The ASME B16.5 blind flange dimensions chart, NPS 1/2 – 24″, Class 150# – 2500#. Blind flange dimensions apply to any material grade, as carbon, alloy, stainless steel.

 

BLIND FLANGE DIMENSIONS CLASS 150 ASME B16.5

Blind Flange Dimension ASME B16.5

FLANGE
NPS
Outside
Diameter
Bolt Circle (BC) Raised Face (R) Raised Face (RF) Raised Face
Thickness (T)
Flat Face
Thickness (T2)
Bolt Hole (B) No. of
Bolt Holes
1/2″ 3.50″ 2.38″ 1.38″ .063″ .44″ .38″ .62″ 4
3/4″ 3.88″ 2.75″ 1.69″ .063″ .50″ .44″ .62″ 4
1″ 4.25″ 3.12″ 2.00″ .063″ .56″ .50″ .62″ 4
1-1/4″ 4.62″ 3.50″ 2.50″ .063″ .62″ .56″ .62″ 4
1-1/2″ 5.00″ 3.88″ 2.88″ .063″ .68″ .62″ .62″ 4
2″ 6.00″ 4.75″ 3.62″ .063″ .75″ .69″ .75″ 4
2-1/2″ 7.00″ 5.50″ 4.12″ .063″ .88″ .82″ .75″ 4
3″ 7.50″ 6.00″ 5.00″ .063″ .94″ .88″ .75″ 4
3-1/2″ 8.50″ 7.00″ 5.50″ .063″ .94″ .88″ .75″ 8
4″ 9.00″ 7.50″ 6.19″ .063″ .94″ .88″ .75″ 8
5″ 10.00″ 8.50″ 7.31″ .063″ .94″ .88″ .88″ 8
6″ 11.00″ 9.50″ 8.50″ .063″ 1.00″ .94″ .88″ 8
8″ 13.50″ 11.75″ 10.62″ .063″ 1.12″ 1.06″ .88″ 8
10″ 16.00″ 14.25″ 12.75″ .063″ 1.19″ 1.13″ 1.00″ 12
12″ 19.00″ 17.00″ 15.00″ .063″ 1.25″ 1.19″ 1.00″ 12
14″ 21.00″ 18.75″ 16.25″ .063″ 1.38″ 1.32″ 1.12″ 12
16″ 23.50″ 21.25″ 18.50″ .063″ 1.44″ 1.38″ 1.12″ 16
18″ 25.00″ 22.75″ 21.00″ .063″ 1.56″ 1.50″ 1.25″ 16
20″ 27.50″ 25.00″ 23.00″ .063″ 1.69″ 1.63″ 1.25″ 20
22″ 29.50″ 27.25″ 25.25″ .063″ 1.81″ 1.75″ 1.38″ 20
24″ 32.00″ 29.50″ 27.25″ .063″ 1.88″ 1.82″ 1.38″ 20

 

BLIND FLANGE DIMENSIONS CLASS 300 ASME B16.5

Blind Flange Dimension ASME B16.5

FLANGE
NPS
Outside
Diameter
Bolt Circle (BC) Raised Face (R) Raised Face (RF) Raised Face
Thickness (T)
Flat Face
Thickness (T2)
Bolt Hole (B) No. of
Bolt Holes
1/2″ 3.75″ 2.62″ 1.38″ .063″ 0.56″ 0.50″ 0.62″ 4
3/4″ 4.62″ 3.25″ 1.69″ .063″ 0.62″ .056″ 0.75″ 4
1″ 4.88″ 3.50″ 2.00″ .063″ 0.69″ 0.63″ 0.75″ 4
1-1/4″ 5.25″ 3.88″ 2.50″ .063″ 0.75″ 0.69″ 0.75″ 4
1-1/2″ 6.12″ 4.50″ 2.88″ .063″ 0.81″ 0.75″ 0.88″ 4
2″ 6.50″ 5.00″ 3.62″ .063″ 0.88″ 0.82″ 0.75″ 8
2-1/2″ 7.50″ 5.88″ 4.12″ .063″ 1.00″ 0.94″ 0.88″ 8
3″ 8.25″ 6.62″ 5.00″ .063″ 1.12″ 1.06″ 0.88″ 8
3-1/2″ 9.00″ 7.25″ 5.50″ .063″ 1.19″ 1.13″ 0.88″ 8
4″ 10.00″ 7.88″ 6.19″ .063″ 1.25″ 1.19″ 0.88″ 8
5″ 11.00″ 9.25″ 7.31″ .063″ 1.38″ 1.32″ 0.88″ 8
6″ 12.50″ 10.62″ 8.50″ .063″ 1.44″ 1.38″ 0.88″ 12
8″ 15.00″ 13.00″ 10.62″ .063″ 1.62″ 1.56″ 1.00″ 12
10″ 17.50″ 15.25″ 12.75″ .063″ 1.88″ 1.82″ 1.12″ 16
12″ 20.50″ 17.75″ 15.00″ .063″ 2.00″ 1.94″ 1.25″ 16
14″ 23.00″ 20.25″ 16.25″ .063″ 2.12″ 2.06″ 1.25″ 20
16″ 25.50″ 22.50″ 18.50″ .063″ 2.25″ 2.19″ 1.38″ 20
18″ 28.00″ 24.75″ 21.00″ .063″ 2.38″ 2.32″ 1.38″ 24
20″ 30.50″ 27.00″ 23.00″ .063″ 2.50″ 2.44″ 1.38″ 24
22″ 33.00″ 29.25″ 25.25″ .063″ 2.63″ 2.57″ 1.63″ 24
24″ 36.00″ 32.00″ 27.25″ .063″ 2.75″ 2.69″ 1.62″ 24

