
| Single Tube System | Double Tube System |
| Single Tube System (STS) – | Double Tube System (DTS) - |
| Cooling fluid is induced through the gap between | Cooling fluid is induced between the coaxial |
| the drill and the hole. Conveying the chips through | tubes, conveying the chips through the inner tube |
| the tube requires the use of dedicated machines. | and can be applied on standard machines. |
| S D D | - E | C | XX XXX.XXX XX |
| Hole Diameter | |||
| I - Insert | |||
| A - Adjustable Insert | Chipbreaker | ||
| C - Cartridge | (letters) | ||
| F - Fast Feed | -or- Insert | ||
| 0 - Brazed, 1 tip, 1 thread start | Chamfer Angle | ||
| 1 - Brazed, 1 tip | (for boring) | ||
| 2 - Brazed, 2 tips | (numbers) | ||
| 3 - Brazed, 3 tips | |||
| E - External Thread | |||
| I - Internal Thread | |||
| D - Drill | P - Steel | ||
| C - Counterbore with Through Hole | M - Stainless |
T - Counterbore without Through Hole K - Cast Iron TR - Trepanning N - Aluminum
S - Single Tube D - Double Tube
D - Deep Drilling/Counterbore I - Inch Deep Drilling/Counterbore S - Special Deep Drilling/Counterbore 0 - Uncoated 1 - TiAlN Coating Z - TiCrAlN Coating