KAT DRILLING
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Extension rods are made by hollow drill steels; there are two shapes of extension rods, round type and hexagonal type. This hollow hole are usually named flushing hole, used for transmitting water or air during drilling. And the threads can be used for connecting couplings, shanks, couplings or bits.
Usually for extension rods, there are R22, R25, R28, R32, R38, T38, T45, T51, ST58, T60 threads, and different lengths of rods are available from 600mm to 6400mm usually.
| ROD CROSS SECTION | LENGTH (L) | THREAD | ||
|---|---|---|---|---|
| mm | FT | Left | Right | |
| R22 - R22 - HEX 22 (7/8" ROPE THREAD 22mm X 7/8" HEX 22mm) | ||||
| HEX 22 | 610 | 2' | R22 | R22 |
| HEX 22 | 915 | 3' | R22 | R22 |
| HEX 22 | 1220 | 4' | R22 | R22 |
| HEX 22 | 1525 | 5' | R22 | R22 |
| HEX 22 | 1830 | 6' | R22 | R22 |
| R25 - R25 - HEX 25 (1" ROPE THREAD 25mm X 1" HEX 25mm) | ||||
| HEX 25 | 610 | 2' | R25 | R25 |
| HEX 25 | 915 | 3' | R25 | R25 |
| HEX 25 | 1000 | 3' 3" | R25 | R25 |
| HEX 25 | 1220 | 4' | R25 | R25 |
| HEX 25 | 1500 | 4' 11" | R25 | R25 |
| HEX 25 | 1525 | 5' | R25 | R25 |
| HEX 25 | 1830 | 6' | R25 | R25 |
| HEX 25 | 2100 | 6' 10-1/2" | R25 | R25 |
| HEX 25 | 2435 | 8' | R25 | R25 |
| HEX 25 | 3050 | 10' | R25 | R25 |
| HEX 25 | 3660 | 12' | R25 | R25 |
| HEX 25 | 4305 | 14' 1-1/2" | R25 | R25 |
| R28 - R28 - HEX 28 (1-1/8" ROPE THREAD 28mm X 1-1/8" HEX 28mm) | ||||
| HEX 28 | 610 | 2' | R28 | R28 |
| HEX 28 | 915 | 3' | R28 | R28 |
| HEX 28 | 1220 | 4' | R28 | R28 |
| HEX 28 | 1525 | 5' | R28 | R28 |
| HEX 28 | 1830 | 6' | R28 | R28 |
| HEX 28 | 2435 | 8' | R28 | R28 |
| HEX 28 | 3050 | 10' | R28 | R28 |
| HEX 28 | 3660 | 12' | R28 | R28 |
