用於鍵槽加工用
| 記號 | 外徑 | 刃長 | 全長 | 角徑 |
| GKKEY3 | 3 | 6 | 50 | 6 |
| GKKEY4 | 4 | 7 | 60 | 8 |
| GKKEY5 | 5 | 8 | 60 | 8 |
| GKKEY6 | 6 | 10 | 60 | 8 |
| GKKEY7 | 7 | 10 | 60 | 10 |
| GKKEY8 | 8 | 12 | 60 | 10 |
| GKKEY9 | 9 | 12 | 70 | 12 |
| GKKEY10 | 10 | 14 | 70 | 12 |
| GKKEY11 | 11 | 16 | 75 | 12 |
| GKKEY12 | 12 | 16 | 75 | 12 |
| GKKEY13 | 13 | 16 | 80 | 16 |
| GKKEY14 | 14 | 16 | 80 | 16 |
| GKKEY15 | 15 | 16 | 80 | 16 |
| GKKEY16 | 16 | 18 | 80 | 16 |
| GKKEY18 | 18 | 18 | 85 | 20 |
| GKKEY20 | 20 | 20 | 85 | 20 |
