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ANSI B16.5 Class 2500 Forged Flanges
ANSI B16.5 Class 2500 Forged Flanges
ANSI B16.5 Class 2500 Forged Flanges Weld Neck Forged Flange
ANSI B16.5 Class 2500 Forged Flanges Threaded Forged Flange
ANSI B16.5 Class 2500 Forged Flanges Lap Joint Forged Flange
Nom. Pipe Size
O
T
R
X
#/Dia of Holesa
Bolt Circle Dia
B2b
B3
H
L
L2
L3
r
C
Thr
½
5.25
1.19
1.38
1.69
4-0.88
3.50
0.90
0.84
1.56
2.88
1.56
0.12
0.93
1.12
¾
5.50
1.25
1.69
2.00
4-0.88
3.75
1.11
1.05
1.69
3.12
1.69
0.12
1.14
1.25
1
6.25
1.38
2.00
2.25
4-1.00
4.25
1.38
1.32
1.88
3.50
1.88
0.12
1.41
1.38
1¼
7.25
1.50
2.50
2.88
4-1.12
5.13
1.72
1.66
2.06
3.75
2.06
0.19
1.75
1.50
1½
8.00
1.75
2.88
3.12
4-1.25
5.75
1.97
1.90
2.38
4.38
2.38
0.25
1.99
1.75
2
9.25
2.00
3.63
3.75
8-1.12
6.75
2.46
2.38
2.75
5.00
2.75
0.31
2.50
2.00
2½
10.50
2.25
4.13
4.50
8-1.25
7.75
2.97
2.88
3.12
5.62
3.12
0.31
3.00
2.25
3
12.00
2.62
5.00
5.25
8-1.38
9.00
3.60
3.50
….
6.62
3.62
0.38
….
….
4
14.00
3.00
6.19
6.50
8-1.63
10.75
4.60
4.50
….
7.50
4.25
0.44
….
….
5
16.50
3.62
7.31
8.00
8-1.88
12.75
5.69
5.56
….
9.00
5.12
0.44
….
….
6
19.00
4.25
8.50
9.25
8-2.12
14.50
6.75
6.63
….
10.75
6.00
0.50
….
….
8
21.75
5.00
10.63
12.00
12-2.12
17.25
8.75
8.63
….
12.50
7.00
0.50
….
….
10
26.50
6.50
12.75
14.75
12-2.63
21.25
10.92
10.75
….
16.50
9.00
0.50
….
….
12
30.00
7.25
15.00
17.38
12-2.88
24.38
12.92
12.75
….
18.25
10.00
0.50
….
….
Dimensions are in inches.
(a)- Bolt hole diameter 1/8 in. larger than bolt diameter.
(b)- See bore chart for wall thicknesses.