ASTM CLASS 300 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 3.75 0.56 1.38 2 2.63 4 0.63
3/4 4.63 0.63 1.69 3 3.25 4 0.75
1 4.88 0.69 2.00 3 3.50 4 0.75
1 1/4 5.25 0.75 2.50 4 3.88 4 0.75
1 1/2 6.13 0.81 2.88 6 4.50 4 0.88
2 6.50 0.88 3.63 8 5.00 8 0.75
2 1/2 7.50 1.00 4.13 12 5.88 8 0.88
3 8.25 1.13 5.00 16 6.63 8 0.88
3 1/2 9.00 1.19 5.50 21 7.25 8 0.88
4 10.00 1.25 6.19 27 7.88 8 0.88
5 11.00 1.38 7.31 35 9.25 8 0.88
6 12.50 1.44 8.50 50 10.63 12 0.88
8 15.00 1.63 10.63 81 13.00 12 1.00
10 17.50 1.88 12.75 124 15.25 16 1.13
12 20.50 2.00 15.00 185 17.75 16 1.25
14 23.00 2.13 16.25 250 20.25 20 1.25
16 25.50 2.25 18.50 295 22.50 20 1.38
18 28.00 2.38 21.00 395 24.75 24 1.38
20 30.50 2.50 23.00 505 27.00 24 1.38
22 33.00 2.63 25.25 640 29.25 24 1.63
24 36.00 2.75 27.25 790 32.00 24 1.63