Surface Galvanized Extruded Spherical Plain Bearing Rod

NOS Rod End Joint Bearing | Maintenance-Free & High Rigidity, Preferred for Efficient Industrial Transmission

As a key connecting component in mechanical transmission systems, rod end joint bearings are widely used in various industrial equipment, precision instruments, and automated devices due to their ability to combine rotation, oscillation, and self-aligning functions. As a representative specification of non-lubricated rod end joint bearings, the NOS model has become the preferred choice for many scenarios requiring high operational stability and convenience, thanks to its core advantages of maintenance-free operation, high rigidity, and wear resistance. Its design and performance are fully aligned with the core requirements of efficient industrial equipment operation.

Core Product Definition and Design Positioning

The NOS rod end joint bearing is a non-lubricated (maintenance-free) rod end joint bearing belonging to the external thread series. Its core design positioning is "lubrication-free, high adaptability, and long service life", tailor-made for scenarios where regular grease addition is impossible, high cleanliness is required, or maintenance is inconvenient. Unlike traditional lubricated rod end joint bearings, the NOS model achieves smooth operation without additional lubrication through a special inner lining structure, effectively reducing maintenance costs and downtime while preventing equipment and environmental pollution caused by grease leakage.

As a type of self-aligning sliding bearing, the NOS rod end joint bearing consists of an external-thread rod end body and a spherical inner ring. The precision and hardness of the spherical inner ring are comparable to those of bearing steel balls. Combined with a reasonably designed cage, it enables gap-free, ultra-smooth rotation and oscillation, accurately transmitting tensile, compressive, and bending forces while adapting to a certain degree of angular misalignment—ensuring flexible connection and power transmission between mechanical components.

Structural Characteristics and Core Advantages

(I) Unique Structural Design, Balancing Rigidity and Smoothness

The NOS rod end joint bearing adopts a composite structure: "external-thread rod end body + mirror-finished spherical inner ring + self-lubricating inner lining". The body is treated with zinc chromate to effectively enhance corrosion resistance; the spherical inner ring is quenched, hardened, and then chrome-plated, with its sliding surface processed by mirror finishing to reduce friction resistance and significantly improve wear resistance and structural rigidity. Its built-in self-lubricating synthetic resin inner lining (some specifications use a special PTFE inner lining reinforced with a copper alloy mesh) minimizes sliding surface gaps, enabling precise connecting rod movement while avoiding direct metal-to-metal friction and extending product service life.

In addition, some NOS specifications are equipped with grease nipples, allowing flexible grease supplementation according to actual working conditions to further optimize operational performance and adapt to different load and speed requirements. The rod end’s external thread design (supporting left-hand or right-hand rotation) facilitates quick connection and installation with other mechanical components, meeting the assembly needs of various equipment.

(II) Core Performance Advantages, Adapting to Complex Working Conditions

1. Outstanding maintenance-free performance: Relying on its self-lubricating inner lining, the NOS rod end joint bearing can operate stably for a long time without regular grease addition. It is particularly suitable for oil-free fields such as food machinery and medical equipment, as well as high-altitude, enclosed, or other hard-to-maintain locations—greatly reducing equipment maintenance costs and labor input.

2. Excellent corrosion and wear resistance, with strong stability: The zinc chromate treatment of the body and chrome-plating of the inner ring endow the product with superior corrosion resistance, enabling it to adapt to humid and slightly corrosive industrial environments. The cooperation between the special inner lining and mirror-finished inner ring ensures excellent wear resistance, reducing wear loss, ensuring long-term operational stability, and effectively enhancing overall equipment competitiveness.

3. Superior load-bearing capacity: Despite its compact size, the NOS rod end joint bearing can withstand large radial and bidirectional axial loads, with excellent static radial load capacity (for example, the NOS14T has a static radial load capacity of up to 15200N). It is suitable for static heavy loads, alternating loads, or impact load scenarios, meeting the high-intensity operational needs of industrial equipment.

4. Flexible self-alignment and high precision: The spherical inner ring design allows for a certain allowable inclination angle (up to 1°-3° for some specifications), which can automatically adapt to angular misalignment between mechanical components, avoiding jamming caused by installation deviations or operational deformation. High-precision processing ensures gap-free, jitter-free operation, guaranteeing power transmission accuracy and making it suitable for high-precision equipment.

5. High temperature resistance and low energy consumption: Exquisite heat treatment enhances the bearing’s hardness and toughness, enabling it to operate stably in various temperature environments while reducing cooling system energy consumption and improving equipment operational efficiency.

