Find Lightweight Overbore Flanges at API International, Inc. These Overbore Flanges are class #150 bolt hole pattern. Contact our sales team if you do not see the Overbore Flanges required for your project! We can add an overbore to any standard flange utilizing our machine shop.
Downloads:
| API Part Number | I.D. | O.D. | THK | B.H.C. | B.H. Dia. | # of Bolts | Material |
| PFHOB1400-1475 | 14.75 | 21.00 | .50 | 18.75 | 1.125 | 12 | C207-13 |
| PFHOB1600-1675 | 16.75 | 23.50 | .50 | 21.25 | 1.125 | 16 | C207-13 |
| PFHOB1800-1875 | 18.75 | 25.00 | .50 | 22.75 | 1.250 | 16 | C207-13 |
| PFHOB2200-2275 | 20.75 | 29.50 | .50 | 27.25 | 1.375 | 20 | C207-13 |
