Kelly bars are essential components used in rotary drilling rigs for deep foundation projects such as piling and borehole drilling. They transmit the torque from the rotary drive to the drilling tool and enable the application of downward pressure. Kelly bars are telescopic and can be extended to drill deep into the ground.
CriusDrill is dedicated to becoming a leading international drilling rig kelly suppliers. With years of experience, we specialize in supplying used machines and drilling components like Kelly bars drilling rig, drill bits, casings, tremie pipes, desanders, casings, hydraulic pile hammers, pile breakers, and more.
We uphold the enterprise spirit of “Quality, Efficiency, Innovation, and Integrity.” We aim to create more excellent customer value through our rich resources, advanced machinery, experienced workforce, and exceptional services. Guided by our “Quality First” business philosophy, our company is considered one of the best kelly bars suppliers.
As prominent hydraulic pile hammer suppliers, we are dedicated to providing exceptional quality and service worldwide. Our products are exported globally, reaching multiple regions. Our products and solutions have been delivered to many countries as we always hold the “Client First, Quality First” principle and maintain strict quality standards.
Kelly bars are essential components of construction drilling machines. As critical elements provided by Kelly bars suppliers, their quality directly affects the drilling equipment’s performance.
Our interlocking Kelly bars, designed for Kelly bars drilling rig, transfer rotational and pull-down movement from the drill rig’s rotary head to the drilling tools, such as drilling buckets, augers, core barrels, and casing tubing. These telescopic Kelly bars can extend from 2 to 6 times their length. The geometry of our Kelly bars is optimized using FEM (Finite Element Method) and designed to withstand high forces, reducing wear and ensuring a long service life.
Our friction Kelly bars consist of 2 to 5 telescopic tubular sections with drive keys and lock recesses welded onto their outer surfaces. Standard Kelly bars are built with six drive keys on each section. The tubular sections are made from high-tensile steel, balancing minimum weight and superior strength.
With advanced technologies from leading domestic and international Kelly bar suppliers and extensive manufacturing experience, we produce two types of high-quality Kelly Bars: Friction and Interlocking. These Kelly Bars are compatible with nearly every drilling rig on the market, including those from manufacturers such as Bauer, Sany, Soilmec, Casagrande, MAIT, IMT, CMV, LIEBHERR, Zoomlion, XCMG, CSR, LOVOL, Trive, Tescar, Yutong, Sunward, Soiltek, Jove, and more.
A friction Kelly bar is a drilling tool used with a drill to penetrate materials like clay, silt, and loose sand or gravel. It transfers crowd force and torque from the rotary drive to the drilling tool or drill. It effectively extends the auger’s reach and increases the depth of the borehole.
An interlocking Kelly bar is another drilling tool used with a drill. It is designed for drilling through both weak and solid rocks or stones. It features a mechanical locking system that secures the auger and the interlocking Kelly bar, providing stability and precision during drilling operations.
Each Kelly bar has a similar function, but how they attach to the drill differs. Friction Kelly bars rely on frictional contact between the rail of each element and the drill. On the other hand, interlocking Kelly bars use drive ribs to secure the connection. It is the primary difference between the two types. However, both are used in different soil conditions, as previously mentioned.
