The charts show the dimensions of weld neck flange class 150, 300, 400, 900, 1500, 2500 in inches and in millimeters (with dimensional tolerances).
WELDING NECK FLANGE DIMENSIONS IN INCHES
WN CLASS 150 (IN INCH)
Weld neck flange dimensions class 150 (ASME B16.5) in inches
| Flange NPS | Inside Diameter |
Outside Diameter |
Bolt Circle (BC) |
Raised Face (R) |
Raised Face (RF) |
H | H1 | Raised Face Thickness (T) |
T1 | Flat Face Thickness (T2) |
Bolt Hole (B) |
No. of Bolt Holes |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1/2″ | 0.62″ | 3.50″ | 2.38″ | 1.38″ | .063″ | 1.19″ | 0.84″ | 1.88″ | .38″ | 1.82″ | .62″ | 4 |
| 3/4″ | 0.82″ | 3.88″ | 2.75″ | 1.69″ | .063″ | 1.50″ | 1.05″ | 2.06″ | .44″ | 2.00″ | .62″ | 4 |
| 1″ | 1.05″ | 4.25″ | 3.12″ | 2.00″ | .063″ | 1.94″ | 1.32″ | 2.19″ | .50″ | 2.13″ | .62″ | 4 |
| 1-1/4″ | 1.38″ | 4.62″ | 3.50″ | 2.50″ | .063″ | 2.31″ | 1.66″ | 2.25″ | .56″ | 2.19″ | .62″ | 4 |
| 1-1/2″ | 1.61″ | 5.00″ | 3.88″ | 2.88″ | .063″ | 2.56″ | 1.90″ | 2.44″ | .62″ | 2.38″ | .62″ | 4 |
| 2″ | 2.07″ | 6.00″ | 4.75″ | 3.62″ | .063″ | 3.06″ | 2.38″ | 2.50″ | .69″ | 2.44″ | .75″ | 4 |
| 2-1/2″ | 2.47″ | 7.00″ | 5.50″ | 4.12″ | .063″ | 3.56″ | 2.88″ | 2.75″ | .82″ | 2.69″ | .75″ | 4 |
| 3″ | 3.07″ | 7.50″ | 6.00″ | 5.00″ | .063″ | 4.25″ | 3.50″ | 2.75″ | .88″ | 2.69″ | .75″ | 4 |
| 3-1/2″ | 3.55″ | 8.50″ | 7.00″ | 5.50″ | .063″ | 4.81″ | 4.00″ | 2.81″ | .88″ | 2.75″ | .75″ | 8 |
| 4″ | 4.03″ | 9.00″ | 7.50″ | 6.19″ | .063″ | 5.31″ | 4.50″ | 3.00″ | .88″ | 2.94″ | .75″ | 8 |
| 5″ | 5.05″ | 10.00″ | 8.50″ | 7.31″ | .063″ | 6.44″ | 5.56″ | 3.50″ | .88″ | 3.44″ | .88″ | 8 |
| 6″ | 6.07″ | 11.00″ | 9.50″ | 8.50″ | .063″ | 7.56″ | 6.63″ | 3.50″ | .94″ | 3.44″ | .88″ | 8 |
| 8″ | 7.98″ | 13.50″ | 11.75″ | 10.62″ | .063″ | 9.69″ | 8.63″ | 4.00″ | 1.06″ | 3.94″ | .88″ | 8 |
| 10″ | 10.02″ | 16.00″ | 14.25″ | 12.75″ | .063″ | 12.00″ | 10.75″ | 4.00″ | 1.13″ | 3.94″ | 1.00″ | 12 |
| 12″ | 12.00″ | 19.00″ | 17.00″ | 15.00″ | .063″ | 14.38″ | 12.75″ | 4.50″ | 1.19″ | 4.44″ | 1.00″ | 12 |
| 14″ | 13.25″ | 21.00″ | 18.75″ | 16.25″ | .063″ | 15.75″ | 14.00″ | 5.00″ | 1.32″ | 4.94″ | 1.12″ | 12 |
| 16″ | 15.25″ | 23.50″ | 21.25″ | 18.50″ | .063″ | 18.00″ | 16.00″ | 5.00″ | 1.38″ | 4.94″ | 1.12″ | 16 |
| 18″ | 17.25″ | 25.00″ | 22.75″ | 21.00″ | .063″ | 19.88″ | 18.00″ | 5.50″ | 1.50″ | 5.44″ | 1.25″ | 16 |
| 20″ | 19.25″ | 27.50″ | 25.00″ | 23.00″ | .063″ | 22.00″ | 20.00″ | 5.69″ | 1.63″ | 5.63″ | 1.25″ | 20 |
| 22″ | 21.25″ | 29.50″ | 27.25″ | 25.25″ | .063″ | 24.25″ | 22.00″ | 5.88″ | 1.75″ | 5.82″ | 1.38″ | 20 |
| 24″ | 23.25″ | 32.00″ | 29.50″ | 27.25″ | .063″ | 26.12″ | 24.00″ | 6.00″ | 1.82″ | 5.94″ | 1.38″ | 20 |
WN CLASS 300 (IN INCH)
Weld neck flange dimensions class 300 (ASME B16.5) in inches
| Flange NPS | Inside Diameter |
Outside Diameter |
Bolt Circle (BC) |
Raised Face (R) |
Raised Face (RF) |
H | H1 | Raised Face Thickness (T) |
T1 | Flat Face Thickness (T2) |
Bolt Hole (B) |
No. of Bolt Holes |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1/2″ | 0.62″ | 3.75″ | 2.62″ | 1.38″ | .063″ | 1.50″ | 0.84″ | 2.06″ | .50″ | 2.00″ | 0.62″ | 4 |
| 3/4″ | 0.82″ | 4.62″ | 3.25″ | 1.69″ | .063″ | 1.88″ | 1.05″ | 2.25″ | .56″ | 2.19″ | 0.75″ | 4 |
| 1″ | 1.05″ | 4.88″ | 3.50″ | 2.00″ | .063″ | 2.12″ | 1.32″ | 2.44″ | .63″ | 2.38″ | 0.75″ | 4 |
| 1-1/4″ | 1.38″ | 5.25″ | 3.88″ | 2.50″ | .063″ | 2.50″ | 1.66″ | 2.56″ | .69″ | 2.50″ | 0.75″ | 4 |
| 1-1/2″ | 1.61″ | 6.12″ | 4.50″ | 2.88″ | .063″ | 2.75″ | 1.90″ | 2.69″ | .75″ | 2.63″ | 0.88″ | 4 |
| 2″ | 2.07″ | 6.50″ | 5.00″ | 3.62″ | .063″ | 3.31″ | 2.38″ | 2.75″ | .82″ | 2.69″ | 0.75″ | 8 |
