Industry Standard Class 125/150 Weld Neck Flanges

Nominal Pipe SizeOutside Diameter (O)Thickness (T)Overall Thickness (Y)Point of Weld (A)Hub Diameter (X)Inside Diameter (B)Approximate Weight (lbs)Number of Bolt HolesDiameter of Bolt Circle (C)Diameter of Bolt Circle (C)
26 34.25 2.00 5.00 26 28.50 Specified by purchaser 260 24 1.38 31.75
28 36.50 2.06 5.06 28 30.75 Specified by purchaser 295 281.38 34.00
30 38.75 2.13 5.13 30 32.75Specified by purchaser 340 28 1.38 36.00
32 41.75 2.25 5.25 3235.00 Specified by purchaser 410 28 1.63 38.50
34 43.75 2.38 5.31 36 37.00 Specified by purchaser 440 32 1.63 40.50
36 46.002.38 5.38 36 39.25 Specified by purchaser 495 32 1.63 42.75
3848.75 2.50 5.38 38 41.75Specified by purchaser 570 32 1.63 45.25
40 50.75 2.50 5.50 40 43.75 Specified by purchaser 62036 1.63 47.25
42 53.00 2.635.63 42 46.00 Specified by purchaser 710 36 1.63 49.50
44 55.25 2.63 5.63 44 48.00 Specified by purchaser 750 40 1.63 51.75
46 57.25 2.69 5.69 46 50.00 Specified by purchaser 800 401.63 53.75
48 59.50 2.75 5.75 48 52.25 Specified by purchaser 870 44 1.63 56.00
5061.75 2.75 5.75 50 54.25 Specified by purchaser 900 44 1.88 58.25
52 64.002.88 5.88 52 56.50 Specified by purchaser 1000 44 1.88 60.50
54 66.25 3.00 6.00 54 58.75 Specified by purchaser 1100 52 1.88 62.75
60 73.00 3.13 6.13 60 65.25 Specified by purchaser 1350 52 1.88 69.25
66 80.00 3.38 6.38 66 71.50 Specified by purchaser 1775 60 1.88 76.00
72 86.50 3.50 6.50 72 78.50 Specified by purchaser 2100 64 1.88 82.50
84 99.75 3.88 6.88 84 90.50 Specified by purchaser 2825 2.13 95.50
96 113.25 4.257.25 96102.75 Specified by purchaser 3800 68 2.38 108.50