Dimensions Weld Neck & Blind flanges ASME B16.47 series A

Class 300 | Class 400 | Class 600 | Class 900

Class 150 – NPS 26 – NPS 60
NPS OD D B
(WNF)
B
(BLF)
H A G K L No of
Bolts
Stud Bolt
Dia x L
26 660.4 870 66.7
68.3
66.7
68.3
119
120.6
676 749 806.4 34.9 24 1.1/4 222

 

 

Class 150 – NPS 26 – NPS 60
NPS OD D B
(WNF)
B
(BLF)
H A G K L No of
Bolts
Stud Bolt
Dia x L
28 711.2 925 69.9
71.5
69.9
71.5
124
125.6
727 800 863.6 34.9 28 1.1/4 228

 

 

Class 150 – NPS 26 – NPS 60
NPS OD D B
(WNF)
B
(BLF)
H A G K L No of
Bolts
Stud Bolt
Dia x L
30 762 985 73.1
74.7
73.1
74.7
135
136.6
781 857 914.4 34.9 28 1.1/4 234

 

Class 150 – NPS 26 – NPS 60
NPS OD D B
(WNF)
B
(BLF)
H A G K L No of
Bolts
Stud Bolt
Dia x L
32 812.8 1060 79.4
81
79.4
81
143
144.6
832 914 977.9 41.3 28 1.1/2 266

 

Class 150 – NPS 26 – NPS 60
NPS OD D B
(WNF)
B
(BLF)
H A G K L No of
Bolts
Stud Bolt
Dia x L
34 863.6 1110 81
82.6
81
82.6
148
149.6
883 965 1028.7 41.3 32 1.1/2 266

 

Class 150 – NPS 26 – NPS 60
NPS OD D B
(WNF)
B
(BLF)
H A G K L No of
Bolts
Stud Bolt
Dia x L
36 914.4 1170 88.9
90.5
88.9
90.5
156
157.6
933 1022 1085.8 41.3 32 1.1/2 279

 

Class 150 – NPS 26 – NPS 60
NPS OD D B
(WNF)
B
(BLF)
H A G K L No of
Bolts
Stud Bolt
Dia x L
38 965.2 1240 85.8
87.4
85.8
87.4
156
157.6
991 1073 1149.4 41.3 32 1.1/2 279

 

Class 150 – NPS 26 – NPS 60
NPS OD D B
(WNF)
B
(BLF)
H A G K L No of
Bolts
Stud Bolt
Dia x L
40 1016 1290 88.9
90.5
88.9
90.5
162
163.6
1041 1124 1200.2 41.3 36 1.1/2 279

 

Class 150 – NPS 26 – NPS 60
NPS OD D B
(WNF)
B
(BLF)
H A G K L No of
Bolts
Stud Bolt
Dia x L
42 1066.8 1345 95.3
96.9
95.3
96.9
170
171.6
1092 1194 1257.3 41.3 36 1.1/2 292

 

Class 150 – NPS 26 – NPS 60
NPS OD D B
(WNF)
B
(BLF)
H A G K L No of
Bolts
Stud Bolt
Dia x L
44 1117.6 1405 100.1
101.7
100.1
101.7
176
177.6
1143 1245 1314.4 41.3 40 1.1/2 304

 

Class 150 – NPS 26 – NPS 60
NPS OD D B
(WNF)
B
(BLF)
H A G K L No of
Bolts
Stud Bolt
Dia x L
46 1168.4 1455 101.6
103.2
101.6
103.2
184
185.6
1197 1295 1365.2 41.3 40 1.1/2 304

 

Class 150 – NPS 26 – NPS 60
NPS OD D B
(WNF)
B
(BLF)
H A G K L No of
Bolts
Stud Bolt
Dia x L
48 1219.2 1510 106.4
108
106.4
108
191
192.6
1248 1359 1422.4 41.3 44 1.1/2 317

 

Class 150 – NPS 26 – NPS 60
NPS OD D B
(WNF)
B
(BLF)
H A G K L No of
Bolts
Stud Bolt
Dia x L
50 1270 1570 109.6
111.2
109.6
111.2
202
203.6
1302 1410 1479.6 47.6 44 1.3/4 336

 

Class 150 – NPS 26 – NPS 60
NPS OD D B
(WNF)
B
(BLF)
H A G K L No of
Bolts
Stud Bolt
Dia x L
52 1320.8 1625 114.3
115.9
114.3
115.9
208
209.6
1353 1461 1536.7 47.6 44 1.3/4 349

 

Class 150 – NPS 26 – NPS 60
NPS OD D B
(WNF)
B
(BLF)
H A G K L No of
Bolts
Stud Bolt
Dia x L
54 1371.6 1685 119.1
120.7
119.1
120.7
214
215.6
1403 1511 1593.8 47.6 44 1.3/4 355

 

Class 150 – NPS 26 – NPS 60
NPS OD D B
(WNF)
B
(BLF)
H A G K L No of
Bolts
Stud Bolt
Dia x L
56 1422.4 1745 122.3
123.9
122.3
123.9
227
228.6
1457 1575 1651 47.6 48 1.3/4 361

 

Class 150 – NPS 26 – NPS 60
NPS OD D B
(WNF)
B
(BLF)
H A G K L No of
Bolts
Stud Bolt
Dia x L
58 1473.2 1805 127
128.6
127
128.6
233
234.6
1508 1626 1708.2 47.6 48 1.3/4 374

 

Class 150 – NPS 26 – NPS 60
NPS OD D B
(WNF)
B
(BLF)
H A G K L No of
Bolts
Stud Bolt
Dia x L
60 1524 1855 130.2
131.8
130.2
131.8
238
239.6
1559 1676 1759 47.6 52 1.3/4 381

 

Weld Neck and Blind flange

 

Important  Information

 

General notes:

  • Dimensions are in millimeters unless otherwise indicated.
  • For dimensions “B” and “H”, see important information on the top right of the image.
  • ASME B16.47 Series A flanges (≥ NPS 26) are MSS SP-44 flanges.
    ASME has incorporated the MSS-SP44 specification into B16.47 Series A and the API 605 Specification into B16.47 series B.
    These specification include only Welding Neck and Blind Flanges.
  • Dimensions for Classes 400, 600 and 900 NPS 38 and larger for Series B flanges are the same as for the Series A flanges.
  • The length of the Stud Bolt does not include the height of the chamfers (points).

 

Measuring lengths of Stud Bolts and Hex bolts

 

Indications:

  • OD = Diameter at Weld Bevel
  • D = Overall Diameter of Flange
  • B (WNF) = Minimum Thickness of Welding Neck Flange
  • B (BLF) = Minimum Thickness of Blind Flange
  • H = Length thru Hub
  • A = Diameter at Base of Hub
  • G = Outside Diameter of Raised Face
  • K = Bolt Circle Diameter
  • L = Diameter of Bolt Holes