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 8 - O.D. 219.0

CLass 150 300 600 900 1500 2500
DIA
A
246 260 272 298 290 305
DIA
D
345 380 420 470 485 550
THK
B
27 39.7 55.6 63.5 92.1 127
28.6 41.3 62 69.9 98.5 133.4
DIA
G
269.7 269.7 269.7 269.7 269.7 269.7
DIA
K
298.5 330.2 349.2 393.7 395 438.1
H 100 110 133 162 213 318
101.6 111.6 139.4 168.4 219.4 324.4
NO.
L
8 12 12 12 12 12
DIA
L
22.2 25.4 31.8 38.1 44.5 54
Stud Bolts Diameter x Length
DIA
(in)
3/4 7/8 1.1/8 1.3/8 1.5/8 2
Lenght
(mm)
110 140 190 220 290 380

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