Industry Standard Class 350 Blind Flanges

Nominal Pipe SizeOutside Diameter (O)Thickness (T)Raised Face Diameter (R)Approximate Weight (lbs)Bolt Circle (C)Number of HolesDiameter of Bolt Holes
26 32.75 2.75 29.50 580 30.63 281.13
28 34.75 2.88 31.50 750 32.63 281.13
30 37.003.00 33.75 890 34.88 32 1.13
32 39.00 3.25 35.75 1050 36.88 36 1.13
34 41.00 3.38 37.75 122538.88 40 1.13
36 43.75 3.63 40.25 1500 41.50 40 1.25
3845.75 3.75 42.25 1700 43.50 40 1.25
40 47.75 4.0044.25 1975 45.50 44 1.25
42 50.00 4.13 46.50 222547.75 48 1.25
44 52.75 4.38 48.88 2625 50.25 44 1.38
4654.75 4.7550.88 295052.25 48 1.38
48 56.75 4.75 52.88 3300 54.25 48 1.38