ANSI / ASME B16.47 Series B Class 75 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	30.00	1.31	27.75	255	28.50	36	0.75
28	32.00	1.31	29.75	290	30.50	40	0.75
30	34.00	1.31	31.75	330	32.50	44	0.75
32	36.00	1.44	33.75	390	34.50	48	0.75
34	38.00	1.50	35.75	430	36.50	52	0.75
36	40.69	1.67	38.00	520	39.06	40	0.88
38	42.69	1.75	40.00	595	41.06	40	0.88
40	44.69	1.75	42.00	760	43.06	44	0.88
42	46.69	1.88	44.00	895	45.06	48	0.88
44	49.25	1.94	46.25	1065	47.38	36	1.00
46	51.25	2.00	48.25	1185	49.38	40	1.00
48	53.25	2.12	50.25	1315	51.38	44	1.00
50	55.25	2.18	52.25	1505	53.38	44	1.00
52	57.38	2.25	54.25	1665	55.50	48	1.00
54	59.38	2.38	56.25	1840	57.50	48	1.00
56	62.00	2.44	58.50	2111	59.88	40	1.12
58	64.00	2.50	60.50	2300	61.88	44	1.12
60	66.00	2.62	62.50	2500	63.88	44	1.12

*Use 25.4 as a factor to convert into mm.