Full-interlocking Kelly bar is composed of three weld-on ribs with continuous  concave and convex  keys . During the drilling process, the downward thrust is transmitted to drill bucket directly by rotation power of  Rotary head inner ribs and Kelly bar outer ribs at any time . This type of Kelly bar is the best one of transferring pressure at present , especially for hard ground and frozen oil layer construction. In the drilling process , every continuous steps can form pressure point to reduce  wear and tear of local pressurization key lines, also to avoid the stick problem that Kelly pipe is deformation always in a part pressurization.

Application:Matched with piling rigs such as Bauer ,IMT,Soilmec,SANY,XCMG,Jintai,Sunward,etc.

For rock and clay ,sandy soil or silty soil construction layer.

Type:Interlcoking kelly bar,Frictional kelly bar,Square kelly bar  and tailored kelly bar.

Kelly Bar Material: Q345B ,27SiMn,35CrMo with special heat treatment,ZT600,ZY850

Kelly Bar Diatmeter:OD299-OD930mm

Kelly Bar Tube Size:130*130mm;150*150mm,200*200mm

Kelly Bar Warranty: One Year