ASME B16.20 Spiral Wound Gasket for ASME B 16.47 Series A Flange

Flange Size (NPS)	Class 150			Class 300			Class 400
	Gasket		Centering Ring Outside Diameter (3)	Gasket		Centering Ring Outside Diameter (3)	Gasket		Centering Ring Outside Diameter (3)
	Inside Diamter (1)	Outside Diameter (2)		Inside Diamter (1)	Outside Diameter (2)		Inside Diamter (1)	Outside Diameter (2)
26	673.1	704.9	774.7	685.8	736.6	835.2	685.8	736.6	831.9
28	723.9	755.7	831.9	736.6	787.4	898.7	736.6	787.4	892.3
30	774.7	806.5	882.7	793.8	844.6	952.5	793.8	844.6	946.2
32	825.5	860.6	939.8	850.9	901.7	1006.6	850.9	901.7	1003.3
34	876.3	911.4	990.6	901.7	952.5	1057.4	901.7	952.5	1054.1
36	927.1	968.5	1047.8	955.8	1006.6	1117.6	955.8	1006.6	1117.6
38	977.9	1019.3	1111.3	977.9	1016.0	1054.1	971.6	1022.4	1073.2
40	1028.7	1070.1	1162.1	1022.4	1070.1	1114.6	1025.7	1076.5	1127.3
42	1079.5	1124.0	1219.2	1073.2	1120.9	1165.4	1076.5	1127.3	1178.1
44	1130.3	1178.1	1276.4	1130.3	1181.1	1219.2	1130.3	1181.1	1231.9
46	1181.1	1228.9	1327.2	1178.1	1228.9	1273.3	1193.8	1244.6	1289.1
48	1231.9	1279.7	1384.3	1235.2	1286.0	1324.1	1244.6	1295.4	1346.2
50	1282.7	1333.5	1435.1	1295.4	1346.2	1378.0	1295.4	1346.2	1403.4
52	1333.5	1384.3	1492.3	1346.2	1397.0	1428.8	1346.2	1397.0	1454.2
54	1384.3	1435.1	1549.4	1403.4	1454.2	1492.3	1403.4	1454.2	1517.7
56	1435.1	1485.9	1606.6	1454.2	1505.0	1543.1	1454.2	1505.0	1568.5
58	1485.9	1536.7	1663.7	1511.3	1562.1	1593.9	1505.0	1555.8	1619.3
60	1536.7	1587.5	1714.5	1562.1	1612.9	1644.7	1568.5	1619.3	1682.8
Flange Size (NPS)	Class 600			Class 900
26	685.8	736.6	866.9	685.8	736.6	866.9
28	736.6	787.4	914.4	736.6	787.4	946.2
30	793.8	844.6	971.6	793.8	844.6	1009.7
32	850.9	901.7	1022.4	850.9	901.7	1073.2
34	901.7	952.5	1073.2	901.7	952.5	1136.7
36	955.8	1006.6	1130.3	958.9	1009.7	1200.2
38	990.6	1041.4	1104.9	1035.1	1085.9	1200.2
40	1047.8	1098.6	1155.7	1098.6	1149.4	1251.0
42	1104.9	1155.7	1219.2	1149.4	1200.2	1301.8
44	1162.1	1212.9	1270.0	1206.5	1257.3	1368.6
46	1212.9	1263.7	1327.2	1270.0	1320.8	1435.1
48	1270.0	1320.8	1390.7	1320.8	1371.6	1485.9
50	1320.8	1371.6	1447.8	. . .	. . .	. . .
52	1371.6	1422.4	1498.6	. . .	. . .	. . .
54	1428.8	1479.6	1555.8	. . .	. . .	. . .
56	1479.6	1530.4	1612.9	. . .	. . .	. . .
58	1536.7	1587.5	1663.7	. . .	. . .	. . .
60	1593.9	1644.7	1733.6	. . .	. . .	. . .

*ASME B16.47 Series A flanges NPS 12 through NPS 24 have the same raised face dimensions as ASME B16.5 flanges.
(1) The gasket inside diameter tolerance for NPS 26 through NPS 34 is ±0.8mm, and the tolerance for NPS 36 through NPS 60 is ±1.5mm.
(2) The gaskte outside diameter toleracne for NPS 26 through NPS 60 is ±1.5mm.
(3) The centering ring outside diameter tolerance is ±0.8mm.
(4) There are no Class 900 flanges NPS 50 and larger.

