Explore our premium fleet of drilling rigs, cranes, and specialized piling systems engineered for peak performance.
Unlike interlocking Kelly bars that rely on physical mechanical pockets to lock the telescope joints together, Friction Kelly bars transfer torque through continuous frictional contact along their drive keys. When the rotary drive turns the outer sleeve, force is distributed continuously along the keyways of the inner telescopic tubes. This requires exceptionally tight tolerances and precise straightness parameters across the entire length of the tube.
By shifting to advanced friction key configurations, the stress concentrations inherent in interlocking notches are completely mitigated. This engineering choice is optimal for soft-to-medium ground formations, silt, clay, and sand. It permits infinitely adjustable vertical positioning and fast telescoping cycles, minimizing idle mechanical movements and maximizing structural life cycles under continuous rotational shear stresses.
Torsional capacity decreases rapidly if the concentricity of the telescopic elements fluctuates even by millimeters. High-quality friction Kelly bars are built with precision-milled drive keys and seamless steel structures to ensure uniform distribution of friction coefficients, preventing premature slippage or structural binding.
The lifetime of a Friction Kelly bar is dictated by the chemical makeup and structural heat treatment of the alloy tubes.
SINOVO utilizes premium high-strength alloy tubes such as 27SiMn and 35CrMo. These raw steel grades deliver superior yield strengths (up to 835 MPa) and fracture toughness, essential for handling high torque and crowd forces at great depths.
Custom heat treatment (quenching and tempering) transforms the steel's microstructure into tempered martensite or fine bainite. This thermal cycle optimizes the balance between structural elasticity (preventing catastrophic brittle failure) and wear resistance.
Welding drive keys onto high-yield steels induces significant heat-affected zones (HAZ). SINOVO implements post-weld stress relieving processes to eliminate residual internal stresses, preventing weld cracking and fatigue failure during operations.
SINOVO Group is a professional supplier of construction machinery equipment and construction solutions, engaged in the field of construction machinery, exploration equipment, import and export product agent and construction scheme consulting, has been serving the world's construction machinery and exploration industry suppliers.
As early as the early 1990s, the backbone members of the company have been serving in the field of construction machinery. After more than 20 years of development and innovation, the company has established a long-term strategic cooperation alliance with many top equipment manufacturers in the world and famous equipment manufacturers in China, and has won many awards in China's engineering machinery and equipment export projects for many years.
All products have successively obtained ISO9001:2015 certification, CE certification and GOST certification. Among them, the sales of piling machinery is the first brand in China in Southeast Asia market, and has continuously become the excellent Chinese supplier of African exploration industry. And in Singapore, Dubai, Algiers design services, to provide global technology and spare parts supply quality after-sales service.
A legacy of innovation, growth, and commitment to the geotechnical drilling sector since the early 1990s.
Backbone members of SINOVO group began serving in the domestic construction and drilling machinery field, establishing core technical foundations.
The company carried out strategic integration and established TEG FAR EAST company in Singapore to strengthen the development of the Southeast Asian market.
SINOVO invested in the production and manufacturing base of Hebei Xianghe emerging industry demonstration zone. Spanning 67 mu with a total investment of 120 million yuan, this facility focuses on the R&D and production of pile engineering machinery, hoisting, water well drilling, and exploration equipment. It is situated 100 km from Tianjin port, optimizing export logistics.
Today, our Beijing-based facility operates over an area of 7,800 square meters with over 50 advanced machinery sets, boasting annual outputs of 1,000 core drilling rigs, 250 water well rigs, and 120 rotary drilling rigs.
Combining structural optimization with automation to deliver robust, high-performance Kelly bars.
Every steel profile and raw tube entering our production lines receives a distinct batch code. From chemical analysis and mechanical testing reports to weld ultrasonic inspection documents, SINOVO offers 100% transparent material verification.
We leverage advanced hydraulic vertical straightening presses to assure maximum linear tolerance. Each Kelly bar section undergoes automated alignment checks to limit straightness deviation to less than 0.5% over its entire span.
To eliminate internal weld anomalies, SINOVO conducts Ultrasonic Testing (UT) on all critical load-bearing joint welds. This ensures zero defects inside the weld beads prior to painting and final mechanical assembly.
Years of Geotechnical Experience
Annual Core Drill Unit Capacity
Countries and Regions Served
Advanced Manufacturing Facilities
A technical guide to matching Friction Kelly bars to rig models and geological demands.
When engineering and sourcing a replacement or custom Friction Kelly bar, procurement engineers must evaluate torque matching, wall thickness, and outer diameter configurations. SINOVO manufactures Kelly bars compatible with all major rig brands (including SANY, Bauer, Soilmec, IMT, and CRRC).
| Rig Torque Class (kNm) | Outer Tube OD (mm) | Friction Bar Sections | Standard Kelly Box (mm) | Optimum Formations |
|---|---|---|---|---|
| 60 - 130 | Ø 292 - Ø 377 | 4-section / 5-section | 130 x 130 / 150 x 150 | Silt, Clay, Fine Sands |
| 150 - 220 | Ø 377 - Ø 440 | 5-section / 6-section | 200 x 200 | Medium Gravel, Weathered Clay |
| 250 - 360 | Ø 440 - Ø 508 | 5-section / 6-section | 200 x 200 | Deep Cohesionless Soils |
Our friction bars are engineered to resist heavy vibrations, preventing outer tube buckling under substantial pull-down loads. This structural integrity makes them ideal for deep soil mixing and large-diameter micropiling projects globally.