 

BLIND FLANGE DIMENSIONS CLASS 400 ASME B16.5

Blind Flange Dimension ASME B16.5

FLANGE
NPS
Outside
Diameter
Bolt Circle (BC) Raised Face (R) Raised Face (RF) Raised Face
Thickness (T)
Flat Face
Thickness (T2)
Bolt Hole (B) No. of
Bolt Holes
1/2″ 3.75″ 2.62″ 0.12″ .250″ 0.81″ 0.56″ 0.62″ 4
3/4″ 4.62″ 3.25″ 0.12″ .250″ 0.87″ 0.62″ 0.75″ 4
1″ 4.88″ 3.50″ 0.12″ .250″ 0.94″ 0.69″ 0.75″ 4
1-1/4″ 5.25″ 3.88″ 0.19″ .250″ 1.06″ 0.81″ 0.75″ 4
1-1/2″ 6.12″ 4.50″ 0.25″ .250″ 1.13″ 0.88″ 0.88″ 4
2″ 6.50″ 5.00″ 0.31″ .250″ 1.25″ 1.00″ 0.75″ 8
2-1/2″ 7.50″ 5.88″ 0.31″ .250″ 1.37″ 1.12″ 0.88″ 8
3″ 8.25″ 6.62″ 0.38″ .250″ 1.50″ 1.25″ 0.88″ 8
3-1/2″ 9.00″ 7.25″ 0.38″ .250″ 1.63″ 1.38″ 1.00″ 8
4″ 10.00″ 7.88″ 0.44″ .250″ 1.63″ 1.38″ 1.00″ 8
5″ 11.00″ 9.25″ 0.44″ .250″ 1.75″ 1.50″ 1.00″ 8
6″ 12.50″ 10.62″ 0.50″ .250″ 1.87″ 1.62″ 1.00″ 12
8″ 15.00″ 13.00″ 0.50″ .250″ 2.13″ 1.88″ 1.12″ 12
10″ 17.50″ 15.25″ 0.50″ .250″ 2.37″ 2.12″ 1.25″ 16
12″ 20.50″ 17.75″ 0.50″ .250″ 2.50″ 2.25″ 1.38″ 16
14″ 23.00″ 20.25″ 0.50″ .250″ 2.63″ 2.38″ 1.38″ 20
16″ 25.50″ 22.50″ 0.50″ .250″ 2.75″ 2.50″ 1.50″ 20
18″ 28.00″ 24.75″ 0.50″ .250″ 2.87″ 2.62″ 1.50″ 24
20″ 30.50″ 27.00″ 0.50″ .250″ 3.00″ 2.75″ 1.62″ 24
22″ 33.00″ 29.25″ 0.50″ .250″ 3.13″ 2.88″ 1.75″ 24
24″ 36.00″ 32.00″ 0.50″ .250″ 3.25″ 3.00″ 1.88″ 24

 

