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ANSI / ASME · Class 400 Family: ANSI / ASME flangesReference: Class 400 (400 lb)Standard: ASME B16.5
Dimensional drawing Welding Neck flange · WN Threaded flange Slip-On flange · SO Lap Joint flange Socket Weld flange · SW Blind flange Enlargeable sectional drawings. Dimensional tables are in mm; NPS retains its nominal designation. RF height shown in the drawings: 1/4″ = 6.35 mm.
Dimensions · Class 400 All dimensions in mm. NPS: nominal designation.
NPS O T R X No. × hole Ø (mm) Bolt circle Ø (mm) L2 H B2 L B r L3 B3 D C THr 1/2 95.25 14.22 35.05 38.10 4 × Ø15.75 66.55 52.32 21.34 -- 22.35 22.35 3.05 22.35 22.86 9.65 23.62 15.75 3/4 117.35 15.75 42.93 47.75 4 × Ø19.05 82.55 57.15 26.67 -- 25.40 27.69 3.05 25.40 28.19 11.18 28.96 15.75 1 123.95 17.53 50.80 53.85 4-.075 88.90 61.98 33.53 -- 26.92 34.54 3.05 26.92 35.05 12.70 35.81 17.53 1-1/4 133.35 20.57 63.50 63.50 4 × Ø19.05 98.55 66.55 42.16 -- 28.45 43.18 4.83 28.45 43.69 14.22 44.45 20.57 1-1/2 155.45 22.35 73.15 69.85 4 × Ø22.35 114.30 69.85 48.26 -- 31.75 49.53 6.35 31.75 50.04 15.75 50.55 22.35 2 165.10 25.40 91.95 84.07 8 × Ø19.05 127.00 73.15 60.45 -- 36.58 61.98 7.87 36.58 62.48 17.53 63.50 28.45 2-1/2 190.50 28.45 104.65 100.08 8 × Ø22.35 149.35 79.25 73.15 -- 41.15 74.68 7.87 41.15 75.44 19.05 76.20 31.75 3 209.55 31.75 127.00 117.35 8 × Ø22.35 168.15 82.55 88.90 -- 45.97 90.68 9.65 45.97 91.44 20.57 92.20 35.05 3-1/2 228.60 35.05 139.70 133.35 8 × Ø25.40 184.15 85.85 101.60 -- 49.28 103.38 9.65 49.28 104.14 104.90 39.62 4 254.00 35.05 157.23 146.05 8 × Ø25.40 200.15 88.90 114.30 -- 50.80 116.08 11.18 50.80 116.84 117.60 36.58 5 279.40 38.10 185.67 177.80 8 × Ø25.40 234.95 101.60 141.22 -- 53.85 143.76 11.18 53.85 144.53 144.53 42.93 6 317.50 41.15 215.90 206.25 12 × Ø25.40 269.75 103.12 168.40 -- 57.15 170.69 12.70 57.15 171.45 171.45 45.97 8 381.00 47.75 269.75 260.35 12 × Ø28.45 330.20 117.35 219.20 -- 68.33 221.49 12.70 68.33 222.25 222.25 50.80 10 444.50 53.85 323.85 320.55 16 × Ø31.75 387.35 123.95 273.05 -- 73.15 276.35 12.70 101.60 277.37 276.35 55.63 12 520.70 57.15 381.00 374.65 16 × Ø35.05 450.85 136.65 323.85 -- 79.25 327.15 12.70 107.95 328.17 328.68 60.45 14 584.20 60.45 412.75 425.45 20 × Ø35.05 514.35 149.35 355.60 -- 84.07 359.16 12.70 117.35 360.17 360.43 63.50 16 647.70 63.50 469.90 482.60 20 × Ø38.10 571.50 152.40 406.40 -- 93.73 410.46 12.70 