ANSI B16.5 Class 150 Welding Neck Flanges

- All dimensions are in inches.
- Standard Bore will be furnished unless otherwise specified.
- These flanges will be furnished with a 1/16″ raised face unless otherwise specified.
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Nominal Pipe Size	Outside Diameter (O)	Bolt Circle (W)	Raised Face Diameter (R)	Number of Holes	Diameter of Holes	Bore (B)	Point of Weld (A)	Hub Diameter (X)	Thickness (T)	Length Thru Hub (Y)	Approximate Weight (lbs)
1/2	3.50	2.38	1.38	4	0.62	0.62	0.84	1.19	0.38	1.81	2
¾	3.88	0.44	0.50	1.69	1.50	0.62	2.75	1.09	0.82	1.11	1.05
1	4.25	0.50	0.56	2.00	1.94	0.62	3.12	1.36	1.05	1.38	1.32
1¼	4.62	0.56	0.62	2.50	2.31	0.62	3.50	1.70	1.38	1.72	1.66
1½	5.00	0.62	0.69	2.88	2.56	0.62	3.88	1.95	1.61	1.97	1.90
2	6.00	0.69	0.75	3.62	3.06	0.75	4.75	2.44	2.07	2.46	2.38
2½	7.00	0.81	0.88	4.12	3.56	0.75	5.50	2.94	2.47	2.97	2.88
3	7.50	0.88	0.94	5.00	4.25	0.75	6.00	3.57	3.07	3.60	3.50
3½	8.50	0.88	0.94	5.50	4.81	0.75	7.00	4.07	3.55	4.10	4.00
4	9.00	0.88	0.94	6.19	5.31	0.75	7.50	4.57	4.03	4.60	4.50
5	10.00	0.88	0.94	7.31	6.44	0.88	8.50	5.66	5.05	5.69	5.56
6	11.00	0.94	1.00	8.50	7.56	0.88	9.50	6.72	6.07	6.75	6.63
8	13.50	1.06	1.12	10.62	9.69	0.88	11.75	8.72	7.98	8.75	8.63
10	16.00	1.12	1.19	12.75	12.00	1.00	14.25	10.88	10.02	10.92	10.75
12	19.00	1.19	1.25	15.00	14.38	1.00	17.00	12.88	12.00	12.92	12.75
14	21.00	1.31	1.38	16.25	15.75	1.12	18.75	14.14	13.25	14.18	14.00
16	23.50	1.38	1.44	18.50	18.00	1.12	21.25	16.16	15.25	16.19	16.00
18	25.00	1.50	1.56	21.00	19.88	1.25	22.75	18.18	17.25	18.20	18.00
20	27.50	1.62	1.69	23.00	22.00	1.25	25.00	20.20	19.25	20.25	20.00
22	29.50	1.75	1.81	25.25	24.25	1.38	27.25	22.22	21.25	22.25	22.00
24	32.00	1.81	1.88	27.25	26.12	1.38	29.50	24.25	23.25	24.25	24.00