| Thread | Rod Type | Length Range (mm) | Thread Type |
|---|---|---|---|
| R22 | Hex | 400 – 6000 | M/M |
| R22 | Hex | 800 – 3200 | F/M |
| R32 | Round | 800 – 4500 | M/M |
| R32 | Round | 800 – 4500 | F/M |
| T38 | Round | 1000 – 4500 | M/M |
| T38 | Round | 1000 – 4500 | F/M |
| T45 | Round | 1000 – 4500 | M/M |
| T45 | Round | 1000 – 4500 | F/M |
Extension rods are drilling tools used in underground mining, quarrying, tunnelling and surface mining applications with top hammer drilling systems. They form part of the drill string and help transfer impact energy from the drilling machine towards the rock face.
Drillman extension rods are manufactured using high-strength alloy steel and heat-treatment processes for demanding rock-drilling conditions. They are designed for applications involving repeated impact and continuous drilling operations.
Extension drill rods are used in applications including:
In a typical top hammer drilling system, the drill string works together with components such as threaded button bits and shank adapters.
The threaded connections provide the interface between components of the drill string, allowing impact energy generated by the drilling machine to be transferred through the rod towards the drilling tool.
Drillman supplies extension rods in multiple thread types, including R32, R38, T38, T45 and T51, for different top hammer drilling requirements.
Selection of the appropriate rod and thread depends on the drilling system and application. The rod, shank adapter and threaded bit therefore need to be correctly matched as part of the complete drilling arrangement.
For related drilling equipment, explore Drillman’s Pneumatic Drifter, Threaded Button Bits and Shank Adapters.
In top hammer drilling, impact energy travels from the drilling machine through the drill string to the bit. The rod therefore forms an important connection between the drilling equipment and the cutting tool.
During mining and quarry operations, these components are subjected to repeated impact and demanding rock conditions. Material selection, heat treatment and the condition of threaded connections are therefore important considerations when selecting drilling consumables.
Extension drill rods allow the drill string to be configured for applications requiring greater drilling depth than a single rod can provide.
Choosing the appropriate drilling components requires consideration of the drilling machine, thread system, bit and application. Compatible components help maintain a properly configured drill string for the intended drilling operation.
Drillman offers rods with different thread options for use alongside compatible top hammer drilling components. For a complete drilling arrangement, the selected rod should be matched with the appropriate shank adapter and threaded drilling bit.
These mining drill rods are intended for demanding rock-drilling applications across underground mining, quarrying, tunnelling and surface operations.
Drillman supplies extension rods as part of its range of rock-drilling consumables, together with threaded button bits, shank adapters and other drilling accessories for top hammer drilling applications.
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