CLASS 150 PIPE FLANGES DIMENSIONS CHART

Flanges, bolt holes and bolting dimensions chart of class 150 pipe flanges per ASME B16.5. Dimensions are in millimeters.

Class 150 Flanges Dimensions

Note 1: The diameter at the intersection between the hub taper and the back face of the flange. This dimension may be straight or tapered (not exceed 7 deg).

Flange Dimensions (millimeters)
NPS O tf1 tf2 X A Y1 Y2 Y3 Tmin B1 B2 B3 r D
1/2 90 9.6 11.2 30 21.3 14 16 46 16 22.2 22.9 15.8 3 10
3/4 100 11.2 12.7 38 26.7 14 16 51 16 27.7 28.2 20.9 3 11
1 110 12.7 14.3 49 33.4 16 17 54 17 34.5 34.9 26.6 3 13
1 1/4 115 14.3 15.9 59 42.2 19 21 56 21 43.2 43.7 35.1 5 14
1 1/2 125 15.9 17.5 65 48.3 21 22 60 22 49.5 50.0 40.9 6 16
NPS O tf1 tf2 X A Y1 Y2 Y3 Tmin B1 B2 B3 r D
2 150 17.5 19.1 78 60.3 24 25 62 25 61.9 62.5 52.5 8 17
2 1/2 180 20.7 22.3 90 73.0 27 29 68 29 74.6 75.4 62.7 8 19
3 190 22.3 23.9 108 88.9 29 30 68 30 90.7 91.4 77.9 10 21
3 1/2 215 22.3 23.9 122 101.6 30 32 70 32 103.4 104.1 90.1 10 --
4 230 22.3 23.9 135 114.3 32 33 75 33 116.1 116.8 102.3 11 --
NPS O tf1 tf2 X A Y1 Y2 Y3 Tmin B1 B2 B3 r D
5 255 22.3 23.9 164 141.3 35 36 87 36 143.8 144.4 128.2 11 --
6 280 23.9 25.4 192 168.3 38 40 87 40 170.7 171.4 154.1 13 --
8 345 27.0 28.6 246 219.1 43 44 100 44 221.5 222.2 202.7 13 --
10 405 28.6 30.2 305 273.0 48 49 100 49 276.2 277.4 254.6 13 --
12 485 30.2 31.8 365 323.8 54 56 113 56 327.0 328.2 304.8 13 --
NPS O tf1 tf2 X A Y1 Y2 Y3 Tmin B1 B2 B3 r D
14 535 33.4 35.0 400 355.6 56 79 125 57 359.2 360.2 TBD 133 --
16 595 35.0 36.6 457 406.4 62 87 125 64 410.5 411.2 13 --
18 635 38.1 39.7 505 457.0 67 97 138 68 461.8 462.3 13 --
20 700 41.3 42.9 559 508.0 71 103 143 73 513.1 514.4 13 --
24 815 46.1 47.7 663 610.0 81 111 151 83 616.0 616.0 13 --

Notes:

NPS - Nominal Pipe Size, O - Outside Diameter of Flange, tf1 - Thickness of Flange, Min., tf2 - Thickness of Lap Joint, Min. , X - Hub Diameter, A - Hub Dia. Beginning of Chamfer Welding Neck, Y - Length Through Hub, T - Thread Length, Min. , B - Bore, r - Corner radius of Bore of Lapped Flange and Pipe, D - Depth of Socket

Class 150 Flanges Drilling Dimensions

Bolt Holes and Bolting Dimensions (inches)
NPS O Drilling L
W
 Dia. of
Bolt
Holes,
in		 No.
of
Bolts		 Dia.
of
Bolts,
in		 Stud
Bolts		 Machine
Bolts
2 mm
Raised
Face		 Ring
Joint		 2 mm
Raised
Face
1/2 90 60.3 5/8 4 1/2 55 -- 50
3/4 100 69.9 5/8 4 1/2 65 -- 50
1 110 79.4 5/8 4 1/2 65 75 55
1 1/4 115 88.9 5/8 4 1/2 70 85 55
1 1/2 125 98.4 5/8 4 1/2 70 85 65
NPS O Drilling L
W
 Dia. of
Bolt
Holes,
in		 No.
of
Bolts		 Dia.
of
Bolts,
in		 Stud
Bolts		 Machine
Bolts
2 mm
Raised
Face		 Ring
Joint		 2 mm
Raised
Face
2 150 120.7 3/4 4 5/8 85 95 70
2 1/2 180 139.7 3/4 4 5/8 90 100 75
3 190 152.4 3/4 4 5/8 90 100 75
3 1/2 215 177.8 3/4 8 5/8 90 100 75
4 230 190.5 3/4 8 5/8 90 100 75
NPS O Drilling L
W
 Dia. of
Bolt
Holes,
in		 No.
of
Bolts		 Dia.
of
Bolts,
in		 Stud
Bolts		 Machine
Bolts
2 mm
Raised
Face		 Ring
Joint		 2 mm
Raised
Face
5 255 215.9 7/8 8 3/4 95 110 85
6 280 241.3 7/8 8 3/4 100 115 85
8 345 298.5 7/8 8 3/4 110 120 90
10 405 362.0 1 12 7/8 115 125 100
12 485 431.8 1 12 7/8 120 135 100
NPS O Drilling L
W
 Dia. of
Bolt
Holes,
in		 No.
of
Bolts		 Dia.
of
Bolts,
in		 Stud
Bolts		 Machine
Bolts
2 mm
Raised
Face		 Ring
Joint		 2 mm
Raised
Face
14 535 476.3 1 1/8 12 1 135 145 115
16 595 539.8 1 1/8 16 1 135 145 115
18 635 577.9 1 1/4 16 1 1/8 145 160 125
20 700 635.0 1 1/4 20 1 1/8 160 170 140
24 815 749.3 1 3/8 20 1 1/4 170 185 150

Notes:

NPS - Nominal Pipe Size, O - Outside Diameter of Flange, W - Diameter of Bolt Circle, L - Length of Bolts

Dimensions are in millimeters, except for diameters of bolts and bolt holes, which are in inch units

Related Topics:

Reference:

  • ASME B16.5-2003, Pipe Flanges and Flanged Fittings (NPS 1/2 Through NPS 24 Metric/Inch Standard)