ANSI/ASME B16.5 class 900 threaded flange

ANSI/ASME B16.5 standard covers pressure,temperature,ratings,materials,dimensions,tolerances,marking, testing,and methods of designating openings for pipe flanges and flanged fittings.Threaded flange dimensions are covered in ANSI/ASME B16.5 class 900 for size NPS ½” to 24″.Threaded flange means the inner bore of a flange is thread,the shape of the threaded flange is like a slip on flange,so the threaded flange could be plate shape or with a hub for longer thread.

Dimensions of ANSI/ASME B16.5 class 900 threaded flange:

ANSI ASME B16.5 class 900 threaded flange dimensions

ANSI ASME B16.5 class 900 threaded flange dimensions

Pipe Flange Data Hub Raised Face Drilling Data Weight
Nominal Pipe Size

 

A B C D E F G H I J
Outside Diameter Diameter Overall Counter-bore min Flange Thickness min Overall Length Threaded length min Hub Diameter Face Diameter Number of Holes Bolt Hole Diameter Diameter of Circle of Holes kg/piece
in
mm
in
mm
in
mm
in
mm
in
mm
in
mm
in
mm
in
mm
in
mm
in
½ 0.840 21.30 4.750 120.6 0.930 23.60 0.880 22.30 1.250 31.70 0.880 22.30 1.500 38.10 1.380 35.10 4 0.880 22.30 3.250 82.50 1.74
¾ 1.050 26.70 5.120 130.0 1.140 29.00 1.000 25.40 1.380 35.00 1.000 25.40 1.750 44.40 1.690 42.90 4 0.880 22.30 3.500 88.90 2.34
1 1.315 33.40 5.880 149.3 1.410 35.80 1.120 28.40 1.620 41.10 1.120 28.40 2.060 52.30 2.000 50.80 4 1.000 25.40 4.000 101.6 3.44
1.660 42.20 6.250 158.7 1.750 44.40 1.120 28.40 1.620 41.10 1.190 30.20 2.500 63.50 2.500 63.50 4 1.000 25.40 4.380 111.2 3.91
1.900 48.30 7.000 177.8 1.990 50.50 1.250 31.70 1.750 44.50 1.250 31.70 2.750 69.85 2.880 73.15 4 1.120 28.40 4.880 123.9 5.36
2 2.375 60.30 8.500 215.9 2.500 63.50 1.500 38.10 2.250 57.15 1.500 38.10 4.120 104.6 3.620 91.90 8 1.000 25.40 6.500 165.1 9.85
2.875 73.00 9.620 244.3 3.000 76.20 1.620 41.10 2.500 63.50 1.880 47.70 4.880 123.9 4.120 104.6 8 1.120 28.40 7.500 190.5 13.7
3 3.500 88.90 9.500 241.3 3.630 92.20 1.500 38.10 2.120 53.80 1.620 41.10 5.000 127.0 5.000 127.0 8 1.000 25.40 7.500 190.5 11.6
4 4.500 114.3 11.50 292.1 4.630 117.6 1.750 44.40 2.750 69.85 1.880 47.80 6.250 158.7 6.190 157.2 8 1.250 31.70 9.250 234.9 19.7
5 5.563 141.3 13.75 349.2 5.690 144.5 2.000 50.80 3.120 79.25 2.120 53.80 7.500 190.5 7.310 185.7 8 1.380 35.00 11.00 279.4 31.9
6 6.625 168.3 15.00 381.0 6.750 171.4 2.190 55.60 3.380 85.80 2.250 57.15 9.250 234.9 8.500 215.9 12 1.250 31.70 12.50 317.5 41.1
8 8.625 219.1 18.50 469.9 8.750 222.2 2.500 63.50 4.000 101.6 2.500 63.50 11.75 298.4 10.62 269.7 12 1.500 38.10 15.50 393.7 70.7
10 10.75 273.0 21.50 546.1 10.88 276.3 2.750 69.85 4.250 107.9 2.810 71.40 14.50 368.3 12.75 323.9 16 1.500 38.10 18.50 469.9 101
12 12.75 323.8 24.00 609.6 12.94 328.7 3.120 79.40 4.620 117.3 3.000 76.20 16.50 419.1 15.00 381.0 20 1.500 38.10 21.00 533.4 133
14 14.00 355.6 25.25 641.3 14.19 360.4 3.380 85.70 5.120 130.0 3.250 82.50 17.75 450.8 16.25 412.7 20 1.620 41.10 22.00 558.8 153
16 16.00 406.4 27.75 704.8 16.19 411.2 3.500 88.90 5.250 133.3 3.380 85.90 20.00 508.0 18.50 469.9 20 1.750 44.40 24.25 618.9 185
18 18.00 457.2 31.00 787.4 18.19 462.0 4.000 101.6 6.000 152.4 3.500 88.90 22.25 565.1 21.00 533.4 20 2.000 50.80 27.00 685.8 258
20 20.00 508.0 33.75 857.2 20.19 512.8 4.250 107.9 6.250 158.7 3.620 91.90 24.50 622.3 23.00 584.2 20 2.120 53.80 29.50 749.3 317
24 24.00 609.6 41.00 1041.4 24.19 614.4 5.500 139.7 8.000 203.2 4.000 101.6 29.50 749.3 27.25 692.2 20 2.620 66.55 35.50 901.7 606

