ANSI / ASME B16.5 Class 150 Threaded Flange Dimensions

Nominal Pipe Size	Outside Diameter (O)	Thickness (T)	Raised Face Diameter (R)	Length Thru Hub (Y)	Hub Diameter (X)	Approximate Weight (lbs)	Bolt Circle (C)	Number of Holes	Diameter of Holes
1/2	3.50	0.44	1.38	0.63	1.19	1	2.38	4	0.63
3/4	3.88	0.50	1.69	0.63	1.50	2	2.75	4	0.63
1	4.25	0.56	2.00	0.69	1.94	2	3.13	4	0.63
1 1/4	4.63	0.63	2.50	0.81	2.31	3	3.50	4	0.63
1 1/2	5.00	0.69	2.88	0.88	2.56	3	3.88	4	0.63
2	6.00	0.75	3.63	1.00	3.06	5	4.75	4	0.75
2 1/2	7.00	0.88	4.13	1.13	3.56	7	5.50	4	0.75
3	7.50	0.94	5.00	1.19	4.25	8	6.00	4	0.75
3 1/2	8.50	0.94	5.50	1.25	4.81	11	7.00	8	0.75
4	9.00	0.94	6.19	1.31	5.31	13	7.50	8	0.75
5	10.00	0.94	7.31	1.44	6.44	15	8.50	8	0.88
6	11.00	1.00	8.50	1.56	7.56	19	9.50	8	0.88
8	13.50	1.13	10.63	1.75	9.69	30	11.75	8	0.88
10	16.00	1.19	12.75	1.94	12.00	43	14.25	12	1.00
12	19.00	1.25	15.00	2.19	14.38	64	17.00	12	1.00
14	21.00	1.38	16.25	2.25	15.75	90	18.75	12	1.13
16	23.50	1.44	18.50	2.50	18.00	98	21.25	16	1.13
18	25.00	1.56	21.00	2.69	19.88	130	22.75	16	1.25
20	27.50	1.69	23.00	2.88	22.00	165	25.00	20	1.25
22	29.50	1.81	25.25	3.13	24.25	185	27.25	20	1.38
24	32.00	1.88	27.25	3.25	26.13	220	29.50	20	1.38

*Use 25.4 as a factor to convert into mm.