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 4 - O.D. 114.3

CLass 150 300 600 900 1500 2500
DIA
A
135 146 152 160 162 165
DIA
D
230 255 275 290 310 355
THK
B
22.3 30.2 38.1 44.5 54 76.2
23.9 31.8 44.5 50.9 60.4 82.6
DIA
G
157.2 157.2 157.2 157.2 157.2 157.2
DIA
K
190.5 200 215.9 235 240 273
H 75 84 102 114 124 190
76.6 85.6 108.4 120.4 130.4 196.4
NO.
L
8 8 8 8 8 8
DIA
L
19.1 22.2 25.4 31.8 34.9 41.3
Stud Bolts Diameter x Length
DIA
(in)
5/8 3/4 7/8 1.1/8 1.1/4 1.1/2
Lenght
(mm)
90 115 145 170 195 255

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