ANSI / ASME B16.47 Series B Class 150 Blind Flange Dimensions

Nominal Pipe Size	Outside Diameter (O)	Max Thickness (T)	Raised Face Diameter (R)	Approximate Weight (lbs)	Bolt Circle (C)	Number of Holes	Diameter of Holes
26	30.94	1.75	28.00	375	29.31	36	0.88
28	32.94	1.88	30.00	455	31.31	40	0.88
30	34.94	2.00	32.00	545	33.31	44	0.88
32	37.06	2.12	34.00	648	35.44	48	0.88
34	39.56	2.25	36.25	782	37.69	40	1.00
36	41.62	2.31	38.25	890	39.75	44	1.00
38	44.25	2.50	40.25	1090	42.12	40	1.12
40	46.25	2.62	42.50	1247	44.12	44	1.12
42	48.25	2.69	44.50	1393	46.12	48	1.12
44	50.25	2.81	46.50	1579	48.12	52	1.25
46	52.81	2.94	48.62	1825	50.56	40	1.25
48	54.81	3.06	50.75	2045	52.56	44	1.25
50	56.81	3.18	52.75	2284	54.56	48	1.25
52	58.81	3.31	54.75	2547	56.56	52	1.25
54	61.00	3.44	56.75	2848	58.75	56	1.25
56	63.00	3.56	58.75	3145	60.75	60	1.25
58	65.94	3.68	60.75	3560	63.44	48	1.38
60	67.94	3.81	63.00	3913	65.44	52	1.38

*Use 25.4 as a factor to convert into mm.