Dimensions in Inches Weld Neck Flanges and Stud Bolts ASME B16.5 Class 300



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 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
1.1/4 5.25 0.69 2.5 1.66 2.5 3.88 3/4
1.1/2 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
2.1/2 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
3.1/2 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 1.1/4
14 23 2.06 16.75 14 5.56 20.25 1.1/4
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

Important Information



Stud Bolts for the flanges above

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
1.1/4 4 5/8 3.25
1.1/2 4 3/4 3.5
2 8 5/8 3.5
2.1/2 8 3/4 4
3 8 3/4 4.25
3.1/2 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 1.1/4 7.5
18 24 1.1/4 7.75
20 24 1.1/4 8
24 24 1.1/2 9

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