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 10 - O.D. 273.0

CLass 150 300 600 900 1500 2500
DIA
A
305 321 345 368 368 375
DIA
D
405 445 510 545 585 675
THK
B
28.6 46.1 63.5 69.9 108 165
30.2 47.7 69.9 76.3 114.4 171.5
DIA
G
323.9 323.9 323.9 323.9 323.9 323.9
DIA
K
362 387.4 431.8 469.9 485 539.7
H 100 116 152 184 254 419
101.6 117.6 158.4 190.4 260.4 425.4
NO.
L
12 16 16 16 12 12
DIA
L
25.4 28.6 34.9 38.1 50.8 66.7
Stud Bolts Diameter x Length
DIA
(in)
7/8 1 1.1/4 1.3/8 1.7/8 2.1/2
Lenght
(mm)
115 160 215 235 335 490

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