ASME/ANSI B16.5 - Flanges and Bolt Dimensions Class 150 to 2500 (Download PDF Also)

Rizwanulla Patan June 09, 2020

Flange dimensions are determined by pipe size and pressure class required for the application. Most of these dimensions have been standardized and published as ASME, MSS, API or other standardization organization specifications. ASME/ANSI B16.5 provides dimensions and tolerances for flanges in pipe sizes from 1/2″ through 24″ and in classes ranging 150 through 2500.


ASME/ANSI B16.5 provides :-
  • Weld neck
  • Slip-on
  • Socket weld
  • Threaded
  • Lap joint
  • Blind
Flange dimensions for pipes ranging 1/2" to 24" - in classes ranging 150 to 2500.


Nominal Pipe Size
NPS
(inches)
Class 150
Diameter of
Flange
(inches)
No.
of
Bolts
Diameter of
Bolts
(inches)
Diameter of
Bolt Holes
(inches)
Bolt
Circle
(inches)
1/4
3-3/8
4
1/2
0.62
2-1/4
1/2
3-1/2
4
1/2
0.62
2-3/8
3/4
3-7/8
4
1/2
0.62
2-3/4
1
4-1/4
4
1/2
0.62
3-1/8
1-1/4
4-5/8
4
1/2
0.62
3-1/2
1-1/2
5
4
1/2
0.62
3-7/8
2
6
4
5/8
0.75
4-3/4
2-1/2
7
4
5/8
0.75
5-1/2
3
7-1/2
4
5/8
0.75
6
3-1/2
8-1/2
8
5/8
0.75
7
4
9
8
5/8
0.75
7-1/2
5
10
8
3/4
0.88
8-1/2
6
11
8
3/4
0.88
9-1/2
8
13-1/2
8
3/4
0.88
11-3/4
10
16
12
7/8
1
14-1/4
12
19
12
7/8
1
17
14
21
12
1
1.12
18-3/4
16
23-1/2
16
1
1.12
21-1/4
18
25
16
1-1/8
1.25
22-3/4
20
27-1/2
20
1-1/8
1.25
25
24
32
20
1-1/4
1.38
29-1/2


Nominal Pipe Size
NPS
(inches)
Class 3001.25
Diameter of
Flange
(inches)
No.
of
Bolts
Diameter of
Bolts
(inches)
Diameter of
Bolt Holes
(inches)
Bolt
Circle
(inches)
1/4
3-3/8
4
1/2
0.62
2-1/4
1/2
3-3/4
4
1/2
0.62
2-5/8
3/4
4-5/8
4
5/8
0.75
3-1/4
1
4-7/8
4
5/8
0.75
3-1/2
1-1/4
5-1/4
4
5/8
0.75
3-7/8
1-1/2
6-1/8
4
3/4
0.88
4-1/2
2
6-1/2
8
5/8
0.75
5
2-1/2
7-1/2
8
3/4
0.88
5-7/8
3
8-1/4
8
3/4
0.88
6-5/8
3-1/2
9
8
3/4
0.88
7-1/4
4
10
8
3/4
0.88
7-7/8
5
11
8
3/4
0.88
9-1/4
6
12-1/2
12
3/4
0.88
10-5/8
8
15
12
7/8
1
13
10
17-1/2
16
1
1.12
15-1/4
12
20-1/2
16
1-1/8
1.25
17-3/4
14
23
20
1-1/8
1.25
20-1/4
16
25-1/2
20
1-1/4
1.38
22-1/2
18
28
24
1-1/4
1.38
24-3/4
20
30-1/2
24
1-1/4
1.38
27
24
36
24
1-1/2
1.62
32


Nominal Pipe Size
NPS
(inches)
Class 400
Diameter of
Flange
(inches)
No.
of
Bolts
Diameter of
Bolts
(inches)
Diameter of
Bolt Holes
(inches)
Bolt
Circle
(inches)
1/4
3-3/8
4
1/2
0.62
2-1/4
1/2
3-3/4
4
1/2
0.62
2-5/8
3/4
4-5/8
4
5/8
0.75
3-1/4
1
4-7/8
4
5/8
0.75
3-1/2
1-1/4
5-1/4
4
5/8
0.75
3-7/8
1-1/2
6-1/8
4
3/4
0.88
4-1/2
2
6-1/2
8
5/8
0.75
5
2-1/2
7-1/2
8
3/4
0.88
5-7/8
3
8-1/4
8
3/4
0.88
6-5/8
3-1/2
9
8
7/8
1
7-1/4
4
10
8
7/8
1
7-7/8
5
11
8
7/8
1
9-1/4
6
12-1/2
12
7/8
1
10-5/8
8
15
12
1
1.12
13
10
17-1/2
16
1-1/8
1.25
15-1/4
12
20-1/2
16
1-1/4
1.38
17-3/4
14
23
20
1-1/4
1.38
20-1/4
16
25-1/2
20
1-3/8
1.5
22-1/2
18
28
24
1-3/8
1.5
24-3/4
20
30-1/2
24
1-1/2
1.62
27
24
36
24
1-3/4
1.88
32

