Flat Head Bolt Type Oilless Bearing: Enhancing Industrial Applications

Oilless bearings, also known as self-lubricating bearings, are designed to operate efficiently without the need for external lubrication. These bearings leverage their material properties or structural design to achieve effective lubrication, making them ideal for applications where maintenance is challenging or cleanliness is paramount.

Working Principles of Oilless Bearings

Oilless bearings function through several mechanisms:

  1. Solid Lubrication: Materials like graphite or PTFE (polytetrafluoroethylene) are embedded within the bearing. These substances provide lubrication during frictional contact.
  2. Fluid Lubrication: Bearings may incorporate oil reservoirs that form a lubricating film during operation, reducing friction.
  3. Boundary Lubrication: In conditions of low speed or high load, a thin film forms on the bearing surfaces through physical adsorption or chemical reactions, minimizing friction.

Advantages of Oilless Bearings

  • Simplified Maintenance: Eliminates the need for regular lubrication, lowering maintenance costs.
  • Hygienic: Suitable for industries like food and pharmaceuticals where cleanliness is critical.
  • Long Lifespan: When used under appropriate conditions, these bearings offer extended service life.

Flat Head Bolt Type Oilless Bearing

Flat head bolts are common fasteners characterized by a flat top design, providing a large contact area. Combining oilless bearings with flat head bolts results in a novel fastening and support structure, advantageous in specific applications.

Flat head bolts bearing Flat Head Bolt Type Oilless Bearing

Benefits of Combining Oilless Bearings and Flat Head Bolts

  • Simplified Design: Integrating the bearing and fastener reduces the number of components and simplifies the assembly process.
  • Enhanced Reliability: Flat head bolts deliver stable fastening force, while oilless bearings ensure smooth operation of moving parts.
  • Versatility: This integrated structure adapts to various working environments and load conditions.

Design Considerations

When designing a structure that combines oilless bearings with flat head bolts, several factors must be considered:

  • Material Selection: Choose appropriate materials for both the oilless bearing and the flat head bolt to meet specific application requirements.
  • Dimensional Compatibility: Ensure that the inner diameter of the oilless bearing matches the outer diameter of the flat head bolt for a proper fit.
  • Load Capacity: Evaluate the load capacity of the integrated structure to ensure it can withstand the expected operational loads.

Applications and Benefits

This innovative combination can be developed for a variety of industrial applications, enhancing equipment efficiency and reliability. By leveraging the maintenance-free and clean operational benefits of oilless bearings along with the stable and robust fastening properties of flat head bolts, industries can achieve significant improvements in their mechanical systems.

Advantage Of Flat Head Bolt Type Oilless Bearing

Flat head bolt type oilless bearings offer numerous benefits, making them a preferred choice in various industrial applications. Their unique design and material properties provide several advantages:

High Load Capacity

  • Durability: Oilless bearings typically have a high load-bearing capacity, allowing them to handle heavy loads and making them suitable for applications with significant or impact loads.

Impact Resistance

  • Shock Absorption: These bearings are designed to resist impact, performing well under sudden high-load conditions.

High Temperature Resistance

  • Heat Tolerance: Oilless bearings can withstand high operating temperatures, making them ideal for use in high-temperature environments.


  • Maintenance-Free Operation: The self-lubricating properties of oilless bearings enable them to function without external lubricants, reducing maintenance costs and complexity.

Corrosion Resistance

  • Durability in Harsh Environments: These bearings are resistant to water and other corrosive liquids, making them suitable for use in wet or chemical environments.

Cost Reduction

  • Operational Efficiency: The low maintenance requirements of oilless bearings help reduce operational costs and minimize the risk of equipment failure due to improper lubrication.

Noise Reduction

  • Quiet Operation: Oilless bearings can reduce noise generated by friction, providing a quieter operational environment.

Long Lifespan

  • Extended Durability: With reduced need for maintenance and lubrication, oilless bearings generally have a longer service life.

Ease of Installation

  • Simplified Assembly: The design of flat head bolt type oilless bearings makes them easy to install and maintain.

