ANSI B16.5 FORGED FLANGES  Unit: mm
Class 600 Normal Flanges
Nominal Pipe Size Outside Diam   O.D. of Raised face Thick-ness  BORE LENGTH THRU HUB Diam of Hub of Bevel Radius of Filler Thread Length Depth of Socket Drilling Bolting Approximate Weight Nominal Pipe Size
Diam  Bolt Circle Diam Number of Holes Diam of Holes Diam of Bolts (inch)  Stud Bolt Length Welding Neck   Lap Joint Blind Socket Welding
of Base of Hub Welding Neck Socket Welding Slip-on Socket Welding Lap Joint Counter Bore Mn.  Welding Neck  Slip-on Threaded Socket Welding Lap Joint Slip-on 
  0.25 Raised Face Male female tongue-Groove Ring Joint and Threaded
D X G t B1 B2 B3 B T1 T2 T3 A R Q Y Kg Ib Kg Ib Kg Ib Kg Ib Kg Ib
½ 95 38.1 35.1 14.2 See Note (1) To be Specified by purchase.



















 22.4 22.9 23.6 52.3 22.4 22.4 21.3 3.0 15.7 9.7 66.5 4 15.7 ½ 76.2 69.9 76.2 0.90 2.00 0.91 2.00 0.80 1.80 0.91 2.00 0.91 2.00 ½
¾  117 47.8 42.9 15.7 27.7 28.2 29.0 57.2 25.4 25.4 26.7 3.0 15.7 11.2 82.6 4 19.1 5/8 88.9 82.6 88.9 1.59 3.50 1.40 3.00 1.36 3.00 1.40 3.00 1.36 3.00 ¾ 
1 124 53.8 50.8 17.5 34.5 35.1 35.8 62.0 26.9 26.9 33.5 3.0 17.5 12.7 88.9 4 19.1 5/8 88.9 82.6 88.9 1.90 4.00 1.70 3.70 1.59 3.50 1.81 4.00 1.81 4.00 1
1 ¼  133 63.5 63.5 20.6 43.2 43.7 44.5 66.5 28.4 28.4 42.2 4.8 20.6 14.2 98.6 4 19.1 5/8 95.3 88.9 95.3 2.49 5.50 2.27 5.00 2.04 4.50 2.40 5.30 2.60 5.70 1 ¼ 
1 ½  155 69.9 73.2 22.4 49.5 50.0 50.5 69.9 31.8 31.8 48.3 6.4 22.4 15.7 114.3 4 22.4 ¾ 108.0 101.6 108.0 3.63 8.00 3.10 6.80 2.95 6.50 3.40 7.50 3.18 7.00 1 ½ 
2 165 84.1 91.9 25.4 62.0 62.5 63.5 73.2 36.6 36.6 60.5 7.9 28.4 17.5 127.0 8 19.1 5/8 108.0 101.6 108.0 4.54 10.00 3.63 8.00 3.63 8.00 4.40 9.70 3.90 8.60 2
2 ½  191 100.1 104.6 28.4 74.7 75.4 76.2 79.2 41.1 41.1 73.2 7.9 31.8 19.1 149.4 8 22.4 ¾ 120.7 114.3 120.7 6.35 14.00 5.44 12.00 4.99 11.00 6.80 15.00 5.90 13.00 2 ½ 
3 210 117.3 127.0 31.8 90.7 91.4 92.2 82.6 46.0 46.0 88.9 9.7 35.1 20.6 168.1 8 22.4 ¾ 127.0 120.7 127.0 8.16 18.00 7.26 16.00 6.35 14.00 8.90 19.60 7.40 16.30 3
3 ½  229 133.4 139.7 35.1 103.4 104.1 104.9 85.9 49.3 49.3 101.6 9.7 39.6 22.4 184.2 8 25.4 7/8 139.7 133.4 139.7 11.80 26.00 9.53 21.00 9.08 20.00 13.17 29.00     3 ½ 
4 273 152.4 157.2 38.1 116.1 116.8 117.6 101.6 53.8 53.8 114.3 11.2 41.1 23.9 215.9 8 25.4 7/8 146.1 139.7 146.1 16.78 37.00 14.97 33.00 14.06 31.00 18.60 41.00     4
5 330 189.0 185.7 44.5 143.8 144.5 144.5 114.3 60.5 60.5 141.2 11.2 47.8 23.9 266.7 8 28.4 1 165.1 158.8 165.1 30.87 68.00 28.50 62.80 27.50 60.60 30.84 68.00     5
