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 is usually named a flushing hole, used for transmitting water or air during drilling. The threads are designed for connecting couplings, shanks, or bits.
Common thread types include R22, R25, SR25, R28, SR28, R32, SR32, SR35, SR38, R38, T38, T45, T51, ST58, and T60. Available lengths range from 600mm to 6400mm.
| R22 - R22 HEX 22 (7/8" ROPE THREAD) | ||||
| ROD CROSS SECTION | LENGTH (L) | THREAD | ||
| HEX 22 | 610 mm | 2' | R22 | R22 |
| HEX 22 | 1830 mm | 6' | R22 | R22 |
| R25 - R25 HEX 25 (1" ROPE THREAD) | ||||
| ROD CROSS SECTION | LENGTH (L) | THREAD | ||
| HEX 25 | 1000 mm | 3' 3" | R25 | R25 |
| HEX 25 | 3050 mm | 10' | R25 | R25 |
| HEX 25 | 4305 mm | 14' 1-1/2" | R25 | R25 |
| R28 - R28 HEX 28 (1-1/8" ROPE THREAD) | ||||
| ROD CROSS SECTION | LENGTH (L) | THREAD | ||
| HEX 28 | 610 mm | 2' | R28 | R28 |
| HEX 28 | 1525 mm | 5' | R28 | R28 |
