Classification of Auger Drill Rods
Auger drill rods can be categorized under different criteria, including:
high-efficiency auger drill rods,
triangular auger drill rods,
geological auger drill rods,
wide-flight auger drill rods,
CFG auger drill rods, and
continuous-flight auger (long auger) drill rods.
The rod body is made from high-pressure seamless alloy steel tubing. The helical flights are formed from highly wear-resistant T-section steel strip and welded using a prestressed winding process. Tool joints are manufactured from premium medium-carbon alloy steel, processed through vacuum quenching and tempering, followed by high-pressure forming.
This product series uses square or hex quick-connect structures. During operation, spring pins provide automatic locking, and U-shaped or semi-ring retaining pins prevent disengagement, allowing torque to be transmitted more effectively.
Geological Auger Drill Rod
Geological auger drill rods retain the high-torque capability of conventional geological drill rods while adopting single- or double-flight helical designs produced by prestressed winding and welding.
These rods are suitable for coal mines and a wide range of drilling projects, especially deep-hole drilling in soft coal seams and coal-like formations where water flushing and cuttings removal are less effective. They provide reliable support for efficient deep-hole mine drilling and address a previous gap in domestic application.
Their key strengths are excellent fatigue resistance and shear strength, enabling long-term operation under complex geological conditions.
Continuous-Flight (Long Auger) Drill Rod
Based on the downforce application method during drilling, continuous-flight auger rods are generally divided into:
friction-feed type,
mechanical-lock feed type, and
combined-feed type.
Among these, friction-feed rods are commonly used in softer formations, including silt, clay, sand-mud layers, and pebble-bearing strata.
Continuous-flight auger rods offer:
fast penetration,
well-formed boreholes,
high operating efficiency,
high torque capacity, and
stable running performance.
They use spring-pin automatic locking for quick and efficient assembly/disassembly. For deep-hole applications, cotter pins are additionally used to enhance torque transmission and significantly reduce the risk of rod loss.
The inserted threaded connection design enables fast make-up and break-out, strong sealing performance, high tensile strength, stable pile quality, and accurate verticality—further improving construction convenience and operational reliability.