| 2-1/2″ | 2.47″ | 7.50″ | 5.88″ | 4.12″ | .063″ | 3.94″ | 2.88″ | 3.00″ | .94″ | 2.94″ | 0.88″ | 8 |
| 3″ | 3.07″ | 8.25″ | 6.62″ | 5.00″ | .063″ | 4.62″ | 3.50″ | 3.12″ | 1.06″ | 3.06″ | 0.88″ | 8 |
| 3-1/2″ | 3.55″ | 9.00″ | 7.25″ | 5.50″ | .063″ | 5.25″ | 4.00″ | 3.19″ | 1.13″ | 3.13″ | 0.88″ | 8 |
| 4″ | 4.03″ | 10.00″ | 7.88″ | 6.19″ | .063″ | 5.75″ | 4.50″ | 3.38″ | 1.19″ | 3.32″ | 0.88″ | 8 |
| 5″ | 5.05″ | 11.00″ | 9.25″ | 7.31″ | .063″ | 7.00″ | 5.56″ | 3.88″ | 1.32″ | 3.82″ | 0.88″ | 8 |
| 6″ | 6.07″ | 12.50″ | 10.62″ | 8.50″ | .063″ | 8.12″ | 6.63″ | 3.88″ | 1.38″ | 3.82″ | 0.88″ | 12 |
| 8″ | 7.98″ | 15.00″ | 13.00″ | 10.62″ | .063″ | 10.25″ | 8.63″ | 4.38″ | 1.56″ | 4.32″ | 1.00″ | 12 |
| 10″ | 10.02″ | 17.50″ | 15.25″ | 12.75″ | .063″ | 12.62″ | 10.75″ | 4.62″ | 1.82″ | 4.56″ | 1.12″ | 16 |
| 12″ | 12.00″ | 20.50″ | 17.75″ | 15.00″ | .063″ | 14.75″ | 12.75″ | 5.12″ | 1.94″ | 5.06″ | 1.25″ | 16 |
| 14″ | 13.25″ | 23.00″ | 20.25″ | 16.25″ | .063″ | 16.75″ | 14.00″ | 5.62″ | 2.06″ | 5.56″ | 1.25″ | 20 |
| 16″ | 15.25″ | 25.50″ | 22.50″ | 18.50″ | .063″ | 19.00″ | 16.00″ | 5.75″ | 2.19″ | 5.69″ | 1.38″ | 20 |
| 18″ | 17.25″ | 28.00″ | 24.75″ | 21.00″ | .063″ | 21.00″ | 18.00″ | 6.25″ | 2.32″ | 6.19″ | 1.38″ | 24 |
| 20″ | 19.25″ | 30.50″ | 27.00″ | 23.00″ | .063″ | 23.12″ | 20.00″ | 6.38″ | 2.44″ | 6.32″ | 1.38″ | 24 |
| 22″ | 21.25″ | 33.00″ | 29.25″ | 25.25″ | .063″ | 25.25″ | 22.00″ | 6.50″ | 2.57″ | 6.44″ | 1.62″ | 24 |
| 24″ | 23.25″ | 36.00″ | 32.0″ | 27.25″ | .063″ | 27.62″ | 24.00″ | 6.62″ | 2.69″ | 6.56″ | 1.62″ | 24 |
WN CLASS 400 (IN INCH)
Weld neck flange dimensions class 400 (ASME B16.5) in inches
| Flange NPS | Inside Diameter |
Outside Diameter |
Bolt Circle (BC) |
Raised Face (R) |
Raised Face (RF) |
H | H1 | Raised Face Thickness (T) |
T1 | Flat Face Thickness (T2) |
Bolt Hole (B) |
No. of Bolt Holes |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1/2″ | .55″ | 3.75″ | 2.62″ | 1.38″ | .250″ | 1.50″ | 0.84″ | 2.31″ | 0.56″ | 2.06″ | 0.62″ | 4 |
| 3/4″ | .74″ | 4.62″ | 3.25″ | 1.69″ | .250″ | 1.88″ | 1.05″ | 2.50″ | 0.62″ | 2.25″ | 0.75″ | 4 |
| 1″ | .96″ | 4.88″ | 3.50″ | 2.00″ | .250″ | 2.12″ | 1.32″ | 2.69″ | 0.69″ | 2.44″ | 0.75″ | 4 |
| 1-1/4″ | 1.28″ | 5.25″ | 3.88″ | 2.50″ | .250″ | 2.50″ | 1.66″ | 2.87″ | 0.81″ | 2.62″ | 0.75″ | 4 |
| 1-1/2″ | 1.50″ | 6.12″ | 4.50″ | 2.88″ | .250″ | 2.75″ | 1.90″ | 3.00″ | 0.88″ | 2.75″ | 0.88″ | 4 |
| 2″ | 1.94″ | 6.50″ | 5.00″ | 3.62″ | .250″ | 3.31″ | 2.38″ | 3.13″ | 1.00″ | 2.88″ | 0.75″ | 8 |
| 2-1/2″ | 2.32″ | 7.50″ | 5.88″ | 4.12″ | .250″ | 3.94″ | 2.88″ | 3.37″ | 1.12″ | 3.12″ | 0.88″ | 8 |
| 3″ | 2.90″ | 8.25″ | 6.62″ | 5.00″ | .250″ | 4.62″ | 3.50″ | 3.50″ | 1.25″ | 3.25″ | 0.88″ | 8 |
| 3-1/2″ | 3.36″ | 9.00″ | 7.25″ | 5.50″ | .250″ | 5.25″ | 4.00″ | 3.63″ | 1.38″ | 3.38″ | 1.00″ | 8 |
| 4″ | 3.83″ | 10.00″ | 7.88″ | 6.19″ | .250″ | 5.75″ | 4.50″ | 3.75″ | 1.38″ | 3.50″ | 1.00″ | 8 |
| 5″ | 4.81″ | 11.00″ | 9.25″ | 7.31″ | .250″ | 7.00″ | 5.56″ | 4.25″ | 1.50″ | 4.00″ | 1.00″ | 8 |
| 6″ | 5.76″ | 12.50″ | 10.62″ | 8.50″ | .250″ | 8.12″ | 6.63″ | 4.31″ | 1.62″ | 4.06″ | 1.00″ | 12 |
| 8″ | 7.63″ | 15.00″ | 13.00″ | 10.62″ | .250″ | 10.25″ | 8.63″ | 4.87″ | 1.88″ | 4.62″ | 1.12″ | 12 |
| 10″ | 9.75″ | 17.50″ | 15.25″ | 12.75″ | .250″ | 12.62″ | 10.75″ | 5.13″ | 2.12″ | 4.88″ | 1.25″ | 16 |
| 12″ | 11.75″ | 20.50″ | 17.75″ | 15.00″ | .250″ | 14.75″ | 12.75″ | 5.63″ | 2.25″ | 5.38″ | 1.38″ | 16 |
| 14″ | 13.00″ | 23.00″ | 20.25″ | 16.25″ | .250″ | 16.75″ | 14.00″ | 6.13″ | 2.38″ | 5.88″ | 1.38″ | 20 |
| 16″ | 15.00″ | 25.50″ | 22.50″ | 18.50″ | .250″ | 19.00″ | 16.00″ | 6.25″ | 2.50″ | 6.00″ | 1.50″ | 20 |
