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Extension Drill Rod
BESTLINK
Extension drill rods are one major spare part in terms of drill application area, there are two shapes of extension rods, one is round type, another one is hexagonal type.
But all extension rods are threaded and made by hollow drill steels, this means usually extension rods are hollow.This hollow hole are usually named flushing hole, used for transmitting water or air during drilling. Two ends threads can be used for connecting couplings, shanks, couplings or bits. Typically two ends of extension rods are male, while sometime one end is male and another one is female, then we call it M/F rod. We need couplings to connect extension rods, while for M/F rods, because one end is female, so couplings are not necessary.
Thread Type:
For extension drill rod, there are R22, R25, R28, R32, R38, T38, T45, T51, ST58, GT60 threads, and different lengths of rods are available from 600mm to 6400mm.
Feature Of The Extension Drill Rod MF Rod:
Drill rod using thread system. Drilling precision can be further improved by using this as the first rod in a normal drill string. Furthermore, since this is a speed rod design it will produce straighter holes and at least 10% higher penetration rate in good rock conditions compared to rod and coupling sleeve combination system.
Widely used in drifting, tunneling, benching, and long hole drilling
High strength chromium-molybdenum steel with high fatigue strength and excellent wear resistance
R25 (1")
MM HEX Extension rod
Rod section 24.8mm
| Length (mm) | Part No. Fully carburized. | Part No. Surface hardened | Weight approx (kg) |
| 1220 3050 | 202-0212-C,02 202-0231-C,02 | 3.7 10.1 |
MM HEX Extension rod
Rod section 28.5mm
| Length (mm) | Part No. Fully carburized. | Part No. Surface hardened | Weight approx (kg) |
| 915 1000 1220 1525 1830 2435 3050 | 202-0309-C,02 202-0310-C,02 202-0312-C,02 202-0315-C,02 202-0318-C,02 202-0324-C,02 202-0331-C,02 | 202-0331-SH,03 | 3.3 3.9 4.5 5.7 6.9 9.2 11.9 |
MF HEX Speedrod
Rod section 28.5mm
| Length (mm) | Part No. Fully carburized. | Part No. Surface hardened | Weight approx (kg) |
| 610 1220 | 202-0306-MF-C,02 202-0312-MF-C,02 | 2.6 5.0 |
MM HEX Extension rod
Rod section 32mm
| Length (mm) | Part No. | Weight approx (kg) |
| 3050 | 207-0431-C,02 | 15.0 |
MF HEX Speedrod
Rod section 32mm
| Length (mm) | Part No. | Weight approx (kg) |
| 3050 | 207-0431-MF-C,02 | 15,7 |
MM Round Extension rod
| Length (mm) | Part No. Fully carburized. | Part No. Surface hardened | Weight approx (kg) |
| 915 1000 1220 1830 2435 3050 3660 | 203-2509-C,02 203-2510-C,02 203-2512-C,02 203-2518-C,02 203-2524-C,02 203-2531-C,02 203-2537-C,02 | 203-2524-SH,03 203-2531-SH,03 203-2537-SH,03 | 4.8 5.7 6.5 9.8 13.2 16.6 20.0 |
MF Round Extension Rod
| Length (mm) | Part No. Fully carburized. | Part No. Surface hardened | Weight approx (kg) |
| 915 1220 1525 1830 2435 3050 3660 | 203-2509-MF-C,02 203-2512-MF-C,02 203-2515-MF-C,02 203-2518-MF-C,02 203-2524-MF-C,02 203-2531-MF-C,02 203-2537-MF-C,02 | 5.5 7.3 9.0 10.6 14.0 17.1 20.7 |
MF Round Speedrod
| Length (mm) | Part No. Fully carburized. | Part No. Surface hardened | Weight approx (kg) |
| 1830 3050 | 203-2518-MF-90-C,02 203-2531-MF-90-C,02 | 11.5 19.3 |
MM Round Drifter rod
| Length (mm) | Part No. | Weight approx (kg) |
| 4000 4310 | 203-2540-03-C,02 203-2543-03-C,02 | 22.0 24.8 |
MF Round Guide rod
| Length (mm) | Part No. | Weight approx (kg) |
| 3050 3660 | 203-4731-MF-C,02 203-4737-MF-C,02 | 27.0 32.0 |
MM Hex Extension rod
Rod section 35.8mm
| Length (mm) | Part No. R38 thread | Part No. T38 thread | Weight approx (kg) |
| 1220 3050 | 235-0512-C.02 235-0531-C.02 | 8.4 18.7 |
MF Round Speedrod
| Length (mm) | Part No. R38 thread | Part No. T38 thread | Weight approx (kg) |
| 915 1220 1525 1830 3050 3660 4270 4880 5530 | 235-4709-MF-C.02 235-4712-MF-C,02 235-4715-MF-C,02 235-4718-MF-C,02 235-4731-MF-C,02 235-4737-MF-C,02 235-4743-MF-C,02 235-4749-MF-C,02 235-4755-MF-C,02 | 8.3 10.9 13.3 15.8 25.5 30.5 35.4 41.9 46.9 |
MM Round Speedrod
Surface hardened.
