■ Introduction
Friction Kelly bars are used with piling rigs for drilling in silt, clay and less dense sand and gravel. The Friction Kelly bars are un-lockable with drive keys on each section. Kelly bars can be equipped with specially designed springs or pressure plates for shock absorbing purpose.

■ Feature

・Advanced 6-Key Structural Design

The advanced 6-key configuration improves torque distribution and structural stability, ensuring reliable performance during rotary drilling operations.

・Lightweight Yet High-Strength Construction

Optimized tube structure reduces overall weight while maintaining high torsional strength, improving drilling efficiency and machine performance.

・Premium Seamless Alloy Steel Tubes

High-quality seamless alloy steel ensures precise dimensions, stable mechanical properties, and excellent weldability for long-term durability.

・Heat-Treated Wear-Resistant Drive Keys

Special heat treatment enhances hardness, flexibility, and abrasion resistance of the outer keys, extending service life in abrasive formations.

・High Drilling Efficiency for Soft to Medium Soil

Friction Kelly bars allow faster telescopic extension and retraction, improving drilling efficiency in soft soil, sand, and gravel formations.

・Cost-Effective Solution for Foundation Drilling

With simpler structure and efficient operation, friction Kelly bars provide a cost-effective option for standard piling and foundation projects.