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Welding Neck Flange Weld Neck Flange features a neck extension and weld bevel. Provides a natural form connection ideal for larger, high-pressure applications.
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Blind Flange Blind Flange has no bore or inner diameter. They are often altered to include NPT threads or custom bore holes to function as hubless Slip On flanges. |
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Lap Joint Flange Lap Joint Flanges are intended to saddle over a stub end fitting. They feature an extended hub and a machined radius at the base of the flat face. |
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Slip On Flange Slip On Flange is designed to accept the pipe into the center/bore, allowing welding around the outer diameter of the pipe. |
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Socket Weld Flange Socket Weld types have a socket to insert pipe when space limitations make Weld Neck flanges difficult to use. |
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Threaded Flange Threaded Flanges contain a female NPT threaded center for connection to male threaded piping. These flanges are commonly implemented in reducing connections. |
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CLASS 150 According to ASTM A/SA-105; ANSI B16.5 |
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Nominal Pipe Size |
Outside Diam. of Flange (O) |
Thick. of Flange (C) |
Diam. of Raised Face (R) |
Diam. of Hub at Base (X) |
Length thru Hub (Y) |
Min. Thread Length (T) |
Min. Counter Bore (Q) |
No. of Holes |
Diam. of Holes |
Diam. of Bolts |
Diam. of Bolt Circle |
Approx. Weight (in Pounds) |
|
½ |
3.5 |
0.44 |
1.38 |
1.19 |
0.62 |
0.62 |
— |
4 |
0.62 |
0.5 |
2.38 |
1 |
|
¾ |
3.88 |
0.5 |
1.69 |
1.5 |
0.62 |
0.62 |
— |
4 |
0.62 |
0.5 |
2.75 |
2 |
|
1 |
4.25 |
0.56 |
2 |
1.94 |
0.69 |
0.69 |
— |
4 |
0.62 |
0.5 |
3.12 |
2 |
|
1 ¼ |
4.62 |
0.62 |
2.5 |
2.31 |
0.81 |
0.81 |
— |
4 |
0.62 |
0.5 |
3.5 |
3 |
|
1 ½ |
5 |
0.69 |
2.88 |
2.56 |
0.88 |
0.88 |
— |
4 |
0.62 |
0.5 |
3.88 |
3 |
|
2 |
6 |
0.75 |
3.62 |
3.06 |
1 |
1 |
— |
4 |
0.75 |
0.62 |
4.75 |
5 |
|
2 ½ |
7 |
0.88 |
4.12 |
3.56 |
1.12 |
1.12 |
— |
4 |
0.75 |
0.62 |
5.5 |
7 |
|
3 |
7.5 |
0.94 |
5 |
4.25 |
1.19 |
1.19 |
— |
4 |
0.75 |
0.62 |
6 |
8 |
|
3 ½ |
8.5 |
0.94 |
5.5 |
4.81 |
1.25 |
1.25 |
— |
8 |
0.75 |
0.62 |
7 |
11 |
|
4 |
9 |
0.94 |
6.19 |
5.31 |
1.31 |
1.31 |
— |
8 |
0.75 |
0.62 |
7.5 |
13 |
|
5 |
10 |
0.94 |
7.31 |
6.44 |
1.44 |
1.44 |
— |
8 |
0.88 |
0.75 |
8.5 |
15 |
|
6 |
11 |
1 |
8.5 |
7.56 |
1.56 |
1.56 |
— |
8 |
0.88 |
0.75 |
9.5 |
19 |
|
8 |
13.5 |
1.12 |
10.62 |
9.69 |
1.75 |
1.75 |
— |
8 |
0.88 |
0.75 |
11.75 |
30 |
|
10 |
16 |
1.19 |
12.75 |
12 |
1.94 |
1.94 |
— |
12 |
1 |
0.88 |
14.25 |
43 |
|
12 |
19 |
1.25 |
15 |
14.38 |
2.19 |
2.19 |
— |
12 |
1 |
0.88 |
17 |
64 |
|
14 |
21 |
1.38 |
16.25 |
15.75 |
2.25 |
2.25 |
— |
12 |
1.12 |
1 |
18.75 |
90 |
|
16 |
23.5 |
1.44 |
18.5 |
18 |
2.5 |
2.5 |
— |
16 |
1.12 |
1 |
21.25 |
98 |
|
18 |
25 |
1.56 |
21 |
19.88 |
2.69 |
2.69 |
— |
16 |
1.25 |
1.13 |
22.75 |
130 |
|
20 |
27.5 |
1.69 |
23 |
22 |
2.88 |
2.88 |
— |
20 |
1.25 |
1.12 |
25 |
165 |
|
24 |
32 |
1.88 |
27.25 |
26.12 |
3.25 |
3.25 |
— |
20 |
1.38 |
1.25 |
29.5 |
220 |
CLASS 300 According to ASTM A/SA-105; ANSI B16.5
Nominal
Pipe
Size
Outside
Diam. of
Flange (O)
Thick.
