ANSI / ASME B16.47 Class 300 Series B Weld Neck Flange Dimensions

Nominal Pipe Size	Outside Diameter (O)	Min Thickness (T)	Raised Face Diameter (R)	Length Thru Hub (Y)	Hub Diameter (X)	Minimum Fillet Radius (r)	Top of Hub (A)	Bore (B)	Approximate Weight (lbs)	Bolt Circle (C)	Number of Holes	Diameter of Holes
26	34.12	3.50	29.00	5.69	27.62	0.56	26.19	Specified by purchaser	400	31.62	32	1.38
28	36.25	3.50	31.00	5.88	29.75	0.56	28.19	Specified by purchaser	450	33.75	36	1.38
30	39.00	3.69	33.25	6.22	32.00	0.56	30.25	Specified by purchaser	550	36.25	36	1.50
32	41.50	4.06	33.50	6.62	34.00	0.62	32.25	Specified by purchaser	685	38.50	32	1.62
34	43.62	4.06	37.50	6.81	36.12	0.62	34.25	Specified by purchaser	750	40.62	36	1.62
36	46.12	4.06	39.75	7.12	38.00	0.62	36.25	Specified by purchaser	840	42.88	32	1.75
38	48.12	4.38	41.75	7.56	40.00	0.62	38.25	Specified by purchaser	915	44.88	36	1.75
40	50.12	4.56	43.88	7.81	42.00	0.62	40.25	Specified by purchaser	990	46.88	40	1.75
42	52.50	4.69	46.00	8.06	44.00	0.62	42.31	Specified by purchaser	1135	49.00	36	1.88
44	54.50	5.00	48.00	8.44	46.19	0.62	44.31	Specified by purchaser	1235	51.00	40	1.88
46	57.50	5.06	50.00	8.75	48.38	0.62	46.31	Specified by purchaser	1470	53.75	36	2.00
48	59.50	5.06	52.25	8.81	50.31	0.62	48.31	Specified by purchaser	1575	55.75	40	2.00
50	61.50	5.44	54.25	9.25	52.38	0.62	50.31	Specified by purchaser	1710	57.75	44	2.00
52	63.50	5.62	56.25	9.56	54.44	0.62	52.31	Specified by purchaser	1840	59.75	48	2.00
54	65.88	5.38	58.25	9.44	56.50	0.62	54.31	Specified by purchaser	1980	62.12	48	2.00
56	69.50	6.06	60.50	10.56	58.81	0.69	56.31	Specified by purchaser	2595	65.00	36	2.38
58	71.94	6.06	62.75	10.81	60.94	0.69	58.31	Specified by purchaser	2770	67.44	40	2.38
60	73.94	5.94	65.00	10.69	62.94	0.69	60.31	Specified by purchaser	2870	69.44	40	2.38

*Use 25.4 as a factor to convert into mm.