Weld Neck Flange Dimensions (Cl. 150/300/900/1500/2500)
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 |
