× 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 6 NPS 8 NPS 10  ▸ NPS 12 NPS 14 NPS 16 NPS 18 NPS 20 NPS 24

Dimensions Lap Joint Flanges & Stud Bolts ASME B16.5

Lap Joint flange
OTHER DIA NPS 12 ID=328.2 r=13
CLass 150 300 600 900 1500 2500
DIA A 365 375 400 420 451 441
DIA D 485 520 560 610 675 760
THK B 31.8 50.8 66.7 79.4 123.9 184.2
DIA K 431.8 450.8 489 533.4 571.5 619.1
H 56 102 117 143 219 254
NO. L 12 16 20 20 16 12
DIA L 25.4 31.8 34.9 38.1 54 73
Stud Bolts Diameter x Length
DIA (in) 7/8 1.1/8 1.1/4 1.3/8 2 2.3/4
 lgth (mm 120 170 220 255 375 540

Notes..

  • Dimensions are in millimeters unless otherwise indicated.
  • The length of the Stud Bolt does not include the height of the chamfers (points).
  • IMPORTANT! please read this short article

Dimensional Tolerances of Lap Joint Flanges ASME B16.5
Outside Diameter *
Tolerances not listed in ASME B16.5 2013
≤ 24 = 1.6 mm
> 24 = ± 3.2 mm
Inside Diameter
≤ 10 = ± 0.8 mm
≥ 12 = + 1.6 mm / - 0 mm
Outside Diameter of Hub
≤ 12 = + 2.4 mm / - 1.6 mm
≥ 14 = ± 3.2 mm
Diameter of Counterbore
Same as for Inside Diameter
Drilling
Bolt Circle = 1.6 mm
Bolt Hole Spacing = ± 0.8 mm
Eccentricity of Bolt Circle
≤ 2.1/2 = 0.8 mm max.
≥ 3 = 1.6 mm max.
Thickness
≤ 18 = + 3.2 mm / - 0
≥ 20 = + 4.8 mm / - 0
Length thru Hub
≤ 18 = + 3.2 mm / - 0.8 mm
≥ 20 = + 4.8 mm / - 1.6 mm
Diameter of Contact Face
1.6 mm Raised Face = ± 0.8 mm
6.35 mm Raised Face
Tongue and Groove / Male-Female
± 0.4 mm


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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