| Length (mm) | Part No. R38 thread | Part No. T38 thread | Weight approx (kg) |
| 1830 2435 3050 3660 3965 4270 | 204-2718-SH,03 204-2724-SH,03 204-2731-SH,03 204-2737-SH,03 | 235-2731-SH,03 235-2737-SH,03 235-2740-SH,03 235-2743-SH,03 | 14.8 19.5 24.3 30.0 32.5 33.9 |
Fully carburized.
| Length (mm) | Part No. R38 thread | Part No. T38 thread | Weight approx (kg) |
| 280 1220 1525 1830 3050 | 204-2702-C.02 | 235-2712-C,02 235-2715-C,02 235-2718-C,02 235-2731-C,02 | 2.0 10.0 12.5 14.4 24.0 |
MM Round Double Thread Extension Rod
| Length (mm) | Part No. R38 thread | Part No. T38 thread | Weight approx (kg) |
| 3050 3660 | 235-2731-95-SH,03 235-2737-95-SH,03 | 23.8 30.0 |
Drifter rod
For one rod drilling drifter rods can be used.
MF Guide Speedrod
| Length (mm) | Part No. T38 thread | Weight approx (kg) |
| 1830 3050 3660 | 235-4918-MF-C,02 235-4931-MF-C,02 235-4937-MF-C,02 | 21.1 34.5 41.3 |
Guide tube
| Hole diameter (mm) | Tube diameter (mm) | Length(mm) | Part No. | Weight approx (kg) |
| 64 64 64 64 64 64 76 | 56 56 56 56 56 56 64 | 1220 1525 1830 3050 3660 4920 3660 | 235-7012,10 235-7015,10 235-7018,10 235-7031,10 235-7037,10 235-7049,10 235-6937,10 | 12.6 14.0 17.4 28.3 32.8 47.9 51.0 |
MM Hex Extension rod
Rod section 42.6mm
| Length (mm) | Part No. Fully carburized. | Part No. Surface hardened | Weight approx (kg) |
| 3050 3660 | 236-0731-C,02 236-0737-C,02 | 25.6 30.8 |
MM Round Extension Rod
| Length (mm) | Part No. Fully carburized. | Part No. Surface hardened | Weight approx (kg) |
| 3050 3660 4270 6095 | 236-2931-SH,03 236-2937-SH,03 236-2943-SH,03 236-2961-SH,03 | 33.3 39.9 46.7 68.9 |
MF Round Speedrod
| Length (mm) | Part No. Fully carburized. | Part No. Surface hardened | Weight approx (kg) |
| 1525 1830 3050 3660 4270 6095 | 236-4915-MF-C,02 236-4918-MF-C,02 236-4931-MF-C,02 236-4937-MF-C,02 236-4943-MF-C,02 236-4961-MF-C,02 | 18.2 21.5 34.7 41.6 49.0 69.0 |
MF Guide rod
| Length (mm) | Part No. | Weight approx (kg) |
| 3660 | 236-5137-MF-C,02 | 55.0 |
Guide tube
| Hole diameter (mm) | Tube diameter (mm) | Length(mm) | Part No. | Weight approx (kg) |
| 76 76 76 76 89 89 | 64 64 64 64 76 76 | 1220 1525 1830 3660 1830 3660 | 236-6912,10 236-6915,10 236-6918,10 236-6937,10 236-6618,10 236-6637,10 | 20.0 21.6 25.4 49.0 40.0 77.8 |
MM Round Extension rod
| Length (mm) | Part No. Fully carburized. | Part No. Surface hardened | Weight approx (kg) |
| 3660 6095 | 237-3137-SH,03 237-3161-SH,03 | 52.3 84.0 |
MF Round Speedrod
| Length (mm) | Part No. Fully carburized. | Part No. Surface hardened | Weight approx (kg) |
| 1830 3660 4270 6095 | 237-5118-MF-C,02 237-5137-MF-C,02 237-5143-MF-C,02 237-5161-MF-C,02 | 27.5 51.8 64.0 85.6 |
Guide tube
| Hole diameter (mm) | Tube diameter (mm) | Length(mm) | Part No. | Weight approx (kg) |
| 89 89 102 | 76 76 87 | 1830 3660 3660 | 237-6618,10 237-6637,10 237-6837,10* | 40.0 79.1 80.0 |
Extension drill rods are one major spare part in terms of drill application area, there are two shapes of extension rods, one is round type, another one is hexagonal type.
