ANSI / ASME B16.47 Series B Class 150 Weld Neck Flange Dimensions

Nominal Pipe Size	Outside Diameter (O)	Max 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	30.94	1.62	28.00	3.50	26.94	0.38	26.06	Specified by purchaser	120	29.31	36	0.88
28	32.94	1.75	30.00	3.75	28.94	0.38	28.06	Specified by purchaser	140	31.31	40	0.88
30	34.94	1.75	32.00	3.94	31.00	0.38	30.06	Specified by purchaser	150	33.31	44	0.88
32	37.06	1.81	34.00	4.25	33.06	0.38	32.06	Specified by purchaser	170	35.44	48	0.88
34	39.56	1.94	36.25	4.34	35.12	0.38	34.06	Specified by purchaser	210	37.69	40	1.00
36	41.62	2.06	38.25	4.62	37.19	0.38	36.06	Specified by purchaser	240	39.75	44	1.00
38	44.25	2.12	40.25	4.88	39.25	0.38	38.12	Specified by purchaser	290	42.12	40	1.12
40	46.25	2.19	42.50	5.06	41.31	0.38	40.12	Specified by purchaser	310	44.12	44	1.12
42	48.25	2.31	44.50	5.25	43.38	0.44	42.12	Specified by purchaser	345	46.12	48	1.12
44	50.25	2.38	46.50	5.38	45.38	0.44	44.12	Specified by purchaser	370	48.12	52	1.25
46	52.81	2.44	48.62	5.69	47.44	0.44	46.12	Specified by purchaser	435	50.56	40	1.25
48	54.81	2.56	50.75	5.88	49.50	0.44	48.12	Specified by purchaser	480	52.56	44	1.25
50	56.81	2.69	52.75	6.06	51.50	0.44	50.12	Specified by purchaser	520	54.56	48	1.25
52	58.81	2.75	54.75	6.19	53.56	0.44	52.12	Specified by purchaser	550	56.56	52	1.25
54	61.00	2.81	56.75	6.38	55.62	0.44	54.12	Specified by purchaser	620	58.75	56	1.25
56	63.00	2.88	58.75	6.56	57.69	0.56	56.12	Specified by purchaser	650	60.75	60	1.25
58	65.94	2.94	60.75	6.88	59.69	0.56	58.12	Specified by purchaser	780	63.44	48	1.38
60	67.94	3.00	63.00	7.06	61.81	0.56	60.12	Specified by purchaser	850	65.44	52	1.38

*Use 25.4 as a factor to convert into mm.