ANSI / ASME B16.47 Series B Class 300 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	34.12	3.50	29.00	905	31.62	32	1.38
28	36.25	3.50	31.00	1023	33.75	36	1.38
30	39.00	3.69	33.25	1250	36.25	36	1.50
32	41.50	4.06	33.50	1556	38.50	32	1.62
34	43.62	4.06	37.50	1719	40.62	36	1.62
36	46.12	4.06	39.75	1920	42.88	32	1.75
38	48.12	4.38	41.75	2257	44.88	36	1.75
40	50.12	4.56	43.88	2550	46.88	40	1.75
42	52.50	4.69	46.00	2875	49.00	36	1.88
44	54.50	5.00	48.00	3305	51.00	40	1.88
46	57.50	5.12	50.00	3766	53.75	36	2.00
48	59.50	5.31	52.25	4183	55.75	40	2.00
50	61.50	5.50	54.25	4629	57.75	44	2.00
52	63.50	5.68	56.25	5096	59.75	48	2.00
54	65.88	5.88	58.25	5679	62.12	48	2.00
56	69.50	6.18	60.50	6642	65.00	36	2.38
58	71.94	6.38	62.75	7347	67.44	40	2.38
60	73.94	6.56	65.00	7980	69.44	40	2.38

*Use 25.4 as a factor to convert into mm.