Product Information
| Item | Details |
|---|---|
| Model NO. | 140*200 |
| Type | Kelly Bar |
| Application | Kelly Bar |
| Certification | CE, ISO9001: 2000 |
| Condition | New |
| Ingredient | Steel |
| Colour | Customization |
| Weight | 200kg |
| Production Cycle | 2-5 Working Days |
| Parameter Size | Customization Available Upon Request |
| Product Feature | High Strength, High Wear Resistance, Anti-Fatigue |
| Technical Services | Provide Online and Offline Technical Guidance |
| Product Service | Free Spare Parts Are Provided During The Warranty |
| Transport Package | Plastic Film |
| Specification | 140*200 |
| Trademark | JM |
| Origin | China |
| Production Capacity | 200 |
| Packaging & Delivery | Package Size: 200.00cm * 25.00cm * 25.00cm |
| Package Gross Weight: 200.000kg |

Square Head Connector
Construction site conditions and operational needs are often diverse, which places high demands on the adaptability and reliability of drilling accessories. The Kelly bar square head connector (drive stub) we provide is engineered to meet these varied on-site requirements, with a focus on key performance and structural advantages:It features precision-machined dimensions to ensure a tight, gap-free fit with matching components, avoiding operational instability caused by size deviations. Crafted from high-hardness materials and treated with professional heat treatment processes, it boasts exceptional wear resistance and impact strength—able to withstand long-term high-load operations without deformation or damage. Additionally, the smooth chamfered design on its edges prevents scratches to the drill pipe or clamping device during installation and use, extending the service life of associated parts.In practical application, this connector excels at efficiently and reliably transmitting the massive rotational torque of the drilling rig to the drill pipe string, ensuring consistent power output for stable drilling. At the same time, it can bear both the downward drilling pressure and the upward lifting force during drill pipe hoisting, realizing multi-force resistance in one component. It also serves as a stable operation point for the rig’s clamping device, facilitating safe and quick clamping or releasing of the drill pipe.If you have customized needs for specifications, materials, or performance, please feel free to contact us at any time—we will provide targeted solutions based on your on-site requirements.
| Product name | Product model | Product color | Production cycle |
|---|---|---|---|
| Square head connector | 273*200 | Customized | 3 Days |
| Square head connector | 325*250 | Customized | 3 Days |
| Square head connector | 159*200 | Customized | 3 Days |
| Square head connector | 245*200 | Customized | 3 Days |
| Square head connector | 168*200 | Customized | 3 Days |
| Square head connector | 180*200 | Customized | 3 Days |
| Square head connector | 140*200 | Customized | 3 Days |
JM Rotary Drilling Rig
JM Kelly Bar

All the drill pipes are made of high-strength alloy quality pipes to ensure the dimensional accuracy of the drill pipes, as well as excellent mechanical properties and welding adaptability. Special heat treatment for secondary strengthening is carried out on special steel pipes (such as core pipe steel, etc.), significantly improving the torsional bearing capacity of the drill pipe. All the key strips of JM drill pipes are made of high-strength, fully high-quality alloy structural steel, and undergo comprehensive strengthening treatment. The inner key adopts an integral arc-shaped plate structure, significantly improving the wear resistance and lifespan of the inner and outer key strips, thereby reducing the failure rate and maintenance of the drill pipe. We also make reasonable pipe system configurations to maximize the thickness of the drill pipe key strips and the wall thickness of the steel pipe, enhancing the torque transmission and pressure drilling capabilities of the drill pipe, and reducing the occurrence of problems such as stuck rods, bent rods, and rolled keys.
JM drill pipes are the preferred choice for improving drilling efficiency and achieving maximum benefits!
Spare Parts


The company relies on one country’s “one belt, one road” development strategy, and its products are exported to Southeast Asian countries, African countries, Middle East Arabia countries and Russia. Won the trust of customers at home and abroad.
We adhere to the business philosophy of “integrity creates brand and quality casts brilliance”, pay attention to the international and domestic market and pursue excellence. We sincerely look forward to cooperating with you and warmly welcome your presence to create a better future.
Jiuman Machinery possesses complete sets of production equipment and process facilities, a clean production environment, and an excellent management system. To ensure the professional quality of the products, the company implements lean production based on its production management regulations. From the procurement of raw materials to the final delivery of finished products, strict control is exercised over the entire process, and each aspect of product manufacturing is meticulously monitored to guarantee excellent product quality.
Through technological innovation and lean management, Jiuman has successfully addressed the industry-wide challenges of high energy consumption and low output, providing customers with efficient and reliable solutions. This case exemplifies the immense potential of digital transformation in traditional manufacturing and offers valuable experience for industry upgrading.

Over the years, the company has collaborated with numerous domestic and international machinery manufacturers, including Bao E, Xugong Group, Zoomlion, Sanhe Intelligent, and CMV, contributing significantly to infrastructure projects both in China and around the world.


The R&D technology of Kelly Bars, Rotary Drilling Rigs and Excavators has passed international certifications , strictly following industry technical specifications, ensuring that the equipment meets international standards in terms of safety performance, environmental indicators and operation efficiency, and satisfying the technical requirements of customers in different regions around the world.

Fully automatic laser cutting machine

Intelligent welding machine operator

Kelly bar welding special machine
The Kelly bar welding special machine can efficiently complete two-way Kelly bar welding, significantly improving welding quality and product durability, reducing the need for manual intervention, and accelerating the production speed of products. It also has the same production efficiency for customer customization, meeting the needs of various tasks.













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