ANSI / ASME B16.47 Series A Class 300 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
26	38.25	3.31	29.50	1079	34.50	28	1.75
28	40.75	3.56	31.50	1315	37.00	28	1.75
30	43.00	3.75	33.75	1545	39.25	28	1.88
32	45.25	3.94	36.00	1795	41.50	28	2.00
34	47.50	4.12	38.00	2068	43.50	28	2.00
36	50.00	4.38	40.25	2435	46.00	32	2.12
38	46.00	4.25	40.50	2001	43.00	32	1.62
40	48.75	4.50	42.75	2380	45.50	32	1.75
42	50.75	4.69	44.75	2689	47.50	32	1.75
44	53.25	4.88	47.00	3079	49.75	32	1.88
46	55.75	5.06	49.00	3500	52.00	28	2.00
48	57.75	5.25	51.25	3896	54.00	32	2.00
50	60.25	5.50	53.50	4442	56.25	32	2.12
52	62.25	5.69	55.50	4906	58.25	32	2.12
54	65.25	6.00	57.75	5684	61.00	28	2.38
56	67.25	6.06	59.75	6099	63.00	28	2.38
58	69.25	6.25	62.00	6669	65.00	32	2.38
60	71.25	6.44	64.00	7274	67.00	32	2.38

*Use 25.4 as a factor to convert into mm.