Dimensions & Tolerances in Inches ASME B16.5

Dimensions in Inches Weld Neck Flanges & Stud Bolts according to ASME B16.5
Table Header
NPS
DIA
THK
DIA
DIA
HEIGHT
DIA
DIA
D
B
A
OD
H
K
L
1/2
3.5
0.38
1.19
0.84
1.81
2.38
5/8
3/4
3.88
0.44
1.5
1.05
2
2.75
5/8
1
4.25
0.5
1.94
1.32
2.12
3.12
5/8
4.62
0.56
2.31
1.66
2.19
3.5
5/8
5
0.62
2.56
1.9
2.38
3.88
5/8
2
6
0.69
3.06
2.38
2.44
4.75
3/4
7
0.81
3.56
2.88
2.69
5.5
3/4
3
7.5
0.88
4.25
3.5
2.69
6
3/4
8.5
0.88
4.81
4
2.75
7
3/4
4
9
0.88
5.31
4.5
2.94
7.5
3/4
5
10
0.88
6.44
5.56
3.44
8.5
7/8
6
11
0.94
7.56
6.63
3.44
9.5
7/8
8
13.5
1.06
9.69
8.63
3.94
11.75
7/8
10
16
1.12
12
10.75
3.94
14.25
1
12
19
1.19
14.38
12.75
4.44
17
1
14
21
1.31
15.75
14
4.94
18.75
1.1/8
16
23.5
1.38
18
16
4.94
21.25
1.1/8
18
25
1.5
19.88
18
5.44
22.75
20
27.5
1.62
22
20
5.62
25
24
32
1.81
26.12
24
5.94
29.5
1.3/8
NPS
D
B
A
OD
H
K
L
DIA
THK
DIA
DIA
HEIGHT
DIA
DIA
NPS NO OF BOLT HOLES DIA STUD BOLTS LENGTH STUD BOLTS
1/2
4
1/2
2.25
3/4
4
1/2
2.5
1
4
1/2
2.5
4
1/2
2.75
4
1/2
2.75
2
4
5/8
3.25
4
5/8
3.5
3
4
5/8
3.5
8
5/8
3.5
4
8
5/8
3.5
5
8
3/4
3.75
6
8
3/4
4
8
8
3/4
4.25
10
12
7/8
4.5
12
12
7/8
4.75
14
12
1
5.25
16
16
1
5.25
18
16
1.1/8
5.75
20
20
1.1/8
6.25
24
20
6.75
NPS
NO OF BOLT HOLES
DIA STUD BOLTS
LENGTH STUD BOLTS
Table Header
NPS
DIA
THK
DIA
DIA
HEIGHT
DIA
DIA
D
B
A
OD
H
K
L
1/2
3.75
0.5
1.5
0.84
2
2.62
5/8
3/4
4.62
0.56
1.88
1.05
2.19
3.25
3/4
1
4.88
0.62
2.12
1.32
2.38
3.5
3/4
5.25
0.69
2.5
1.66
2.5
3.88
3/4
6.12
0.75
2.75
1.9
2.63
4.5
7/8
2
6.5
0.81
3.31
2.38
2.69
5
3/4
7.5
0.94
3.94
2.88
2.94
5.88
7/8
3
8.25
1.06
4.62
3.5
3.06
6.62
7/8
9
1.12
5.25
4
3.13
7.25
7/8
4
10
1.19
5.75
4.5
3.32
7.88
7/8
5
11
1.31
7
5.56
3.82
9.25
7/8
6
12.5
1.38
8.12
6.63
3.82
10.62
7/8
8
15
1.56
10.25
8.63
4.32
13
1
10
17.5
1.81
12.62
10.75
4.56
15.25
1.1/8
12
20.5
1.94
14.75
12.75
5.06
17.75
14
23
2.06
16.75
14
5.56
20.25
16
25.5
2.19
19
16
5.69
22.5
1.3/8
18
28
2.31
21
18
6.19
24.75
1.3/8
20
30.5
2.44
23.12
20
6.32
27
1.3/8
24
36
2.69
27.62
24
6.56
32
1.5/8
NPS
D
B
A
OD
H
K
L
DIA
THK
DIA
DIA
HEIGHT
DIA
DIA
NPS NO OF BOLT HOLES DIA STUD BOLTS LENGTH STUD BOLTS
1/2
4
1/2
2.5
3/4
4
5/8
3
1
4
5/8
3
4
5/8
3.25
4
3/4
3.5
2
8
5/8
3.5
8
3/4
4
3
8
3/4
4.25
8
3/4
4.25
4
8
3/4
4.5
5
8
3/4
4.75
6
12
3/4
4.75
8
12
7/8
5.5
10
16
1
6.25
12
16
1.1/8
6.75
14
20
1.1/8
7
16
20
7.5
18
24
7.75
20
24
8
24
24
9
NPS
NO OF BOLT HOLES
DIA STUD BOLTS
LENGTH STUD BOLTS
Table Header
NPS
DIA
THK
DIA
DIA
HEIGHT
DIA
DIA
D
B
A
OD
H
K
L
1/2
3.75
0.56
1.5
0.84
2.06
2.62
5/8
3/4
4.62
0.62
1.88
1.05
2.25
3.25
3/4
1
4.88
0.69
2.12
1.32
2.44
3.5
