ASTM Class 300 THreaded Flanges

Nominal Pipe Size Outside Diameter (O) Thickness (T) Raised Face Diameter (R) Length Thru Hub (Y) Hub Diameter (X) Approximate Weight (lbs) Bolt Circle (C) Number of Holes Diameter of Holes
1/2 3.75 0.56 1.38 0.88 1.50 2 2.63 4 0.63
3/4 4.63 0.63 1.69 1.00 1.88 3 3.25 4 0.75
1 4.88 0.69 2.00 1.06 2.13 3 3.50 4 0.75
1 1/4 5.25 0.75 2.50 1.06 2.50 4 3.88 4 0.75
1 1/2 6.13 0.81 2.88 1.19 2.75 6 4.50 4 0.88
2 6.50 0.88 3.63 1.31 3.31 7 5.00 8 0.75
2 1/2 7.50 1.00 4.13 1.50 3.94 10 5.88 8 0.88
3 8.25 1.13 5.00 1.69 4.63 13 6.63 8 0.88
3 1/2 9.00 1.19 5.50 1.75 5.25 17 7.25 8 0.88
4 10.00 1.25 6.19 1.88 5.75 22 7.88 8 0.88
5 11.00 1.38 7.31 2.00 7.00 28 9.25 8 0.88
6 12.50 1.44 8.50 2.06 8.13 39 10.63 12 0.88
8 15.00 1.63 10.63 2.44 10.25 58 13.00 12 1.00
10 17.50 1.88 12.75 2.62 12.63 81 15.25 16 1.13
12 20.50 2.00 15.00 2.88 14.75 115 17.75 16 1.25
14 23.00 2.13 16.25 3.00 16.75 165 20.25 20 1.25
16 25.50 2.25 18.50 3.25 19.00 190 22.50 20 1.38
18 28.00 2.38 21.00 3.50 21.00 250 24.75 24 1.38
20 30.50 2.50 23.00 3.75 23.13 315 27.00 24 1.38
22 33.00 2.63 25.25 4.00 25.25 370 29.25 24 1.63
24 36.00 2.75 27.25 4.19 27.63 475 32.00 24 1.63