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Forged Fittings - Welding Neck Flanges


technical-info-welding-neck-flanges

Welding Neck Flanges

Class 150 300 400 600 900 1500 2500
Diameter - A 30 38 38 38 38 38 43
Diameter - D 90 95 95 95 120 120 135
Thickness - B 9.6 12.7 14.3 14.3 22.3 22.3 30.2
11.2 14.3 20.7 20.7 28.7 28.7 36.6
Diameter - G 35.1 35.1 35.1 35.1 35.1 35.1 35.1
Diameter - K 60.3 66.7 66.7 66.7 82.6 82.6 88.9
Height - H 46 51 52 52 60 60 73
47.6 52.6 58.4 58.4 66.4 66.4 79.4
Bolt Holes 4 4 4 4 4 4 4
Diameter - L 15.9 15.9 15.9 15.9 22.2 22.2 22.2
Stud Bolts Diameter x Length
Diameter (in) 1/2 1/2 1/2 1/2 3/4 3/4 3/4
Length (mm) 55 65 75 75 110 110 120


Dimensional Tolerances of Welding Neck Flanges ASME B16.5

Outside Diameter
= 24 = 1.6 mm | > 24 = ± 3.2 mm
Inside Diameter
= 10 = ± 0.8 mm | 12 thru 18 = 1.6 mm | = 20 = + 3.2 mm / - 1.6 mm
Diameter of Contact Face
1.6 mm Raised Face = ± 0.8 mm
6.35 mm Raised Face, Tongue & Groove / Male-Female = ± 0.4 mm
Diameter of Hub at Base
= 24 = 1.6 mm | > 24 = ± 3.2 mm
Diameter of Hub at Point of Welding
= 5 = + 2.4 mm / - 0.8 mm | = 6 = + 4.0 mm / - 0.8 mm
Drilling
Bolt Circle = 1.6 mm | Bolt Hole Spacing = ± 0.8 mm
Eccentricity of Bolt Circle with Respect to Facing
= 2½ = 0.8 mm max. | = 3 = 1.6 mm max
Thickness
= 18 = + 3.2 mm / - 0 | = 20 = + 4.8 mm / - 0
Length thru Hub
= 10 = 1.6 mm | = 12 = ± 3.2 mm

 

Notes:

1. Dimensions are in millimeters unless otherwise indicated.
2. T = Nominal wall thickness of pipe. Bevel for Wall Thicknesses T from 5 mm to 22 mm inclusive.
3. The length of the stud bolt does not include the height of the chamfers (points).


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