3/4
5.25
0.81
2.5
1.66
2.62
3.88
3/4
6.12
0.88
2.75
1.9
2.75
4.5
7/8
2
6.5
1
3.31
2.38
2.88
5
3/4
7.5
1.12
3.94
2.88
3.12
5.88
7/8
3
8.25
1.25
4.62
3.5
3.25
6.62
7/8
9
1.38
5.25
4
3.38
7.25
1
4
10
1.38
5.75
4.5
3.5
7.88
1
5
11
1.5
7
5.56
4
9.25
1
6
12.5
1.62
8.12
6.63
4.06
10.62
1
8
15
1.88
10.25
8.63
4.62
13
1.1/8
10
17.5
2.12
12.62
10.75
4.88
15.25
12
20.5
2.25
14.75
12.75
5.38
17.75
1.3/8
14
23
2.38
16.75
14
5.88
20.25
1.3/8
16
25.5
2.5
19
16
6
22.5
18
28
2.62
21
18
6.5
24.75
20
30.5
2.75
23.12
20
6.62
27
1.5/8
24
36
3
27.62
24
6.88
32
1.7/8
NPS
D
B
A
OD
H
K
L
DIA
THK
DIA
DIA
HEIGHT
DIA
DIA
NPS NO OF BOLT HOLES DIA STUD BOLTS LENGTH STUD BOLTS
1/2
4
1/2
3
3/4
4
5/8
3.5
1
4
5/8
3.5
4
5/8
3.75
4
3/4
4.25
2
8
5/8
4.25
8
3/4
4.75
3
8
3/4
5
8
7/8
5.5
4
8
7/8
5.5
5
8
7/8
5.75
6
12
7/8
6
8
12
1
6.75
10
16
1.1/8
7.5
12
16
8
14
20
8.25
16
20
1.3/8
8.75
18
24
1.3/8
9
20
24
9.5
24
24
1.3/4
10.5
NPS
NO OF BOLT HOLES
DIA STUD BOLTS
LENGTH STUD BOLTS
Table Header
NPS
DIA
THK
DIA
DIA
HEIGHT
DIA
DIA
D
B
A
OD
H
K
L
1/2
3.75
0.56
1.5
0.84
2.06
2.62
5/8
3/4
4.62
0.62
1.88
1.05
2.25
3.25
3/4
1
4.88
0.69
2.12
1.32
2.44
3.5
3/4
5.25
0.81
2.5
1.66
2.62
3.88
3/4
6.12
0.88
2.75
1.9
2.75
4.5
7/8
2
6.5
1
3.31
2.38
2.88
5
3/4
7.5
1.12
3.94
2.88
3.12
5.88
7/8
3
8.25
1.25
4.62
3.5
3.25
6.62
7/8
9
1.38
5.25
4
3.38
7.25
1
4
10.75
1.5
6
4.5
4
8.5
1
5
13
1.75
7.44
5.56
4.5
10.5
1.1/8
6
14
1.88
8.75
6.63
4.62
11.5
1.1/8
8
16.5
2.19
10.75
8.63
5.25
13.75
10
20
2.5
13.5
10.75
6
17
1.3/8
12
22
2.62
15.75
12.75
6.12
19.25
1.3/8
14
23.75
2.75
17
14
6.5
20.75
16
27
3
19.5
16
7
23.75
1.5/8
18
29.25
3.25
21.5
18
7.25
25.75
1.3/4
20
32
3.5
24
20
7.5
28.5
1.3/4
24
37
4
28.25
24
8
33
2
NPS
D
B
A
OD
H
K
L
DIA
THK
DIA
DIA
HEIGHT
DIA
DIA
NPS NO OF BOLT HOLES DIA STUD BOLTS LENGTH STUD BOLTS
1/2
4
1/2
3
3/4
4
5/8
3.5
1
4
5/8
3.5
4
5/8
3.75
4
3/4
4.25
2
8
5/8
4.25
8
3/4
4.75
3
8
3/4
5
8
7/8
5.5
4
8
7/8
5.75
5
8
1
6.5
6
12
1
6.75
8
12
1.1/8
7.5
10
16
8.5
12
20
8.75
14
20
1.3/8
9.25
16
20
10
18
20
1.5/8
9.75
20
24
1.5/8
11.25
24
24
1.7/8
13
NPS
NO OF BOLT HOLES
DIA STUD BOLTS
LENGTH STUD BOLTS
Table Header
NPS
DIA
THK
DIA
DIA
HEIGHT
DIA
DIA
D
B
A
OD
H
K
L
1/2
4.75
0.88
1.5
0.84
2.38
3.25
7/8
3/4
5.12
1
1.75
1.05
2.75
3.5
7/8
1
5.88
1.12
2.06
1.32
2.88
4
1
6.25
1.12
2.5
1.66
2.88
4.38
1
7
1.25
2.75
1.9
3.25
4.88
1.1/8
2
8.5O
1.5
4.12
2.38
4
6.5
1
9.62
1.62
4.88
2.88
4.12
7.5
1.1/8
3
9.5
1.5
5
3.5
4
7.5
1
4
11.5
1.75
6.25
4.5
4.5
9.25
5
13.75
2
7.5
5.56
5
11
1.3/8
6
15
2.19
9.25
6.63
5.5
12.5
8
18.5
2.5
11.75
8.63
6.38
15.5
10
21.5
2.75
14.5
10.75
7.25
18.5
12
24
