Drilling Rods Introduction and Applications
Rock drilling tools, including drill bits, drill rods, and shank adapters, are used for blast-holes drilling in rock formations. The drill rod serves as the connecting link between the shank and the bit, transmitting impact energy and rotational torque from the rock drill.
Heavy-duty drill rods are categorized by application into drifting rods, medium- to deep-hole mining rods, surface mining rods, and roof bolting rods.
For jumbo drilling applications, the R32 thread series is the most widely used drifting rod type, employed in tunnel drifting and underground excavation projects to drill blast holes with diameters ranging from 43 to 51 mm. Rod lengths are available from 3,700 mm to 6,400 mm.
The rock tools for Hydraulic jumbo are classified by the thread model on the bit-end connection. Given that blast-hole diameters typically range between 41mm and 51 mm, the diameter at the bit-end connection must be kept below 32 mm.
With the continuous advancement in hydraulic rock drill performance—particularly higher impact power and increased output torque—the reduced cross-section at the thread root on the bit-end connection to match with the top hammer bits has become the weakest point of the rod body. To enhance material strength, the industry has introduced the α250, α280, and α330 thread series, along with the SR32, SR35, and SR38 series, as well as the TC35 and TC42 series.
XTC Luoyang offers a comprehensive drilling rods range, manufactured with high-quality alloy steel, advanced carburizing heat treatment, and precision machining technology. The rods deliver consistent product quality, extended service life, and proven performance in mining operations across multiple regions, contributing effectively to cost reduction and efficiency improvement for customers.
Application Case
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Testing site |
A gold mine in Shandong China |
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Rock type、hardness、Quartz content |
Rock hardness F10-12 |
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Working conditions（e.g: hole pattern） |
Approximately 70 holes per working face |
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Jumbo Model & Quantity |
Wuxin Jumbo, Atlas Copco K111 |
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Rock drill model |
1838HD and 23K |
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Pressure data MPa |
Water pressure |
Feed pressure |
Rotation pressure |
Impact pressure |
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0.3-0.4 |
7 |
5 |
18 |
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The drill rod offered a service life with 12 working faces，approx. 3,200m |
A competitor Brand X:service life is 8 working faces, approx. 2,100m |
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