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Round rods are generally lighter than hexagonal rods and are normally used in extension drilling applications.
With the longer steel tending to be larger in diameter, conventional extension steel is characterized by the duplicate thread on each end of the steel.
Extension rods are made by hollow drill steels, different lengths are available from 600mm to 6400mm.
This hollow hole is usually named flushing hole, used for transmitting water or air during drilling.
And the threads can be used for connecting couplings, shanks adapters or button bits.
T38-Round39-T38, length1220mm/1525mm/1830mm/2435mm/3050mm/3660mm/3965mm/4270mm/4880mm/5530mm/6095mm
Double thread extension rods, T38-Round39-T38, length 3050mm/3660mm
1. T38 Extension Rod round 10 Feet
Thread: T38
Length: 10 feet (3050mm)
Have wrench flat
Drill rod using T38 threaded 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
Material: Tungsten carbide and high strength alloy steel
Processing: CNC milling and proprietary heat treatment process
T38 Extension Rod Specification
| THREADED ROCK DRILLING TOOLS - T38 | |||||||
| Extension Rod | Length | Diameter | Weight | Part Number | |||
| mm | foot | mm | inch | kg | |||
| Extension rod, T38-Round39-T38 Flushing hole 14.5mm Wrench flat 32mm | 1220 | 4 | 39 | 1 5/9 | 10.2 | ER39-T38-1220 | |
| 1525 | 5 | 39 | 1 5/9 | 12.8 | ER39-T38-1525 | ||
| 1830 | 6 | 39 | 1 5/9 | 15.3 | ER39-T38-1830 | ||
| 2435 | 8 | 39 | 1 5/9 | 20.4 | ER39-T38-2435 | ||
| 3050 | 10 | 39 | 1 5/9 | 25.5 | ER39-T38-3050 | ||
| 3660 | 12 | 39 | 1 5/9 | 30.9 | ER39-T38-3660 | ||
| 3965 | 13 | 39 | 1 5/9 | 33.2 | ER39-T38-3965 | ||
| 4270 | 14 | 39 | 1 5/9 | 35.7 | ER39-T38-4270 | ||
| 4880 | 16 | 39 | 1 5/9 | 41.0 | ER39-T38-4880 | ||
| 5530 | 18 1/7 | 39 | 1 5/9 | 46.3 | ER39-T38-5530 | ||
| 6095 | 20 | 39 | 1 5/9 | 50.9 | ER39-T38-6095 | ||
| MF-rod T38-Round39-T38 Flushing hole 14.5mm | 915 | 3 | 39 | 1 5/9 | 10.7 | MF39-T38-915 | |
| 1220 | 4 | 39 | 1 5/9 | 13.3 | MF39-T38-1220 | ||
| 1525 | 5 | 39 | 1 5/9 | 15.8 | MF39-T38-1525 | ||
| 1830 | 6 | 39 | 1 5/9 | 18.3 | MF39-T38-1830 | ||
| 3050 | 10 | 39 | 1 5/9 | 28.5 | MF39-T38-3050 | ||
| 3660 | 12 | 39 | 1 5/9 | 33.6 | MF39-T38-3660 | ||
| 4270 | 14 | 39 | 1 5/9 | 38.7 | MF39-T38-4270 | ||
| 4880 | 16 | 39 | 1 5/9 | 43.7 | MF39-T38-4880 | ||
| 5530 | 18 1/7 | 39 | 1 5/9 | 49.2 | MF39-T38-5530 | ||
| 6095 | 20 | 39 | 1 5/9 | 53.9 | MF39-T38-6095 | ||
| Hex extension rod, T38-Hex32-R38 Flushing hole 9.6mm | 1220 | 4 | 32 | 1 1/4 | 8.6 | ERH32-T38-1220 | |
| 1830 | 6 | 32 | 1 1/4 | 12.6 | ERH32-T38-1830 | ||
| 2435 | 8 | 32 | 1 1/4 | 16.6 | ERH32-T38-2435 | ||
| 3050 | 10 | 32 | 1 1/4 | 20.8 | ERH32-T38-3050 | ||
| 3660 | 12 | 32 | 1 1/4 | 24.9 | ERH32-T38-3660 | ||
| Guide speed rod, T38-Round46-T38 Flushing hole 17mm | 1830 | 6 | 46 | 1 4/5 | 23.5 | GR32-T38-1830 | |
| 3050 | 10 | 46 | 1 4/5 | 37.2 | GR32-T38-3050 | ||
| 3660 | 12 | 46 | 1 4/5 | 44.0 | GR32-T38-3660 | ||
| 4270 | 14 | 46 | 1 4/5 | 50.9 | GR32-T38-4270 | ||
| 4880 | 16 | 46 | 1 4/5 | 57.7 | GR32-T38-4880 | ||
| 5530 | 18 1/7 | 46 | 1 4/5 | 65.0 | GR32-T38-5530 | ||
| 6095 | 20 | 46 | 1 4/5 | 71.3 | GR32-T38-6095 | ||