of
Flange (C)
Diam.
of
Raised Face
(R)
Diam.
of Hub
at Base
(X)
Length
thru Hub
(Y)
Min.
Thread
Length
(T)
Min.
Counter Bore
(Q)
No. of
Holes
Diam. of
Holes
Diam.
of Bolts
Diam.
of Bolt
Circle
Approx.
Weight
(in Pounds)
1/2
3.75
0.56
1.38
1.5
0.88
0.62
0.93
4
0.62
0.5
2.62
2
3/4
4.62
0.62
1.69
1.88
1
0.62
1.14
4
0.75
0.62
3.25
3
1
4.88
0.69
2
2.12
1.06
0.69
1.41
4
0.75
0.62
3.5
3
1 1/4
5.25
0.75
2.5
2.5
1.06
0.81
1.75
4
0.75
0.62
3.88
4
1 1/2
6.12
0.81
2.88
2.75
1.19
0.88
1.99
4
0.88
0.75
4.5
6
2
6.5
0.88
3.62
3.31
1.31
1.12
2.5
8
0.75
0.62
5
7
2 1/2
7.5
1
4.12
3.94
1.5
1.25
3
8
0.88
0.75
5.88
10
3
8.25
1.12
5
4.62
1.69
1.25
3.63
8
0.88
0.75
6.62
13
3 1/2
9
1.19
5.5
5.25
1.75
1.44
4.13
8
0.88
0.75
7.25
17
4
10
1.25
6.19
5.75
1.88
1.44
4.63
8
0.88
0.75
7.88
22
5
11
1.38
7.31
7
2
1.69
5.69
8
0.88
0.75
9.25
28
6
12.5
1.44
8.5
8.12
2.06
1.81
6.75
12
0.88
0.75
10.62
39
8
15
1.62
10.62
10.25
2.44
2
8.75
12
1
0.88
13
58
10
17.5
1.88
12.75
12.62
2.62
2.19
10.88
16
1.12
1
15.25
81
12
20.5
2
15
14.75
2.88
2.38
12.94
16
1.25
1.12
17.75
115
14
23
2.12
16.25
16.75
3
2.5
14.19
20
1.25
1.12
20.25
165
16
25.5
2.25
18.5
19
3.25
2.69
16.19
20
1.38
1.25
22.5
190
18
28
2.38
21
21
3.5
2.75
18.19
24
1.38
1.25
24.75
250
20
30.5
2.5
23
23.12
3.75
2.88
20.19
24
1.38
1.25
27
315
24
36
2.75
27.25
27.62
4.19
3.25
24.19
24
1.62
1.5
32
475
CLASS 600 According to ASTM A/SA-105; ANSI B16.5
Nominal
Pipe
Size
Outside
Diam. of
Flange (O)
Thick.
of
Flange
(C)
Diam.
of
Raised Face
(R)
Diam.
of Hub
at Base (X)
Length
thru Hub
(Y)
Min.
