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ASME B16.47 Series B
Class 300 Weld Neck

ASME B16.47 Series B Class 300 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	34.12	3.44	29.00	27.62	5.63	0.56	26.19	Specified by purchaser	31.62	32	1-3/8	1-1/4
28	36.25	3.44	31.00	29.75	5.81	0.56	28.19	Specified by purchaser	33.75	36	1-3/8	1-1/4
30	39.00	3.63	33.25	32.00	6.16	0.56	30.25	Specified by purchaser	36.25	36	1-1/2	1-3/8
32	41.50	4.00	35.50	34.00	6.56	0.62	32.25	Specified by purchaser	38.50	32	1-5/8	1-1/2
34	43.62	4.00	37.50	36.12	6.75	0.62	34.25	Specified by purchaser	40.62	36	1-5/8	1-1/2
36	46.12	4.00	39.75	38.00	7.06	0.62	36.25	Specified by purchaser	42.88	32	1-3/4	1-5/8
38	48.12	4.31	41.75	40.00	7.50	0.62	38.25	Specified by purchaser	44.88	36	1-3/4	1-5/8
40	50.12	4.50	43.88	42.00	7.75	0.62	40.25	Specified by purchaser	46.88	40	1-3/4	1-5/8
42	52.50	4.63	46.00	44.00	8.00	0.62	42.31	Specified by purchaser	49.00	36	1-7/8	1-3/4
44	54.50	4.94	48.00	46.19	8.38	0.62	44.31	Specified by purchaser	51.00	40	1-7/8	1-3/4
46	57.50	5.00	50.00	48.38	8.69	0.62	46.31	Specified by purchaser	53.75	36	2	1-7/8
48	59.50	5.00	52.25	50.31	8.75	0.62	48.31	Specified by purchaser	55.75	40	2	1-7/8
50	61.50	5.38	54.25	52.38	9.19	0.62	50.31	Specified by purchaser	57.75	44	2	1-7/8
52	63.50	5.56	56.25	54.44	9.50	0.62	52.31	Specified by purchaser	59.75	48	2	1-7/8
54	65.88	5.32	58.25	56.50	9.38	0.62	54.31	Specified by purchaser	62.12	48	2	1-7/8
56	69.50	6.00	60.50	58.81	10.50	0.69	56.31	Specified by purchaser	65.00	36	2-3/8	2-1/4
58	71.94	6.00	62.75	60.94	10.75	0.69	58.31	Specified by purchaser	67.44	40	2-3/8	2-1/4
60	73.94	5.88	65.00	62.94	10.63	0.69	60.31	Specified by purchaser	69.44	40	2-3/8	2-1/4

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	867	87.4	737	702	143	14	665.2	Specified by purchaser	803.1	32	1-3/8	1-1/4
28	921	87.4	787	756	148	14	716.0	Specified by purchaser	857.2	36	1-3/8	1-1/4
30	991	92.2	845	813	156	14	768.4	Specified by purchaser	920.8	36	1-1/2	1-3/8
32	1054	101.6	902	864	167	16	819.2	Specified by purchaser	977.9	32	1-5/8	1-1/2
34	1108	101.6	952	917	171	16	870.0	Specified by purchaser	1031.7	36	1-5/8	1-1/2
36	1171	101.6	1010	965	179	16	920.8	Specified by purchaser	1089.2	32	1-3/4	1-5/8
38	1222	109.5	1060	1016	190	16	971.6	Specified by purchaser	1140.0	36	1-3/4	1-5/8
40	1273	114.3	1115	1067	197	16	1022.4	Specified by purchaser	1190.8	40	1-3/4	1-5/8
42	1334	117.6	1168	1118	203	16	1074.7	Specified by purchaser	1244.6	36	1-7/8	1-3/4
44	1384	125.5	1219	1173	213	16	1125.5	Specified by purchaser	1295.4	40	1-7/8	1-3/4
46	1460	127.0	1270	1229	221	16	1176.3	Specified by purchaser	1365.2	36	2	1-7/8
48	1511	127.0	1327	1278	222	16	1227.1	Specified by purchaser	1416.0	40	2	1-7/8
50	1562	136.7	1378	1330	233	16	1277.9	Specified by purchaser	1466.8	44	2	1-7/8
52	1613	141.2	1429	1383	241	16	1328.7	Specified by purchaser	1517.6	48	2	1-7/8
54	1673	135.1	1480	1435	238	16	1379.5	Specified by purchaser	1577.8	48	2	1-7/8
56	1765	152.4	1537	1494	267	17	1430.3	Specified by purchaser	1651.0	36	2-3/8	2-1/4
58	1827	152.4	1594	1548	273	17	1481.1	Specified by purchaser	1713.0	40	2-3/8	2-1/4
60	1878	149.4	1651	1599	270	17	1531.9	Specified by purchaser	1763.8	40	2-3/8	2-1/4

Dimensions are based on ASME B16.47 Series B Class 300 flange requirements. Refer to the applicable standard for complete dimensional requirements.

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