× NPS 1/2 NPS 3/4 NPS 1 NPS 1.1/4 NPS 1.1/2 NPS 2 NPS 2.1/2 NPS 3 NPS 3.1/2 NPS 4 NPS 5 NPS 6 NPS 8 NPS 10 NPS 12  ▸ NPS 14 NPS 16 NPS 18 NPS 20 NPS 24

Dimensions Weld Neck Flanges & Stud Bolts ASME B16.5

Weld Neck flange
OTHER DIA NPS 14 - O.D. 355.0
CLass 150 300 600 900 1500 2500
DIA A 400 425 432 451 495 ...
DIA D 535 585 605 640 750 ...
THK B 35 54 76.3 92.2 139.8 ...
DIA G 412.8 412.8 412.8 412.8 412.8 ...
DIA K 476.3 514.4 527 558.8 635 ...
H 126.6 142.6 171.4 219.4 304.4 ...
NO. L 12 20 20 20 16 ...
DIA L 28.6 31.8 38.1 41.3 60.3 ...
Stud Bolts Diameter x Length
DIA (in) 1 1.1/8 1.3/8 1.1/2 2.1/4 ...
 lgth (mm 135 180 235 275 405 ...

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.
  • IMPORTANT! please read this short article

Dimensional Tolerances of Weld Neck Flanges ASME B16.5
Welding bevel
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)


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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