ZHEJIANG SHUANGNUO BEARING TECHNOLOGY CO., LTD.,

Introduction

Zhejiang Shuangnuo Bearing Technology Co., Ltd. (浙江双诺轴承科技股份有限公司) is a Chinese manufacturer specializing in self-lubricating bearings, copper-alloy bearing materials, and related sliding components. The company is based in Jiashan County, Zhejiang Province, and serves industrial equipment manufacturers through cast, sintered, composite, and machined bearing products.

Shuangnuo occupies a specialized position within the broader plastics and machinery ecosystem. Its products are not plastics-processing machines or polymer producers; rather, they are engineering components used in equipment that operates under demanding loads, oscillating motion, contamination, elevated temperatures, or restricted lubrication conditions. These include injection-molding machinery and production-line equipment, as well as metallurgical, mining, lifting, marine, energy, and construction machinery.

The company’s principal technical focus is the development and manufacture of oil-free or self-lubricating bearing systems. Its product portfolio includes brass, aluminum-bronze, and tin-bronze components; solid-lubricant-embedded bearings; sintered and bimetallic products; wrapped bearings; and PTFE-based composite bearings. Manufacturing capabilities include centrifugal casting, continuous casting, metal-mold casting, sintering, machining, and material-composition control.

History and Development

Shuangnuo was established in Zhejiang as a specialist bearing enterprise and has concentrated its activities on self-lubricating bearing research and production for approximately a decade, according to company materials.

Important development milestones include:

• Expansion from copper-alloy casting into the production of finished self-lubricating bearing components.
• Addition of centrifugal casting, continuous casting, and metal-mold casting to support different alloy geometries and product specifications.
• Development of sintered, bimetallic, wrapped, and composite bearing categories alongside cast bronze products.
• Extension of the product range toward international material grades and customized original-equipment-manufacturer and original-design-manufacturer supply.

These developments reflect a wider industry trend in which bearing manufacturers integrate material production, machining, and surface or lubrication engineering to improve control over performance and delivery.

Business Operations and Segments

Shuangnuo’s activities can be grouped into four closely related operating areas:

The company describes process controls that include furnace-side composition inspection and subsequent testing of finished cast products. Such controls are particularly relevant to bearing manufacture because alloy composition, porosity, hardness, dimensional stability, and surface condition affect load capacity and wear behavior.

Products and Technologies

Copper-alloy bearings

The company manufactures bearings and semi-finished materials based on several copper-alloy families:

• Brass bearings for general sliding and moderate-load applications.
• Aluminum-bronze bearings for higher mechanical strength and wear resistance.
• Tin-bronze bearings where conformability, machinability, and sliding performance are important.
• Cast alloy components produced in cylindrical, flanged, plate, and custom geometries.

Copper alloys are widely used in industrial sliding bearings because they combine mechanical strength, heat conductivity, machinability, and resistance to seizure under suitable operating conditions.

Solid-lubricant-embedded bearings

Solid-inlaid bearings incorporate lubricant plugs or inserts into a metallic bearing body. The inserts gradually provide lubrication at the sliding interface, reducing dependence on continuous oil or grease supply. These components are suitable for applications involving intermittent operation, oscillating movement, heavy loads, or difficult access for maintenance.

Composite and PTFE-based bearings

The company’s SF-1-type products use a multilayer construction consisting of a low-carbon-steel backing, a porous sintered-bronze interlayer, and a PTFE-based sliding surface. This design is commonly intended to combine structural support from the steel backing with the low-friction and dry-running characteristics of a polymer-based lining.

Typical process capabilities relevant to such products include:

• Forming and sizing of steel-backed bearing shells.
• Sintering of porous bronze interlayers.
• Application and bonding of polymer-based sliding layers.
• Precision machining of internal diameters, external diameters, flanges, and mounting surfaces.
• Production of components for reciprocating, oscillating, and rotary motion.

Performance depends on load, speed, temperature, counterface material, alignment, contamination, and lubrication conditions. Consequently, bearing selection generally requires application-specific dimensional and operating data rather than relying solely on material category.

Bimetallic and wrapped bearings

Bimetallic bearings combine a steel structural layer with a bearing alloy or sintered surface. Wrapped bearings are formed from strip material into cylindrical or flanged components and are often selected where compact construction, consistent dimensions, and economical high-volume production are required.

These products are relevant to industrial machinery because they can reduce component weight, simplify replacement, and provide a controlled sliding interface in applications where conventional rolling bearings are unsuitable.

Applications and End Markets

Shuangnuo identifies a broad range of industrial applications for its products:

• Plastic injection-molding machinery and related production lines.
• Continuous-casting and metallurgical equipment.
• Steel rolling machinery.
• Mining and material-handling equipment.
• Molds and dies.
• Cranes and lifting machinery.
• Textile machinery.
• Wind-power equipment.
• Ships and marine machinery.
• Steam turbines and hydraulic turbines.
• Construction and general industrial machinery.

