ASME B16.47 Series A Weld Neck Flange/WN Flange Dimensions

Weld neck flange (also known as a high-hub flange and tapered hub flange) is a type of flange. There are two designs. The regular type is used with pipes. The long type is unsuitable for pipes and is used in process plant.A weld neck flange consists of a circular fitting with a protruding rim around the circumference. Generally machined from a forging, these flanges are typically butt welded to a pipe. The rim has a series of drilled holes that permit the flange to be affixed to another flange with bolts.

ASME B16.5 Welding Neck Flanges Class 150/300LBS Dimensions

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ASME B16.47 Series A Welding Neck Flanges Class 150 LBS Dimensions
NPS	A	B	I	Holes	C	D	F	E	G	Weight
22″	750	533.6	35	20	46	149	610	558.8	641	106.64
26″	870	634.6	35	24	68.5	121	675	660.4	749	149.48
28″	925	685.6	35	28	71.5	125	725	711.2	800	168.11
30″	985	736.6	35	28	74.5	137	780	762	857	198.67
32″	1060	787.6	41	28	81	144	832	812.8	914	247.22
34″	1110	838.6	41	32	82.5	149	880	863.6	965	262.48
36″	1170	888.6	41	32	90.5	157	935	914.4	1022	317.38
38″	1240	939.6	41	32	87.4	157	990	965.2	1073	351.81
40″	1290	990.6	41	36	90.5	164	1040	1016	1124	378.08
42″	1345	1041.6	41	36	97	171	1090	1066.8	1194	429.26
44″	1405	1092.6	41	40	102	178	1145	1117.6	1245	485.2
46″	1455	1142.6	41	40	103	186	1195	1168.4	1295	515.45
48″	1510	1193.6	41	44	108	192	1250	1219.2	1359	568.36
50″	1570	1244.6	48	44	111	203	1300	1270	1410	611.67
52″	1625	1295.4	48	44	116	210	1355	1320.8	1460
54″	1685	1346.2	48	44	121	216	1405	1371.6	1511	753.45
56″	1745	1397	48	48	124	229	1455	1422.4	1575	823.45
58″	1805	1447.8	48	48	129	235	1510	1473.2	1626	915.31
60″	1855	1498.6	48	52	132	240	1560	1524	1676	958.02

ASME B16.47 Series A Welding Neck Flanges Class 300 LBS Dimensions
NPS	A	B	I	Holes	C	D	F	E	G	Weight
22″	840	533.6	41	24	66.5	165	640	558.8	641	198.78
26″	970	634.6	44	28	79.5	184	720	660.4	749	281.46
28″	1035	685.6	44	28	85.5	197	775	711.2	800	341.08
30″	1090	736.6	48	28	92	210	825	762	857	389.06
32″	1150	787.6	51	28	98.5	222	880	812.8	914	451.27
34″	1205	838.6	51	28	102	232	935	863.6	965	505.21
36″	1270	888.6	54	32	105	241	990	914.4	1022	566.04
38″	1170	939.6	41	32	108	181	995	965.2	1029	320.29
40″	1240	990.6	44	32	114	194	1050	1016	1086	386.86
42″	1290	1041.6	44	32	119	200	1100	1066.8	1137	420.78
44″	1355	1092.6	48	32	124	206	1150	1117.6	1194	477.69
46″	1415	1142.6	51	28	129	216	1205	1168.4	1245	547.53
48″	1465	1193.6	51	32	133	224	1255	1219.2	1314	579.42
50″	1530	1244.6	54	32	140	232	1305	1270	1359	660.62
52″	1580	1295.4	54	32	144	238	1355	1320.8	1410	704.46
54″	1660	1346.2	60	28	152	252	1410	1371.6	1467	859.88
56″	1710	1397	60	28	154	260	1465	1422.4	1518	909.22
58″	1760	1447.8	60	32	159	267	1515	1473.2	1575	954.56
60″	1810	1498.6	60	32	164	273	1585	1524	1620	1034.68

