جديد وحدة حفر الآبار OEM Replacement Kelly Bar for Japanese Drilling rig

SW Kelly Bar ranks as China’s largest professional manufacturing base for Kelly bars. With over 20 years of in-depth technical expertise, we focus on high-performance drilling solutions for deep hole and hard rock operations. Serving as a major OEM supplier for mainstream drilling rig brands, our full range of products is fully compatible with all well-known global rig models. We also provide a complete portfolio of used drilling rigs, used Kelly bars and integrated drilling tools to meet diverse project demands

Ⅰ Our Advantages

●20+ years of professional concentration

●1000+ sets Kelly bar of annual production

●10000+ sets Kelly bar being in use for jobsite working

●60000+ ㎡ premises for Kelly bar production

●Plentiful stocks and Rapid delivery

●Full range of Kelly bars matched with various drilling rigs

●Authorized OEM supplier of drilling rig manufacturers in china

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Ⅱ Product Main Structure Description：

1 Steel tube

●Seamless alloy tube same ashydro-cylinder

●Much higher nominal loadingtorque of Kelly bars

●Shot Blasting before welding

2 Extermal strips

●Alloy material heat-treated

●High hardness and highabrasion-resistance

●Single length no less than 9m

3 Locking plate

●Alloy material heat-treated

●High hardness and highabrasion-resistance

●Robot cutting

4 Upper guide ring

●Three moving rings

●Wear-resistance

●Impact resistance

5 Drive shell

●Robot cutting and welding

●Intergral arc plate

●High wear resistance

6 Terminal joint

●Robot cutting and welding

●Overlapping of intermal andexternal plates

●Small tendency for cracking

7 Anti-friction plate

●Full-rotating

●Reduce wear on pipe endsand stopper plate

8 Tool joint

●Integral forging with leghth no less than1.2meters

●Significantly reduce weld load


Ⅲ Common Model of Kelly bar

Outer diameter is abbreviated as "D"（mm）

Nominal Legth is abbreviated as "L"（m）

No. of sections is abbreviated as "sec"

Nominal Torque is abbreviated as "NT"(KN.m)

Nominal drilling depth is abbreviated as "ND"( m)

●D:630, L:10 - 25, sec:4/5, NT:600, ND:36-120

●D:575, L:10 - 21, sec:4/5, NT:500, ND:36 – 100

●D:559, L:10 - 21, sec:4/5, NT:500, ND:36 – 100

●D:530, L:10 - 20, sec:4/5, NT:360, ND:36 – 95

●D:508, L:10 -18.7, sec:3/4, NT:280/360, ND:28 – 70

●D:470, L:10 - 25, sec:3/4, NT:280/400, ND:28-95

●D:470, L:10 -16.5, sec:5, NT:280, ND:28-78

●D:440, L:10 -15, sec:3/4, NT:250, ND:28-56

●D:426, L:10 -15, sec:3/4, NT:250, ND:28-56

●D:419, L:10 -15, sec:3/4, NT:250, ND:28-56

●D:406, L:10 -15, sec:3/4, NT:230, ND:28-56

●D:406, L:10 -15, sec:3/4, NT:300, ND:28-56

●D:394, L:10 -16, sec:3, NT:360, ND:28-56

●D:394, L:10 -17, sec: 4, NT:280, ND:28-65

●D:377, L:10 -14, sec:3/4, NT:220, ND:28-54

●D:368, L:10 -14, sec:3/4, NT:220, ND:28-54

●D:355, L:10 -13, sec:3/4, NT:140, ND:28-50

●D:340（343）, L:10 -13, sec:3/4, NT:230, ND:28-50

●D:299, L:10 -13, sec:3/4, NT:140, ND:28-50

★Matched with drlling rigs: XCMG, Zoomlion, Sany,CRRc,Sunward,Yutong,Tysim, jintai, Bauer,Soilmec, Liebherr,Casagrande, Mait,lMT, CMV, etc.


Ⅳ Working on construction sites all over the world

•For the past twenty years, we have been the main supplier of Kelly bars for drilling rig Chinese leading manufacturers. By matching the newly manufactured

drilling rigs, SW Kelly bars follow the China-made rotary drilling rigs and have been sent in bulk to various sites of the world. Currently, there are thousands

of sets of SW Kelly bas in use on construction sites outside China.

•For the past twenty years, we have also been directly customizing Kelly bars for overseas drilling rig users and providing Kelly bars for foreign brand drilling rigs.