ASME B16.20 Spiral Wound Gasket for ASME B 16.47 Series B Flange

Flange Size (NPS)	Class 150			Class 300			Class 400
	Gasket		Centering Ring Outside Diameter (3)	Gasket		Centering Ring Outside Diameter (3)	Gasket		Centering Ring Outside Diameter (3)
	Inside Diameter (1)	Outside Diameter (2)		Inside Diameter (1)	Outside Diameter (2)		Inside Diameter (1)	Outside Diameter (2)
26	673.1	698.5	725.4	673.1	711.2	771.7	666.8	698.5	746.3
28	723.9	749.3	776.2	723.9	762.0	825.5	714.5	749.3	800.1
30	774.7	800.1	827.0	774.7	812.8	886.0	765.3	806.5	857.3
32	825.5	850.9	881.1	825.5	863.6	939.8	812.8	860.6	911.4
34	876.3	908.1	935.0	876.3	914.4	993.9	866.9	911.4	962.2
36	927.1	958.9	987.6	927.1	965.2	1047.8	917.7	965.2	1022.4
38	974.9	1009.7	1044.7	1009.7	1047.8	1098.6	971.6	1022.4	1073.2
40	1022.4	1063.8	1095.5	1060.5	1098.6	1149.4	1025.7	1076.5	1127.3
42	1079.5	1114.6	1146.3	1111.3	1149.4	1200.2	1076.5	1127.3	1178.1
44	1124.0	1165.4	1197.1	1162.1	1200.2	1251.0	1130.3	1181.1	1231.9
46	1181.1	1224.0	1255.8	1216.2	1254.3	1317.8	1193.8	1244.6	1289.1
48	1231.9	1270.0	1306.6	1263.7	1311.4	1368.6	1244.6	1295.4	1346.2
50	1282.7	1325.6	1357.4	1317.8	1355.9	1419.4	1295.4	1346.2	1403.4
52	1333.5	1376.4	1408.2	1368.6	1406.7	1470.2	1346.2	1397.0	1454.2
54	1384.3	1422.4	1463.8	1403.4	1454.2	1530.4	1403.4	1454.2	1517.7
56	1444.8	1478.0	1514.6	1479.6	1524.0	1593.9	1454.2	1505.0	1568.5
58	1500.1	1528.8	1579.6	1535.2	1573.3	1655.8	1505.0	1555.8	1619.3
60	1557.3	1586.0	1630.4	1589.0	1630.4	1706.6	1568.5	1619.3	1682.8
Flange Size (NPS)	Class 600			Class 900
26	663.7	714.5	765.3	692.2	749.3	838.2
28	704.9	755.7	819.2	743.0	800.1	901.7
30	778.0	828.8	879.6	806.5	857.3	958.9
32	831.9	882.7	933.5	863.6	914.4	1016.0
34	889.0	939.8	997.0	920.8	971.6	1073.2
36	939.8	990.6	1047.8	946.2	997.0	1124.0
38	990.6	1041.4	1104.9	1035.1	1085.9	1200.2
40	1047.8	1098.6	1155.7	1098.6	1149.4	1251.0
42	1104.9	1155.7	1219.2	1149.4	1200.2	1301.8
44	1162.1	1212.9	1270.0	1206.5	1257.3	1368.6
46	1212.9	1263.7	1327.2	1270.0	1320.8	1435.1
48	1270.0	1320.8	1390.7	1320.8	1371.6	1485.9
50	1320.8	1371.6	1447.8	. . .	. . .	. . .
52	1371.6	1422.4	1498.6	. . .	. . .	. . .
54	1428.8	1479.6	1555.8	. . .	. . .	. . .
56	1479.6	1530.4	1612.9	. . .	. . .	. . .
58	1536.7	1587.5	1663.7	. . .	. . .	. . .
60	1593.9	1644.7	1733.6	. . .	. . .	. . .

(1) The gasket inside diameter tolerance for NPS 26 through NPS 34 is ±0.8mm, and the tolerance for NPS 36 through NPS 60 is ±1.3mm.
(2) The gaskte outside diameter toleracne for NPS 26 through NPS 60 is ±1.5mm.
(3) The centering ring outside diameter tolerance is ±0.8mm.
(4) There are no Class 900 flanges NPS 50 and larger.