3.12
16.5
12.75
7.88
21
14
25.25
3.38
17.75
14
8.38
22
1.5/8
16
27.75
3.5
20
16
8.5
24.25
1.3/4
18
31
4
22.25
18
9
27
2
20
33.75
4.25
24.5
20
9.75
29.5
2.1/8
24
41
5.5
29.5
24
11.5
35.5
2.5/8
NPS
D
B
A
OD
H
K
L
DIA
THK
DIA
DIA
HEIGHT
DIA
DIA
NPS NO OF BOLT HOLES DIA STUD BOLTS LENGTH STUD BOLTS
1/2
4
3/4
4.25
3/4
4
3/4
4.5
1
4
7/8
5
4
7/8
5
4
1
5.5
2
8
7/8
5.75
8
1
6.25
3
8
7/8
5.75
4
8
1.1/8
6.75
5
8
7.5
6
12
1.1/8
7.5
8
12
1.3/8
8.75
10
16
1.3/8
9.25
12
20
1.3/8
10
14
20
10.75
16
20
1.5/8
11.25
18
20
1.7/8
12.75
20
20
2
13.75
24
20
17.25
NPS
NO OF BOLT HOLES
DIA STUD BOLTS
LENGTH STUD BOLTS
Table Header
NPS
DIA
THK
DIA
DIA
HEIGHT
DIA
DIA
D
B
A
OD
H
K
L
1/2
4.75
0.88
1.5
0.84
2.38
3.25
7/8
3/4
5.12
1
1.75
1.05
2.75
3.5
7/8
1
5.88
1.12
2.06
1.32
2.88
4
1
6.25
1.12
2.5
1.66
2.88
4.38
1
7
1.25
2.75
1.9
3.25
4.88
1.1/8
2
8.5O
1.5
4.12
2.38
4
6.5
1
9.62
1.62
4.88
2.88
4.12
7.5
1.1/8
3
10.5
1.88
5.25
3.5
4.62
8
4
12.25
2.12
6.38
4.5
4.88
9.5
1.3/8
5
14.75
2.88
7.75
5.56
6.12
11.5
1.5/8
6
15.5
3.25
9
6.63
6.75
12.5
8
19
3.62
11.5
8.63
8.38
15.5
1.3/4
10
23
4.25
14.5
10.75
10
19
2
12
26.5
4.88
17.75
12.75
11.12
22.5
2.1/8
14
29.5
5.25
19.5
14
11.75
25
2.3/8
16
32.5
5.75
21.75
16
12.25
27.75
2.5/8
18
36
6.38
23.5
18
12.88
30.5
2.7/8
20
38.75
7
25.25
20
14
32.75
3.1/8
24
46
8
30
24
16
39
3.5/8
NPS
D
B
A
OD
H
K
L
DIA
THK
DIA
DIA
HEIGHT
DIA
DIA
NPS NO OF BOLT HOLES DIA STUD BOLTS LENGTH STUD BOLTS
1/2
4
3/4
4.25
3/4
4
3/4
4.5
1
4
7/8
5
4
7/8
5
4
1
5.5
2
8
7/8
5.75
8
1
6.25
3
8
1.1/8
7
4
8
7.75
5
8
9.75
6
12
1.3/8
10.25
8
12
1.5/8
11.5
10
12
1.7/8
13.25
12
16
2
14.75
14
16
16
16
16
17.5
18
16
2.3/4
19.5
20
16
3
21.25
24
16
24.25
NPS
NO OF BOLT HOLES
DIA STUD BOLTS
LENGTH STUD BOLTS
Table Header
NPS
DIA
THK
DIA
DIA
HEIGHT
DIA
DIA
D
B
A
OD
H
K
L
1/2
5.25
1.19
1.69
0.84
2.88
3.5
7/8
3/4
5.5
1.25
2
1.05
3.12
3.75
7/8
1
6.25
1.38
2.25
1.32
3.5
4.25
1
7.25
1.5
2.88
1.66
3.75
5.12
1.1/8
8
1.75
3.12
1.9
4.38
5.75
2
9.25
2
3.75
2.38
5
6.75
1.1/8
10.5
2.25
4.5
2.88
5.62
7.75
3
12
2.62
5.25
3.5
6.62
9
1.3/8
4
14
3
6.5
4.5
7.5
10.75
1.5/8
5
16.5
3.62
8
5.56
9
12.75
1.7/8
6
19
4.25
9.25
6.63
10.75
14.5
2.1/8
8
21.75
5
12
8.63
12.5
17.25
2.1/8
10
26.5
6.5
14.75
10.75
16.5
21.25
2.5/8
12
30
7.25
17.38
12.75
18.25
24.38
2.7/8
NPS
D
B
A
OD
H
K
L
DIA
THK
DIA
DIA
HEIGHT
DIA
DIA
NPS NO OF BOLT HOLES DIA STUD BOLTS LENGTH STUD BOLTS
1/2
4
3/4
4.75
3/4
4
3/4
5
1
4
7/8
5.5
4
1
6
4
1.1/8
6.75
2
8
1
7
8
1.1/8
7.75
3
8
8.75
4
8
10
5
8
1.3/4
11.75
6
8
2
13.5
8
12
2
15
10
12
19.25
12
16
2.3/4
21.25
NPS
NO OF BOLT HOLES
DIA STUD BOLTS
LENGTH STUD BOLTS