Key Technical Parameters (Taking the Typical Specification NOS14T as an Example)

The NOS series includes a variety of rod end joint bearing specifications, with slight parameter differences between models. The following uses the widely applied NOS14T as an example to present its core technical parameters for selection reference:

● Overall Dimensions: Length L=77mm, Diameter D=34mm, Height B1=19mm;

● Thread Specification: JIS Grade 2, External Thread M14×2;

● Holder Dimensions: W=0-0.2mm, D1=13.5mm, D2=60mm, B±0.1mm, L1=36mm;

● Spherical Inner Ring Dimensions: Inner Ring Inner Diameter d (H7)=14mm, Steel Ball Diameter Da=25.4mm (1 inch), d1=16.9mm, H=0.7mm;

● Allowable Inclination Angle: α1°=10°, α2°=16°, α3°=24°;

● Static Radial Load Capacity CS=15200N;

● Product Weight: 126g;

● Thread Direction: Supports left-hand or right-hand rotation (right-hand rotation by default; left-hand rotation requires special marking).

Note: Dimensions, load capacity, and other parameters vary across NOS rod end joint bearing specifications and can be selected based on equipment requirements.

Application Scenarios and Fields

With its core advantages of maintenance-free operation, high precision, corrosion resistance, and wear resistance, the NOS rod end joint bearing is widely used in various industrial fields—especially suitable for equipment requiring high cleanliness, stability, and maintenance convenience. Its main application fields include:

1. Precision Instrument Field: Spectroscopy products, grain/oil/food instruments, etc. Its high precision and lubrication-free design avoid lubrication pollution and ensure accurate instrument measurement and operation;

2. Medical Equipment Field: Medical chairs, etc. These require long-term stable operation and are difficult to maintain, so the maintenance-free feature reduces equipment failure rates and prevents grease pollution in medical environments;

3. Industrial Electromechanical Field: Gear grinding machines, woodworking machinery, packaging consumable tools, etc. It adapts to high-precision transmission needs, improving equipment operational stability and service life;

4. Logistics and Construction Machinery Field: Forklift industry, etc. It can withstand certain impact and radial loads, adapting to stable operation under complex working conditions;

5. Other Fields: Chemical storage and packaging equipment, mechanical accessories, bearing transmission, etc. Its corrosion resistance and high rigidity make it suitable for transmission needs in various environments.

Product Selection and Usage Notes

(I) Selection Points

1. Load Matching: Select the appropriate model based on the equipment’s actual radial and axial loads and the static load capacity of different NOS bearings to avoid bearing damage due to overload;

2. Size Adaptation: Confirm the bearing’s length, diameter, thread specification, and other dimensions based on the equipment’s installation space to ensure precise matching with other components and avoid installation deviations;

3. Working Condition Adaptation: Select the corresponding NOS specification based on the equipment’s operating temperature, ambient humidity, and presence of corrosive media. For high temperature and strong corrosion resistance, choose models with special surface treatment;

4. Thread Direction: Confirm whether the thread is left-hand or right-hand rotation based on equipment assembly needs to avoid installation failure due to incorrect thread direction.

(II) Usage Notes

1. Ensure tight thread connection during installation to prevent loosening during operation, which could affect transmission accuracy and equipment safety;

2. Avoid severe impact or overload on the bearing to prevent spherical inner ring deformation and inner lining damage, which would affect operational performance;

3. Although it is a maintenance-free bearing, regular cleaning of surface impurities is recommended when used in harsh environments (e.g., dusty, corrosive) for a long time. Supplement grease if necessary to extend service life;

4. Store in a dry, ventilated, and non-corrosive environment to prevent body rust and inner lining aging, which would affect product performance.

Product Summary

With its core advantages of maintenance-free operation, high precision, corrosion resistance, wear resistance, and strong load-bearing capacity, the NOS rod end joint bearing solves the pain points of traditional lubricated bearings—such as inconvenient maintenance and easy environmental pollution—and adapts to transmission needs under various complex working conditions. Its exquisite manufacturing process and reasonable structural design not only ensure its own stability and service life but also effectively improve overall equipment performance and operational efficiency, reducing maintenance costs. Whether for precision instruments, medical equipment, industrial electromechanics, or construction machinery, the NOS rod end joint bearing can rely on its excellent performance to become a reliable component in mechanical transmission systems, providing strong support for the efficient and stable operation of various equipment.