| 18″ | 17.00″ | 28.00″ | 24.75″ | 21.00″ | .250″ | 21.00″ | 18.00″ | 6.75″ | 2.62″ | 6.50″ | 1.50″ | 24 |
| 20″ | 19.00″ | 30.50″ | 27.00″ | 23.00″ | .250″ | 23.12″ | 20.00″ | 6.87″ | 2.75″ | 6.62″ | 1.62″ | 24 |
| 22″ | 21.00″ | 33.00″ | 29.25″ | 25.25″ | .250″ | 25.25″ | 22.00″ | 7.00″ | 2.88″ | 6.75″ | 1.75″ | 24 |
| 24″ | 23.00″ | 36.00″ | 32.00″ | 27.25″ | .250″ | 27.62″ | 24.00″ | 7.13″ | 3.00″ | 6.88″ | 1.88″ | 24 |
WN CLASS 600 (IN INCH)
Weld neck flange dimensions class 600 (ASME B16.5) in inches
| Flange NPS | Inside Diameter |
Outside Diameter |
Bolt Circle (BC) |
Raised Face (R) |
Raised Face (RF) |
H | H1 | Raised Face Thickness (T) |
T1 | Flat Face Thickness (T2) |
Bolt Hole (B) |
No. of Bolt Holes |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1/2″ | 0.55″ | 3.75″ | 2.62″ | 1.38″ | .250″ | 1.50″ | 0.84″ | 2.31″ | 0.56″ | 2.06″ | 0.62″ | 4 |
| 3/4″ | 0.74″ | 4.62″ | 3.25″ | 1.69″ | .250″ | 1.88″ | 1.05″ | 2.50″ | 0.62″ | 2.25″ | 0.75″ | 4 |
| 1″ | 0.96″ | 4.88″ | 3.50″ | 2.00″ | .250″ | 2.12″ | 1.32″ | 2.69″ | 0.69″ | 2.44″ | 0.75″ | 4 |
| 1-1/4″ | 1.28″ | 5.25″ | 3.88″ | 2.50″ | .250″ | 2.50″ | 1.66″ | 2.87″ | 0.81″ | 2.62″ | 0.75″ | 4 |
| 1-1/2″ | 1.50″ | 6.12″ | 4.50″ | 2.88″ | .250″ | 2.75″ | 1.90″ | 3.00″ | 0.88″ | 2.75″ | 0.88″ | 4 |
| 2″ | 1.94″ | 6.50″ | 5.00″ | 3.62″ | .250″ | 3.31″ | 2.38″ | 3.13″ | 1.00″ | 2.88″ | 0.75″ | 8 |
| 2-1/2″ | 2.32″ | 7.50″ | 5.88″ | 4.12″ | .250″ | 3.94″ | 2.88″ | 3.37″ | 1.12″ | 3.12″ | 0.88″ | 8 |
| 3″ | 2.90″ | 8.25″ | 6.62″ | 5.00″ | .250″ | 4.62″ | 3.50″ | 3.50″ | 1.25″ | 3.25″ | 0.88″ | 8 |
| 3-1/2″ | 3.36″ | 9.00″ | 7.25″ | 5.50″ | .250″ | 5.25″ | 4.00″ | 3.63″ | 1.38″ | 3.38″ | 1.00″ | 8 |
| 4″ | 3.83″ | 10.75″ | 8.50″ | 6.19″ | .250″ | 6.00″ | 4.50″ | 4.25″ | 1.5″ | 4.00″ | 1.00″ | 8 |
| 5″ | 4.81″ | 13.00″ | 10.50″ | 7.31″ | .250″ | 7.44″ | 5.56″ | 4.75″ | 1.75″ | 4.50″ | 1.12″ | 8 |
| 6″ | 5.76″ | 14.00″ | 11.50″ | 8.50″ | .250″ | 8.75″ | 6.63″ | 4.87″ | 1.88″ | 4.62″ | 1.12″ | 12 |
| 8″ | 7.63″ | 16.50″ | 13.75″ | 10.62″ | .250″ | 10.75″ | 8.63″ | 5.50″ | 2.19″ | 5.25″ | 1.25″ | 12 |
| 10″ | 9.75″ | 20.00″ | 17.00″ | 12.75″ | .250″ | 13.5″ | 10.75″ | 6.25″ | 2.50″ | 6.00″ | 1.38″ | 16 |
| 12″ | 11.75″ | 22.00″ | 19.25″ | 15.00″ | .250″ | 15.75″ | 12.75″ | 6.37″ | 2.62″ | 6.12″ | 1.38″ | 20 |
| 14″ | 13.00″ | 23.75″ | 20.75″ | 16.25″ | .250″ | 17.00″ | 14.00″ | 6.75″ | 2.75″ | 6.50″ | 1.50″ | 20 |
| 16″ | 15.00″ | 27.00″ | 23.75″ | 18.50″ | .250″ | 19.50″ | 16.00″ | 7.25″ | 3.00″ | 7.00″ | 1.62″ | 20 |
| 18″ | 17.00″ | 29.25″ | 25.75″ | 21.00″ | .250″ | 21.50″ | 18.00″ | 7.50″ | 3.25″ | 7.25″ | 1.75″ | 20 |
| 20″ | 19.00″ | 32.00″ | 28.50″ | 23.00″ | .250″ | 24.00″ | 20.00″ | 7.75″ | 3.50″ | 7.50″ | 1.75″ | 24 |
| 22″ | 21.00″ | 34.25″ | 30.63″ | 25.25″ | .250″ | 26.25″ | 22.00″ | 8.00″ | 3.75″ | 7.75″ | 1.75″ | 24 |
| 24″ | 23.00″ | 37.00″ | 33.00″ | 27.25″ | .250″ | 28.25″ | 24.00″ | 8.25″ | 4.00″ | 8.00″ | 2.00″ | 24 |
WN CLASS 900 (IN INCH)
Weld neck flange dimensions class 900 (ASME B16.5) in inches
| Flange NPS | Inside Diameter |
Outside Diameter |
Bolt Circle (BC) |
Raised Face (R) |
Raised Face (RF) |
H | H1 | Raised Face Thickness (T) |
T1 | Flat Face Thickness (T2) |
Bolt Hole (B) |
No. of Bolt Holes |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 3″ | 2.90″ | 9.50″ | 7.50″ | 5.00″ | .250″ | 5.00″ | 3.50″ | 4.25″ | 1.50″ | 4.00″ | 1.00″ | 8 |
| 4″ | 3.83″ | 11.50″ | 9.25″ | 6.19″ | .250″ | 6.25″ | 4.50″ | 4.75″ | 1.75″ | 4.50″ | 1.25″ | 8 |
| 5″ | 4.81″ | 13.75″ | 11.00″ | 7.31″ | .250″ | 7.50″ | 5.56″ | 5.25″ | 3.00″ | 5.00″ | 1.38″ | 8 |