ASME B16.47 Series A Welding Neck Flanges Class 400 LBS Dimensions
NPS	A	B	I	Holes	C	D	F	E	G	Weight
26″	971.5	660	47.6	28	88.9	193.6	727.1	660.4	749.3	278.2
28″	1035	711	50.8	28	95.3	206.4	782.6	711.2	800.1	331.05
30″	1092.2	762	54	28	101.6	219.1	836.6	762	857.2	380.6
32″	1149.4	813	54	28	108	231.8	889	812.8	914.4	440.19
34″	1206.5	864	54	28	111.1	241.3	944.5	863.6	965.2	493.91
36″	1270	914	54	32	114.3	250.8	1000.1	914.4	1022.3	558.47
38″	1206.5	965	47.6	32	123.8	206.4	1028.3	965.2	1035.1	382.14
40″	1270	1016	50.8	32	130.2	215.9	1054.3	1016	1092.2	426.85
42″	1320.8	1067	50.8	32	133.3	223.8	1108.1	1066.8	1143	461.35
44″	1384.3	1118	54	32	139.7	233.3	1158.9	1117.6	1200.1	527.39
46″	1441.5	1168	54	36	146.1	244.5	1212.9	1168.4	1257.3	589.2
48″	1511.3	1219	60.3	28	152.4	257.2	1266.8	1219.2	1308.1	701.2
50″	1568.5	1270	60.3	32	157.2	268.3	1320.8	1270	1362.1	762.55
52″	1619.3	1320.8	60.3	32	161.9	276.2	1371.6	1320.8	1412.9	817.47
54″	1801.8	1371.6	66.7	28	169.9	288.9	1425.6	1371.6	1470	1365.38
56″	1752.6	1422.4	66.7	32	174.6	298.5	1479.5	1422.4	1527.2	1050.08
58″	1803.4	1473.2	66.7	32	177.8	306.4	1530.4	1473.2	1578	1109.94
60″	1886	1524	73	32	185.7	319.5	1584.3	1524	1635.1	1308.36

ASME B16.47 Series A Welding Neck Flanges Class 600 LBS Dimensions
NPS	A	B	I	Holes	C	D	F	E	G	Weight
22″	870	533.6	47	24	95	197	640	558.8	641	297.33
26″	1015	634.6	51	28	108	222	720	660.4	749	427.31
28″	1075	685.6	54	28	111	235	775	711.2	800	482.76
30″	1130	736.6	54	28	114	248	825	762	857	538.17
32″	1194	787.6	60	28	117	260	880	812.8	914	601.33
34″	1245	838.6	60	28	121	270	935	863.6	965	662.34
36″	1315	888.6	60	28	124	283	990	914.4	1022	766.03
38″	1270	939.6	60	28	152	254	995	965.2	1054	647.52
40″	1320	990.6	60	32	159	264	1050	1016	1111	698.63
42″	1405	1041.6	67	28	168	279	1100	1066.8	1168	862.44
44″	1455	1092.6	67	32	173	289	1150	1117.6	1226	909.24
46″	1510	1142.6	67	32	179	300	1205	1168.4	1276	1006.27
48″	1595	1193.6	73	32	189	316	1255	1219.2	1283	1197.07
50″	1670	1244.6	79	28	197	329	1305	1270	1384	1396.43
52″	1720	1295.4	79	32	203	337	1355	1320.8	1435	1459.86
54″	1780	1346.2	79	32	210	349	1410	1371.6	1492	1618.08
56″	1855	1397	86	32	217	362	1465	1422.4	1543	1811.43
58″	1905	1447.8	86	32	222	370	1515	1473.2	1600	1916.61
60″	1995	1498.6	92	28	233	389	1585	1524	1657	2334.54

ASME B16.47 Series A Welding Neck Flanges Class 900 LBS Dimensions
NPS	A	B	I	Holes	C	D	F	E	G	Weight
26″	1085.9	634.6	73	20	139.7	285.4	774.7	660.4	749.3	683.94
28″	1168.4	685.6	79.4	20	142.9	298.5	831.8	711.2	800.1	804.27
30″	1231.9	736.6	79.4	20	149.2	311.2	889	762	857.3	927.13
32″	1314.5	787.6	85.7	20	158.8	330.2	946.2	812.8	914.4	1110.94
34″	1397	838.6	92.1	20	165.1	349.3	1006.5	863.6	965.2	1301.24
36″	1460.5	888.6	92.1	20	171.5	362	1063.6	914.4	1022.4	1472.55
38″	1460.5	939.6	92.1	20	190.5	352.4	1073.2	965.2	1098.5	1437.44
40″	1511.3	990.6	92.1	24	196.8	363.5	1127.1	1016	1162.1	1519.68
42″	1562.1	1041.6	92.1	24	206.4	371.5	1176.3	1066.8	1212.8	1656.66
44″	1647.8	1092.6	98.4	24	214.3	390.5	1235.1	1117.6	1270	1926.04
46″	1733.5	1142.6	104.8	24	225.4	411.2	1292.2	1168.4	1333.5	2252.32
48″	1784.4	1193.6	104.8	24	233.4	419.1	1343	1219.2	1384.3	2419.63

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