In food processing equipment conveyor chains, self-lubricating bearings maintain smooth operation under strict hygiene requirements that prohibit lubricating oil contamination of food. In medical device precision adjustment mechanisms, self-lubricating bearings complete every precise positioning in sealed spaces inaccessible for regular maintenance. In packaging machinery high-speed reciprocating motion, self-lubricating bearings operate continuously in clean environments where grease cannot be applied. In automotive seat and window adjustment mechanisms, self-lubricating bearings maintain low noise and low friction through hundreds of thousands of operating cycles. In every piece of equipment where maintenance is impossible or lubrication is prohibited, self-lubricating bearings are the core precision components achieving maintenance-free, long-life, contamination-free operation.

 

Self-lubricating bearings are a special type of bearing that achieves self-lubrication using the material itself or embedded solid lubricants. Their basic structure consists of a metal substrate (steel back or copper base) with embedded or compounded self-lubricating materials (graphite, molybdenum disulfide, PTFE, etc.). During operation, the lubricant inside the bearing gradually releases under frictional heat, forming a stable lubricating film between the journal and bearing, achieving continuous lubrication without external oil supply. Self-lubricating bearing friction coefficients typically range from 0.03 to 0.20, higher than rolling bearings but far lower than unlubricated sliding friction, requiring no maintenance throughout the entire service life.

 

Self-lubricating bearings are classified into three major types based on structure and materials——composite type (metal and plastic composite with solid lubricants in the plastic layer, suitable for medium loads and speeds), embedded type (solid lubricants embedded in holes or grooves of the metal matrix, suitable for heavy loads and high temperatures), and all-plastic type (entirely made of engineering plastic with built-in solid lubricants, suitable for light loads and corrosive environments). Self-lubricating bearings are widely used in food machinery, medical devices, packaging machinery, automotive mechanisms, office equipment, textile machinery, instrumentation, water treatment equipment, valves, pumps, compressors and various industrial equipment where maintenance is impossible or lubrication is prohibited.

 

NMT Self-Lubricating Bearing Technology Solutions

 

Japan NMT self-lubricating bearings are specialized product series developed specifically for the stringent requirements of maintenance-free and oil-free lubrication applications——self-lubrication, long life, corrosion resistance and high reliability.

 

Composite Self-Lubricating Material System——Composite self-lubricating bearings are one of the most widely used types of self-lubricating bearings. NMT composite self-lubricating bearings consist of a steel back and a polymer self-lubricating layer——the steel back provides high-strength structural support and load capacity, while the polymer self-lubricating layer (PTFE-based or POM-based) provides excellent self-lubricating and wear resistance properties. The self-lubricating layer contains uniformly distributed solid lubricant particles that continuously release lubricant to the friction surface during operation. The bonding interface between the steel back and self-lubricating layer undergoes special bonding and heat treatment processes for high bond strength without delamination. Composite self-lubricating bearings suit medium loads and low-to-medium speeds, widely used in automotive, office equipment, home appliances, packaging machinery and other applications. NMT composite self-lubricating bearings allow loads up to 50-250N/mm² with operating temperature range of -40℃ to 120℃.

 

Embedded Self-Lubricating Material System——Embedded self-lubricating bearings are the preferred solution for heavy-load self-lubricating applications. NMT embedded self-lubricating bearings use high-strength copper alloy (CuSn8 or CuZn25Al5) or cast iron as the matrix, with solid lubricants (graphite or MoS₂ compounded with metal powder) embedded in the friction surface in a specific density and arrangement. During operation, the embedded solid lubricants migrate to the friction surface under frictional heat and shear forces, forming a stable solid lubricating film between the journal and bearing. Embedded self-lubricating bearings suit heavy-load, low-speed, high-temperature, hard-to-maintain applications such as metallurgical equipment, mining machinery, large valves and marine equipment. NMT embedded self-lubricating bearings allow loads up to 100-500N/mm² with operating temperature range of -40℃ to 300℃ (copper base), up to 500℃ with special formulations.

