Dimensions in Inches Weld Neck Flanges and Stud Bolts ASME B16.5 Class 900



Weld Neck flange

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 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
1.1/4 6.25 1.12 2.5 1.66 2.88 4.38 1
1.1/2 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
2.1/2 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 1.1/4
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 1.1/4
8 18.5 2.5 11.75 8.63 6.38 15.5 1.1/2
10 21.5 2.75 14.5 10.75 7.25 18.5 1.1/2
12 24 3.12 16.5 12.75 7.88 21 1.1/2
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

Important Information



Stud Bolts for the flanges above

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
1.1/4 4 7/8 5
1.1/2 4 1 5.5
2 8 7/8 5.75
2.1/2 8 1 6.25
3 8 7/8 5.75
4 8 1.1/8 6.75
5 8 1.1/4 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 1.1/2 10.75
16 20 1.5/8 11.25
18 20 1.7/8 12.75
20 20 2 13.75
24 20 2.1/2 17.25

Notes..


Dimensional Tolerances
Weld Neck Flanges ASME B16.5

Welding bevel

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)


Studs are measured parallel to the axis (L) from the first to the thread without the chamfers (points). S = free threads equals 1/3 time bolt dia

Measuring lengths of Stud Bolts


Hex bolts are measured from under the head to the top of de bolt


Measuring lengths of Hex bolts