ANSI / ASME B16.47 Series B Class 400 Blind Flange Dimensions

Nominal Pipe Size	Outside Diameter (O)	Min Thickness (T)	Raised Face Diameter (R)	Approximate Weight (lbs)	Bolt Circle (C)	Number of Holes	Diameter of Holes
26	38.25	3.88	29.50	1263	34.50	28	1.88
28	40.75	4.12	31.50	1520	37.00	28	2.00
30	43.00	4.38	33.75	1802	39.25	28	2.12
32	45.25	4.56	36.00	2075	41.50	28	2.12
34	47.50	4.81	38.00	2415	43.50	28	2.12
36	50.00	5.06	40.25	2815	46.00	32	2.12
38	47.50	4.88	40.75	2450	44.00	32	1.88
40	50.00	5.12	43.00	2849	46.25	32	2.00
42	52.00	5.25	45.00	3160	48.25	32	2.00
44	54.50	5.50	47.25	3635	50.50	32	2.12
46	56.75	5.75	49.50	4120	52.75	36	2.12
48	59.50	6.00	51.50	4725	55.25	28	2.38
50	61.75	6.25	53.62	5303	57.50	32	2.38
52	63.75	6.44	55.62	5823	59.50	32	2.38
54	67.00	6.75	57.88	6742	62.25	28	2.62
56	69.00	6.94	60.12	7352	64.25	32	2.62
58	71.00	7.12	62.12	7986	66.25	32	2.62
60	74.25	7.44	64.38	9126	69.00	32	2.88

*Use 25.4 as a factor to convert into mm.