| 6″ | 5.76″ | 15.00″ | 12.50″ | 8.50″ | .250″ | 9.25″ | 6.63″ | 5.75″ | 2.19″ | 5.50″ | 1.25″ | 12 |
| 8″ | 7.63″ | 18.50″ | 15.50″ | 10.63″ | .250″ | 11.75″ | 8.63″ | 6.63″ | 2.50″ | 6.38″ | 1.50″ | 12 |
| 10″ | 9.75″ | 21.50″ | 18.50″ | 12.75″ | .250″ | 14.50″ | 10.75″ | 7.50″ | 2.75″ | 7.25″ | 1.50″ | 16 |
| 12″ | 11.75″ | 24.00″ | 21.00″ | 15.00″ | .250″ | 16.50″ | 12.75″ | 8.13″ | 3.13″ | 7.88″ | 1.50″ | 20 |
| 14″ | 13.00″ | 25.25″ | 22.00″ | 16.25″ | .250″ | 17.75″ | 14.00″ | 8.63″ | 3.38″ | 8.38″ | 1.63″ | 20 |
| 16″ | 15.00″ | 27.75″ | 24.25″ | 18.50″ | .250″ | 20.00″ | 16.00″ | 8.75″ | 3.50″ | 8.50″ | 1.75″ | 20 |
| 18″ | 17.00″ | 31.00″ | 27.00″ | 21.00″ | .250″ | 22.25″ | 18.00″ | 9.25″ | 4.00″ | 9.00″ | 2.00″ | 20 |
| 20″ | 19.00″ | 33.75″ | 29.50″ | 23.00″ | .250″ | 24.50″ | 20.00″ | 10.00″ | 4.25″ | 9.75″ | 2.13″ | 20 |
| 24″ | 23.00″ | 41.00″ | 35.50″ | 27.25″ | .250″ | 29.50″ | 24.00″ | 11.75″ | 5.50″ | 11.50″ | 2.63″ | 20 |
WN CLASS 1500 (IN INCH)
Weld neck flange dimensions class 1500 (ASME B16.5) in inches
| Flange NPS | Inside Diameter |
Outside Diameter |
Bolt Circle (BC) |
Raised Face (R) |
Raised Face (RF) |
H | H1 | Raised Face Thickness (T) |
T1 | Flat Face Thickness (T2) |
Bolt Hole (B) |
No. of Bolt Holes |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1/2″ | 0.55″ | 4.75″ | 3.25″ | 1.38″ | .250″ | 1.50″ | 0.84″ | 2.63″ | 0.88″ | 2.38″ | 0.88″ | 4 |
| 3/4″ | 0.74″ | 5.13″ | 3.50″ | 1.69″ | .250″ | 1.75″ | 1.05″ | 3.00″ | 1.00″ | 2.75″ | 0.88″ | 4 |
| 1″ | 0.96″ | 5.88″ | 4.00″ | 2.00″ | .250″ | 2.06″ | 1.32″ | 3.13″ | 1.13″ | 2.88″ | 1.00″ | 4 |
| 1-1/4″ | 1.28″ | 6.25″ | 4.38″ | 2.50″ | .250″ | 2.50″ | 1.66″ | 3.13″ | 1.13″ | 2.88″ | 1.00″ | 4 |
| 1-1/2″ | 1.50″ | 7.00″ | 4.88″ | 2.88″ | .250″ | 2.75″ | 1.90″ | 3.50″ | 1.25″ | 3.25″ | 1.13″ | 4 |
| 2″ | 1.94″ | 8.50″ | 6.50″ | 3.63″ | .250″ | 4.13″ | 2.38″ | 4.25″ | 1.50″ | 4.00″ | 1.00″ | 8 |
| 2-1/2″ | 2.32″ | 9.63″ | 7.50″ | 4.13″ | .250″ | 4.88″ | 2.88″ | 4.38″ | 1.63″ | 4.13″ | 1.13″ | 8 |
| 3″ | 2.90″ | 10.50″ | 8.00″ | 5.00″ | .250″ | 5.25″ | 3.50″ | 4.88″ | 1.88″ | 4.63″ | 1.25″ | 8 |
| 4″ | 3.83″ | 12.25″ | 9.50″ | 6.19″ | .250″ | 6.38″ | 4.50″ | 5.13″ | 2.13″ | 4.88″ | 1.38″ | 8 |
| 5″ | 4.81″ | 14.75″ | 11.50″ | 7.31″ | .250″ | 7.75″ | 5.56″ | 6.38″ | 2.88″ | 6.13″ | 1.63″ | 8 |
| 6″ | 5.76″ | 15.50″ | 12.50″ | 8.50″ | .250″ | 9.00″ | 6.63″ | 7.00″ | 3.25″ | 6.75″ | 1.50″ | 12 |
| 8″ | 7.63″ | 19.00″ | 15.50″ | 10.63″ | .250″ | 11.50″ | 8.63″ | 8.63″ | 3.63″ | 8.38″ | 1.75″ | 12 |
| 10″ | 9.75″ | 23.00″ | 19.00″ | 12.75″ | .250″ | 14.50″ | 10.75″ | 10.25″ | 4.25″ | 10.00″ | 2.00″ | 12 |
| 12″ | 11.75″ | 26.50″ | 22.50″ | 15.00″ | .250″ | 17.75″ | 12.75″ | 11.38″ | 4.88″ | 11.13″ | 2.13″ | 16 |
| 14″ | 13.00″ | 29.50″ | 25.00″ | 16.25″ | .250″ | 19.50″ | 14.00″ | 12.00″ | 5.25″ | 11.75″ | 2.38″ | 16 |
| 16″ | 15.00″ | 32.50″ | 27.75″ | 18.50″ | .250″ | 21.75″ | 16.00″ | 12.50″ | 5.75″ | 12.25″ | 2.63″ | 16 |
| 18″ | 17.00″ | 36.00″ | 30.50″ | 21.00″ | .250″ | 23.50″ | 18.00″ | 13.13″ | 6.38″ | 12.88″ | 2.88″ | 16 |
| 20″ | 19.00″ | 38.75″ | 32.75″ | 23.00″ | .250″ | 25.25″ | 20.00″ | 14.25″ | 7.00″ | 14.00″ | 3.13″ | 16 |
| 24″ | 23.00″ | 46.00″ | 39.00″ | 27.25″ | .250″ | 30.00″ | 24.00″ | 16.25″ | 8.00″ | 16.00″ | 3.63″ | 16 |
WN CLASS 2500 (IN INCH)
Weld neck flange dimensions class 2500 (ASME B16.5) in inches
| Flange NPS | Inside Diameter |
Outside Diameter |
Bolt Circle (BC) |
Raised Face (R) |
Raised Face (RF) |
H | H1 | Raised Face Thickness (T) |
T1 | Flat Face Thickness (T2) |
Bolt Hole (B) |
