.420 12.390 13.500 15.500	10.250 12.250 13.376 15.376	10.136 12.090 13.250 15.250	10.020 12.000 13.250 15.250	10.020 11.938 13.124 15.000	9.750 11.626 12.812 14.688	9.750 11.750 13.000 15.000	9.562 11.374 12.500 14.312	9.312 11.062 12.124 13.938	0.062 10.750 11.814 13.564	8.750 10.500 11.500 13.124	8.500 10.500 11.500 13.124	8.750 10.750 — —
18 20 24	18.000 20.000 24.000	17.500 19.500 23.500	17.376 19.250 23.250	17.124 19.000 22.876	17.250 19.250 23.250	16.876 18.812 22.624	16.500 18.376 22.062	17.000 19.000 23.000	16.124 17.938 21.562	15.688 17.438 20.938	15.250 17.000 20.376	14.876 16.500 19.876	14.438 16.062 19.312	— — —
30 36 42	30.000 36.000 42.000	29.376 35.376 —.	29.000 35.000	28.750 34.750	29.250 35.250 41.250	— 34.500 —	— — —	29.000 35.000 41.000	— — —	— — —	— — —	— — —	— — —	— — —

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