ASTM Class 150 Blind Flanges

Nominal Pipe SizeOutside Diameter (O)Thickness (T)Raised Face Diameter (R)Approximate Weight (lbs)Bolt Circle (C)Number of HolesDiameter of Holes
1/2 3.50 0.44 1.38 1 2.38 4 0.63
3/4 3.88 0.50 1.69 2 2.75 4 0.63
1 4.25 0.56 2.00 2 3.13 4 0.63
1 1/4 4.63 0.63 2.50 3 3.50 4 0.63
1 1/2 5.00 0.69 2.88 4 3.88 4 0.63
2 6.00 0.75 3.63 5 4.75 4 0.75
2 1/2 7.00 0.88 4.13 7 5.50 4 0.75
3 7.50 0.94 5.00 9 6.00 4 0.75
3 1/2 8.50 0.94 5.50 13 7.00 8 0.75
4 9.00 0.94 6.19 17 7.50 8 0.75
5 10.00 0.94 7.31 20 8.50 8 0.88
6 11.00 1.00 8.50 26 9.50 8 0.88
8 13.50 1.13 10.63 45 11.75 8 0.88
10 16.00 1.19 12.75 70 14.25 12 1.00
12 19.00 1.25 15.00 110 17.00 12 1.00
14 21.00 1.38 16.25 140 18.75 12 1.13
16 23.50 1.44 18.50 180 21.25 16 1.13
18 25.00 1.56 21.00 220 22.75 16 1.25
20 27.50 1.69 23.00 285 25.00 20 1.25
22 29.50 1.81 25.25 355 27.25 20 1.38
24 32.00 1.88 27.25 430 29.50 20 1.38