Thread
Length
(T)
Min.
Counter
Bore
(Q)
No. of
Holes
Diam. of
Holes
Diam. of
Bolts
Diam. of
Bolt Circle
Approx.
Weight
(in Pounds)
1/2
3.75
0.56
1.38
1.5
0.88
0.62
0.93
4
0.62
0.5
2.62
2
3/4
4.62
0.62
1.69
1.88
1
0.62
1.14
4
0.75
0.62
3.25
3
1
4.88
0.69
2
2.12
1.06
0.69
1.41
4
0.75
0.62
3.5
4
1 1/4
5.25
0.81
2.5
2.5
1.12
0.81
1.75
4
0.75
0.62
3.88
5
1 1/2
6.12
0.88
2.88
2.75
1.25
0.88
1.99
4
0.88
0.75
4.5
7
2
6.5
1
3.62
3.31
1.44
1.12
2.5
8
0.75
0.62
5
9
2 1/2
7.5
1.12
4.12
3.94
1.62
1.25
3
8
0.88
0.75
5.88
13
3
8.25
1.25
5
4.62
1.81
1.38
3.63
8
0.88
0.75
6.62
16
3 1/2
9
1.38
5.5
5.25
1.94
1.56
4.13
8
1
0.88
7.25
21
4
10.75
1.5
6.19
6
2.12
1.62
4.63
8
1
0.88
8.5
37
5
13
1.75
7.31
7.44
2.38
1.88
5.69
8
1.12
1
10.5
63
6
14
1.88
8.5
8.75
2.62
2
6.75
12
1.12
1
11.5
80
8
16.5
2.19
10.62
10.75
3
2.25
8.75
12
1.25
1.12
13.75
115
10
20
2.5
12.75
13.5
3.38
2.56
10.88
16
1.38
1.25
17
170
12
22
2.62
15
15.75
3.62
2.75
12.94
20
1.38
1.25
19.25
200
14
23.75
2.75
16.25
17
3.69
2.88
14.19
20
1.5
1.38
20.75
230
16
27
3
18.5
19.5
4.19
3.06
16.19
20
1.62
1.5
23.75
330
18
29.25
3.25
21
21.5
4.62
3.12
18.19
20
1.75
1.63
25.75
400
20
32
3.5
23
24
5
3.25
20.19
24
1.75
1.62
28.5
510
24
37
4
27.25
28.25
5.5
3.62
24.19
24
2
1.88
33
730
CLASS 900According to ASTM A/SA-105; ANSI B16.5
Nominal
Pipe
Size
Outside
Diam. of
Flange (O)
Thick.
of
Flange
(C)
Diam.
of
Raised Face
(R)
Diam.
of Hub
at Base
(X)
Length
thru Hub (Y)
Min.
Thread
Length
(T)
Min.
Counter
Bore
(Q)
No. of
Holes
Diam. of
Holes
Diam. of
Bolts
Diam. of
Bolt Circle
Approx.
