Weld Neck Flanges have a long tapered hub and are butt-welded to the pipe, providing excellent stress distribution and strength.

Key Features

Ideal for high-pressure, high-temperature systems
Smooth bore for uninterrupted flow
Excellent fatigue resistance

Applications

Used in power plants, refineries, and chemical industries.
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Dimension Weld Neck Flange (ASME B16.5)

Class 150 300 600 900 1500 2500
Diameter - A 30 38 38 38 38 43
Diameter - D 90 95 95 120 120 135
Thickness - B 9.6 12.7 14.3 22.3 22.3 30.2
11.2 14.3 20.7 28.7 28.7 36.6
Diameter - G 35.1 35.1 35.1 35.1 35.1 35.1
Diameter - K 60.3 66.7 66.7 82.6 82.6 88.9
Height - H 46 51 52 60 60 73
47.6 52.6 58.4 66.4 66.4 79.4
NO. L 4 4 4 4 4 4
Diameter - L 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 3/4 3/4 3/4
Length (mm) 55 65 75 110 110 120