Hebei KongRui Machinery Equipment Co.,Ltd

KR Drilling machinery is one of the leading manufactory in China dedicated to providing high quality Kelly bars for piling rigs. The interlocking and Friction Kelly bar we supplied ranges from Outer diameter 299mm to 630mm, from 3 section to 6 sections, For internationally renowed brands of drilling rig including Bauer / Soilmec/ Casagrande/ Liebherr/ IMT / Mait / Sany /XCMG/ Sunward/ Zoomlion/ TEG....

Usually Interlocking Kelly bar is applied to strong hard rock formation. It adopts six-ribs and several sets drive pressure key welded onto their surface. Also inner keyboards are made from high-tensile steel under special heat treatment.

First of all, it is because of our strict control on the material. When it comes to materials, we never cut corners. The first two sections of kelly bar are made of high quality SY550. Moreover, our kelly bar adapter is forged with 25CrMo material.

We have innovatively added a reinforcement ring structure for each terminal joint, which is heat-treated to effectively reduce the risk of cracking the pipe during drilling.

The design of long guiding structure can improve the verticality of hole formation, improve the stress on the lower pipe orifice, reduce the failure rate of lower pipe cracking, improve the stability of drill pipe compression, increase the width of the retaining ring, and prevent the deformation of the pipe orifice.

For springs, we normally use the same disc springs as Bauer’s original kelly bar, which has a high load capacity for all kinds of kelly bar and a service life of over 3000hr. However, considering that what spring is used depends on the pressure, we will also use spiral spring for some friction kelly bar due to the low pressure.

Quality Guarantee And Warranty

Kelly bar of Unidrill is accompanied by a one year or 2000 working hours warranty. Customer satisfaction is our first and most important priority. Our warranty policy goes above and beyond our competitors and is one of the best reasons to do business with us. We want our customers to have an exceptional buying experience every time. Our warranty policy is designed to maximise our customers’ confidence.

For Bauer, Soilmec, Casagrande, Liebherr Rigs And More..
We provide drill pipe customization service. You can customize the length, diameter, drill pipe accessories and even drill pipe color for your Bauer or Soilmec etc. drill rig