ASME B16.47 Class 900 Series A Welding Neck Flanges

Nominal Pipe Size	Outside Diameter (O)	Minimum 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	Bolt Circle (C)	Number of Holes	Diameter of Holes
26	42.75 mm	5.50 mm	29.50 mm	11.25 mm	30.50 mm	0.44 mm	26.00 mm	Specified by purchaser	1525 lb	37.50 mm	20	2.88 mm
28	46.00 mm	5.62 mm	31.50 mm	11.75 mm	32.75 mm	0.50 mm	28.00 mm	Specified by purchaser	1810 lb	40.25 mm	20	3.12 mm
30	48.50 mm	5.88 mm	33.75 mm	12.25 mm	35.00 mm	0.50 mm	30.00 mm	Specified by purchaser	2120 lb	42.75 mm	20	3.12 mm
32	51.75 mm	6.25 mm	36.00 mm	13.00 mm	37.25 mm	0.50 mm	32.00 mm	Specified by purchaser	2545 lb	45.50 mm	20	3.38 mm
34	55.00 mm	6.50 mm	38.00 mm	13.75 mm	39.62 mm	0.56 mm	34.00 mm	Specified by purchaser	2970 lb	48.25 mm	20	3.62 mm
36	57.50 mm	6.75 mm	40.25 mm	14.25 mm	41.88 mm	0.56 mm	36.00 mm	Specified by purchaser	3395 lb	50.75 mm	20	3.62 mm
38	57.50 mm	7.50 mm	43.25 mm	13.88 mm	42.25 mm	0.75 mm	38.00 mm	Specified by purchaser	3385 lb	50.75 mm	20	3.62 mm
40	59.50 mm	7.75 mm	45.75 mm	14.31 mm	44.38 mm	0.81 mm	40.00 mm	Specified by purchaser	3620 lb	52.75 mm	24	3.62 mm
42	61.50 mm	8.12 mm	47.75 mm	14.62 mm	46.31 mm	0.81 mm	42.00 mm	Specified by purchaser	3960 lb	54.75 mm	24	3.62 mm
44	64.88 mm	8.44 mm	50.00 mm	15.38 mm	48.62 mm	0.88 mm	44.00 mm	Specified by purchaser	4300 lb	57.62 mm	24	3.88 mm
46	68.25 mm	8.88 mm	52.50 mm	16.18 mm	50.88 mm	0.88 mm	46.00 mm	Specified by purchaser	4640 lb	60.50 mm	24	4.12 mm
48	70.25 mm	9.19 mm	54.50 mm	16.50 mm	52.88 mm	0.94 mm	48.00 mm	Specified by purchaser	4980 lb	62.50 mm	24	4.12 mm

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