Dimensions Weld Neck Flanges & Stud Bolts ASME B16.5



Weld Neck flange

OTHER DIAMETERS

NPS 5 - O.D. 141.3

CLass 150 300 600 900 1500 2500
DIA
A
164 180 189 190 197 205
DIA
D
255 280 330 350 375 420
THK
B
22.3 33.4 44.5 50.8 73.1 92.1
23.9 35 50.9 57.2 79.5 98.5
DIA
G
185.7 185.7 185.7 185.7 185.7 185.7
DIA
K
215.9 235 266.7 279.4 290 323.8
H 87 97 114 127 156 226
88.6 98.6 120.4 133.4 162.4 232.4
NO.
L
8 8 8 8 8 8
DIA
L
22.2 22.2 28.6 34.9 41.3 47.6
Stud Bolts Diameter x Length
DIA
(in)
3/4 3/4 1 1.1/4 1.1/2 1.3/4
Lenght
(mm)
95 120 165 190 250 300

Important Information

Notes..

  • Dimensions are in millimeters unless otherwise indicated.
  • The length of the Stud Bolt does not include the height of the chamfers (points).
  • ID = Depending on the wall thickness of the pipe, must be specified by the purchaser.

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


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


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