 

All-Plastic Self-Lubricating Material System——All-plastic self-lubricating bearings suit light-load, corrosive environment and clean environment applications. NMT all-plastic self-lubricating bearings are manufactured from high-performance engineering plastics (PA, POM, PEEK, PI, etc.) by injection molding or machining, with solid lubricants (PTFE, graphite, MoS₂, etc.) uniformly distributed inside the material. All-plastic bearings require no metal backing, offering lightweight, non-magnetic and corrosion-resistant properties, suitable for food machinery, medical devices, chemical equipment, electronic equipment and applications requiring high cleanliness and corrosion resistance. NMT all-plastic self-lubricating bearings allow loads up to 10-150N/mm² (depending on material) with operating temperature range of -40℃ to 260℃ (PEEK/PTFE).

 

Solid Lubricant Transfer and Control Technology——The core of self-lubricating bearing performance lies in the continuous and stable supply of solid lubricant. NMT self-lubricating bearing solid lubricants (PTFE, graphite, MoS₂, etc.) undergo precise particle size control and formulation optimization to continuously and uniformly transfer to the friction surface during operation, forming a stable transfer film. Lubricant transfer rate is closely related to journal material, surface roughness, load and speed. NMT provides detailed mating journal design recommendations——journal material should be stainless steel or chromium-plated steel with surface hardness ≥HRC50 and surface roughness Ra=0.2-0.8μm. Excessive surface finish is detrimental to lubricant film adhesion, while insufficient surface finish increases wear. NMT provides optimal self-lubricating material selection and mating journal design recommendations based on specific operating parameters (load, speed, temperature, environment).

 

Maintenance-Free Long-Life Design——The core value of self-lubricating bearings lies in their full-life maintenance-free characteristic. NMT self-lubricating bearings undergo activation treatment of self-lubricating materials before shipment, requiring no external lubrication, no periodic greasing and no maintenance inspection after commissioning. Under normal operating conditions, NMT self-lubricating bearing wear life can reach thousands to tens of thousands of hours, depending on load, speed, temperature and mating conditions. Self-lubricating bearing wear rates are predictable, allowing users to forecast replacement cycles for planned maintenance. NMT self-lubricating bearing friction coefficients remain stable throughout the full service life, without sudden changes from grease aging or bleed-out.

 

Corrosion Resistance and Hygienic Design——Self-lubricating bearings are widely used in corrosive environments such as food, medical and chemical applications. NMT self-lubricating bearing substrate materials and lubricant materials are all corrosion-resistant optimized. Composite bearing steel backs are zinc-plated, chromium-plated or stainless steel treated to resist moisture and chemical attack; polymer self-lubricating layers have good resistance to water, steam and acid/alkaline solutions. Embedded bearing copper alloy matrices have good inherent corrosion resistance, with embedded solid lubricants remaining chemically stable in corrosive media. All-plastic bearings offer the best corrosion resistance for strong acids, strong alkalis and organic solvent environments. For food and medical equipment, NMT offers self-lubricating bearing solutions meeting food contact safety and biocompatibility requirements, with materials certified for relevant safety standards.

 

Low-Noise and Vibration-Damping Design——Self-lubricating bearings do not generate rolling noise from rolling bearings, offering inherent low-noise characteristics. NMT self-lubricating bearings minimize friction noise and vibration during operation through optimized tribological properties of self-lubricating materials and precise bearing-to-journal fit clearance control. The damping characteristics of self-lubricating materials effectively absorb micro-vibrations, making equipment operation smoother. Self-lubricating bearings require no grease, avoiding noise and functional anomalies from grease hardening at low temperatures or bleed-out at high temperatures, maintaining consistent friction characteristics across wide temperature ranges.

 

Wide-Temperature-Range Adaptability——Self-lubricating bearings operate in various temperature environments from extreme cold to high heat. NMT self-lubricating bearings offer different temperature capabilities based on material systems. Composite type operates from -40℃ to 120℃; embedded copper-based type from -40℃ to 300℃ (up to 500℃ with special formulations); all-plastic PEEK/PTFE type from -40℃ to 260℃. Self-lubricating bearings require no grease, eliminating issues of grease solidification at low temperatures or bleed-out at high temperatures, maintaining stable friction performance across the full temperature range. During low-temperature start-up, self-lubricating bearing start-up torque is far lower than grease-lubricated bearings, particularly suitable for aerospace, cryogenic storage and other extreme cold applications.