No. of Bolt Holes |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1/2″ | 0.55″ | 5.25″ | 3.50″ | 1.38″ | .250″ | 1.69″ | 0.84″ | 3.13″ | 1.19″ | 2.88″ | 0.88″ | 4 |
| 3/4″ | 0.74″ | 5.50″ | 3.75″ | 1.69″ | .250″ | 2.00″ | 1.05″ | 3.38″ | 1.25″ | 3.13″ | 0.88″ | 4 |
| 1″ | 0.96″ | 6.25″ | 4.25″ | 2.00″ | .250″ | 2.25″ | 1.32″ | 3.75″ | 1.38″ | 3.50″ | 1.00″ | 4 |
| 1-1/4″ | 1.28″ | 7.25″ | 5.13″ | 2.50″ | .250″ | 2.88″ | 1.66″ | 4.00″ | 1.50″ | 3.75″ | 1.13″ | 4 |
| 1-1/2″ | 1.50″ | 8.00″ | 5.75″ | 2.88″ | .250″ | 3.13″ | 1.90″ | 4.63″ | 1.75″ | 4.38″ | 1.25″ | 4 |
| 2″ | 1.94″ | 9.25″ | 6.75″ | 3.63″ | .250″ | 3.75″ | 2.38″ | 5.25″ | 2.00″ | 5.00″ | 1.13″ | 8 |
| 2-1/2″ | 2.32″ | 10.50″ | 7.75″ | 4.13″ | .250″ | 4.50″ | 2.88″ | 5.88″ | 2.25″ | 5.63″ | 1.25″ | 8 |
| 3″ | 2.90″ | 12.00″ | 9.00″ | 5.00″ | .250″ | 5.25″ | 3.50″ | 6.88″ | 2.63″ | 6.63″ | 1.38″ | 8 |
| 4″ | 3.83″ | 14.00″ | 10.75″ | 6.19″ | .250″ | 6.50″ | 4.50″ | 7.75″ | 3.00″ | 7.50″ | 1.63″ | 8 |
| 5″ | 4.81″ | 16.50″ | 12.75″ | 7.31″ | .250″ | 8.00″ | 5.56″ | 9.25″ | 3.63″ | 9.00″ | 1.88″ | 8 |
| 6″ | 5.76″ | 19.00″ | 14.50″ | 8.50″ | .250″ | 9.25″ | 6.63″ | 11.00″ | 4.25″ | 10.75″ | 2.13″ | 8 |
| 8″ | 7.63″ | 21.75″ | 17.25″ | 10.63″ | .250″ | 12.00″ | 8.63″ | 12.75″ | 5.00″ | 12.50″ | 2.13″ | 12 |
| 10″ | 9.75″ | 26.50″ | 21.25″ | 12.75″ | .250″ | 14.75″ | 10.75″ | 16.75″ | 6.50″ | 16.50″ | 2.63″ | 12 |
| 12″ | 11.75″ | 30.00″ | 24.38″ | 15.00″ | .250″ | 17.38″ | 12.75″ | 18.50″ | 7.25″ | 18.25″ | 2.88″ | 12 |
WELDING NECK FLANGE DIMENSIONS IN MILLIMETERS
WN CLASS 150 (IN MM)
Weld neck flange dimensions class 150 (ASME B16.5) in millimeters
| Size inch |
D mm |
X mm |
G mm |
t mm |
B1 mm |
T1 mm |
A mm |
|---|---|---|---|---|---|---|---|
| 1/2 | 89 | 30.2 | 35.1 | 11.2 | 15.7 | 47.8 | 21.3 |
| 3/4 | 99 | 38.1 | 42.9 | 12.7 | 20.8 | 52.3 | 26.7 |
| 1 | 108 | 49.3 | 50.8 | 14.2 | 26.7 | 55.6 | 33.5 |
| 1¼ | 117 | 58.7 | 63.5 | 15.7 | 35.1 | 57.2 | 42.2 |
| 1½ | 127 | 65.0 | 73.2 | 17.5 | 40.9 | 62.0 | 48.3 |
| 2 | 152 | 77.7 | 91.9 | 19.1 | 52.6 | 63.5 | 60.5 |
| 2½ | 178 | 90.4 | 104.6 | 22.4 | 62.7 | 69.9 | 73.2 |
| 3 | 191 | 108.0 | 127.0 | 23.9 | 78.0 | 69.9 | 88.9 |
| 3½ | 216 | 122.2 | 139.7 | 23.9 | 90.2 | 71.4 | 101.6 |
| 4 | 229 | 134.9 | 157.2 | 23.9 | 102.4 | 76.2 | 114.3 |
| 5 | 254 | 163.6 | 185.7 | 23.9 | 128.3 | 88.9 | 141.2 |
| 6 | 279 | 192.0 | 215.9 | 25.4 | 154.2 | 88.9 | 168.4 |
| 8 | 343 | 246.1 | 269.7 | 28.4 | 202.7 | 101.6 | 218.2 |
| 10 | 406 | 304.8 | 323.9 | 30.2 | 254.5 | 101.6 | 273.1 |
| 12 | 483 | 365.3 | 381.0 | 31.8 | 304.8 | 114.3 | 323.9 |
| 14 | 533 | 400.1 | 412.8 | 35.1 | 336.6 | 127.0 | 355.6 |
| 16 | 597 | 457.2 | 469.9 | 36.6 | 387.4 | 127.0 | 406.4 |
| 18 | 635 | 505.0 | 533.4 | 39.6 | 438.2 | 139.7 | 457.2 |
| 20 | 699 | 558.8 | 584.2 | 42.9 | 489.0 | 144.5 | 508.0 |
| 24 | 813 | 663.4 | 692.2 | 47.8 | 590.6 | 152.4 | 609.6 |
| Size | Bolt Drilling | Bolting Requirements | |||||
|---|---|---|---|---|---|---|---|
| inch | Bolt circle Diameter mm |
Holes # | Holes Dia. mm | Bolt Dia. inch. | Length FF Flange |
Length RF Flange |
Length RTJ Flange |
| 1/2 | 60.5 | 4 | 15.7 | 1/2 | 50.8 | 57.2 | – |
| 3/4 | 69.9 | 4 | 15.7 | 1/2 | 50.8 | 63.5 | – |
| 1 | 79.2 | 4 | 15.7 | 1/2 | 57.2 | 63.5 | 76.2 |
| 1¼ | 88.9 | 4 | 15.7 | 1/2 | 57.2 | 69.9 | 82.6 |
| 1½ | 98.6 | 4 | 15.7 | 1/2 | 63.5 | 69.9 | 82.6 |
| 2 | 120.7 | 4 | 19.1 | 5/8 | 69.9 | 82.6 | 95.3 |
| 2½ | 139.7 | 4 | 19.1 | 5/8 | 76.2 | 88.9 | 101.6 |
| 3 | 152.4 | 4 | 19.1 | 5/8 | 76.2 | 88.9 | 101.6 |
| 3½ | 177.8 | 8 | 19.1 | 5/8 | 76.2 | 88.9 | 101.6 |
| 4 | 190.5 | 8 | 19.1 | 5/8 | 76.2 | 88.9 | 101.6 |
| 5 | 215.9 | 8 | 22.4 | 3/4 | 82.6 | 95.3 | 108.0 |
