ASME B16.47 Series B Class 75 Flange Dimensions

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Nominal Size	Outside Diameter (OD)	Min. Thickness [Note1] – WNF  (tf)	Min. Thickness [Note1] – Blind  (tf)	Length Through Hub  (Y)	Hub Dia. Base [Note2] (X)	Hub Dia. Top (A)	Raised Face Dia.  (R)	Drilling – Bolt Circle Dia.	Drilling – No. of Bolt Holes	Drilling – Dia. of Bolt Hole	Dia. of Bolt	Min. Fillet Radius (r1)
26	30.00	1.25	1.25	2.25	26.62	26.06	27.75	28.50	36	3⁄4	5⁄8	0.31
28	32.00	1.25	1.25	2.38	28.62	28.06	29.75	30.50	40	3⁄4	5⁄8	0.31
30	34.00	1.25	1.25	2.50	30.62	30.06	31.75	32.50	44	3⁄4	5⁄8	0.31
32	36.00	1.32	1.38	2.69	32.62	32.06	33.75	34.50	48	3⁄4	5⁄8	0.31
34	38.00	1.32	1.44	2.82	34.62	34.06	35.75	36.50	52	3⁄4	5⁄8	0.31
36	40.69	1.38	1.61	3.32	36.81	36.06	38.00	39.06	40	7⁄8	3⁄4	0.38
38	42.69	1.44	1.69	3.44	38.81	38.06	40.00	41.06	40	7⁄8	3⁄4	0.38
40	44.69	1.44	1.69	3.57	40.81	40.06	42.00	43.06	44	7⁄8	3⁄4	0.38
42	46.69	1.50	1.82	3.69	42.81	42.06	44.00	45.06	48	7⁄8	3⁄4	0.38
44	49.25	1.63	1.88	4.07	44.88	44.06	46.25	47.38	36	1	7⁄8	0.38
46	51.25	1.69	1.94	4.19	46.88	46.06	48.25	49.38	40	1	7⁄8	0.38
48	53.25	1.75	2.07	4.32	48.88	48.06	50.25	51.38	44	1	7⁄8	0.38
50	55.25	1.82	2.13	4.50	50.94	50.06	52.25	53.38	44	1	7⁄8	0.38
52	57.38	1.82	2.19	4.69	52.94	52.06	54.25	55.50	48	1	7⁄8	0.38
54	59.38	1.88	2.32	4.88	55.00	54.06	56.25	57.50	48	1	7⁄8	0.38
56	62.00	1.94	2.38	5.25	57.12	56.06	58.50	59.88	40	11⁄8	1	0.44
58	64.00	2.00	2.44	5.38	59.12	58.06	60.50	61.88	44	11⁄8	1	0.44
60	66.00	2.13	2.57	5.63	61.12	60.06	62.50	63.88	44	11⁄8	1	0.44

ASME B16.47 Series B Class 75 Flange Industries and Applications
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ASME B16.47 Series B Class 75 Flange Supply and Export Network
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