Notes:

DIMENSIONAL TOLERANCES OF WELD NECK FLANGES ASME B16.5

OUTSIDE DIAMETER (NOTE 1)

≤24
0.06 in (1.6 mm)
>24
±0.12 in (±3.2 mm)

DIAMETER HUB AT BASE

≤24
0.06 in (1.6 mm)
>24
±0.12 in (±3.2 mm)

INSIDE DIAMETER

≤10
±0.03 in (±0.8 mm)
12 thru 18
0.06 in (1.6 mm)
≥20
±0.12 in / -0.06 in
(+3.2 mm / -1.6 mm)

DIAMETER HUB AT POINT OF WELDING

≤5
±0.09 in / -0.03 in
(+2.4 mm / -0.8 mm)
≥6
+0.15 in / -0.03 in
(+4.0 mm / -0.8 mm)

DRILLING

Bolt Circle
0.06 in (1.6 mm)
Bolt Hole Spacing
±0.03 in (±0.8 mm)

ECCENTRICITY BOLT CIRCLE

≤2½
0.03 in max (0.8 mm max)
≥3
0.06 in max (1.6 mm max)

THICKNESS

≤18
+0.12 in / -0 (+3.2 mm / -0)
≥20
+0.18 in / -0 (+4.8 mm / -0)

LENGTH THRU HUB

≤10
0.06 in (1.6 mm)
≥12
±0.12 in (±3.2 mm)

DIAMETER CONTACT FACE

0.06 in RF (1.6 mm)
±0.03 in (±0.8 mm)
0.25 in RF (6.35 mm)
±0.01 in (±0.4 mm)

Tongue & Groove
±0.01 in (±0.4 mm)
Male-Female
±0.01 in (±0.4 mm)

Welding bevel

0.03 in (1 mm)
0.07 in (2 mm)
0.23 in (6 mm)

Tolerances not listed in ASME B16.5�2013