Nominal Pipe Size
NPS
(inches)
Class 600
Diameter of
Flange
(inches)
No.
of
Bolts
Diameter of
Bolts
(inches)
Diameter of
Bolt Holes
(inches)
Bolt
Circle
(inches)
1/4
3-3/8
4
1/2
0.62
2-1/4
1/2
3-3/4
4
1/2
0.62
2-5/8
3/4
4-5/8
4
5/8
0.75
3-1/4
1
4-7/8
4
5/8
0.75
3-1/2
1-1/4
5-1/4
4
5/8
0.75
3-7/8
1-1/2
6-1/8
4
3/4
0.88
4-1/2
2
6-1/2
8
5/8
0.75
5
2-1/2
7-1/2
8
3/4
0.88
5-7/8
3
8-1/4
8
3/4
0.88
6-5/8
3-1/2
9
8
7/8
1
7-1/4
4
10-3/4
8
7/8
1
8-1/2
5
13
8
1
1.12
10-1/2
6
14
12
1
1.12
11-1/2
8
16-1/2
12
1-1/8
1.25
13-3/4
10
20
16
1-1/4
1.38
17
12
22
20
1-1/4
1.38
19-1/4
14
23-3/4
20
1-3/8
1.5
20-3/4
16
27
20
1-1/2
1.62
23-3/4
18
29-1/4
20
1-5/8
1.75
25-3/4
20
32
24
1-5/8
1.75
28-1/2
24
37
24
1-7/8
2
33


Nominal Pipe Size
NPS
(inches)
Class 900
Diameter of
Flange
(inches)
No.
of
Bolts
Diameter of
Bolts
(inches)
Diameter of
Bolt Holes
(inches)
Bolt
Circle
(inches)
1/2
4-3/4
4
3/4
0.88
3-1/4
3/4
5-1/8
4
3/4
0.88
3-1/2
1
5-7/8
4
7/8
1
4
1-1/4
6-1/4
4
7/8
1
4-3/8
1-1/2
7
4
1
1.12
4-7/8
2
8-1/2
8
7/8
1
6-1/2
2-1/2
9-5/8
8
1
1.12
7-1/2
3
9-1/2
8
7/8
1
7-1/2
4
11-1/2
8
1-1/8
1.25
9-1/4
5
13-3/4
8
1-1/4
1.38
11
6
15
12
1-1/8
1.25
12-1/2
8
18-1/2
12
1-3/8
1.5
15-1/2
10
21-1/2
16
1-3/8
1.5
18-1/2
12
24
20
1-3/8
1.5
21
14
25-1/4
20
1-1/2
1.62
22
16
27-3/4
20
1-5/8
1.75
24-1/2
18
31
20
1-7/8
2
27
20
33-3/4
20
2
2.12
29-1/2
24
41
20
2-1/2
2.62
35-1/2


Nominal Pipe Size
NPS
(inches)
Class 1500
Diameter of
Flange
(inches)
No.
of
Bolts
Diameter of
Bolts
(inches)
Diameter of
Bolt Holes
(inches)
Bolt
Circle
(inches)
1/2
4-3/4
4
3/4
0.88
3-1/4
3/4
5-1/8
4
3/4
0.88
3-1/2
1
5-7/8
4
7/8
1
4
1-1/4
6-1/4
4
7/8
1
4-3/8
1-1/2
7
4
1
1.12
4-7/8
2
8-1/2
8
7/8
1
6-1/2
2-1/2
9-5/8
8
1
1.12
7-1/2
3
10-1/2
8
1-1/8
1.25
8
4
12-1/4
8
1-1/4
1.38
9-1/2
5
14-3/4
8
1-1/2
1.62
11-1/2
6
15-1/2
12
1-3/8
1.5
12-1/2
8
19
12
1-5/8
1.75
15-1/2
10
23
12
1-7/8
2
19
12
26-1/2
16
2
2.12
22-1/2
14
29-1/2
16
2-1/4
2.38
25
16
32-1/2
16
2-1/2
2.62
27-3/4
18
36
16
2-3/4
2.88
30-1/2
20
38-3/4
16
3
3.12
32-3/4
24
46
16
3-1/2
3.62
39


Nominal Pipe Size
NPS
(inches)
Class 2500
Diameter of
Flange
(inches)
No.
of
Bolts
Diameter of
Bolts
(inches)
Diameter of
Bolt Holes
(inches)
Bolt
Circle
(inches)
1/2
5-1/4
4
3/4
0.88
3-1/2
3/4
5-1/2
4
3/4
0.88
3-3/4
1
6-1/4
4
7/8
1
4-1/4
1-1/4
7-1/4
4
1
1.12
5-1/8
1-1/2
8
4
1-1/8
1.25
5-3/4
2
9-1/4
8
1
1.12
6-3/4
2-1/2
10-1/2
8
1-1/8
1.25
7-3/4
3
12
8
1-1/4
1.38
9
4
14
8
1-1/2
1.62
10-3/4
5
16-1/2
8
1-3/4
1.88
12-3/4
6
19
8
2
2.12
14-1/2
8
21-3/4
12
2
2.12
17-1/4
10
26-1/2
12
2-1/2
2.62
21-1/4
12
30
12
2-3/4
2.88
24-3/8





General notes:
  • Dimensions are in millimeters unless otherwise indicated.
  • Length dimensional tolerances for all Stud Bolts:
  • length to 12 inch tolerance = ± 1.6 mm
  • length over 12 inch to 18 inch tolerance = ± 3.2 mm
  • length over 18 inch tolerance = ± 6.4 mm
  • The length of the Stud Bolt does not include the height of the chamfers (points).
Download ASME/ANSI B16.5 - Flanges and Bolt Dimensions Class 150 to 2500 From Below Link

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