× NPS 1/2  ▸ NPS 3/4 NPS 1 NPS 1.1/4 NPS 1.1/2 NPS 2 NPS 2.1/2

Dimensions Threaded Flanges & Stud Bolts ASME B16.5

Threaded flange
OTHER DIA NPS 3/4
CLass 150 300 600 900 1500 2500
DIA A 38 48 48 44 44 51
DIA D 100 115 115 130 130 140
THK B 12.8 15.9 22.3 31.8 31.8 38.2
DIA G 42.9 42.9 42.9 42.9 42.9 42.9
DIA K 69.9 82.6 82.6 88.9 88.9 95.2
H 15.6 25.6 31.4 41.4 41.4 49.4
NO. L 4 4 4 4 4 4
DIA L 15.9 19.1 19.1 22.2 22.2 22.2
Stud Bolts Diameter x Length
DIA (in) 1/2 5/8 5/8 3/4 3/4 3/4
 lgth (mm 65 75 90 115 115 125

Notes..

  • Dimensions are in millimeters unless otherwise indicated.
  • The length of the Stud Bolt does not include the height of the chamfers (points).
  • The length of the Stud Bolts includes one Spiral Wound Gasket with a 4.5mm thick sealing element, which is compressed to 3mm while tightening the Raised Face flange connection.
  • Important! please read this short article

Dimensional Tolerances of Threaded Flanges ASME B16.5
Outside Diameter *
Tolerances not listed in ASME B16.5 2013
≤ 24 = 1.6 mm
> 24 = ± 3.2 mm
Inside Diameter
Within Limits on Boring Gauge
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.
Outside Diameter of Hub
≤ 12 = + 2.4 mm / - 1.6 mm
≥ 14 = ± 3.2 mm
Diameter of Counterbore
Same as forInside Diameter
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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