Product sheet
Category sheet
Ground centering spacer
  • 35 million casings designed each year
  • Co-designer of custom fasteners for 100 years and manufacturer of standard products
  • From M6 to M10 and from 8 mm to 30 mm (inner Ø suitable for screw passage)
  • Steel, stainless steel, brass, etc. (other materials available on request).

A bushing designed for precise centering and alignment of assembly components. Frequently used for centering two half-cases (drive belt casing, bearing centering, gearbox casing, cylinder head, pump...).

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Ground bush - Centering bush - Positioning bush

Recognized design, manufacturing and improvement methods
Our customers and their applications

Ground bush - Centering bush - Positioning bush

Today, we produce the fasteners of tomorrow
From design to mass production of your parts
Co-design and development
Working closely with LGC's design engineers, you will define the project's specifications, technical requirements and constraints.
  • Feasibility checks using the FMEA tool, which is used to analyze failure modes, their effects and criticality.
Prototyping and Testing
Once the concept has been approved, the project team creates physical prototypes using a 3D machine and simulation software such as SolidWorks Premium and Spacerclaim.

  • Production of initial samples in medium series, and validation of production with PPAPs in accordance with IATF 16949.
Industrialization and Production
The production process is validated according to the production control plan drawn up by a multi-disciplinary team. 

  • Development of detailed production processes according to the APQP quality process
Assessment and Improvement
After 3 to 6 months of series production, an assessment based on the criteria required by IATF 16949 verifies 100% project conformity.
  • Collection and analysis of production data to identify trends and variations. 3PPM in 2023.
Production to support you

The advantages of manufacturing with LGC Industries

Fastening expertise from a certified manufacturer
precision engineering machines
  • 24 Multi-spindle lathes
  • 45 Tours Escomatic
  • 42 Banding machines
  • 8 Plunge and enfilade grinders
LGC Industries designs and produces over a million parts every day
Technical information about this product
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Optimize your assemblies with a ground bushing

Ground spacers commonly referred to as "positioning bushes " or " centering bushes" play an essential role in mechanical engineering and industrial assembly. They ensure the precise positioning of components, reducing the risk of part distortion or uncontrolled movement. These small positioning elements are often neglected, which in some cases can lead to a reduction in the overall performance of a mechanism.

The ground or centering bush is the jewel in the assembly crown. The ground bushing ensures perfect alignment of parts, eliminating unwanted gaps and friction. Frequently used in complex mechanical systems, this small cylindrical part will become the keystone of your assembly precision.

What is a ground bushing?

Ground centering bushes are extremely precise cylindrical assembly elements specifically designed to ensure the centering and precise positioning of 2 components in an assembly.

Their innovative design avoids any risk of tangling, which is essential for automated assemblies. Thanks to our specialized production facilities, we can guarantee a quality level close to zero defects, 0 PPM.

Unlike a pin or centring pin, the ground bushing can accommodate a through-bolt, offering greater application flexibility.

How are LGC ground bushings manufactured?

There are two different methods for creating a socket

From pin to ground bush

It is possible to start with a solid material that has been machined into a pin. In this case, it is necessary to drill a pin to make it hollow, a process known as reaming, which complicates the process both financially and technically, as well as environmentally.

From tube to ground bushing

In a second case, a positioning sleeve can be produced from a tube. 

The use of a tube is highly recommended, as it perfectly meets all the criteria (precision, price, quality and also carbon footprint).

This is the technique we use at LGC.

The first step in manufacturing a bushing is to cut the raw material.

The raw material comes in the form of long hollow tubes. 

Material and diameter depend on the final part required. 

The tube enters a machine which cuts it to the desired length.

The bushing can be further machined on specialized machines.

For example, chamfers may be required or finishes applied to the material. 

The bushing then goes through a grinding stage.

A roller presses the parts against a high-speed grinding wheel. 

It is the grinding wheel which, through abrasion, modifies the diameter of the part to achieve precise tolerances of a few microns (~5-6 μm).

What are the advantages of using a ground bushing?

  • Dimensional accuracy: a ground bushing guarantees impeccable dimensional accuracy. By creating a uniform gap between components, the ground bushing eliminates potential errors linked to dimensional or alignment discrepancies between 2 parts.

  • Structural stability: the ground cylindrical bushing, with its robust shape, provides exceptional structural stability. It resists vibration and mechanical loads, ensuring optimum performance under demanding conditions. That's why it's found in virtually all our vehicles' engines. 

  • Reduced friction: thanks to its intelligent design and the grinding process, the ground bushing minimizes friction between moving parts. The result is reduced wear and extended component life.

Would you like to know more about the manufacturing process of our sockets?

Visit our dedicated article: All you need to know about LGC sockets

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