Weight
(in Pounds)
1/2
4.75
0.88
1.38
1.5
1.25
0.88
0.93
4
0.88
0.75
3.25
4
3/4
5.12
1
1.69
1.75
1.38
1
1.14
4
0.88
0.75
3.5
5
1
5.88
1.12
2
2.06
1.62
1.12
1.41
4
1
0.88
4
8
1 1/4
6.25
1.12
2.5
2.5
1.62
1.19
1.75
4
1
0.88
4.38
9
1 1/2
7
1.25
2.88
2.75
1.75
1.25
1.99
4
1.12
1
4.88
12
2
8.5
1.5
3.62
4.12
2.25
1.5
2.5
8
1
0.88
6.5
25
2 1/2
9.62
1.62
4.12
4.88
2.5
1.88
3
8
1.12
1
7.5
36
3
9.5
1.5
5
5
2.12
1.62
3.63
8
1
0.88
7.5
26
4
11.5
1.75
6.19
6.25
2.75
1.88
4.63
8
1.25
1.12
9.25
53
5
13.75
2
7.31
7.5
3.12
2.12
5.69
8
1.38
1.25
11
83
6
15
2.19
8.5
9.25
3.38
2.25
6.75
12
1.25
1.12
12.5
110
8
18.5
2.5
10.62
11.75
4.00
2.50
8.75
12
1.5
1.38
15.5
170
10
21.5
2.75
12.75
14.5
4.25
2.81
10.88
16
1.5
1.38
18.5
245
12
24
3.12
15
16.5
4.62
3
12.94
20
1.5
1.38
21
325
14
25.25
3.38
16.25
17.75
5.12
3.25
14.19
20
1.62
1.5
22
400
16
27.75
3.5
18.5
20
5.25
3.38
16.19
20
1.75
1.63
24.25
425
18
31
4
21
22.25
6
3.5
18.19
20
2
1.88
27
600
20
33.75
4.25
23
24.5
6.25
3.62
20.19
20
2.12
2
29.5
730
24
41
5.5
27.25
29.5
8
4
24.19
20
2.62
2.5
35.5
1400
CLASS 1500 According to ASTM A/SA-105; ANSI B16.5
Nominal
Pipe
Size
Outside
Diam. of
Flange (O)
Thick.
of
Flange
(C)
Diam.
of
Raised Face
(R)
Diam.
of Hub
at Base
(X)
Length
thru Hub
(Y)
Min.
Thread
Length
(T)
Min.
Counter
Bore
(Q)
No. of
Holes
Diam. of
Holes
Diam. of
Bolts
Diam. of
Bolt Circle
Approx.
Weight
(in Pounds)
1/2
4.75
0.88
1.38
1.5
1.25
0.88
0.93
4
0.88
0.75
3.25
4
3/4
5.12
1
1.69
1.75
1.38
1
1.14
4
0.88
0.75
3.5
5
1
5.88
1.12
2
2.06
1.62
1.12
1.41
4
1
0.88
4
8
1 1/4
6.25
1.12
2.5
2.5
1.62
1.19
1.75
4
1
0.88
4.38
9
1 1/2
7
1.25
2.88
2.75
1.75
1.25
1.99
4
1.12
1
4.88
12
2
8.5
1.5
3.62
4.12
2.25
1.5
2.5
8
1
0.88
6.5
25
2 1/2
9.62
1.62
4.12
4.88
2.5
1.88
3
8
1.12
1
7.5
36
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Standard |
Specification |
|
ASTM A105 |
Standard Specification for Carbon Steel Forgings for Piping Applications |
|
ASTM A350 |
Standard Specification for Carbon and Low-Alloy Steel Forgings, Requiring Notch Toughness Testing for Piping Components |
|
ASTM A182 |
Standard Specification for Forged or Rolled Alloy and Stainless Steel Pipe Flanges, Forged Fittings, and Valves and Parts for High-Temperature Service |
|
ASTM A404 |
Specification for Forged or Rolled Alloy Steel Pip Flanges, Forged Fittings, and Valves and Parts Specially Heat Treated for High-Temperature Service (Withdrawn 1974) |
|
ASTM A234 |
Standard Specification for Piping Fittings of Wrought Carbon Steel and Alloy Steel for Moderate and High Temperature Service |
|
ASTM A420 |
Standard Specification for Piping Fittings of Wrought Carbon Steel and Alloy Steel for Low-Temperature Service |
|
ASTM A403 |
Standard Specification for Wrought Austenitic Stainless Steel Piping Fittings |
|
ASTM A694 |
Standard Specification for Carbon and Alloy Steel Forgings for Pipe Flanges, Fittings, Valves, and Parts for High-Pressure Transmission Service |
