Interlocking Kelly bar 325mm

Interlocking Kelly bar with Outer diameter 325mm

Name: Interlocking Kelly bar
Outer diameter: 325mm
Section: 3 or 4 sections
Application: Used for piling rig, bored piling machine, rotary drilling rig, piling foundation and drilling machine in rock, gravel, and dense sand.

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Specification:

Feature:

1. We strictly select high-quality raw materials and forged parts—such as the drive stub—to guarantee reliable performance and durability.

2. Heat treatment is extensively applied to key components, such as drive keys, to enhance wear resistance.

3. The Kelly bar’s high torsional strength provides above-average compression and vibration resistance, ensuring excellent performance in rock drilling.

Advantages:

Strong Torque Transmission: The Kelly bar consists of multiple interlocking inner and outer tubes. Each section is mechanically locked with keys or rails, allowing efficient transmission of high torque. This makes it ideal for drilling in hard rock or gravel layers.
Excellent Compression Resistance – Ideal for Hard Formations: With a stable structure and high rigidity, the locking bar resists bending and deformation, making it suitable for dense soils, gravel, weathered rock, and even moderately hard rock formations.
Improved Drilling Efficiency: The rigid structure enables direct and efficient transmission of crowd force and torque, minimizing energy loss and increasing drilling speed—especially in complex ground conditions.
Better Verticality Control: Thanks to its stiffness and structural stability, the Kelly bar ensures minimal deflection during drilling. This results in higher precision and improved verticality of the borehole, which is critical for cast-in-place concrete piles.
Wide Application Range: Compatible with most rotary drilling rigs, especially medium to large models. Suitable for deep boreholes (typically up to 40 meters or more), and widely used in bridge construction, high-rise buildings, subways, and other foundation engineering projects.