ANSI / ASME B16.5 Class 600 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	3.75	0.56	1.38	2	2.63	4	0.63
3/4	4.63	0.63	1.69	3	3.25	4	0.75
1	4.88	0.69	2.00	4	3.50	4	0.75
1 1/4	5.25	0.81	2.50	5	3.88	4	0.75
1 1/2	6.13	0.88	2.88	8	4.50	4	0.88
2	6.50	1.00	3.63	10	5.00	8	0.75
2 1/2	7.50	1.13	4.13	15	5.88	8	0.88
3	8.25	1.25	5.00	20	6.63	8	0.88
3 1/2	9.00	1.38	5.50	29	7.25	8	1.00
4	10.75	1.50	6.19	41	8.50	8	1.00
5	13.00	1.75	7.31	68	10.50	8	1.13
6	14.00	1.88	8.50	86	11.50	12	1.13
8	16.50	2.19	10.63	140	13.75	12	1.25
10	20.00	2.50	12.75	230	17.00	16	1.38
12	22.00	2.63	15.00	295	19.25	20	1.38
14	23.75	2.75	16.25	355	20.75	20	1.50
16	27.00	3.00	18.50	495	23.75	20	1.63
18	29.25	3.25	21.00	630	25.75	20	1.75
20	32.00	3.50	23.00	810	28.50	24	1.75
22	34.25	3.75	25.25	1000	30.63	24	1.88
24	37.00	4.00	27.25	1250	33.00	24	2.00

*Use 25.4 as a factor to convert into mm.