Dimensions Weld Neck Flanges & Stud Bolts ASME B16.5



Weld Neck flange

OTHER DIAMETERS
1/2
3/4
1
2
3
4
5
6
8
10
12
14
16
18
20
24

NPS 14 - O.D. 355.0

CLass 150 300 600 900 1500 2500
DIA
A
400 425 432 451 495 ...
DIA
D
535 585 605 640 750 ...
THK
B
33.4 52.4 69.9 85.8 133.4 ...
35 54 76.3 92.2 139.8 ...
DIA
G
412.8 412.8 412.8 412.8 412.8 ...
DIA
K
476.3 514.4 527 558.8 635 ...
H 125 141 165 212 298 ...
126.6 142.6 171.4 219.4 304.4 ...
NO.
L
12 20 20 20 16 ...
DIA
L
28.6 31.8 38.1 41.3 60.3 ...
Stud Bolts Diameter x Length
DIA
(in)
1 1.1/8 1.3/8 1.1/2 2.1/4 ...
Lenght
(mm)
135 180 235 275 405 ...

Important Information

Notes..



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

Dimensional Tolerances of Weld Neck Flanges ASME B16.5

Outside Diameter *
Tolerances not listed in ASME B16.5 2013
≤24
1.6 mm (0.06 in)
>24
±3.2 mm (±0.12 in)
Diameter Hub at Base
≤24
1.6 mm (0.06 in)
>24
±3.2 mm (±0.12 in)
Inside Diameter
≤10
±0.8 mm (±0.03 in)
12 thru 18
1.6 mm (0.06 in)
≥20
+3.2 mm / -1.6 mm
(±0.12 in / -0.06 in)
Diameter Hub at Point of Welding
≤5
+2.4 mm / -0.8 mm
(±0.09 in / -0.03 in)
≥6
+4.0 mm / -0.8 mm
(+0.15 in / -0.03 in)
Drilling
Bolt Circle
1.6 mm (0.06 in)
Bolt Hole Spacing
±0.8 mm (±0.03 in)
Eccentricity Bolt Circle
≤2.1/2
0.8 mm max (0.03 in max)
≥3
1.6 mm max (0.06 in max)
Thickness
≤18
+3.2 mm / -0 (+0.12 in / -0)
≥20
+4.8 mm / -0 (+0.18 in / -0)
Length thru Hub
≤10
1.6 mm (0.06 in)
≥12
±3.2 mm (±0.12 in)
Diameter Contact Face
1.6 mm RF (0.06 in)
±0.8 mm (±0.03 in)
6.35 mm RF (0.25 in)
±0.4 mm (±0.01 in)

Tongue and Groove
±0.4 mm (±0.01 in)
Male-Female
±0.4 mm (±0.01 in)
Welding bevel