BLIND FLANGE DIMENSIONS CLASS 600 ASME B16.5

Blind Flange Dimension ASME B16.5

FLANGE
NPS
Outside
Diameter
Bolt Circle (BC) Raised Face (R) Raised Face (RF) Raised Face
Thickness (T)
Flat Face
Thickness (T2)
Bolt Hole (B) No. of
Bolt Holes
1/2″ 3.75″ 2.62″ 1.38″ .250″ 0.81″ 0.56″ 0.62″ 4
3/4″ 4.62″ 3.25″ 1.69″ .250″ 0.87″ 0.62″ 0.75″ 4
1″ 4.88″ 3.50″ 2.00″ .250″ 0.94″ 0.69″ 0.75″ 4
1-1/4″ 5.25″ 3.88″ 2.50″ .250″ 1.06″ 0.81″ 0.75″ 4
1-1/2″ 6.12″ 4.50″ 2.88″ .250″ 1.13″ 0.88″ 0.88″ 4
2″ 6.50″ 5.00″ 3.62″ .250″ 1.25″ 1.00″ 0.75″ 8
2-1/2″ 7.50″ 5.88″ 4.12″ .250″ 1.37″ 1.12″ 0.88″ 8
3″ 8.25″ 6.62″ 5.00″ .250″ 1.50″ 1.25″ 0.88″ 8
3-1/2″ 9.00″ 7.25″ 5.50″ .250″ 1.63″ 1.38″ 1.00″ 8
4″ 10.75″ 8.50″ 6.19″ .250″ 1.75″ 1.5″ 1.00″ 8
5″ 13.00″ 10.50″ 7.31″ .250″ 2.00″ 1.75″ 1.12″ 8
6″ 14.00″ 11.50″ 8.50″ .250″ 2.13″ 1.88″ 1.12″ 12
8″ 16.50″ 13.75″ 10.62″ .250″ 2.44″ 2.19″ 1.25″ 12
10″ 20.00″ 17.00″ 12.75″ .250″ 2.75″ 2.50″ 1.38″ 16
12″ 22.00″ 19.25″ 15.00″ .250″ 2.87″ 2.62″ 1.38″ 20
14″ 23.75″ 20.75″ 16.25″ .250″ 3.00″ 2.75″ 1.50″ 20
16″ 27.00″ 23.75″ 18.50″ .250″ 3.25″ 3.00″ 1.62″ 20
18″ 29.25″ 25.75″ 21.00″ .250″ 3.50″ 3.25″ 1.75″ 20
20″ 32.00″ 28.50″ 23.00″ .250″ 3.75″ 3.50″ 1.75″ 24
22″ 34.25″ 30.63″ 25.25″ .250″ 4.00″ 3.75″ 1.75″ 24
24″ 37.00″ 33.00″ 27.25″ .250″ 4.25″ 4.00″ 2.00″ 24

 

BLIND FLANGE DIMENSIONS CLASS 900 ASME B16.5

Blind Flange Dimension ASME B16.5

FLANGE
NPS
Outside
Diameter
Bolt Circle (BC) Raised Face (R) Raised Face (RF) Raised Face
Thickness (T)
Flat Face
Thickness (T2)
Bolt Hole (B) No. of
Bolt Holes
3″ 9.50″ 7.50″ 5.00″ .250″ 1.75″ 1.50″ 1.00″ 8
4″ 11.50″ 9.25″ 6.19″ .250″ 2.00″ 1.75″ 1.25″ 8
5″ 13.75″ 11.00″ 7.31″ .250″ 3.25″ 3.00″ 1.38″ 8
6″ 15.00″ 12.50″ 8.50″ .250″ 2.44″ 2.19″ 1.25″ 12
8″ 18.50″ 15.50″ 10.63″ .250″ 2.75″ 2.50″ 1.50″ 12
10″ 21.50″ 18.50″ 12.75″ .250″ 3.00″ 2.75″ 1.50″ 16
12″ 24.00″ 21.00″ 15.00″ .250″ 3.38″ 3.13″ 1.50″ 20
14″ 25.25″ 22.00″ 16.25″ .250″ 3.63″ 3.38″ 1.63″ 20
16″ 27.75″ 24.25″ 18.50″ .250″ 3.75″ 3.50″ 1.75″ 20
18″ 31.00″ 27.00″ 21.00″ .250″ 4.25″ 4.00″ 2.00″ 20
20″ 33.75″ 29.50″ 23.00″ .250″ 4.50″ 4.25″ 2.13″ 20
24″ 41.00″ 35.50″ 27.25″ .250″ 5.75″ 5.50″ 2.63″ 20

