What Is Four-Point Contact Linear Guide?

A Four-point contact linear guide is a type of linear motion guide in which each rolling element makes contact with the raceways at four points. In IKO Linear Ways, a two-row, four-point contact ball arrangement is employed across all series, allowing for stable and precise linear motion under multi-directional and fluctuating loads.

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How Four-Point Contact Works

• Each ball contacts the raceway at four distinct points

• Loads applied from any direction are distributed evenly

This structure allows a Slide Unit to handle combined loads and moment loads.

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Advantages of Four-Point Contact Linear Guides

A Four-point contact linear guide offers several technical advantages:

• High rigidity in all directions

• Stable accuracy under changing load conditions

• Smooth and consistent motion due to balanced load distribution

• Compact design, suitable for space-constrained systems

These characteristics make Four-point contact linear guides ideal for precision equipment where both accuracy and mechanical stability are critical.

 

Four-Point Contact in Micro Linear Guides

Through advanced design know-how and manufacturing technology, IKO applies Four-point contact geometry even in micro-scale linear guides. This enables high positioning accuracy and smooth motion in extremely compact mechanisms. IKO Micro Linear Way L series, developed using proprietary small-sizing technology, is available with track rail widths from 1 mm to 6 mm, supporting highly precise micro-positioning applications.

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Dimensional Accuracy and Structural Simplicity

The simple two-row, four-point contact structure minimizes the influence of machining tolerances and measurement errors. As a result, the raceways can be maintained with high dimensional accuracy, contributing to repeatable precision and long-term performance stability.

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Typical Applications

Four-point contact linear guides are commonly used in:

• Precision positioning systems

• Semiconductor and electronics equipment

• Medical and analytical devices

• Compact automation and inspection systems