× 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 Blind Flanges & Stud Bolts ASME B16.5

Blind flange
OTHER DIA NPS 2.1/2
CLass 150 300 600 900 1500 2500
DIA D 180 190 190 245 245 265
B 22.3 25.5 35 47.7 47.7 63.6
DIA G 104.6 104.6 104.6 104.6 104.6 104.6
DIA K 139.7 149.2 149.2 190.5 190.5 197
NO. L 4 8 8 8 8 8
DIA L 19.1 22.2 22.2 28.6 28.6 31.8
Stud Bolts Diameter x Length
DIA (in) 5/8 3/4 3/4 1 1 1.1/8
 lgth (mm 90 100 120 160 160 195

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 Blind Flanges ASME B16.5

Outside Diameter *
Tolerances not listed in ASME B16.5 2013
≤ 24 = 1.6 mm
> 24 = ± 3.2 mm
Inside Diameter
not applicable
Outside Diameter of Hub
≤ 12 = + 2.4 mm / - 1.6 mm
≥ 14 = ± 3.2 mm
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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