- Features
| D57 Geometry - The stable one |
| For average machining conditions |
| Can be used universally |
| One wave on the flank face |
| +/-0.025 mm cutting edge tolerance |
| +/-0.025 mm inscribed circle tolerance |
| +/-0.13 mm thickness tolerance |
| 1.6 mm width face chamfer |
| 4 cutting edges |
| 40 to 60 deg double countersink hole |
| 90 deg approach |