What are bearing bolts?

Bearing bolts are mechanical connecting elements that are used as axes or guides within assemblies. They are used to support and position moving components and transmit forces while maintaining freedom of movement in defined directions. In most cases, bearing bolts enable rotary and/or axial movement around/along an axis. In contrast to screws, bearing bolts are not primarily used for fastening, but rather for stable support and guidance of movements. In the form of Rubber-metal- or Rubber-plasticcomponents, elastic solid-state joints can be realised for small movements.

 

Typical designs are

  • Cylindrical bolts: standard design with uniform diameter
  • Stepped bolts/shoulder bolts: with different diameters for defined axial positioning
  • Bolt with threaded end: for secure fastening with nut or locking element
  • Rubber-mounted bearing pins: for vibration decoupling and noise reduction or as solid-state joints

 

Bearing pins are essential elements in constructions where rotating, oscillating or linear movements occur. They have to withstand high mechanical loads, alternating forces and environmental influences without wearing out or coming loose. Bearing bolts are usually made from hardened steels or stainless alloys. For special applications, coated, ground or surface-treated variants are used to minimise corrosion and friction.

 

Functions and applications of bearing bolts

Bearing bolts ensure the mobility of assemblies and transfer forces between connected components. In combination with Elastomer or plastic elements they also enable damping, noise-reducing and maintenance-free bearing concepts:

  • Power transmission: Transmission of axial and radial forces
  • Guidance: precise centring of moving components
  • Bearing: defined turning or swivelling movements with minimal play
  • DampingReduction of shocks and vibrations in combination with rubber elements
  • Safety: Ensuring reproducible movement sequences

 

Typical applications:

  • Mechanical and plant engineering: Pivot and hinge points in levers, cylinders or guide systems
  • Vehicle technology: elastically mounted suspensions, shock absorber connections, steering and axle connections
  • Agricultural and construction machinery: Joints for hydraulic cylinders and movement mechanisms
  • Aviation and defence: high-precision bearing points with minimal play
  • Conveyor technology: Axes and roller bearings with a defined angle of movement
  • Medical technology and precision mechanics: compact bearing points with tight tolerances

 

By using bearing pins, movements can be guided precisely, wear reduced and assemblies made more durable. In many cases, they are part of a Rubber-metal connection, which integrates elastic mounting and vibration decoupling.

 

Components and materials of bearing bolts

The design and material selection of a bearing bolt depends on the load, environment and area of application. In addition to strength and wear behaviour, the surface quality also plays a decisive role in the service life.

 

Typical materials:

  • Heat-treated steel: high strength, low wear, standard in mechanical engineering
  • Stainless steelCorrosion-resistant, suitable for damp or hygienic environments
  • AluminiumLightweight and low-corrosion, for applications with lower loads

 

Surface treatments:

  • Galvanising or nickel plating: corrosion protection
  • Nitriding or induction hardening: increased wear resistance
  • PTFE or molybdenum coating: friction reduction and dry-running resistance

 

So that bearing bolts in Rubber or plastic composites To achieve optimum properties, they can be designed to improve durability, mountability and function:

  • Fitting surfaces or guide heels for precise positioning
  • Lubrication grooves or holes as lubricant reservoirs
  • Press-fit or threaded ends for easy installation
  • Elastomer or plastic bearing sleeves for vibration decoupling
  • Corrosion protection coatings for use in outdoor or wet environments