Ⅴ Repair Kits & After-Sales Service

●One SW repair kit package includes allcomponents for repair

●Kelly Bar Coding & Maintenance Kit Management

●Plenty of repair kits

●Professional service team

Xuzhou Shenwei Foundation Machinery Technology Co., Ltd.（SW Kelly bar） – Kelly Bar Product FAQ

I. Product & Performance

Q: What are the core advantages of your Kelly bars in terms of strength and wear resistance?
A: Our core advantages are rooted in top-tier materials and manufacturing processes:
•Premium Tube Material: All steel tubes for our Kelly bars are made exclusively from high-strength seamless steel tubes for hydraulic props. We never use ERW welded tubes or similar seamed pipes. The primary material is high-strength alloy steel such as SW800 for hydraulic cylinders. After quenching and tempering heat treatment, its yield strength reaches ≥850 MPa and tensile strength ≥1000 MPa, far exceeding ordinary welded tubes, ensuring exceptional safety and reliability.
•Critical Component Enhancement: All key strips are made of high-strength gear alloy steel. All pressure locking plates and inner key locking plates are made of high-strength alloy steel (hardness up to HRC 50). All undergo secondary heat treatment to ensure extreme wear resistance and overall strength.
•Advanced Structural Design: The adoption of a dual-lock point pressure structure (for some models) and a triple-ring guiding structure effectively improves stability, dampens impact, and comprehensively enhances the strength and operational convenience of the Kelly bar.

Q: What are the main types of SW Kelly bars? How to choose?
A: We primarily manufacture three series: Interlocking, Friction, and Combination Kelly bars.
•Interlocking bars transmit down-the-hole (DTH) pressure through internal mechanical lock points, suitable for hard rock, boulder, and similar formations.
•Friction bars rely on friction between tube sections to transmit torque and DTH pressure, ideal for soft ground like clay and sand layers.
•Combination bars integrate features of both, allowing flexible adjustment based on ground conditions.
Selection should comprehensively consider your drilling rig model, site geology, required drilling depth, rated torque, and DTH pressure. Our technical team can provide professional selection guidance based on your specific working conditions and detailed parameters from your technical agreement.

Q: Can you customize Kelly bars with non-standard dimensions or special requirements?
A: Yes. Customization is one of our core capabilities. We possess a strong R&D team and flexible production lines, enabling rapid design and production based on your rig's special interface requirements, non-standard lengths needed, or specific performance demands (e.g., higher torque or pressure). Please provide your detailed technical agreement or requirements.

II. Quality & Reliability

Q: How does SW ensure the quality and reliability of its Kelly bars?
A: We ensure quality through a comprehensive, process-embedded system:
•Strict Source Control: All steel tubes are selected from high-quality alloy seamless tubes conforming to the coal mine standard for "Seamless Steel Tubes for Hydraulic Props." Material certificates are provided, ensuring primary strength from the source.
•Process Guarantee: We employ our self-developed automatic welding production lines for welding, ensuring uniform and reliable weld strength. Critical components undergo strict heat treatment processes to optimize performance.
•Comprehensive Inspection: Advanced non-destructive testing equipment like phased array ultrasonic testing is used for weld inspection. Each Kelly bar set leaving the factory has a unique "ID card" (inspection record sheet), detailing the entire production process and quality data, ensuring full traceability.

Q: Are there any successful application cases?
A: Absolutely. SW Kelly bars have become a representative brand for high-end rotary drilling Kelly bars. Our products are widely used in major domestic and international infrastructure projects and exported to dozens of countries and regions worldwide. We provide OEM and replacement services for numerous mainstream brand rotary drilling rigs.

Q: If a failure occurs, what are the usual causes?
A: Based on our extensive after-sales experience, the vast majority of field failures stem from non-standard operation, insufficient maintenance, or accidental damage. Examples include forced retraction without complete unlocking, long-term overload use, and failure to repair worn parts promptly. Genuine material or design defects are extremely rare. We provide detailed "Operation and Maintenance Manuals" and strongly recommend customers follow the specifications, which can effectively prevent most issues.

III. Price & Value

Q: SW products seem to be priced higher than some market equivalents. Where is the value?
A: When choosing a Kelly bar, we advise focusing on "Total Cost of Ownership" and "Long-term Return on Investment." Our high value is reflected in:
•Longer Service Life: The use of hydraulic prop-grade high-strength seamless tubes and wear-resistant components significantly extends replacement cycles.
•Higher Construction Efficiency: Reliable performance reduces unplanned downtime, ensuring project progress.
•Lower Comprehensive Cost: Excellent durability reduces maintenance frequency and part replacement costs.
•Comprehensive Professional Support: We provide full-cycle services from selection and operation training to rapid after-sales response.

IV. After-Sales Service & Support

Q: After purchase, how can I get support for technical issues or required spare parts?
A: We have a global after-sales service network. You can contact our technical service center directly via phone, WeChat, WhatsApp, or email. We provide remote guidance, rapid spare parts supply (standard parts are often in stock), and necessary on-site service support when required. The detailed records for each Kelly bar set also provide precise technical basis for subsequent maintenance and spare parts procurement.

V. Company Strength

Q: What is SW position in the industry?
A: SW Kelly bar is a professional leader in the rotary drilling Kelly bar field with profound R&D and manufacturing experience. We consistently adhere to using high-strength seamless steel tubes for hydraulic props and advanced heat treatment processes as our core. Our product performance meets international high standards, and we are a strategic partner for numerous OEMs and large construction enterprises.