Dimensions Weld Neck Flanges & Stud Bolts ASME B16.5



Weld Neck flange

OTHER DIAMETERS
1/2
3/4
1
2
2.1/2
3
4
5
6
8
10
12
14
16
18
20
24

NPS 2.1/2 - O.D. 73.0

CLass 150 300 600 900 1500 2500
DIA
A
90 100 100 125 125 114
DIA
D
180 190 190 245 245 265
THK
B
20.7 23.9 28.6 41.3 41.3 57.2
22.3 25.5 35 47.7 47.7 63.6
DIA
G
104.6 104.6 104.6 104.6 104.6 104.6
DIA
K
139.7 149.2 149.2 190.5 190.5 197
H 68 75 79 105 105 143
69.6 76.6 85.4 111.4 111.4 149.4
NO.
L
4 8 8 8 8 8
DIA
L
19.1 22.2 22.2 28.6 28.6 31.8
Stud Bolts Diameter x Length
DIA
(in)
5/8 3/4 3/4 1 1 1.1/8
Lenght
(mm)
90 100 120 160 160 195

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