 

Diverse Product Range——NMT self-lubricating bearings offer diverse product ranges for different application scenarios and operating conditions. Composite self-lubricating bearings (SF type)——Steel back + PTFE/POM self-lubricating layer, suitable for medium loads, low-to-medium speeds and general applications. Embedded self-lubricating bearings (JDB type)——Copper matrix + graphite/MoS₂ embedded, suitable for heavy-load, high-temperature, low-speed applications. All-plastic self-lubricating bearings (PS type)——PEEK/PA/POM and other engineering plastics, suitable for light-load, corrosive and clean environments. Self-lubricating linear bearings (SLL type)——Combining self-lubricating materials with linear motion guidance, suitable for maintenance-free linear motion systems. Self-lubricating spherical plain bearings (SJJ type)——Combining self-lubricating materials with spherical plain bearings, suitable for maintenance-free oscillating and tilting mechanisms. All product ranges are available in standard sizes and custom designs, with NMT providing precise bearing selection and material recommendations based on specific operating parameters.

 

Why Choose NMT Self-Lubricating Bearings?

 

Compared to conventional bearings and industry-standard self-lubricating bearings, NMT self-lubricating bearings offer distinct advantages:

 

Composite/embedded/all-plastic three material systems for different loads and temperatures

 

Continuous solid lubricant transfer for no external lubrication required

 

Full-life maintenance-free with no periodic greasing or inspection

 

Stable friction coefficients with no grease aging or bleed-out issues

 

Composite type 50-250N/mm² load, -40℃ to 120℃ range

 

Embedded type 100-500N/mm² load, -40℃ to 300℃ (up to 500℃)

 

All-plastic type 10-150N/mm² load, -40℃ to 260℃ range

 

Corrosion-resistant steel back/copper base/all-plastic for humid and corrosive environments

 

Inherent low-noise characteristics with damping for micro-vibration absorption

 

Wide-temperature stable friction with low start-up torque at low temperatures

 

SF/JDB/PS/SLL/SJJ multiple series for different operating conditions

 

Food contact safety and biocompatibility options available

 

Mating journal design recommendations for optimal matching performance

 

Passed wear, load, temperature and corrosion resistance testing

 

These performance advantages establish NMT self-lubricating bearings as the core precision components for food machinery, medical devices, packaging machinery, automotive mechanisms, office equipment, valves/pumps and various maintenance-free oil-free lubrication systems.

 

Application Scenarios

 

Food processing conveyor chain bearings

 

Medical device precision adjustment mechanism bearings

 

Packaging machinery high-speed reciprocating motion bearings

 

Automotive seat and window adjustment mechanism bearings

 

Office equipment drive and adjustment bearings

 

Chemical equipment corrosion-resistant bearings

 

Valve and pump self-lubricating bearings

 

Textile machinery oil-free lubrication bearings

 

Precision Manufacturing

 

Produced strictly according to ISO precision standards and self-lubricating bearing manufacturing specifications, with zero-defect quality execution, NMT self-lubricating bearings utilize high-strength steel strip/copper alloy/engineering plastic materials, processed through precision composite/casting/injection molding, precision solid lubricant embedding/mixing, precision self-lubricating layer forming, precision bearing machining, fit precision inspection, friction coefficient testing, wear life testing, temperature performance testing and corrosion resistance testing. Every product is processed through fully automatic machining and inspection in temperature-controlled clean workshops, with critical dimensional tolerances strictly controlled—ensuring maintenance-free, long-life and oil-free lubrication reliability.

 

Product Range

 

Composite self-lubricating bearings (SF type)

 

Embedded self-lubricating bearings (JDB type)

 

All-plastic self-lubricating bearings (PS type)

 

Self-lubricating linear bearings (SLL type)

 

Self-lubricating spherical plain bearings (SJJ type)

 

Food-grade self-lubricating bearings

 

Custom non-standard self-lubricating bearings

 

Global Industrial Service

 

Japan NMT supplies high-quality self-lubricating bearings to global food machinery manufacturers, medical device companies, packaging machinery suppliers and maintenance-free industrial users. With maintenance-free oil-free lubrication precision engineering and long-term stable reliable performance, NMT continuously empowers long-term reliable operation of equipment where maintenance is impossible and lubrication is prohibited.