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See our Butterfly Valve Flat 520 Flanges. These 520 Butterfly Valve Flat Flanges are available in ASTM A105 Mild Steel.
Downloads:
| API Part Number | Nominal Size | O.D. | Serrations Dia. | B.H.C. Dia. | I.D. | # of Bolts | B.H. Dia. | THK |
| 520693000 | 3 | 7.5 | 6.000 | 3.031 | 4 | .750 | .375 | |
| 520694000 | 4 | 9.0 | 9.000 | 4.031 | 8 | .750 | .500 | |
| 520696000 | 6 | 11.0 | 9.500 | 6.063 | 8 | .875 | .500 |
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