Tapered drill rod, also known as taper rod or tapered drill steels, features a hexagonal chuck section designed to provide leverage for the rotation chuck bushing. It typically includes a forged collar to maintain the correct shank striking face position within the rock drill, ending in a tapered bit attachment. These rods are available in lengths ranging from 0.6 m to 8.0 m, measured from the collar to the bit end.
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Shank Specifications
Available in Hexagon sizes: 19 x 108 mm, 22 x 108 mm, 25 x 108 mm, and 25 x 159 mm.
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Taper Degrees
Offered in 7, 11, and 12-degree tapers to optimize drilling productivity across various rock types.
Application Guide
For modern drill rigs and medium-hard to hard abrasive rock formations, 11 and 12-degree taper angles are standard. These are compatible with hydraulic rock drills like model PD-Y58 and pneumatic models such as Y6, Y10, Y24, YT24, and YT 27.
Softer Formations
A narrow 7-degree taper is utilized for low-impact rock drills and softer formations, frequently used in granite and marble quarrying operations.
A comprehensive range of compatible taper button bits, cross bits, and chisel bits is available with matching 6, 7, 11, and 12-degree tapers. These bits support drill hole diameters from 28mm to 57mm. Taper button bits are ideal for small hole drilling in conjunction with air leg or hand-held jackhammer drillers in mining and quarrying environments.
Technical Parameters
- • Connect Shank: Hex 22, Φ25 maximum
- • Bit Diameter: 32mm, 34mm, 36mm, 38mm, 40mm
- • Material: Alloy Steel Bar 45CrNiMoV
- • Tips: Tungsten Carbide YK05 or T6
- • Button Shape: Ballistic or Flat Face
- • Button Quantity: 5, 7, or 8 pcs
All products are manufactured using advanced equipment and strict quality control procedures to ensure high durability and performance. By persisting in high quality and competitive standards, these tools are designed to meet the rigorous demands of global mining and rock drilling projects, providing a bright prospect for efficient field operations.
What are the available lengths for tapered drill rods?
Tapered drill rods are available in a wide range of lengths starting from 0.6 meters up to 8.0 meters, measured from the collar to the bit end.
Which taper degree should I choose for hard rock drilling?
For medium-hard to hard and abrasive rock formations, 11-degree and 12-degree taper angles are recommended for modern hydraulic and pneumatic drill rigs.
What materials are used in the construction of these drill rods?
The rods are manufactured from high-quality 45CrNiMoV Alloy Steel Bar, while the tips utilize Tungsten Carbide (YK05 or T6) for maximum wear resistance.
What is the difference between a 7-degree and 12-degree taper?
A 7-degree taper is typically used for lower impact drills and softer rock like marble or granite. The 11 and 12-degree tapers are designed for higher impact, modern drilling equipment and harder rock formations.
What types of bits can be used with these rods?
These rods are compatible with a variety of taper bits, including button bits, cross bits, and chisel bits, with diameters ranging from 28mm to 57mm.
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