Die DREIKEGEL-BOHRSPITZEN bestehen aus drei mit Stahlzähnen versehenen Kegelrollenlagern; Rolle oder Kugel aus Wolframcarbid. Die handelsüblichste Ausführung besteht aus kurzen oder langen Stahlzähnen für weiche oder mittelweiche Böden, während die Dreikegel-Bohrspitzen aus Wolframcarbid für halbharte oder steinharte Böden geeignet sind. Die Dreikegel-Bohrspitzen können sowohl neu als auch gebraucht gekauft werden.
Dreikegel-Bohrspitzen
| BOHRMEISSEL DURCHMESSER | WEICHBÖDEN | MITTELWEICHE BÖDEN | HARTE BÖDEN | GEWINDE-TYP | Kg | ||||
| zoll | mm | VERZAHNUNG | |||||||
| 2 7/8 | 73,00 | - | - | NC-2 | NC-1 | NC-1T | NC-1H | 4 THD N-ROD | 1,4 |
| 2 15/16 | 74,60 | - | - | NC-2 | NC-1 | NC-1T | NC-1H | 4 THD N-ROD | 1,4 |
| 3 1/8 | 79,40 | - | - | NC-2 | NC-1 | NC-1T | NC-1H | 4 THD N-ROD | 1,8 |
| 3 | 76,20 | - | - | NC-2 | NC-1 | NC-1T | NC-1H | 4 THD N-ROD | 1,8 |
| 3 1/4 | 82,60 | - | - | NC-2 | NC-1 | NC-1T | NC-1H | 4 THD N-ROD | 1,8 |
| 3 1/2 | 88,90 | - | - | NC-2 | NC-1 | NC-1T | NC-1H | 4 THD N-ROD | 1,8 |
| 3 5/8 | 92,10 | - | NC-3 | NC-2 | NC-1 | NC-1T | NC-1H | 2 3/8 API REG. | 0,3 |
| 3 3/4 | 95,30 | - | NC-3 | NC-2 | NC-1 | NC-1T | NC-1H | 2 3/8 API REG. | 2,3 |
| 3 7/8 | 98,40 | - | NC-3 | NC-2 | NC-1 | NC-1T | NC-1H | 2 3/8 API REG. | 2,7 |
| 4 | 101,60 | - | NC-3 | NC-2 | NC-1 | NC-1T | NC-1H | 2 3/8 API REG. | 3,2 |
| 4 1/4 | 108,00 | - | NC-3 | NC-2 | NC-1 | NC-1T | NC-1H | 2 3/8 API REG. | 4,1 |
| 4 1/2 | 114,30 | NC-4 | NC-3 | NC-2 | NC-1 | NC-1T | NC-1H | 2 3/8 API REG. | 4,5 |
| 4 5/8 | 117,50 | NC-4 | NC-3 | NC-2 | NC-1 | NC-1T | NC-1H | 2 3/8 API REG. | 5 |
| 4 3/4 | 120,70 | - | NC-3 | NC-2 | NC-1 | NC-1T | NC-1H | 2 7/8 API REG. | 5,9 |
| 4 7/8 | 123,80 | - | NC-3 | NC-2 | NC-1 | NC-1T | NC-1H | 2 7/8 API REG. | 6,4 |
| 5 | 127,00 | - | NC-3 | NC-2 | NC-1 | NC-1T | NC-1H | 2 7/8 API REG. | 6,8 |
| 5 1/8 | 130,20 | - | NC-3 | NC-2 | NC-1 | NC-1T | NC-1H | 2 7/8 API REG. | 7,3 |
| 5 5/8 | 149,90 | NC-4 | NC-3 | NC-2 | NC-1 | NC-1T | NC-1H | 3 1/2 API REG. | 10 |
| 5 7/8 | 149,20 | NC-4 | NC-3 | NC-2 | NC-1 | NC-1T | NC-1H | 3 1/2 API REG. | 10,5 |
| 6 | 152,40 | - | NC-3 | NC-2 | NC-1 | NC-1T | NC-1H | 3 1/2 API REG. | 10,5 |
| 6 1/8 | 155,60 | - | NC-3 | NC-2 | NC-1 | NC-1T | NC-1H | 3 1/2 API REG. | 10,9 |
| 6 1/4 | 158,80 | NC-4 | NC-3 | NC-2 | NC-1 | NC-1T | NC-1H | 3 1/2 API REG. | 11,8 |
| 6 3/4 | 171,50 | NC-4 | NC-3 | NC-2 | NC-1 | NC-1T | NC-1H | 3 1/2 API REG. | 14,5 |
| 7 3/8 | 187,33 | - | NC-3 | NC-2 | NC-1 | NC-1T | NC-1H | 3 1/2 API REG. | 26,3 |
| 7 5/8 | 193,68 | - | NC-3 | NC-2 | NC-1 | NC-1T | NC-1H | 4 1/2 API REG. | 281 |
| 8 1/2 | 215,90 | - | NC-3 | NC-2 | NC-1 | NC-1T | NC-1H | 4 1/2 API REG. | 34 |
| 9 | 228,60 | - | NC-3 | NC-2 | NC-1 | NC-1T | NC-1H | 4 1/2 API REG. | 36/52 |