Product Information
| Item | Details |
|---|---|
| Model NO. | JS419-4×8 |
| Application | Kelly Bar |
| Certification | CE, ISO9001: 2000 |
| Condition | New |
| Weight | 4200kg |
| Ingredient | Steel |
| Colour | Customization |
| Production Cycle | 3-7 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 | JS419-4×8 |
| Trademark | JM |
| Origin | China |
| Production Capacity | 100/Years |
| Packaging & Delivery | Package Size: 850cm * 42cm * 42cm Package Gross Weight: 4200.000kg |

JS419-4×8 Square Drill Pipe
As a core piece of equipment designed specifically for precise drilling scenarios, the JS419-4×8 square drill pipe establishes a solid foundation of reliability with its clear specifications. Boasting a standard model of JS419-4×8, it can reach a maximum drilling depth of 28 meters and offers excellent compatibility flexibility—it works seamlessly with various types of drilling rigs. No complex adjustments are needed, allowing it to quickly integrate into existing operational processes and significantly enhance equipment collaboration efficiency.In terms of customized details, the kelly bar of this drill pipe features an off-white appearance, which not only meets the visual requirements of industrial settings but can also be adjusted according to customers’ specific preferences, fully catering to personalized production standards. Its core performance stands out even more: it not only possesses outstanding high-strength properties to easily withstand the impact and pressure from complex rock formations but also delivers excellent high-fluidity advantages, effectively reducing the circulation resistance of drilling fluid. Meanwhile, relying on its reliable high-stability design, it ensures accurate and error-free operation during long-term continuous work, significantly extending the overall service life of the equipment and lowering subsequent maintenance costs.If you have further needs regarding product parameters, customization solutions, or technical details, please feel free to contact us at any time. We will provide you with professional and timely exclusive services!
JS419-4×8 Square Drill Pipe
| Model | Production Cycle | Condition | Length and Color |
|---|---|---|---|
| JS419-4×8 | 7 days | New | Customized |
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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