6 356 222.3 215.9 47.8 170.7 171.5 171.5 117.3 66.5 66.5 168.4 12.7 50.8 26.9 292.1 12 28.4 1 171.5 165.1 171.5 36.77 80.00 36.32 80.00 35.38 78.00 38.00 83.80     6
8 419 273.1 269.7 55.6 221.5 222.3 222.3 133.4 76.2 76.2 219.2 12.7 57.2 31.8 349.3 12 31.8 1 1/8 190.5 184.2 190.5 50.80 112.00 44.00 97.00 50.80 112.00 62.20 137.00     8
10 508 342.9 323.9 63.5 276.4 277.4 276.4 152.4 85.9 111.3 273.1 12.7 65.0 33.3 431.8 16 35.1 1 ¼ 215.9 209.6 215.9 86.26 190.00 76.20 168.00 74.00 163.00 102.00 224.90     10
12 559 400.1 381.0 66.5 327.2 328.2 328.7 155.4 91.9 117.3 323.9 12.7 69.9 39.6 489.0 20 35.1 1 ¼ 222.3 215.9 222.3 102.51 226.00 97.52 215.00 108.86 240.00 132.00 291.00     12
14 603 431.8 412.8 69.9 359.2 360.2 360.4 165.1 93.7 127.0 355.6 12.7 73.2 41.4 527.1 20 38.1 1 3/8 235.0 228.6 235.0 121.56 268.00 102.00 224.80 111.00 244.70 158.00 348.30     14
16 686 495.3 469.9 76.2 410.5 411.2 411.2 177.8 106.4 139.7 406.4 12.7 77.7 44.5 603.3 20 41.1 1 ½  254.0 247.7 254.0 177.06 290.00 149.82 330.20 165.71 365.30 224.73 495.40     16
18 743 546.1 533.4 82.6 461.8 462.3 462.0 184.2 117.3 152.4 457.2 12.7 79.2 49.3 654.1 20 44.5 1 5/8 273.1 266.7 273.1 215.65 475.40 180.10 412.30 194.00 427.70 285.00 628.30     18
20 813 609.6 584.2 88.9 513.1 514.4 512.8 190.5 127.0 165.1 508.0 12.7 82.6 54.1 723.9 24 44.5 1 5/8 285.8 279.4 292.1 267.86 590.50 231.54 510.50 258.78 570.50 365.00 804.70     20
24 940 717.6 692.2 101.6 616.0 616.0 614.4 203.2 139.7 184.2 609.6 12.7 91.9 63.5 838.2 24 50.8 1 7/8 330.2 323.9 336.6 372.00 820.00 330.00 725.50 362.00 798.00 533.45 1176.00     24
Notes:
(1) For the inside diameter of pipes (corresponding to Bore (B1) of welding Neck Flanges), refer to page 56.
(2) Class 600 flanges except lap Joint will be furnished with 0.25" (0.35mm) raised face, which is not included in Thickness (t)
 and length through Hub (T1), (T2)
(3) For Slip-on, Threaded, lap joint and socket Welding Flanges, the hubs can be shaped either vertical from base to top or rapered within the limits of 7 degrees.
(4) Blind Flanges may be made with the same hub as that used for slip-on Flanges or without hub.
(5) The gasket surface and backside (bearing surface for bolting) are made parallel within 1 degree, to accomplish parallelism.
spot facing is carried out according to MSS SP-9 without reducing thickness(t).
(6) Dimensions of size 1/2" through 3 1/2" are the same as for class 400 Flanges.
(7) Depth of socket (Y) is covered by ANSI B16.5 only in sizes through 3 inch. Over 3 inch is at the manufacturs option.