Lower Procurement Costs

  • Economical Choice: Reduced frequency of maintenance and replacement lowers overall procurement costs.

Increased Shaft Tolerance

  • Design Flexibility: Oilless bearings can accommodate greater shaft tolerances, offering more flexibility in design and manufacturing.

Environmental Benefits

  • Eco-Friendly: The absence of lubrication oil requirements helps reduce environmental pollution and the impact on ecosystems.

Flat Head Bolt Type Oilless Bearing Size Chart

Flat Head Bolt Type Oilless Bearing16-15(16*22*15/50*3Bolt Oilless Bearing20-20(20*28*20/50*5)
Flat Head Bolt Type Oilless Bearing16-20(16*22*20/50*3)Bolt Oilless Bearing20-25(20*28*25/50*5)
Flat Head Bolt Type Oilless Bearing16*25(16*22*25/50*3)Bolt Oilless Bearing20-30(20*28*30/50*5)
Flat Head Bolt Type Oilless Bearing16-30(16*22*30/50*3)Bolt Oilless Bearing20-35(20*28*35/50*5)
Flat Head Bolt Type Oilless Bearing16-35(16*22*35/50*3)Bolt Oilless Bearing20-40(20*28*40/50*5)
Flat Head Bolt Type Oilless Bearing18-15(18*24*15/50*3)Bolt Oilless Bearing25-15(25*33*15/55*5)
Bolt Oilless Bearing18-20(18*24*20/50*3)Bolt Oilless Bearing25-20(25*33*20/55*5)
Bolt Oilless Bearing18-25(18*24*25/50*3)Bolt Oilless Bearing25-25(25*33*20/55*5)
Bolt Oilless Bearing18-30(18*24*30/50*3)Bolt Oilless Bearing25-30(25*33*30/55*5)
Bolt Oilless Bearing18-35(18*24*35/50*3)Bolt Oilless Bearing25-35(25*33*35/55*5)
Bolt Oilless Baring20-15(20*28*15/50*5)Bolt Oilless Bearing25-40(25*33*40/55*5)

Bolt Oilless Bushings are widely used in electronic equipment, food equipment, packaging machinery, medical machinery, printing machinery instruments, robots, industrial machinery, CNC machine tools, automobiles, and digital THREE-DIMENSIONAL coordinate measuring equipment or special machinery industry.

Applications of Flat Head Bolts

Due to their simple structure, low cost, and ease of operation, flat head bolts are extensively used across various industries:

  • Construction Industry: For connecting and securing building structures.
  • Mechanical Manufacturing: Essential for assembling and fastening machinery.
  • Automotive Industry: Used for connecting and securing automotive components.
  • Furniture Manufacturing: Provides stable connections in furniture assembly.
  • Electronics: Used to secure internal structures in electronic devices.
  • Shipbuilding: Suitable for connecting ship structures, adapted for marine environments.
  • Aerospace: Used for fastening components in aircraft and spacecraft.
  • Agricultural Machinery: Important for the assembly and repair of agricultural equipment.
  • Medical Devices: Used for fixing and maintaining medical instruments.

Flat head bolts are indispensable in industrial production and everyday repairs due to their versatility and widespread applicability. Their ability to meet diverse requirements across different sectors highlights their fundamental role in modern engineering and manufacturing.

Material Selection and Manufacturing Process of Flat Head Bolt Type Oilless Bearings

Material selection is a critical step in the manufacturing process of flat head bolt type oilless bearings, as it directly impacts the performance and lifespan of the bearing. Here are some key considerations:

Bearing Materials

  • Load Capacity: Select materials that can withstand the expected loads, such as copper alloys like C93200 or C86300.
  • Solid Lubricants: Consider materials embedded with solid lubricants, such as composites containing PTFE or graphite, to ensure self-lubrication.

Surface Treatment

  • Corrosion Resistance: Choose appropriate surface treatment techniques like galvanizing, nickel plating, or Dacromet coating to enhance corrosion resistance and aesthetic appeal.


  • Material Compatibility: Ensure compatibility between bolt and bearing materials to avoid chemical reactions that could degrade performance.