ANSI / ASME B16.5 Class 900 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	4.75	0.88	1.38	1.25	1.50	4	3.25	4	0.88
3/4	5.13	1.00	1.69	1.38	1.75	5	3.50	4	0.88
1	5.88	1.13	2.00	1.63	2.06	8	4.00	4	1.00
1 1/4	6.25	1.13	2.50	1.63	2.50	9	4.38	4	1.00
1 1/2	7.00	1.25	2.88	1.75	2.75	12	4.88	4	1.13
2	8.50	1.50	3.63	2.25	4.13	25	6.50	8	1.00
2 1/2	9.63	1.63	4.13	2.50	4.88	36	7.50	8	1.13
3	9.50	1.50	5.00	2.13	5.00	26	7.50	8	1.00
4	11.50	1.75	6.19	2.75	6.25	53	9.25	8	1.25
5	13.75	2.00	7.31	3.13	7.50	83	11.00	8	1.38
6	15.00	2.19	8.50	3.38	9.25	110	12.50	12	1.25
8	18.50	2.50	10.63	4.00	11.75	170	15.50	12	1.50
10	21.50	2.75	12.75	4.25	14.50	245	18.50	16	1.50
12	24.00	3.13	15.00	4.63	16.50	325	21.00	20	1.50
14	25.25	3.38	16.25	5.13	17.75	400	22.00	20	1.63
16	27.75	3.50	18.50	5.25	20.00	425	24.25	20	1.75
18	31.00	4.00	21.00	6.00	22.25	600	27.00	20	2.00
20	33.75	4.25	23.00	6.25	24.50	730	29.50	20	2.13
24	41.00	5.50	27.25	8.00	29.50	1400	35.50	20	2.63

*Use 25.4 as a factor to convert into mm.