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ASME B16.47 Series A
Class 400 Weld Neck

ASME B16.47 Series A Class 400 Weld Neck Flange Technical Drawing

DIMENSIONAL DATA

NPS	Flange OD (O)	Thickness (T)	Raised Face Diameter (R)	Hub Diameter (X)	Hub Length (Y)	Point Fillet Radius (r)	Top of Hub (A)	Bore (B)	Bolt Circle Dia.	No. of Holes	Diameter of Bolt Hole	Hole Dia.
26	38.25	3.50	29.50	28.62	7.62	0.44	26.00	Specified by purchaser	34.50	28	1-7/8	1-3/4
28	40.75	3.75	31.50	30.81	8.12	0.50	28.00	Specified by purchaser	37.00	28	2	1-7/8
30	43.00	4.00	33.75	32.94	8.62	0.50	30.00	Specified by purchaser	39.25	28	2-1/8	2
32	45.25	4.25	36.00	35.00	9.12	0.50	32.00	Specified by purchaser	41.50	28	2-1/8	2
34	47.50	4.38	38.00	37.19	9.50	0.56	34.00	Specified by purchaser	43.50	28	2-1/8	2
36	50.00	4.50	40.25	39.38	9.88	0.56	36.00	Specified by purchaser	46.00	32	2-1/8	2
38	47.50	4.88	40.75	39.50	8.12	0.56	38.00	Specified by purchaser	44.00	32	1-7/8	1-3/4
40	50.00	5.12	43.00	41.50	8.50	0.56	40.00	Specified by purchaser	46.25	32	2	1-7/8
42	52.00	5.25	45.00	43.62	8.81	0.56	42.00	Specified by purchaser	48.25	32	2	1-7/8
44	54.50	5.50	47.25	45.62	9.18	0.56	44.00	Specified by purchaser	50.50	32	2-1/8	2
46	56.75	5.75	49.50	47.75	9.62	0.56	46.00	Specified by purchaser	52.75	36	2-1/8	2
48	59.50	6.00	51.50	49.88	10.12	0.56	48.00	Specified by purchaser	55.25	28	2-3/8	2-1/4
50	61.75	6.19	53.62	52.00	10.56	0.56	50.00	Specified by purchaser	57.50	32	2-3/8	2-1/4
52	63.75	6.38	55.62	54.00	10.88	0.56	52.00	Specified by purchaser	59.50	32	2-3/8	2-1/4
54	67.00	6.69	57.88	56.12	11.38	0.56	54.00	Specified by purchaser	62.25	28	2-5/8	2-1/2
56	69.00	6.88	60.12	58.25	11.75	0.56	56.00	Specified by purchaser	64.25	32	2-5/8	2-1/2
58	71.00	7.00	62.12	60.25	12.06	0.56	58.00	Specified by purchaser	66.25	32	2-5/8	2-1/2
60	74.25	7.31	64.38	62.38	12.56	0.56	60.00	Specified by purchaser	69.00	32	2-7/8	2-3/4

NPS	Flange OD (O)	Thickness (T)	Raised Face Diameter (R)	Hub Diameter (X)	Hub Length (Y)	Point Fillet Radius (r)	Top of Hub (A)	Bore (B)	Bolt Circle Dia.	No. of Holes	Diameter of Bolt Hole (Inch)	Diameter of Bolt (Inch)
26	972	88.9	749	727	194	11	660.4	Specified by purchaser	876.3	28	1-7/8	1-3/4
28	1035	95.2	800	783	206	13	711.2	Specified by purchaser	939.8	28	2	1-7/8
30	1092	101.6	857	837	219	13	762.0	Specified by purchaser	997.0	28	2-1/8	2
32	1149	108.0	914	889	232	13	812.8	Specified by purchaser	1054.1	28	2-1/8	2
34	1206	111.3	965	945	241	14	863.6	Specified by purchaser	1104.9	28	2-1/8	2
36	1270	114.3	1022	1000	251	14	914.4	Specified by purchaser	1168.4	32	2-1/8	2
38	1206	124.0	1035	1003	206	14	965.2	Specified by purchaser	1117.6	32	1-7/8	1-3/4
40	1270	130.0	1092	1054	216	14	1016.0	Specified by purchaser	1174.8	32	2	1-7/8
42	1321	133.4	1143	1108	224	14	1066.8	Specified by purchaser	1225.6	32	2	1-7/8
44	1384	139.7	1200	1159	233	14	1117.6	Specified by purchaser	1282.7	32	2-1/8	2
46	1441	146.0	1257	1213	244	14	1168.4	Specified by purchaser	1339.8	36	2-1/8	2
48	1511	152.4	1308	1267	257	14	1219.2	Specified by purchaser	1403.4	28	2-3/8	2-1/4
50	1568	157.2	1362	1321	268	14	1270.0	Specified by purchaser	1460.5	32	2-3/8	2-1/4
52	1619	162.1	1413	1372	276	14	1320.8	Specified by purchaser	1511.3	32	2-3/8	2-1/4
54	1702	169.9	1470	1425	289	14	1371.6	Specified by purchaser	1581.2	28	2-5/8	2-1/2
56	1753	174.8	1527	1480	298	14	1422.4	Specified by purchaser	1632.0	32	2-5/8	2-1/2
58	1803	177.8	1578	1530	306	14	1473.2	Specified by purchaser	1682.8	32	2-5/8	2-1/2
60	1886	185.7	1635	1584	319	14	1524.0	Specified by purchaser	1752.6	32	2-7/8	2-3/4

Dimensions are based on ASME B16.47 Series A Class 400 flange requirements. Refer to the applicable standard for complete dimensional requirements.

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