Within plastics manufacturing, self-lubricating bearings may be used in mold mechanisms, guide systems, actuators, automation equipment, material-handling units, and other assemblies requiring precise movement. Their value lies in reducing maintenance requirements and enabling operation in areas where conventional lubrication is difficult, undesirable, or vulnerable to contamination.

Global Presence and Market Position

Shuangnuo states that its sales network extends to international markets and presents itself as an OEM and ODM supplier of self-lubricating bearing products. Its market position is best understood as that of a specialized component manufacturer serving industrial customers through a combination of material variety, casting capability, product customization, and application coverage.

The company competes in a fragmented international market that includes:

• Traditional bronze-bearing manufacturers.
• Producers of polymer-lined and composite bearings.
• Suppliers of sintered and bimetallic components.
• Integrated bearing groups offering both rolling and plain-bearing technologies.
• Regional machine-component manufacturers with customized production capabilities.

Competitive factors in this sector include dimensional accuracy, alloy consistency, friction and wear performance, delivery reliability, technical support, and the ability to manufacture small or medium production runs alongside standardized products.

Research and Development

Research and development at Shuangnuo is centered on self-lubricating bearing materials and manufacturing processes. Its technical activities include the development of copper-alloy grades, solid-lubricant systems, sintered composites, bimetallic structures, and polymer-lined bearings.

Relevant development priorities include:

• Improving wear resistance and service life.
• Matching bearing materials to load, speed, temperature, and motion type.
• Controlling casting composition and internal quality.
• Refining machining accuracy and dimensional repeatability.
• Developing products for reciprocating and oscillating motion.
• Adapting bearing dimensions and materials to customer drawings and equipment designs.

The company’s integration of casting, material preparation, machining, and composite production allows it to address both material and component-level requirements.

Sustainability and Environmental Considerations

Self-lubricating bearings can contribute to equipment-efficiency objectives by reducing the need for frequent relubrication and by supporting longer maintenance intervals in suitable applications. In plastics-processing plants, these characteristics may help reduce lubricant consumption, maintenance interventions, and the risk of oil or grease contamination near production equipment.

The environmental profile of a bearing nevertheless depends on its full life cycle. Relevant factors include:

• Energy use in metal melting, casting, sintering, and machining.
• Recycling and recovery of copper alloys and steel backing materials.
• Use and disposal of polymer-based sliding layers.
• Service life and replacement frequency.
• Lubricant consumption during operation.
• Management of machining residues and industrial waste.

The shift toward longer-life components and lower-maintenance equipment is an important industry trend, although the environmental benefits depend on actual operating conditions, material recovery, and end-of-life handling.

Quality Management and Manufacturing Control

Shuangnuo describes inspection of alloy composition during melting and further testing after casting. Such controls support the consistency required for bearing manufacture, where small variations in composition or microstructure can affect hardness, friction, wear, load capacity, and machinability.

Key quality characteristics for its product categories include:

• Chemical composition of copper alloys.
• Casting integrity and porosity control.
• Surface finish and dimensional tolerances.
• Bonding between backing, interlayer, and sliding surface.
• Hardness and mechanical strength.
• Internal diameter and clearance accuracy.
• Consistency of solid-lubricant or polymer-lined surfaces.

For customized industrial components, quality assurance also involves drawing review, sample approval, process inspection, and final dimensional verification.

Innovations and Future Outlook

Shuangnuo’s future development is closely connected to several structural trends in industrial machinery:

• Greater demand for maintenance-reduced equipment.
• Wider use of automation and motion-control systems.
• Increasing operating loads and duty cycles in machinery.
• Need for components capable of functioning in contaminated or poorly lubricated environments.
• Demand for lightweight, compact, and application-specific bearing assemblies.
• Expansion of industrial equipment supply chains across Asia and other export markets.

Potential areas of technological development include higher-performance polymer composite linings, improved bronze and aluminum-bronze formulations, more precise control of porous sintered structures, and digital inspection of dimensional and material characteristics.

In the plastics industry, continued investment in injection molding, extrusion, automation, and auxiliary equipment should sustain demand for specialized sliding components. At the same time, customers are likely to require stronger documentation of service life, material traceability, environmental performance, and conformity with international technical specifications.

Summary

Zhejiang Shuangnuo Bearing Technology Co., Ltd. is a Zhejiang-based manufacturer focused on self-lubricating bearings and copper-alloy sliding components. Its capabilities span centrifugal, continuous, and metal-mold casting; sintered and bimetallic construction; composite and PTFE-lined bearings; machining; and customized OEM and ODM production.

The company serves a diverse industrial base that includes plastics-processing machinery, metallurgy, mining, lifting equipment, energy systems, marine equipment, and general mechanical engineering. Its significance within the plastics ecosystem arises from supplying specialized motion components that support the reliability, maintainability, and operating efficiency of polymer-processing and industrial production equipment.

References

• •

  CPS+ eMarketplace. (n.d.). ZHEJIANG SHUANGNUO BEARING TECHNOLOGY CO., LTD.,ZHEJIANG SHUANGNUO BEARING TECHNOLOGY CO., LTD.,. CPS+ eMarketplace. https://www.chinaplasonline.com/eMarketplace/ExhibitorInfo?CompId=1039536Link