Weld Neck Flange Dimensions
| NPS | O | tf | X |
| 1/2 | 3.75 | 0.50 | 1.50 |
| 3/4 | 4.62 | 0.56 | 1.88 |
| 1 | 4.88 | 0.62 | 2.12 |
| 1-1/4 | 5.25 | 0.69 | 2.50 |
| 1-1/2 | 6.12 | 0.75 | 2.75 |
| 2 | 6.50 | 0.81 | 3.31 |
| 2-1/2 | 7.50 | 0.94 | 3.94 |
| 3 | 8.25 | 1.06 | 4.62 |
| 3-1/2 | 9.00 | 1.12 | 5.25 |
| 4 | 10.00 | 1.19 | 5.75 |
| 5 | 11.00 | 1.31 | 7.00 |
| 6 | 12.5O | 1.38 | 8.12 |
| 8 | 15.00 | 1.56 | 10.25 |
| 10 | 17.50 | 1.81 | 12.62 |
| 12 | 20.50 | 1.94 | 14.75 |
| NPS | O | tf | X |
| 14 | 23.00 | 2.06 | 16.75 |
| 16 | 25.50 | 2.19 | 19.00 |
| 18 | 28.00 | 2.31 | 21.00 |
| 20 | 30.50 | 2.44 | 23.12 |
| 24 | 36.00 | 2.69 | 27.62 |
[google-square-ad]
Weld Neck Flange Dimensions
| NPS | A | Y | B |
| 1/2 | 0.84 | 2.00 | 0.62 |
| 3/4 | 1.05 | 2.19 | 0.82 |
| 1 | 1.32 | 2.38 | 1.05 |
| 1-1/4 | 1.66 | 2.50 | 1.38 |
| 1-1/2 | 1.90 | 2.63 | 1.61 |
| 2 | 2.38 | 2.69 | 2.07 |
| 2-1/2 | 2.88 | 2.94 | 2.47 |
| 3 | 3.50 | 3.06 | 3.07 |
| 3-1/2 | 4.00 | 3.13 | 3.55 |
| 4 | 4.50 | 3.32 | 4.03 |
| 5 | 5.56 | 3.82 | 5.05 |
| 6 | 6.63 | 3.82 | 6.07 |
| 8 | 8.63 | 4.32 | 7.98 |
| 10 | 10.75 | 4.56 | 10.02 |
| 12 | 12.75 | 5.06 | 12.00 |
| NPS | A | Y | B |
| 14 | 14.00 | 5.56 | BY P |
| 16 | 16.00 | 5.69 | BY P |
| 18 | 18.00 | 6.19 | BY P |
| 20 | 20.00 | 6.32 | BY P |
| 24 | 24.00 | 6.56 | BY P |
[google-square-ad]
Templates for drilling of bolt holes
Flange Drilling Template
| NPS | BCD | BHD | BOLTS | BD |
| 1/2 | 2.62 | 5/8 | 4 | 1/2 |
| 3/4 | 3.25 | 3/4 | 4 | 5/8 |
| 1 | 3.50 | 3/4 | 4 | 5/8 |
| 1-1/4 | 3.88 | 3/4 | 4 | 5/8 |
| 1-1/2 | 4.50 | 7/8 | 4 | 3/4 |
| 2 | 5.00 | 3/4 | 8 | 5/8 |
| 2-1/2 | 5.88 | 7/8 | 8 | 3/4 |
| 3 | 6.62 | 7/8 | 8 | 3/4 |
| 3-1/2 | 7.25 | 7/8 | 8 | 3/4 |
| 4 | 7.88 | 7/8 | 8 | 3/4 |
| 5 | 9.25 | 7/8 | 8 | 3/4 |
| 6 | 10.62 | 7/8 | 12 | 3/4 |
| 8 | 13.00 | 1 | 12 | 7/8 |
| 10 | 15.25 | 1-1/8 | 16 | 1 |
| 12 | 17.75 | 1-1/4 | 16 | 1-1/8 |
| NPS | BCD | BHD | BOLTS | BD |
| 14 | 20.25 | 1-1/4 | 20 | 1-1/8 |
| 16 | 22.50 | 1-3/8 | 20 | 1-1/4 |
| 18 | 24.75 | 1-3/8 | 24 | 1-1/4 |
| 20 | 27.00 | 1-3/8 | 24 | 1-1/4 |
| 24 | 32.00 | 1-5/8 | 24 | 1-1/2 |
[google-square-ad]
Flange Drilling Template
| NPS | SBL RFY | SBL RJ | MBL RF |
| 1/2 | 2.50 | 3.00 | 2.25 |
| 3/4 | 3.00 | 3.50 | 2.50 |
| 1 | 3.00 | 3.50 | 2.50 |
| 1-1/4 | 3.25 | 3.75 | 2.75 |
| 1-1/2 | 3.50 | 4.00 | 3.00 |
| 2 | 3.50 | 4.00 | 3.00 |
| 2-1/2 | 4.00 | 4.50 | 3.25 |
| 3 | 4.25 | 4.75 | 3.50 |
| 3-1/2 | 4.25 | 5.00 | 3.75 |
| 4 | 4.50 | 5.00 | 3.75 |
| 5 | 4.75 | 5.25 | 4.25 |
| 6 | 4.75 | 5.50 | 4.25 |
| 8 | 5.50 | 6.00 | 4.75 |
| 10 | 6.25 | 6.75 | 5.50 |
| 12 | 6.75 | 7.25 | 5.75 |
| NPS | SBL RFY | SBL RJ | MBL RF |
| 14 | 7.00 | 7.50 | 6.25 |
| 16 | 7.50 | 8.00 | 6.50 |
| 18 | 7.75 | 8.25 | 6.75 |
| 20 | 8.00 | 8.75 | 7.25 |
| 24 | 9.00 | 10.00 | 8.00 |
[google-square-ad]
General Notes
Dimensions are in millimeters, except for diameters of bolts and bolt holes, which are in inch units.