Notes:

  • The thread conforms to ASME B1.20.1 NTP threads as described in Section 10.(The only exceptions are small male and female plain face threaded flanges which use NPSL locknut threads.)
  • Class 300 and higher threaded flanges are counter-bored.Threads are chamfered to the counterbore at an angle of 45° (approx).
  • Weights are based on manufacturer’s data and are approximate.

Specifications of ANSI/ASME B16.5 flange:

Types of ANSI/ASME B16.5 forged flanges:

ANSI ASME B16.5 weld neck flange drawing

ANSI ASME B16.5 weld neck flange drawing

Weld neck flange(WN flange) is circumferentially welded into the system at its neck which means that the integrity of the butt
welded area can be easily examined by radiography.The bores of both pipe and flange match,which reduces turbulence and erosion inside the pipeline.The weld neck is therefore favoured in critical applications.

ANSI ASME B16.5 blind flange drawing

ANSI ASME B16.5 blind flange drawing

Blind flange is used to blank off pipelines,valves and pumps,it can also be used as an inspection cover.It is sometimes referred to as a blank flange.

ANSI ASME B16.5 slip on flange drawing

ANSI ASME B16.5 slip on flange drawing

Slip on flange(SO flange) is slipped over the pipe and then fillet welded.Slip-on flanges are easy to use in fabricated applications.

ANSI ASME B16.5 lap joint flange drawing

ANSI ASME B16.5 lap joint flange drawing

Lap joint flange(LJ flange) is always used with either a stub end
or taft which is butt welded to the pipe with the flange loose behind it.
This means the stub end or taft always makes the face.The lap joint is favoured in low pressure applications because it is easily assembled and aligned.To reduce cost these flanges can be supplied without a hub and/or in treated,coated carbon steel.

ANSI ASME B16.5 socket weld flange drawing

ANSI ASME B16.5 socket weld flange drawing

Socket weld flange(SW flange) is counter bored to accept the pipe before being fillet welded.The bore of the pipe and flange are both the same therefore giving good flow characteristics.

ANSI ASME B16.5 threaded flange drawing

ANSI ASME B16.5 threaded flange drawing

Threaded flange is referred to as either threaded or screwed.It is used to connect other threaded components in low pressure,non-critical applications.No welding is required.

ANSI ASME B16.5 ring type joint flange drawing

ANSI ASME B16.5 ring type joint flange drawing

Ring type joint is a method of ensuring leak proof flange connection at high pressures.A metal ring is compressed into a hexagonal groove on the face of the flange to make the seal.This jointing method can be employed on weld neck flanges,slip on flange and blind flanges.

Materials of ANSI/ASME B16.5 class 900 threaded flange:

Carbon steel ANSI/ASME B16.5 threaded flange:

ASTM A105,A350 LF2,SS400,P235GH,P250GH,C22.8,Q235,20#,16Mn,etc.

Stainless steel ANSI/ASME B16.5 threaded flange:

ASTM A182 F304,F304L,F316,F316L,F321,F347,F310,F44,F51,etc.

Alloy steel ANSI/ASME B16.5 threaded flange:

ASTM A694 F42,F46,F52,F56,F60,F65,F70,A182 F5,F9,F91,F12,F11,F22,etc.

Related:

Haihao Group is one of the the biggest flanges manufacturer & supplier & exporter in China,we has strong experience in flange production and inspection and a complete set of equipments,including advanced cutting,forging,machining,drilling machines and professional testing & inspection instruments.If you want to know more about our forged flanges,please email us:sales@haihaogroup.com

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