| 6 | 241.3 | 8 | 22.4 | 3/4 | 82.6 | 101.6 | 114.3 |
| 8 | 298.5 | 8 | 22.4 | 3/4 | 88.9 | 108.0 | 120.7 |
| 10 | 362.0 | 12 | 25.4 | 7/8 | 101.6 | 114.3 | 127.0 |
| 12 | 431.8 | 12 | 25.4 | 7/8 | 101.6 | 120.7 | 133.4 |
| 14 | 476.3 | 12 | 28.4 | 1 | 114.3 | 133.4 | 146.1 |
| 16 | 539.8 | 16 | 28.4 | 1 | 114.3 | 133.4 | 146.1 |
| 18 | 577.9 | 16 | 31.8 | 11/8 | 127.0 | 146.1 | 158.8 |
| 20 | 635.0 | 20 | 31.8 | 11/8 | 139.7 | 158.8 | 171.5 |
| 24 | 749.3 | 20 | 35.1 | 1¼ | 152.4 | 171.5 | 184.2 |
WN CLASS 300 (IN MM)
Weld neck flange dimensions class 300 (ASME B16.5) in millimeters
| Size inch |
D mm |
X mm |
G mm |
t mm |
B1 mm |
T1 mm |
A mm |
|---|---|---|---|---|---|---|---|
| 1/2 | 95 | 38.1 | 35.1 | 14.2 | 15.7 | 52.3 | 21.3 |
| 3/4 | 117 | 47.8 | 42.9 | 15.7 | 20.8 | 57.2 | 26.7 |
| 1 | 124 | 53.8 | 50.8 | 17.5 | 26.7 | 62.0 | 33.5 |
| 1¼ | 133 | 63.5 | 63.5 | 19.1 | 35.1 | 65.0 | 42.2 |
| 1½ | 155 | 69.9 | 73.2 | 20.6 | 40.9 | 68.3 | 48.3 |
| 2 | 165 | 84.1 | 91.9 | 22.4 | 52.6 | 69.9 | 60.5 |
| 2½ | 191 | 100.1 | 104.6 | 25.4 | 62.7 | 76.2 | 73.2 |
| 3 | 210 | 117.3 | 127.0 | 28.4 | 78.0 | 79.2 | 88.9 |
| 3½ | 229 | 133.4 | 139.7 | 30.2 | 90.2 | 81.0 | 101.6 |
| 4 | 254 | 146.1 | 157.2 | 31.8 | 102.4 | 85.9 | 114.3 |
| 5 | 279 | 177.8 | 185.7 | 35.1 | 128.3 | 98.6 | 141.2 |
| 6 | 318 | 206.2 | 215.9 | 36.6 | 154.2 | 98.6 | 168.4 |
| 8 | 381 | 260.4 | 269.7 | 41.1 | 202.7 | 111.3 | 219.2 |
| 10 | 445 | 320.5 | 323.9 | 47.8 | 254.5 | 117.3 | 273.1 |
| 12 | 521 | 374.7 | 381.0 | 50.8 | 304.8 | 130.0 | 323.9 |
| 14 | 584 | 425.5 | 412.8 | 63.8 | 336.6 | 142.7 | 355.6 |
| 16 | 648 | 482.6 | 469.9 | 57.2 | 387.4 | 146.1 | 406.4 |
| 18 | 711 | 533.4 | 533.4 | 60.5 | 438.2 | 158.8 | 457.2 |
| 20 | 775 | 587.2 | 584.2 | 63.5 | 489.0 | 162.1 | 508.0 |
| 24 | 914 | 701.5 | 692.2 | 69.9 | 590.6 | 168.1 | 609.6 |
| Size | Bolt Drilling | Bolting Requirements | |||||
|---|---|---|---|---|---|---|---|
| inch | Bolt circle Diameter mm |
Holes # | Holes Dia. mm | Bolt Dia. inch. | Length FF Flange |
Length RF Flange |
Length RTJ Flange |
| 1/2 | 66.5 | 4 | 15.7 | 1/2 | 57.2 | 63.5 | 76.2 |
| 3/4 | 82.6 | 4 | 19.1 | 5/8 | 63.5 | 76.2 | 88.9 |
| 1 | 88.9 | 4 | 19.1 | 5/8 | 63.5 | 76.2 | 88.9 |
| 1¼ | 98.6 | 4 | 19.1 | 5/8 | 69.9 | 82.6 | 95.3 |
| 1½ | 114.3 | 4 | 22.4 | 3/4 | 76.2 | 88.9 | 101.6 |
| 2 | 127.0 | 8 | 19.1 | 5/8 | 76.2 | 88.9 | 101.6 |
| 2½ | 149.4 | 8 | 22.4 | 3/4 | 82.6 | 101.6 | 114.3 |
| 3 | 168.1 | 8 | 22.4 | 3/4 | 88.9 | 108.0 | 120.7 |
| 3½ | 184.2 | 8 | 22.4 | 3/4 | 95.3 | 108.0 | 127.0 |
| 4 | 200.2 | 8 | 22.4 | 3/4 | 95.3 | 114.3 | 127.0 |
| 5 | 235.0 | 8 | 22.4 | 3/4 | 108.0 | 120.7 | 133.4 |
| 6 | 269.7 | 12 | 22.4 | 3/4 | 108.0 | 120.7 | 139.7 |
| 8 | 330.2 | 12 | 25.4 | 7/8 | 120.7 | 139.7 | 152.4 |
| 10 | 387.4 | 16 | 28.4 | 1 | 139.7 | 158.8 | 171.5 |
| 12 | 450.9 | 16 | 31.8 | 11/8 | 146.1 | 171.5 | 184.2 |
| 14 | 514.4 | 20 | 31.8 | 11/8 | 158.8 | 177.8 | 190.5 |
| 16 | 571.5 | 20 | 35.1 | 1¼ | 165.1 | 190.5 | 203.2 |
| 18 | 628.7 | 24 | 35.1 | 1¼ | 171.5 | 196.9 | 209.6 |
| 20 | 685.8 | 24 | 35.1 | 1¼ | 184.2 | 203.2 | 222.3 |
| 24 | 812.8 | 24 | 41.1 | 1½ | 203.2 | 228.6 | 254.0 |
WN CLASS 600 (IN MM)
Weld neck flange dimensions class 300 (ASME B16.5) in millimeters
| Size inch |
D mm |
X mm |
G mm |
t mm |
B1 mm |
T1 mm |
A mm |
|---|---|---|---|---|---|---|---|
| 1/2 | 95 | 38.1 | 35.1 | 14.2 | B36.10/.19 | 52.3 | 21.3 |
| 3/4 | 117 | 47.8 | 42.9 | 15.7 | B36.10/.19 | 57.2 | 26.7 |
| 1 | 124 | 53.8 | 50.8 | 17.5 | B36.10/.19 | 62.0 | 33.5 |
| 1¼ | 133 | 63.5 | 63.5 | 20.6 | B36.10/.19 | 66.5 | 42.2 |
