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

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
26 661.9 785 39.8
41.4
43
44.6
87
88.6
684 711 744.5 22.2 36 3/4 140

 

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
28 712.7 835 43
44.6
46.2
47.8
94
95.6
735 762 795.3 22.2 40 3/4 146

 

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
30 763.5 885 43
44.6
49.3
50.9
98
99.6
787 813 846.1 22.2 44 3/4 146

 

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
32 814.3 940 44.6
46.2
52.5
54.1
106
107.6
840 864 900.1 22.2 48 3/4 146

 

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
34 865.1 1005 47.7
49.3
55.7
57.3
109
110.6
892 921 957.3 25.4 40 7/8 159

 

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
36 915.9 1055 50.9
52.5
57.3
58.9
116
117.6
945 972 1009.6 25.4 44 7/8 165

 

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 1019 1175 54.1
55.7
65.2
66.8
127
128.6
1049 1080 1120.8 28.6 44 1 178

 

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 1069.8 1225 57.3
58.9
66.8
68.4
132
133.6
1102 1130 1171.6 28.6 48 1 184

 

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 1120.6 1275 58.9
60.5
70
71.6
135
136.6
1153 1181 1222.4 28.6 52 1 190

 

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 1171.4 1340 60.4
62
73.1
74.7
143
144.6
1205 1235 1284.3 31.8 40 1.1/8 203

 

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 1222.2 1390 63.6
65.2
76.3
77.9
148
149.6
1257 1289 1335.1 31.8 44 1.1/8 203

 

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 1273 1445 66.8
68.4
79.5
81.1
152
153.6
1308 1340 1385.9 31.8 48 1.1/8 210

 

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 1323.8 1495 68.4
70
82.7
84.3
156
157.6
1360 1391 1436.7 31.8 52 1.1/8 216

 

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 1374.6 1550 70
71.6
85.8
87.4
160
161.6
1413 1441 1492.2 31.8 56 1.1/8 216

 

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 1425.4 1600 71.6
73.2
89
90.6
165
166.6
1465 1492 1543 31.8 60 1.1/8 222

 

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
58 1476.2 1675 73.1
74.7
91.9
93.5
173
174.6
1516 1543 1611.3 34.9 48 1.1/4 229

 

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 1527 1725 74.7
76.3
95.4
97
178
179.6
1570 1600 1662.1 34.9 52 1.1/4 235

 

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