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Kelly Box of Kelly Bar for rotary drilling rig
Kelly Box of Kelly Bar for rotary drilling rig
Kelly Box of Kelly Bar for rotary drilling rig
Kelly Box of Kelly Bar for rotary drilling rig
Kelly Box of Kelly Bar for rotary drilling rig

Kelly Box of Kelly Bar for rotary drilling rig

Different name:Kelly bar square head, Kelly bar box,rig parts
Main application:drill rig, Kelly bar, deep drilling,
Core specification parameters:200*200mm, Bauer type, Soilmec type, interlock Kelly bar,
Applications:Kelly bar, rotary drill rig, drilling rig, Deep foundation engineering, bored piling, Drilled shafts, cast-in-drilled-hole piles, Civil engineering, Infrastructure, building, bridge, high-speed railway etc.
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Kimdrill offers a wide range of accessories for Kelly Bar like swivel, bearing, spring, rubber ring, kelly box, pallet, kelly guide and so on. 

Kelly box also known as Kelly square head, is one part of Kelly bar which used to connect the drilling tools like bucket, auger and casing drive. The most comment size is 200*200mm in Bauer type. We also produce the model like 130*130mm, 150*150mm as requests. 

We are capable to offer the Kelly box for Kelly bar from Bauer, Soilmec, Mait, Casagrande, XCMG, SANY, CMV, Sunward, Zoomlion, IMT, Jintai and so on.


200*200mm, 150*150mm, 130*130mm

Package and Delivery:

Wooden case or pallet; By Sea or by air.

Place of Origin:Made in China
Model:Kelly Box
Compatible with:Interlock Kelly Bar, Friction Kelly Bar, rotary drill rig
Certification:ISO 9001/ COC/PVOC
Minimum Order Quantity:1 set
Packaging Details:Case or pallet.
Delivery Time:At stock or 7 working days
Competitive Advantage
  • Top quality raw material

  • With reliable and durable performance

  • With rich experience of manufacturing and exporting

  • Familiar with the rotary drilling rig in difference brand and model


drilling rig swivel

kelly box

swivel production

wooden case


1. What is a Kelly box in the context of a rotary drilling rig?

The Kelly box is a component of the Kelly bar on a rotary drilling rig, serving as the connecting interface between the Kelly bar and the drilling tool or the rotary drive. It is crucial for the transmission of torque and axial force during drilling.

2. What's another term for a Kelly box?

The Kelly box is sometimes also referred to as a "drive bushing" or "drive square" in the industry.

3. What is the primary function of a Kelly box?

Its primary function is to provide a secure and stable connection between the Kelly bar and the drilling tool or rotary drive, ensuring efficient operation.

4. What is the typical design of a Kelly box?

A Kelly box usually has a square or rectangular cross-sectional shape to fit snugly into the corresponding opening in the drilling tool or rotary drive.

5. Does the size of the Kelly box vary?

Yes, the size of the Kelly box varies depending on the specifications of the Kelly bar and the drilling equipment, and it must be compatible with both for efficient drilling.

6. What material is used to make a Kelly box?

Kelly boxes are made from high-strength, durable materials to withstand high torque and axial loads during drilling operations.

7. How important is the maintenance of a Kelly box?

Regular inspection and maintenance are vital to ensure the effectiveness and safety of the Kelly box. It should be checked for damage or wear and replaced if necessary.

8. In what drilling applications is a Kelly box used?

It's used in various drilling applications, including constructing foundations, bridges, and other structures requiring deep foundation drilling.

9. How does a Kelly box contribute to the safety and efficiency of drilling operations?

A properly functioning Kelly box ensures that the Kelly bar remains securely attached to the drilling tool or rotary drive, crucial for safe and efficient drilling.

10. Can a Kelly box be custom-made for specific drilling requirements?

Yes, custom-made Kelly boxes can be produced to meet specific requirements or to fit unique drilling equipment, ensuring optimal performance in specialized drilling operations.