 

BLIND FLANGE DIMENSIONS CLASS 1500 ASME B16.5

Blind Flange Dimension ASME B16.5

Outside
Diameter
Bolt Circle (BC) Raised Face (R) Raised Face (RF) Raised Face
Thickness (T)
Flat Face
Thickness (T2)
Bolt Hole (B) No. of
Bolt Holes
4.75″ 3.25″ 1.38″ .250″ 1.13″ 0.88″ 0.88″ 4
5.13″ 3.50″ 1.69″ .250″ 1.25″ 1.00″ 0.88″ 4
5.88″ 4.00″ 2.00″ .250″ 1.38″ 1.13″ 1.00″ 4
6.25″ 4.38″ 2.50″ .250″ 1.38″ 1.13″ 1.00″ 4
7.00″ 4.88″ 2.88″ .250″ 1.50″ 1.25″ 1.13″ 4
8.50″ 6.50″ 3.63″ .250″ 1.75″ 1.50″ 1.00″ 8
9.63″ 7.50″ 4.13″ .250″ 1.88″ 1.63″ 1.13″ 8
10.50″ 8.00″ 5.00″ .250″ 2.13″ 1.88″ 1.25″ 8
12.25″ 9.50″ 6.19″ .250″ 2.38″ 2.13″ 1.38″ 8
14.75″ 11.50″ 7.31″ .250″ 3.13″ 2.88″ 1.63″ 8
15.50″ 12.50″ 8.50″ .250″ 3.50″ 3.25″ 1.50″ 12
19.00″ 15.50″ 10.63″ .250″ 3.88″ 3.63″ 1.75″ 12
23.00″ 19.00″ 12.75″ .250″ 4.50″ 4.25″ 2.00″ 12
26.50″ 22.50″ 15.00″ .250″ 5.13″ 4.88″ 2.13″ 16
29.50″ 25.00″ 16.25″ .250″ 5.50″ 5.25″ 2.38″ 16
32.50″ 27.75″ 18.50″ .250″ 6.00″ 5.75″ 2.63″ 16
36.00″ 30.50″ 21.00″ .250″ 6.63″ 6.38″ 2.88″ 16
38.75″ 32.75″ 23.00″ .250″ 7.25″ 7.00″ 3.13″ 16
46.00″ 39.00″ 27.25″ .250″ 8.25″ 8.00″ 3.63″ 16

 

BLIND FLANGE DIMENSIONS CLASS 2500 ASME B16.5

Blind Flange Dimension ASME B16.5

FLANGE
NPS
Outside
Diameter
Bolt Circle (BC) Raised Face (R) Raised Face (RF) Raised Face
Thickness (T)
Flat Face
Thickness (T2)
Bolt Hole (B) No. of
Bolt Holes
1/2″ 5.25″ 3.50″ 1.38″ .250″ 1.44″ 1.19″ 0.88″ 4
3/4″ 5.50″ 3.75″ 1.69″ .250″ 1.50″ 1.25″ 0.88″ 4
1″ 6.25″ 4.25″ 2.00″ .250″ 1.63″ 1.38″ 1.00″ 4
1-1/4″ 7.25″ 5.13″ 2.50″ .250″ 1.75″ 1.50″ 1.13″ 4
1-1/2″ 8.00″ 5.75″ 2.88″ .250″ 2.00″ 1.75″ 1.25″ 4
2″ 9.25″ 6.75″ 3.63″ .250″ 2.25″ 2.00″ 1.13″ 8
2-1/2″ 10.50″ 7.75″ 4.13″ .250″ 2.50″ 2.25″ 1.25″ 8
3″ 12.00″ 9.00″ 5.00″ .250″ 2.88″ 2.63″ 1.38″ 8
4″ 14.00″ 10.75″ 6.19″ .250″ 3.25″ 3.00″ 1.63″ 8
5″ 16.50″ 12.75″ 7.31″ .250″ 3.88″ 3.63″ 1.88″ 8
6″ 19.00″ 14.50″ 8.50″ .250″ 4.50″ 4.25″ 2.13″ 8
8″ 21.75″ 17.25″ 10.63″ .250″ 5.25″ 5.00″ 2.13″ 12
10″ 26.50″ 21.25″ 12.75″ .250″ 6.75″ 6.50″ 2.63″ 12
12″ 30.00″ 24.38″ 15.00″ .250″ 7.50″ 7.25″ 2.88″ 12