Product Information
| Item | Details |
|---|---|
| Model NO. | General |
| Type | Kelly Bar Drive Stub |
| Application | Kelly Bar |
| Certification | CE, ISO9001: 2000 |
| Condition | New |
| Ingredient | Steel |
| Colour | Customized |
| Weight | 25kg |
| Production Cycle | 2-3 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 | General |
| Trademark | JM |
| Origin | China |
| Production Capacity | 100 |
| Packaging & Delivery | Package Size: 30.00cm * 5.00cm * 5.00cm |
| Package Gross Weight: 26.000kg |

Pinion Shaft for Kelly Bar Drive Stub
This product is a dedicated pinion shaft designed for the Kelly Bar Drive Stub, serving as a core force-transmission and protection component in drilling operations, with three key functional advantages:- Direct and reliable force transmission: The pinion shaft passes through the pin holes on both sides of the square head, directly transferring the rotational force from the power head square sleeve to the drill pipe square head. It bears all the torque output by the drilling rig, completely avoiding the risk of slippage that may occur when relying solely on frictional force for transmission.
- Priority load-bearing and component protection: As a specialized shear-resistant part, the pinion shaft takes the lead in withstanding sudden load changes during operation. Made of high-strength alloy steel, it can resist massive shear stress—this design effectively shields the tooth profiles of the square head and square sleeve from impact damage, extending the service life of core components.
- Precise positioning for drilling accuracy: The pinion shaft and square sleeve feature a precise fit, ensuring the drill pipe achieves zero-clearance axial positioning within the power head. This eliminates any unwanted movement of the drill pipe during the drilling process, directly guaranteeing the vertical accuracy of the borehole.
Should you have any customization needs, parameter adjustments, or further inquiries, please do not hesitate to contact us at your convenience. We are ready to provide professional support tailored to your operational requirements.
| Product name | Product model | Product color | Production cycle |
|---|---|---|---|
| Kelly bar drive stub “Pin head” | General | Customized | 2-5 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.


















