ANSI B16.5 FORGED FLANGES  Unit: mm
Class 1500 Normal Flanges
Nominal Pipe Size Outside Diam Diam of base of Hub 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
Bolt Circle Diam Number of  Holes  Diam of Holes Diam of Bolts (inch)  Stud Bolt Length Welding Neck Slip-on  and Threaded Lap Joint Blind Socket Welding
Welding Neck Socket Welding Slip-on Socket Welding Lap Joint Counter Bore Min.  Welding Neck  Slip-on Threaded Socket Welding Lap Joint 
0.25 Raised Face Male female tongue-Groove Ring Joint
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 121 38.1 35.1 22.4 See Note (1) To be Specified by purchaser. 22.4 22.9 23.6 60.5 31.8 31.8 21.3 3.0 22.4 9.7 82.6 4 22.4 ¾ 108.0 101.6 108.0 2.10 4.60 1.80 4.00 1.80 4.00 1.90 4.00 1.81 4.00 ½
¾  130 44.5 42.9 25.4 27.7 28.2 29.0 69.9 35.1 35.1 26.7 3.0 25.4 11.2 88.9 4 22.4 ¾ 114.3 108.0 114.3 2.72 6.00 2.27 5.00 2.27 5.00 2.72 6.00 2.81 6.20 ¾ 
1 149 52.3 50.8 28.4 34.5 35.1 35.8 73.2 41.1 41.1 33.5 3.0 28.4 12.7 101.6 4 25.4 7/8 127.0 120.7 127.0 3.86 8.50 3.40 7.50 3.40 7.50 4.08 9.00 3.61 8.00 1
1 ¼  159 63.5 63.5 28.4 43.2 43.7 44.5 73.2 41.1 41.1 42.2 4.8 30.2 14.2 111.3 4 25.4 7/8 127.0 120.7 127.0 4.54 10.00 4.10 9.00 4.09 10.80 4.30 9.50 4.99 11.00 1 ¼ 
1 ½  178 69.9 73.2 31.8 49.5 50.0 50.5 82.6 44.5 44.5 48.3 6.4 31.8 15.7 124.0 4 28.4 1 139.7 133.4 139.7 5.90 13.00 5.45 12.00 5.40 11.90 5.90 13.00 6.76 14.90 1 ½ 
2 216 104.6 91.9 38.1 62.0 62.5 63.5 101.6 57.2 57.2 60.5 7.9 38.1 17.5 165.1 8 25.4 7/8 146.1 139.7 146.1 10.89 24.00 10.50 23.00 9.53 21.00 11.30 25.00 10.89 24.00 2
2 ½  244 124.0 104.6 41.1 74.7 75.4 76.2 104.6 63.5 63.5 73.2 7.9 47.8 19.1 190.5 8 28.4 1 158.8 152.4 158.8 16.34 36.00 15.80 34.80 13.15 29.00 16.00 35.30 16.34 36.00 2 ½ 
3 267 133.4 127.0 47.8 90.7 91.4 92.2 117.3 73.2 73.2 88.9 9.7 50.8 20.6 203.2 8 31.8 1 1/8 177.8 171.5 177.8 21.79 48.00 21.77 48.00 17.24 38.00 21.79 48.00     3
4 311 162.1 157.2 53.8 116.1 116.8 117.6 124.0 90.4 90.4 114.3 11.2 57.2 23.9 241.3 8 35.1 1 ¼ 196.9 190.5 196.9 31.30 69.00 31.00 68.40 29.00 63.90 33.11 73.00     4
5 375 196.9 185.7 73.2 143.8 144.5 144.5 155.4 104.6 104.6 141.2 11.2 63.5 23.9 292.1 8 41.1 1 ½ 247.7 241.3 247.7 59.02 130.00 58.80 129.60 54.00 119.00 60.00 132.30     5
6 394 228.6 215.9 82.6 170.7 171.5 171.5 171.5 119.1 119.1 168.4 12.7 69.9 26.9 317.5 12 38.1 1 3/8 260.4 254.0 266.7 74.91 165.00 74.00 163.00 62.00 136.70 75.00 165.30     6
8 483 292.1 269.7 91.9 221.5 222.3 222.3 212.9 142.7 142.7 219.2 12.7 76.2 31.8 393.7 12 44.5 1 5/8 292.1 285.8 323.9 123.83 273.00 117.73 258.00 129.73 236.00 136.98 302.00     8
10 584 368.3 323.9 108.0 276.4 277.4 276.4 254.0 158.8 177.8 273.1 12.7 84.1 33.3 482.6 12 50.8 1 7/8 336.6 330.2 342.9 205.93 454.00 197.49 435.40 220.19 485.40 229.97 507.00     10
12 673 450.9 381.0 124.0 327.2 328.2 328.7 282.4 180.8 218.9 323.9 12.7 91.9 39.6 571.5 16 53.8 2 374.7 368.3 387.4 306.00 674.60 264.00 582.00 286.02 630.60 316.00 696.70     12
14 749 495.3 412.8 133.4 359.2 360.2 360.4 298.5 - 241.3 355.6 12.7 - 41.4 635.0 16 60.5 2 ¼ 406.4 400.1 425.5 416.00 917.00 - - 404.06 890.80 421.00 928.00     14
16 826 552.5 469.9 146.1 410.5 411.2 411.2 311.2 - 260.4 406.4 12.7 - 44.5 704.9 16 66.5 2 ½ 444.5 438.2 469.9 567.50 1250.00 - - 522.10 1151.00 559.00 1232.70     16
18 914 596.9 533.4 162.1 461.8 462.3 462.0 327.2 - 276.4 457.2 12.7 - 49.3 774.7 16 73.2 2 ¾ 495.3 489.0 527.1 736.00 1622.60 - - 669.65 1476.30 761.00 1677.70     18
20 984 641.4 584.2 177.8 513.1 514.4 512.8 355.6 - 292.1 508.0 12.7 - 54.1 831.9 16 79.2 3 539.8 533.4 565.2 929.00 2048.00 - - 805.85 1776.60 967.00 2131.80     20
24 1168 762.0 692.2 203.2 616.0 616.0 614.4 406.4 - 330.2 609.6 12.7 - 63.5 990.6 16 91.9 3 ½ 616.0 609.6 647.7 1504.00 3315.70 - - 1285.55 2834.00 1568.00 3456.80     24
Notes:
(1) For the inside diameter of pipes (corresponding to Bore (B1) of welding Neck Flanges), refer to page 56.
(2) Class 1500 flanges except lap Joint will be furnished with 0.25" (6.35mm) raised face, which is not included in Thickness (t)
 and length through Hub (T1), (T2)
(3) For Slip-on, Threaded and 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.
and facing is carried out according to MSS SP-9 without reducing thickness(t).
(6) Dimensions of size 1/2" through 2 1/2" are the same as for class 900 Flanges.
(7) Depth of socket (Y) is covered by ANSI B16.5 only in sizes through 2 1/2" inch. Over 2 1/2" inch is at the manufacturs option.