ASME B16.47 Series B Class 900 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	40.25	5.31	6.06	10.19	29.25	26.00	30.00	35.50	20	25⁄8	21⁄2	0.44
28	43.50	5.81	6.56	10.88	31.38	28.00	32.25	38.25	20	27⁄8	23⁄4	0.50
30	46.50	6.12	6.93	11.38	33.50	30.00	34.50	40.75	20	31⁄8	3	0.50
32	48.75	6.31	7.31	11.94	35.75	32.00	36.50	43.00	20	31⁄8	3	0.50
34	51.75	6.75	7.68	12.56	37.88	34.00	39.00	45.50	20	33⁄8	31⁄4	0.56
36	53.00	6.81	7.94	12.81	40.00	36.00	40.50	47.25	24	31⁄8	3	0.56
38	57.50	7.50	8.50	13.88	42.25	38.00	43.25	50.75	20	35⁄8	31⁄2	0.75
40	59.50	7.75	8.81	14.31	44.38	40.00	45.75	52.75	24	35⁄8	31⁄2	0.81
42	61.50	8.12	9.12	14.62	46.31	42.00	47.75	54.75	24	35⁄8	31⁄2	0.81
44	64.88	8.44	9.56	15.38	48.62	44.00	50.00	57.62	24	37⁄8	33⁄4	0.88
46	68.25	8.88	10.06	16.18	50.88	46.00	52.50	60.50	24	41⁄8	4	0.88
48	70.25	9.19	10.38	16.50	52.88	48.00	54.50	62.50	24	41⁄8	4	0.94

ASME B16.47 Series B Class 900 Flange Industries and Applications
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ASME B16.47 Series B Class 900 Flange Supply and Export Network
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