A comprehensive system designed to minimize down-time and secure operation reliability.
For each product, we provide customers with relevant product information and technical documentation to ensure correct applicability. All machinery goes through strict inspection and repeated testing to meet customers' demands. SINOVO products can be inspected by third-party agencies and modified according to specific contract terms.
We maintain close communication with clients and perform regular updates. SINOVO maintains a dedicated inventory of critical wearing parts to shorten delivery windows. Our typical lead time ranges from 10 to 15 days, which may scale up for complex, customized engineering orders.
We provide 1-2 weeks of on-site installation services, debugging, and training programs. SINOVO offers a one-year warranty for drilling rigs. Wear parts are replaced free of charge during the warranty period under normal operational guidelines. For damages beyond warranty coverage, we offer remote technical guidance and prompt parts dispatch.
A closer look at our engineered drilling systems and specialized foundation tools.
A versatile rig combining high efficiency, flexibility, and stability. Designed for micro piles, photovoltaic holes, anchor bolts, and casing installation.
Uses high-pressure hydraulic oil to apply wedge mechanics, generating thousands of tons of splitting force for rock fracturing and mining.
Self-erecting design using advanced hydraulic loading back technology. Integrates electronic controls. Supports both interlocking and friction Kelly bars.
Ideal for foundation support, soil nail walls, anti-floating anchors, and rock blasting hole construction.
Premium solutions for anchor drilling, jet-grouting, shallow piling, and deep soil mixing.
Engineered for high precision, this rig handles micro piling, photovoltaic installation, and rock anchoring. Offers exceptional geological adaptability and fast setup cycles.
Utilizes oblique wedge mechanical amplification to split large rock faces in seconds. Highly suitable for urban quarrying and mining where blasting is restricted.
Equipped with a compact self-erecting mast, advanced electronic control parameters, and customizable friction or interlocking Kelly bars. Excellent utility footprint.
Supports anchor drilling, casing advancement, and composite rock-soil drilling. Excellent mobility on soft slopes and complex infrastructure terrain.
Designed for soil reinforcement, anti-seepage curtains, and soft foundation grouting. Features a 3-ton auxiliary crane arm to reduce manual labor demands.
Constructed on a heavy utility loader chassis. Specially optimized for shallow utility poles, communication mast holes, and solar farm piling.
Features a dual-use air/water fluid system. Highly versatile for anti-floating anchors, tunnel grouting, micro piling, and slope support.
Equipped with a high-power top impact system. Perfect for drilling fast holes through complex gravel, sandy soil, and collapsing formations without down-the-hole hammers.
Engineered for tight access work sites and 50-90mm small diameter rock drilling. Its lightweight footprint allows setup in narrow tunnels and deep foundation pits.
Powered by a 75KW main motor, with a maximum pile depth of 28 meters and a 1200mm diameter tool capacity. Standardized for high-yield soil stabilization.
Our commitment to rigorous testing and international quality management standards.
ISO9001 Quality System Certificate
High-Tech Enterprise Certificate
CE Safety Certificate
Customs Class A Certificate
Patent Certificate (1)
Patent Certificate (2)
Patent Certificate (3)
Patent Certificate (4)
Patent Certificate (5)
Patent Certificate (6)
GOST (TR) Certificate (1)
GOST (TR) Certificate (2)
Real-world performance demonstration of SINOVO machinery across international construction sites.
A look inside our assembly divisions, quality check zones, and engineering team hubs.
Main Rig Assembly Floor
Alloy Tube Raw Inventory
Precision Lathes & Milling Machine Shop
Core Design & Hydraulic Engineering Department
International Service Operations Group
Logistics & Quality Control Management
Continuous evolution toward smart piling, telemetry-enabled Kelly bars, and sustainable metallurgy.
Under the Industry 4.0 framework, SINOVO is developing smart telemetry systems built directly into the Kelly bar’s terminal adapter. Incorporating wireless micro-strain sensors allows piling rig operators to view torsional load thresholds and bending moments in real-time, helping to prevent over-torque incidents before they occur.
Furthermore, we are optimizing steel recycling pathways and choosing eco-efficient thermal processes to reduce carbon footprint. SINOVO ensures our products meet standard environmental and safety criteria, making them compatible with strict urban emission zones globally.
Navigating global projects requires rigorous certification compliance. All SINOVO piling products, Kelly bars, and ancillary tools adhere to CE Machinery Directives and ISO-9001 quality specifications. Our distribution and logistics network stretches across key hubs including Singapore, Dubai, and Algeria.
Our localized warehouses stock replacement keys, drive ribs, springs, and guide plates, securing fast regional dispatch to keep your operations running on schedule.
Essential answers to critical engineering, maintenance, and procurement questions.
Explore our high-performance piling accessories, directional drill systems, and heavy foundation machinery.
SINOVO