127.00 411.23 411.23 68.33 18 711.20 66.55 533.40 533.40 24 × Ø38.10 628.65 165.10 457.20 -- 98.55 461.77 12.70 136.65 462.28 462.03 69.85 20 774.70 69.85 584.20 587.25 24 × Ø41.15 685.80 168.15 508.00 -- 101.60 513.08 12.70 146.05 514.35 512.83 73.15 22 838.20 73.15 641.35 641.35 24 × Ø44.45 742.95 171.45 558.80 -- 107.95 564.39 12.70 152.40 565.15 -- -- 24 914.40 76.20 692.15 701.55 24 × Ø47.75 812.80 174.75 609.60 -- 114.30 615.95 12.70 158.75 615.95 614.43 82.55
NPS 1/2 NPS 1/2
O 95.25
T 14.22
R 35.05
X 38.10
No. × hole Ø (mm) 4 × Ø15.75
Bolt circle Ø (mm) 66.55
L2 52.32
H 21.34
B2 --
L 22.35
B 22.35
r 3.05
L3 22.35
B3 22.86
D 9.65
C 23.62
THr 15.75
NPS 3/4 NPS 3/4
O 117.35
T 15.75
R 42.93
X 47.75
No. × hole Ø (mm) 4 × Ø19.05
Bolt circle Ø (mm) 82.55
L2 57.15
H 26.67
B2 --
L 25.40
B 27.69
r 3.05
L3 25.40
B3 28.19
D 11.18
C 28.96
THr 15.75
NPS 1 NPS 1
O 123.95
T 17.53
R 50.80
X 53.85
No. × hole Ø (mm) 4-.075
Bolt circle Ø (mm) 88.90
L2 61.98
H 33.53
B2 --
L 26.92
B 34.54
r 3.05
L3 26.92
B3 35.05
D 12.70
C 35.81
THr 17.53
NPS 1-1/4 NPS 1-1/4
O 133.35
T 20.57
R 63.50
X 63.50
No. × hole Ø (mm) 4 × Ø19.05
Bolt circle Ø (mm) 98.55
L2 66.55
H 42.16
B2 --
L 28.45
B 43.18
r 4.83
L3 28.45
B3 43.69
D 14.22
C 44.45
THr 20.57
NPS 1-1/2 NPS 1-1/2
O 155.45
T 22.35
R 73.15
X 69.85
No. × hole Ø (mm) 4 × Ø22.35
Bolt circle Ø (mm) 114.30
L2 69.85
H 48.26
B2 --
L 31.75
B 49.53
r 6.35
L3 31.75
B3 50.04
D 15.75
C 50.55
THr 22.35
NPS 2 NPS 2
O 165.10
T 25.40
R 91.95
X 84.07
No. × hole Ø (mm) 8 × Ø19.05
Bolt circle Ø (mm) 127.00
L2 73.15
H 60.45
B2 --
L 36.58
B 61.98
r 7.87
L3 36.58
B3 62.48
D 17.53
C 63.50
THr 28.45
NPS 2-1/2 NPS 2-1/2
O 190.50
T 28.45
R 104.65
X 100.08
No. × hole Ø (mm) 8 × Ø22.35
Bolt circle Ø (mm) 149.35
L2 79.25
H 73.15
B2 --
L 41.15
B 74.68
r 7.87
L3 41.15
B3 75.44
D 19.05
C 76.20
THr 31.75
NPS 3 NPS 3
O 209.55
T 31.75
R 127.00
X 117.35
No. × hole Ø (mm) 8 × Ø22.35
Bolt circle Ø (mm) 168.15
L2 82.55
H 88.90
B2 --
L 45.97
B 90.68
r 9.65
L3 45.97
B3 91.44
D 20.57
C 92.20
THr 35.05
NPS 3-1/2 NPS 3-1/2
O 228.60
T 35.05
R 139.70
X 133.35
No. × hole Ø (mm) 8 × Ø25.40
Bolt circle Ø (mm) 184.15
L2 85.85
H 101.60
B2 --
L 49.28
B 103.38
r 9.65
L3 49.28
B3 104.14
D —
C 104.90
THr 39.62
NPS 4 NPS 4
O 254.00
T 35.05
R 157.23
X 146.05
No. × hole Ø (mm) 8 × Ø25.40
Bolt circle Ø (mm) 200.15
L2 88.90
H 114.30
B2 --
L 50.80
B 116.08
r 11.18
L3 50.80
B3 116.84
D —
C 117.60
THr 36.58