But all extension rods are threaded and made by hollow drill steels, this means usually extension rods are hollow.This hollow hole are usually named flushing hole, used for transmitting water or air during drilling. Two ends threads can be used for connecting couplings, shanks, couplings or bits. Typically two ends of extension rods are male, while sometime one end is male and another one is female, then we call it M/F rod. We need couplings to connect extension rods, while for M/F rods, because one end is female, so couplings are not necessary.
Thread Type:
For extension drill rod, there are R22, R25, R28, R32, R38, T38, T45, T51, ST58, GT60 threads, and different lengths of rods are available from 600mm to 6400mm.
Feature Of The Extension Drill Rod MF Rod:
Drill rod using thread system. Drilling precision can be further improved by using this as the first rod in a normal drill string. Furthermore, since this is a speed rod design it will produce straighter holes and at least 10% higher penetration rate in good rock conditions compared to rod and coupling sleeve combination system.
Widely used in drifting, tunneling, benching, and long hole drilling
High strength chromium-molybdenum steel with high fatigue strength and excellent wear resistance
R25 (1")
MM HEX Extension rod
Rod section 24.8mm
| Length (mm) | Part No. Fully carburized. | Part No. Surface hardened | Weight approx (kg) |
| 1220 3050 | 202-0212-C,02 202-0231-C,02 | 3.7 10.1 |
MM HEX Extension rod
Rod section 28.5mm
| Length (mm) | Part No. Fully carburized. | Part No. Surface hardened | Weight approx (kg) |
| 915 1000 1220 1525 1830 2435 3050 | 202-0309-C,02 202-0310-C,02 202-0312-C,02 202-0315-C,02 202-0318-C,02 202-0324-C,02 202-0331-C,02 | 202-0331-SH,03 | 3.3 3.9 4.5 5.7 6.9 9.2 11.9 |
MF HEX Speedrod
Rod section 28.5mm
| Length (mm) | Part No. Fully carburized. | Part No. Surface hardened | Weight approx (kg) |
| 610 1220 | 202-0306-MF-C,02 202-0312-MF-C,02 | 2.6 5.0 |
MM HEX Extension rod
Rod section 32mm
| Length (mm) | Part No. | Weight approx (kg) |
| 3050 | 207-0431-C,02 | 15.0 |
MF HEX Speedrod
Rod section 32mm
| Length (mm) | Part No. | Weight approx (kg) |
| 3050 | 207-0431-MF-C,02 | 15,7 |
MM Round Extension rod
| Length (mm) | Part No. Fully carburized. | Part No. Surface hardened | Weight approx (kg) |
| 915 1000 1220 1830 2435 3050 3660 | 203-2509-C,02 203-2510-C,02 203-2512-C,02 203-2518-C,02 203-2524-C,02 203-2531-C,02 203-2537-C,02 | 203-2524-SH,03 203-2531-SH,03 203-2537-SH,03 | 4.8 5.7 6.5 9.8 13.2 16.6 20.0 |
MF Round Extension Rod
| Length (mm) | Part No. Fully carburized. | Part No. Surface hardened | Weight approx (kg) |
| 915 1220 1525 1830 2435 3050 3660 | 203-2509-MF-C,02 203-2512-MF-C,02 203-2515-MF-C,02 203-2518-MF-C,02 203-2524-MF-C,02 203-2531-MF-C,02 203-2537-MF-C,02 | 5.5 7.3 9.0 10.6 14.0 17.1 20.7 |
MF Round Speedrod
| Length (mm) | Part No. Fully carburized. | Part No. Surface hardened | Weight approx (kg) |
| 1830 3050 | 203-2518-MF-90-C,02 203-2531-MF-90-C,02 | 11.5 19.3 |
MM Round Drifter rod
| Length (mm) | Part No. | Weight approx (kg) |
| 4000 4310 | 203-2540-03-C,02 203-2543-03-C,02 | 22.0 24.8 |
MF Round Guide rod
| Length (mm) | Part No. | Weight approx (kg) |
| 3050 3660 | 203-4731-MF-C,02 203-4737-MF-C,02 | 27.0 32.0 |
MM Hex Extension rod
Rod section 35.8mm
| Length (mm) | Part No. R38 thread | Part No. T38 thread | Weight approx (kg) |
| 1220 3050 | 235-0512-C.02 235-0531-C.02 | 8.4 18.7 |
MF Round Speedrod
| Length (mm) | Part No. R38 thread | Part No. T38 thread | Weight approx (kg) |
| 915 1220 1525 1830 3050 3660 4270 4880 5530 | 235-4709-MF-C.02 235-4712-MF-C,02 235-4715-MF-C,02 235-4718-MF-C,02 235-4731-MF-C,02 235-4737-MF-C,02 235-4743-MF-C,02 235-4749-MF-C,02 235-4755-MF-C,02 | 8.3 10.9 13.3 15.8 25.5 30.5 35.4 41.9 46.9 |
MM Round Speedrod
Surface hardened.