| 1½ | 155 | 69.9 | 73.2 | 22.4 | B36.10/.19 | 69.9 | 48.3 |
| 2 | 165 | 84.1 | 91.9 | 25.4 | B36.10/.19 | 73.2 | 60.5 |
| 2½ | 191 | 100.1 | 104.6 | 28.4 | B36.10/.19 | 79.2 | 73.2 |
| 3 | 210 | 117.3 | 127.0 | 31.8 | B36.10/.19 | 82.6 | 88.9 |
| 3½ | 229 | 133.4 | 139.7 | 35.1 | B36.10/.19 | 85.9 | 101.6 |
| 4 | 273 | 152.4 | 157.2 | 38.1 | B36.10/.19 | 101.6 | 114.3 |
| 5 | 330 | 189.0 | 185.7 | 44.5 | B36.10/.19 | 114.3 | 141.2 |
| 6 | 356 | 222.3 | 215.9 | 47.8 | B36.10/.19 | 117.3 | 168.4 |
| 8 | 419 | 273.1 | 269.7 | 55.6 | B36.10/.19 | 133.4 | 219.2 |
| 10 | 508 | 342.9 | 323.9 | 63.5 | B36.10/.19 | 152.4 | 273.1 |
| 12 | 559 | 400.1 | 381.0 | 66.5 | B36.10/.19 | 155.4 | 323.9 |
| 14 | 603 | 431.8 | 412.8 | 69.9 | B36.10/.19 | 165.1 | 355.6 |
| 16 | 686 | 495.3 | 469.9 | 76.2 | B36.10/.19 | 177.8 | 406.4 |
| 18 | 743 | 546.1 | 533.4 | 82.6 | B36.10/.19 | 184.2 | 457.2 |
| 20 | 813 | 609.6 | 584.2 | 88.9 | B36.10/.19 | 190.5 | 508.0 |
| 24 | 940 | 717.6 | 692.2 | 101.6 | B36.10/.19 | 203.2 | 609.6 |
| Size | Bolt Drilling | Bolting Requirements | |||||
|---|---|---|---|---|---|---|---|
| inch | Bolt circle Diameter mm |
Holes # | Holes Dia. mm | Bolt Dia. inch. | Length FF Flange |
Length RF Flange |
Length RTJ Flange |
| 1/2 | 66.5 | 4 | 15.7 | 1/2 | 76.2 | 69.9 | 76.2 |
| 3/4 | 82.6 | 4 | 19.1 | 5/8 | 88.9 | 82.6 | 88.9 |
| 1 | 88.9 | 4 | 19.1 | 5/8 | 88.9 | 82.6 | 88.9 |
| 1¼ | 98.6 | 4 | 19.1 | 5/8 | 95.3 | 88.9 | 95.3 |
| 1½ | 114.3 | 4 | 22.4 | 3/4 | 108.0 | 101.6 | 108.0 |
| 2 | 127.0 | 8 | 19.1 | 5/8 | 108.0 | 101.6 | 108.0 |
| 2½ | 149.4 | 8 | 22.4 | 3/4 | 120.7 | 114.3 | 120.7 |
| 3 | 168.1 | 8 | 22.4 | 3/4 | 127.0 | 120.7 | 127.0 |
| 3½ | 184.2 | 8 | 25.4 | 7/8 | 139.7 | 133.4 | 139.7 |
| 4 | 215.9 | 8 | 25.4 | 7/8 | 146.1 | 139.7 | 146.1 |
| 5 | 266.7 | 8 | 28.4 | 1 | 165.1 | 158.8 | 165.1 |
| 6 | 292.1 | 12 | 28.4 | 1 | 171.5 | 165.1 | 171.5 |
| 8 | 349.3 | 12 | 31.8 | 11/8 | 190.5 | 184.2 | 196.9 |
| 10 | 431.8 | 16 | 35.1 | 1¼ | 215.9 | 209.6 | 215.9 |
| 12 | 489.0 | 20 | 35.1 | 1¼ | 222.3 | 215.9 | 222.3 |
| 14 | 527.1 | 20 | 38.1 | 13/8 | 235.0 | 228.6 | 235.0 |
| 16 | 603.3 | 20 | 41.1 | 1½ | 254.0 | 247.7 | 254.0 |
| 18 | 654.1 | 20 | 44.5 | 15/8 | 273.1 | 266.7 | 273.1 |
| 20 | 723.9 | 24 | 44.5 | 15/8 | 285.8 | 279.4 | 292.1 |
| 24 | 838.2 | 24 | 50.8 | 17/8 | 330.2 | 323.9 | 336.6 |
WN CLASS 900 (IN MM)
Weld neck flange dimensions class 300 (ASME B16.5) in millimeters
| Size inch |
D mm |
X mm |
G mm |
t mm |
B1 mm |
T1 mm |
A mm |
|---|---|---|---|---|---|---|---|
| 1/2 | 121 | 38.1 | 35.1 | 22.4 | B36.10/.19 | 60.5 | 21.3 |
| 3/4 | 130 | 44.5 | 42.9 | 25.4 | B36.10/.19 | 69.9 | 26.7 |
| 1 | 149 | 52.3 | 50.8 | 28.4 | B36.10/.19 | 73.2 | 33.5 |
| 1¼ | 159 | 63.5 | 63.5 | 28.4 | B36.10/.19 | 73.2 | 42.2 |
| 1½ | 178 | 69.9 | 73.2 | 31.8 | B36.10/.19 | 82.6 | 48.3 |
| 2 | 216 | 104.6 | 91.9 | 38.1 | B36.10/.19 | 101.6 | 60.5 |
| 2½ | 244 | 124.0 | 104.6 | 41.1 | B36.10/.19 | 104.6 | 73.2 |
| 3 | 241 | 127.0 | 127.0 | 38.1 | B36.10/.19 | 101.6 | 88.9 |
| 4 | 292 | 158.8 | 157.2 | 44.5 | B36.10/.19 | 114.3 | 114.3 |
| 5 | 349 | 190.5 | 185.7 | 50.8 | B36.10/.19 | 127.0 | 141.2 |
| 6 | 381 | 235.0 | 215.9 | 55.6 | B36.10/.19 | 139.7 | 168.4 |
| 8 | 470 | 298.5 | 269.7 | 63.5 | B36.10/.19 | 162.1 | 219.2 |
| 10 | 546 | 368.3 | 323.9 | 69.9 | B36.10/.19 | 184.2 | 273.1 |
| 12 | 610 | 419.1 | 381.0 | 79.2 | B36.10/.19 | 200.2 | 323.9 |
| 14 | 641 | 450.9 | 412.8 | 85.9 | B36.10/.19 | 212.9 | 355.6 |
| 16 | 705 | 508.0 | 469.9 | 88.9 | B36.10/.19 | 215.9 | 406.4 |
| 18 | 787 | 565.2 | 533.4 | 101.6 | B36.10/.19 | 228.6 | 457.2 |
