BLIND FLANGES ASME B16.5 Class 300

Nominal
Size
NPS
Outside
Diameter
of
Flange
Thickness
of
Flange
Diameter Of Raised
Face (1)
Number of
Bolt Holes
Diameter
of
Bolt
Holes
Diameter
of
Bolts
Diameter
of
Bolt
Circle
Approx.
Weight

Pounds
Kg

O C R
½ in. 3.75 0.56 1.38 4 0.62 ½ 2.62 2
mm 95.3 14.2 35.1 15.7 12.7 66.5 1
¾ in. 4.62 0.62 1.69 4 0.75  5/8 3.25 3
mm 117.3 15.7 42.9 19.1 15.9 82.6 1
1 in. 4.88 0.69 2 4 0.75  5/8 3.5 3
mm 124 17.5 50.8 19.1 15.9 88.9 1
1 ¼  in. 5.25 0.75 2.5 4 0.75  5/8 3.88 4
mm 133.4 19.1 63.5 19.1 15.9 98.6 2
1 ½  in. 6.12 0.81 2.88 4 0.88 ¾ 4.5 6
mm 155.4 20.6 73.2 22.4 19.1 114.3 3
2 in. 6.5 0.88 3.62 8 0.75  5/8 5 8
mm 165.1 22.4 91.9 19.1 15.9 127 4
2 ½  in. 7.5 1 4.12 8 0.88 ¾ 5.88 12
mm 190.5 25.4 104.6 22.4 19.1 149.4 5
3 in. 8.25 1.12 5 8 0.88 ¾ 6.62 16
209.6 28.4 127 22.4 19.1 168.1 7
3 ½ in. 9 1.19 5.5 8 0.88 ¾ 7.25 21
mm 228.6 30.2 139.7 22.4 19.1 184.2 10
4 in. 10 1.25 6.19 8 0.88 ¾ 7.88 27
mm 254 31.8 157.2 22.4 19.1 200.2 12
5 in. 11 1.38 7.31 8 0.88 ¾ 9.25 35
mm 279.4 35.1 185.7 22.4 19.1 235 16
6 in. 12.5 1.44 8.5 12 0.88 ¾ 10.62 50
mm 317.5 36.6 215.9 22.4 19.1 269.7 23
8 in. 15 1.62 10.62 12 1  7/8 13 81
mm 381 41.1 269.7 25.4 22.2 330.2 37
10 in. 17.5 1.88 12.75 16 1.12 1 15.25 124
mm 444.5 47.8 323.9 28.4 25.4 387.4 56
12 in. 20.5 2 15 16 1.25 1 1/8 17.75 185
mm 520.7 50.8 381 31.8 28.6 450.9 84
14 in. 23 2.12 16.25 20 1.25 1 1/8 20.25 250
mm 584.2 53.8 412.8 31.8 28.6 514.4 113
16 in. 25.5 2.25 18.5 20 1.38 1 ¼ 22.5 295
mm 647.7 57.2 469.9 35.1 31.8 571.5 134
18 in. 28 2.38 21 24 1.38 1 ¼ 24.75 395
mm 711.2 60.5 533.4 35.1 31.8 628.7 179
20 in. 30.5 2.5 23 24 1.38 1 ¼ 27 505
mm 774.7 63.5 584.2 35.1 31.8 685.8 229
24 in. 36 2.75 27.25 24 1.62 1 ½ 32 790
mm 914.4 69.9 692.2 41.1 38.1 812.8 358