Blind Flange Dimensions
| NPS | O | tf |
| 1/2 | 5.25 | 1.19 |
| 3/4 | 5.50 | 1.25 |
| 1 | 6.25 | 1.38 |
| 1-1/4 | 7.25 | 1.50 |
| 1-1/2 | 8.00 | 1.75 |
| 2 | 9.25 | 2.00 |
| 2-1/2 | 10.50 | 2.25 |
| 3 | 12.00 | 2.62 |
| 4 | 14.00 | 3.00 |
| 5 | 16.50 | 3.62 |
| 6 | 19.00 | 4.25 |
| 8 | 21.75 | 5.00 |
| 10 | 26.50 | 6.50 |
| 12 | 30.00 | 7.25 |
| NPS | O | tf |
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Templates for drilling of bolt holes
Flange Drilling Template
| NPS | BCD | BHD | BOLTS | BD |
| 1/2 | 3.50 | 7/8 | 4 | 3/4 |
| 3/4 | 3.75 | 7/8 | 4 | 3/4 |
| 1 | 4.25 | 1 | 4 | 7/8 |
| 1-1/4 | 5.12 | 1-1/8 | 4 | 1 |
| 1-1/2 | 5.75 | 1-1/4 | 4 | 1-1/8 |
| 2 | 6.75 | 1-1/8 | 8 | 1 |
| 2-1/2 | 7.75 | 1-1/4 | 8 | 1-1/8 |
| 3 | 9.00 | 1-3/8 | 8 | 1-1/4 |
| 4 | 10.75 | 1-5/8 | 8 | 1-1/2 |
| 5 | 12.75 | 1-7/8 | 8 | 1-3/4 |
| 6 | 14.50 | 2-1/8 | 8 | 2 |
| 8 | 17.25 | 2-1/8 | 12 | 2 |
| 10 | 21.25 | 2-5/8 | 12 | 2-1/2 |
| 12 | 24.38 | 2-7/8 | 12 | 2-3/4 |
| NPS | BCD | BHD | BOLTS | BD |
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Flange Drilling Template
| NPS | SBL RFY | SBL RJ | MBL RF |
| 1/2 | 4.75 | 4.50 | 4.75 |
| 3/4 | 5.00 | 4.75 | 5.00 |
| 1 | 5.50 | 5.25 | 5.50 |
| 1-1/4 | 6.00 | 5.75 | 6.00 |
| 1-1/2 | 6.75 | 6.50 | 6.75 |
| 2 | 7.00 | 6.75 | 7.00 |
| 2-1/2 | 7.75 | 7.50 | 8.00 |
| 3 | 8.75 | 8.50 | 9.00 |
| 4 | 10.00 | 9.75 | 10.25 |
| 5 | 11.75 | 11.50 | 12.25 |
| 6 | 13.50 | 13.25 | 14.00 |
| 8 | 15.00 | 14.75 | 15.50 |
| 10 | 19.25 | 19.00 | 20.00 |
| 12 | 21.25 | 21.00 | 22.00 |
| NPS | SBL RFY | SBL RJ | MBL RF |
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General Notes
Dimensions are in millimeters, except for diameters of bolts and bolt holes, which are in inch units.