| Length (mm) | Part No. R38 thread | Part No. T38 thread | Weight approx (kg) |
| 1830 2435 3050 3660 3965 4270 | 204-2718-SH,03 204-2724-SH,03 204-2731-SH,03 204-2737-SH,03 | 235-2731-SH,03 235-2737-SH,03 235-2740-SH,03 235-2743-SH,03 | 14.8 19.5 24.3 30.0 32.5 33.9 |
Fully carburized.
| Length (mm) | Part No. R38 thread | Part No. T38 thread | Weight approx (kg) |
| 280 1220 1525 1830 3050 | 204-2702-C.02 | 235-2712-C,02 235-2715-C,02 235-2718-C,02 235-2731-C,02 | 2.0 10.0 12.5 14.4 24.0 |
MM Round Double Thread Extension Rod
| Length (mm) | Part No. R38 thread | Part No. T38 thread | Weight approx (kg) |
| 3050 3660 | 235-2731-95-SH,03 235-2737-95-SH,03 | 23.8 30.0 |
Drifter rod
For one rod drilling drifter rods can be used.
MF Guide Speedrod
| Length (mm) | Part No. T38 thread | Weight approx (kg) |
| 1830 3050 3660 | 235-4918-MF-C,02 235-4931-MF-C,02 235-4937-MF-C,02 | 21.1 34.5 41.3 |
Guide tube
| Hole diameter (mm) | Tube diameter (mm) | Length(mm) | Part No. | Weight approx (kg) |
| 64 64 64 64 64 64 76 | 56 56 56 56 56 56 64 | 1220 1525 1830 3050 3660 4920 3660 | 235-7012,10 235-7015,10 235-7018,10 235-7031,10 235-7037,10 235-7049,10 235-6937,10 | 12.6 14.0 17.4 28.3 32.8 47.9 51.0 |
MM Hex Extension rod
Rod section 42.6mm
| Length (mm) | Part No. Fully carburized. | Part No. Surface hardened | Weight approx (kg) |
| 3050 3660 | 236-0731-C,02 236-0737-C,02 | 25.6 30.8 |
MM Round Extension Rod
| Length (mm) | Part No. Fully carburized. | Part No. Surface hardened | Weight approx (kg) |
| 3050 3660 4270 6095 | 236-2931-SH,03 236-2937-SH,03 236-2943-SH,03 236-2961-SH,03 | 33.3 39.9 46.7 68.9 |
MF Round Speedrod
| Length (mm) | Part No. Fully carburized. | Part No. Surface hardened | Weight approx (kg) |
| 1525 1830 3050 3660 4270 6095 | 236-4915-MF-C,02 236-4918-MF-C,02 236-4931-MF-C,02 236-4937-MF-C,02 236-4943-MF-C,02 236-4961-MF-C,02 | 18.2 21.5 34.7 41.6 49.0 69.0 |
MF Guide rod
| Length (mm) | Part No. | Weight approx (kg) |
| 3660 | 236-5137-MF-C,02 | 55.0 |
Guide tube
| Hole diameter (mm) | Tube diameter (mm) | Length(mm) | Part No. | Weight approx (kg) |
| 76 76 76 76 89 89 | 64 64 64 64 76 76 | 1220 1525 1830 3660 1830 3660 | 236-6912,10 236-6915,10 236-6918,10 236-6937,10 236-6618,10 236-6637,10 | 20.0 21.6 25.4 49.0 40.0 77.8 |
MM Round Extension rod
| Length (mm) | Part No. Fully carburized. | Part No. Surface hardened | Weight approx (kg) |
| 3660 6095 | 237-3137-SH,03 237-3161-SH,03 | 52.3 84.0 |
MF Round Speedrod
| Length (mm) | Part No. Fully carburized. | Part No. Surface hardened | Weight approx (kg) |
| 1830 3660 4270 6095 | 237-5118-MF-C,02 237-5137-MF-C,02 237-5143-MF-C,02 237-5161-MF-C,02 | 27.5 51.8 64.0 85.6 |
Guide tube
| Hole diameter (mm) | Tube diameter (mm) | Length(mm) | Part No. | Weight approx (kg) |
| 89 89 102 | 76 76 87 | 1830 3660 3660 | 237-6618,10 237-6637,10 237-6837,10* | 40.0 79.1 80.0 |
