ANSI / ASME B16.5 Class 900 Blind Flange Dimensions

Nominal Pipe Size	Outside Diameter (O)	Thickness (T)	Raised Face Diameter (R)	Approximate Weight (lbs)	Bolt Circle (C)	Number of Holes	Diameter of Holes
1/2	4.75	0.88	1.38	4	3.25	4	0.88
3/4	5.13	1.00	1.69	6	3.50	4	0.88
1	5.88	1.13	2.00	8	4.00	4	1.00
1 1/4	6.25	1.13	2.50	9	4.38	4	1.00
1 1/2	7.00	1.25	2.88	13	4.88	4	1.13
2	8.50	1.50	3.63	25	6.50	8	1.00
2 1/2	9.63	1.63	4.13	35	7.50	8	1.13
3	9.50	1.50	5.00	29	7.50	8	1.00
4	11.50	1.75	6.19	54	9.25	8	1.25
5	13.75	2.00	7.31	87	11.00	8	1.38
6	15.00	2.19	8.50	115	12.50	12	1.25
8	18.50	2.50	10.63	200	15.50	12	1.50
10	21.50	2.75	12.75	290	18.50	16	1.50
12	24.00	3.13	15.00	415	21.00	20	1.50
14	25.25	3.38	16.25	520	22.00	20	1.63
16	27.75	3.50	18.50	600	24.25	20	1.75
18	31.00	4.00	21.00	850	27.00	20	2.00
20	33.75	4.25	23.00	1075	29.50	20	2.13
24	41.00	5.50	27.25	2025	35.50	20	2.63

*Use 25.4 as a factor to convert into mm.