NPS 5 NPS 5
O 279.40
T 38.10
R 185.67
X 177.80
No. × hole Ø (mm) 8 × Ø25.40
Bolt circle Ø (mm) 234.95
L2 101.60
H 141.22
B2 --
L 53.85
B 143.76
r 11.18
L3 53.85
B3 144.53
D —
C 144.53
THr 42.93
NPS 6 NPS 6
O 317.50
T 41.15
R 215.90
X 206.25
No. × hole Ø (mm) 12 × Ø25.40
Bolt circle Ø (mm) 269.75
L2 103.12
H 168.40
B2 --
L 57.15
B 170.69
r 12.70
L3 57.15
B3 171.45
D —
C 171.45
THr 45.97
NPS 8 NPS 8
O 381.00
T 47.75
R 269.75
X 260.35
No. × hole Ø (mm) 12 × Ø28.45
Bolt circle Ø (mm) 330.20
L2 117.35
H 219.20
B2 --
L 68.33
B 221.49
r 12.70
L3 68.33
B3 222.25
D —
C 222.25
THr 50.80
NPS 10 NPS 10
O 444.50
T 53.85
R 323.85
X 320.55
No. × hole Ø (mm) 16 × Ø31.75
Bolt circle Ø (mm) 387.35
L2 123.95
H 273.05
B2 --
L 73.15
B 276.35
r 12.70
L3 101.60
B3 277.37
D —
C 276.35
THr 55.63
NPS 12 NPS 12
O 520.70
T 57.15
R 381.00
X 374.65
No. × hole Ø (mm) 16 × Ø35.05
Bolt circle Ø (mm) 450.85
L2 136.65
H 323.85
B2 --
L 79.25
B 327.15
r 12.70
L3 107.95
B3 328.17
D —
C 328.68
THr 60.45
NPS 14 NPS 14
O 584.20
T 60.45
R 412.75
X 425.45
No. × hole Ø (mm) 20 × Ø35.05
Bolt circle Ø (mm) 514.35
L2 149.35
H 355.60
B2 --
L 84.07
B 359.16
r 12.70
L3 117.35
B3 360.17
D —
C 360.43
THr 63.50
NPS 16 NPS 16
O 647.70
T 63.50
R 469.90
X 482.60
No. × hole Ø (mm) 20 × Ø38.10
Bolt circle Ø (mm) 571.50
L2 152.40
H 406.40
B2 --
L 93.73
B 410.46
r 12.70
L3 127.00
B3 411.23
D —
C 411.23
THr 68.33
NPS 18 NPS 18
O 711.20
T 66.55
R 533.40
X 533.40
No. × hole Ø (mm) 24 × Ø38.10
Bolt circle Ø (mm) 628.65
L2 165.10
H 457.20
B2 --
L 98.55
B 461.77
r 12.70
L3 136.65
B3 462.28
D —
C 462.03
THr 69.85
NPS 20 NPS 20
O 774.70
T 69.85
R 584.20
X 587.25
No. × hole Ø (mm) 24 × Ø41.15
Bolt circle Ø (mm) 685.80
L2 168.15
H 508.00
B2 --
L 101.60
B 513.08
r 12.70
L3 146.05
B3 514.35
D —
C 512.83
THr 73.15
NPS 22 NPS 22
O 838.20
T 73.15
R 641.35
X 641.35
No. × hole Ø (mm) 24 × Ø44.45
Bolt circle Ø (mm) 742.95
L2 171.45
H 558.80
B2 --
L 107.95
B 564.39
r 12.70
L3 152.40
B3 565.15
D —
C --
THr --
NPS 24 NPS 24
O 914.40
T 76.20
R 692.15
X 701.55
No. × hole Ø (mm) 24 × Ø47.75
Bolt circle Ø (mm) 812.80
L2 174.75
H 609.60
B2 --
L 114.30
B 615.95
r 12.70
L3 158.75
B3 615.95
D —
C 614.43
THr 82.55
Catalogue dimensions converted using 1 inch = 25.4 mm, rounded to two decimal places. NPS retains its nominal inch designation. Dimension letters correspond to the drawing. Unspecified values remain blank.
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