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Flange Guide

Dimensions in Inches Weld Neck Flanges and Stud Bolts ASME B16.5 Class 150

Weld Neck flange

Important Information

Other Pressure Classes

150 |
300 |
400 |
600 |
900 |
NPS DIA
D
THK
B
DIA
A
DIA
OD
HEIGHT
H
DIA
K
DIA
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
1.1/4 4.62 0.56 2.31 1.66 2.19 3.5 5/8
1.1/2 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
2.1/2 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
3.1/2 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 1.1/4
20 27.5 1.62 22 20 5.62 25 1.1/4
24 32 1.81 26.12 24 5.94 29.5 1.3/8
Weld Neck flange
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
1.1/4 4 1/2 2.75
1.1/2 4 1/2 2.75
2 4 5/8 3.25
2.1/2 4 5/8 3.5
3 4 5/8 3.5
3.1/2 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 1.1/4 6.75

Notes:

Measuring lengths of Stud Bolts and Hex bolts
Dimensional Tolerances of Weld Neck Flanges ASME B16.5
Outside Diameter *
Tolerances not listed in ASME B16.5 2013
≤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
≤2.1/2
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 and Groove
±0.01 in (±0.4 mm)
Male-Female
±0.01 in (±0.4 mm)
Welding bevel

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