| 20 | 857 | 622.3 | 584.2 | 108.0 | B36.10/.19 | 247.7 | 508.0 |
| 24 | 1041 | 749.3 | 692.2 | 139.7 | B36.10/.19 | 292.1 | 609.6 |
| Size | Bolt Drilling | Bolting Requirements | |||||
|---|---|---|---|---|---|---|---|
| inch | Bolt circle Diameter mm |
Holes # | Holes Dia. mm | Bolt Dia. inch. | Length FF Flange |
Length RF Flange |
Length RTJ Flange |
| 1/2 | 82.6 | 4 | 22.4 | 3/4 | 108.0 | 101.6 | 108.0 |
| 3/4 | 88.9 | 4 | 22.4 | 3/4 | 114.3 | 108.0 | 114.3 |
| 1 | 101.6 | 4 | 25.4 | 7/8 | 127.0 | 120.7 | 127.0 |
| 1¼ | 111.3 | 4 | 25.4 | 7/8 | 127.0 | 120.7 | 127.0 |
| 1½ | 124.0 | 4 | 28.4 | 1 | 139.7 | 133.4 | 139.7 |
| 2 | 165.1 | 8 | 25.4 | 7/8 | 146.1 | 139.7 | 146.1 |
| 2½ | 190.5 | 8 | 28.4 | 1 | 158.8 | 152.4 | 158.8 |
| 3 | 190.5 | 8 | 25.4 | 7/8 | 146.1 | 139.7 | 146.1 |
| 4 | 235.0 | 8 | 31.8 | 11/8 | 171.5 | 165.1 | 171.5 |
| 5 | 279.4 | 8 | 35.1 | 1¼ | 190.5 | 184.2 | 190.5 |
| 6 | 317.5 | 12 | 31.8 | 11/8 | 190.5 | 184.2 | 196.9 |
| 8 | 393.7 | 12 | 38.1 | 13/8 | 222.3 | 215.9 | 222.3 |
| 10 | 469.9 | 16 | 38.1 | 13/8 | 235.0 | 228.6 | 235.0 |
| 12 | 533.4 | 20 | 38.1 | 13/8 | 254.0 | 247.7 | 254.0 |
| 14 | 558.8 | 20 | 41.1 | 1½ | 273.1 | 266.7 | 292.1 |
| 16 | 616.0 | 20 | 44.5 | 15/8 | 285.8 | 279.4 | 298.5 |
| 18 | 685.8 | 20 | 50.8 | 17/8 | 323.9 | 317.5 | 333.6 |
| 20 | 749.3 | 20 | 53.8 | 2 | 349.3 | 342.9 | 362.0 |
| 24 | 901.7 | 20 | 66.5 | 1½ | 438.2 | 431.8 | 457.2 |
DIMENSIONAL TOLERANCE WELDING NECK FLANGE
| Certificate | Plate thickness in mm | Width in mm | Length in mm | |
| Outside Diameter | When O is 24″ or less. When O is over 24″. | ±0.06″ ±0.12″ | ±1.6 mm | ±3.2 mm |
| Diameter of Contact Face | 0.06″ (1.6 mm) raised face. 0.25″ (6.4 mm) raised face. | ±0.03″ ±0.02″ | ±0.8 mm | ±0.5mm |
| Diameter of Hub at Point of Welding | NPS 5 and smaller. NPS 6 and larger. | +0.09″, -0.03″ +0.16″, -0.03″ | +2.4 mm, -0.8mm | +4.0 mm, -0.8 mm |
| Inside Diameter | NPS 10, 12, 18, 20 and larger. | +0.03″ +0.06″ +0.12″, -0.06″ | +0.8 mm +1.6 mm | +3.2 mm, -1.6 mm |
| Diameter of Hub at Base | Hub Base is 24″or less. Hub Base is over 24″. | +0.06″ +0.12″ | +1.6 mm | +3.2 mm |
| Thickness | NPS 18 and smaller. NPS 20 and larger. | +0.12″ +0.19″ | +3.2 mm | +4.8 mm |
| Drilling and Facings | Bolt circle diameter Bolt Hole Spacing | ±0.06″ ±0.03″ | ±1.6 mm | ±0.8 mm |
| Eccentricity of Bolt Circle and Facing | NPS 2 1/2 and smaller. NPS 3 and larger. | ±0.03″ ±0.06″ | ±0.8 mm | ±1.6 mm |
| Length Through Hub | NPS 10 and smaller. NPS 12 and larger. | ±0.06″ ±0.12″ | ±1.6 mm | ±3.2 mm |
EU Origin
Factory Prices
Top Quality
2 Responses
There are mistake on the drawings and tables for metric units for threaded and WN flanges rated class 600 & 900 (other types were not checked).
Note that the RF (raised face dimension is not always 1.6 mm. For these flanges the height of raised face is 6.4 mm (0.25″). Also that height is not included in the overall length (or height) of the flange.
REQUEST FOR YOUR REQUIREMENT FOR STAINLESS STEEL, CARBON STEEL, ALLOY STEEL, COPPER ALLOYS & EXOTIC NICKEL ALLOYS IN FORM OF PIPE, TUBE, SHEET, PLATES, FITTINGS & FLANGES We STELCO INOX INC are Fastest growing International Suppliers & Exporters of Industrial Raw material to world renowned companies in India & abroad, providing them with world class quality material and service. Our products are supplied & accepted by our clients in various sphere of industries ranging from basic industries such as Paper, Textile, Sugar, Dairy, Cement, Engineering to more complex such as Petroleum, Chemicals, Power, Offshore, Onshore & Nuclear Industries.
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