ASME B16.47 Class 300 Series B Blind Flanges

Nominal Pipe Size	Outside Diameter (O)	Minimum Thickness (T)	Raised Face Diameter (R)	Approximate Weight	Bolt Circle (C)	Number of Holes	Diameter of Holes
26	34.12 in	3.50 in	29.00 in	905 lb	31.62 in	32	1.38 in
28	36.25 in	3.50 in	31.00 in	1023 lb	33.75 in	36	1.38 in
30	39.00 in	3.69 in	33.25 in	1250 lb	36.25 in	36	1.50 in
32	41.50 in	4.06 in	35.50 in	1556 lb	38.50 in	32	1.62 in
34	43.62 in	4.06 in	37.50 in	1719 lb	40.62 in	36	1.62 in
36	46.12 in	4.06 in	39.75 in	1920 lb	42.88 in	32	1.75 in
38	48.12 in	4.38 in	41.75 in	2257 lb	44.88 in	36	1.75 in
40	50.12 in	4.56 in	43.88 in	2550 lb	46.88 in	40	1.75 in
42	52.50 in	4.69 in	46.00 in	2875 lb	49.00 in	36	1.88 in
44	54.50 in	5.00 in	48.00 in	3305 lb	51.00 in	40	1.88 in
46	57.50 in	5.12 in	50.00 in	3766 lb	53.75 in	36	2.00 in
48	59.50 in	5.31 in	52.25 in	4183 lb	55.75 in	40	2.00 in
50	61.50 in	5.50 in	54.25 in	4629 lb	57.75 in	44	2.00 in
52	63.50 in	5.68 in	56.25 in	5096 lb	59.75 in	48	2.00 in
54	65.88 in	5.88 in	58.25 in	5679 lb	62.12 in	48	2.00 in
56	69.50 in	6.18 in	60.50 in	6642 lb	65.00 in	36	2.38 in
58	71.94 in	6.38 in	62.75 in	7347 lb	67.44 in	40	2.38 in
60	73.94 in	6.56 in	65.00 in	7980 lb	69.44 in	40	2.38 in

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