Product Introduction
Friction Kelly bar is a commonly used type of extendable Kelly bar in rotary drilling rigs, which mainly relies on the frictional force between the key bars to creat pressure and transmit torque of the pile driver. It is suitable for drilling operations in low to medium hardness formations such as soft soil, sand layers, and clay.

Applicable working conditions of friction kelly bar
Construction engineering: building pile foundation, foundation pit support pile.   
Municipal engineering: construction of pipe piles and retaining piles.   
General soil layers: medium soft strata such as clay, silt, and sand layers.  
Not suitable for: hard rocks, large boulders, high-strength weathered rock layers (requiring the use of interlocking kelly bar).
Limta kelly bar feature:

1.Strict selection of raw materials and forging parts such as drive stub to assure the reliable quality;
2.Heat treatment is widely used in the key parts such as drive keys to improve hardness and wear resistance;

3.With high torsional coefficient, the compression and vibration resistance of Kelly bar is higher than average level, high efficient when drilling in the soil formation.