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ANSI / ASME · Class 2500 Family: ANSI / ASME flangesReference: Class 2500 (2500 lb)Standard: ASME B16.5
Dimensional drawing Welding Neck flange · WN Threaded flange Lap Joint flange 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 2500 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 THr 1/2 133.35 30.23 35.05 42.93 4 × Ø22.35 88.90 73.15 21.34 -- 39.62 22.35 3.30 39.62 22.86 28.70 3/4 139.70 31.75 42.93 50.80 4 × Ø22.35 95.25 79.50 26.67 -- 42.93 27.69 3.30 42.93 28.19 31.75 1 158.75 35.05 50.80 57.15 4 × Ø25.40 107.95 88.90 33.53 -- 47.75 34.54 3.30 47.75 35.05 35.05 1-1/4 184.15 38.10 63.50 73.15 4 × Ø28.70 130.30 95.25 42.16 -- 52.32 43.18 4.57 52.32 43.69 38.10 1-1/2 203.20 44.45 73.15 79.50 4 × Ø31.75 146.05 111.25 48.26 -- 60.45 49.53 6.35 60.45 50.04 44.45 2 234.95 50.80 92.20 95.25 8 × Ø28.70 171.45 127.00 60.45 -- 69.85 61.98 7.87 69.85 62.48 50.80 2-1/2 266.70 57.15 104.90 114.30 8 × Ø31.75 196.85 143.00 73.15 -- 79.50 74.68 7.87 79.50 75.44 57.15 3 304.80 66.80 127.00 133.35 8 × Ø35.05 228.60 168.40 88.90 -- 92.20 90.68 9.40 92.20 91.44 63.50 4 355.60 76.20 157.23 165.10 8 × Ø41.40 273.05 190.50 114.30 -- 107.95 116.08 11.18 107.95 116.84 69.85 5 419.10 92.20 185.67 203.20 8 × Ø47.75 323.85 228.60 141.22 -- 130.30 143.76 11.18 130.30 144.53 76.20 6 482.60 107.95 215.90 234.95 8 × Ø54.10 368.30 273.05 168.40 -- 152.40 170.69 12.70 152.40 171.45 82.55 8 552.45 127.00 270.00 304.80 12 × Ø54.10 438.15 317.50 219.20 -- 177.80 221.49 12.70 177.80 222.25 95.25 10 673.10 165.10 323.85 374.65 12 × Ø66.80 539.75 419.10 273.05 -- 228.60 276.35 12.70 228.60 277.37 107.95 12 762.00 184.15 381.00 441.45 12 × Ø73.15 619.25 463.55 323.85 -- 254.00 327.15 12.70 254.00 328.17 120.65
NPS 1/2 NPS 1/2
O 133.35
T 30.23
R 35.05
X 42.93
No. × hole Ø (mm) 4 × Ø22.35
Bolt circle Ø (mm) 88.90
L2 73.15
H 21.34
B2 --
L 39.62
B 22.35
r 3.30
L3 39.62
B3 22.86
THr 28.70
NPS 3/4 NPS 3/4
O 139.70
T 31.75
R 42.93
X 50.80
No. × hole Ø (mm) 4 × Ø22.35
Bolt circle Ø (mm) 95.25
L2 79.50
H 26.67
B2 --
L 42.93
B 27.69
r 3.30
L3 42.93
B3 28.19
THr 31.75
NPS 1 NPS 1
O 158.75
T 35.05
R 50.80
X 57.15
No. × hole Ø (mm) 4 × Ø25.40
Bolt circle Ø (mm) 107.95
L2 88.90
H 33.53
B2 --
L 47.75
B 34.54
r 3.30
L3 47.75
B3 35.05
THr 35.05
NPS 1-1/4 NPS 1-1/4
O 184.15
T 38.10
R 63.50
X 73.15
No. × hole Ø (mm) 4 × Ø28.70
Bolt circle Ø (mm) 130.30
L2 95.25
H 42.16
B2 --
L 52.32
B 43.18
r 4.57
L3 52.32
B3 43.69
THr 38.10
NPS 1-1/2 NPS 1-1/2
O 203.20
T 44.45
R 73.15
X 79.50
No. × hole Ø (mm) 4 × Ø31.75
Bolt circle Ø (mm) 146.05
L2 111.25
H 48.26
B2 --
L 60.45
B 49.53
r 6.35
L3 60.45
B3 50.04
THr 44.45
NPS 2 NPS 2
O 234.95
T 50.80
R 92.20
X 95.25
No. × hole Ø (mm) 8 × Ø28.70
Bolt circle Ø (mm) 171.45
L2 127.00
H 60.45
B2 --
L 69.85
B 61.98
r 7.87
L3 69.85
B3 62.48
THr 50.80
NPS 2-1/2 NPS 2-1/2
O 266.70
T 57.15
R 104.90
X 114.30
No. × hole Ø (mm) 8 × Ø31.75
Bolt circle Ø (mm) 196.85
L2 143.00
H 73.15
B2 --
L 79.50
B 74.68
r 7.87
L3 79.50
B3 75.44
THr 57.15
NPS 3 NPS 3
O 304.80
T 66.80
R 127.00
X 133.35
No. × hole Ø (mm) 8 × Ø35.05
Bolt circle Ø (mm) 228.60
L2 168.40
H 88.90
B2 --
L 92.20
B 90.68
r 9.40
L3 92.20
B3 91.44
THr 63.50
NPS 4 NPS 4
O 355.60
T 76.20
R 157.23
X 165.10
No. × hole Ø (mm) 8 × Ø41.40
Bolt circle Ø (mm) 273.05
L2 190.50
H 114.30
B2 --
L 107.95
B 116.08
r 11.18
L3 107.95
B3 116.84
THr 69.85
NPS 5 NPS 5
O 419.10
T 92.20
R 185.67
X 203.20
No. × hole Ø (mm) 8 × Ø47.75
Bolt circle Ø (mm) 323.85
L2 228.60
H 141.22
B2 --
L 130.30
B 143.76
r 11.18
L3 130.30
B3 144.53
THr 76.20
NPS 6 NPS 6
O 482.60
T 107.95
R 215.90
X 234.95
No. × hole Ø (mm) 8 × Ø54.10
Bolt circle Ø (mm) 368.30
L2 273.05
H 168.40
B2 --
L 152.40
B 170.69
r 12.70
L3 152.40
B3 171.45
THr 82.55
NPS 8 NPS 8
O 552.45
T 127.00
R 270.00
X 304.80
No. × hole Ø (mm) 12 × Ø54.10
Bolt circle Ø (mm) 438.15
L2 317.50
H 219.20
B2 --
L 177.80
B 221.49
r 12.70
L3 177.80
B3 222.25
THr 95.25
NPS 10 NPS 10
O 673.10
T 165.10
R 323.85
X 374.65
No. × hole Ø (mm) 12 × Ø66.80
Bolt circle Ø (mm) 539.75
L2 419.10
H 273.05
B2 --
L 228.60
B 276.35
r 12.70
L3 228.60
B3 277.37
THr 107.95
NPS 12 NPS 12
O 762.00
T 184.15
R 381.00
X 441.45
No. × hole Ø (mm) 12 × Ø73.15
Bolt circle Ø (mm) 619.25
L2 463.55
H 323.85
B2 --
L 254.00
B 327.15
r 12.70
L3 254.00
B3 328.17
THr 120.65
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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