Linear Guide Runner Blocks for Extreme Industrial Environments

Bosch Rexroth has expanded its portfolio of linear motion technologies with the introduction of the NRTVG runner block for BSHP ball rail systems. Engineered entirely from corrosion-resistant steel, the size 25 runner block is designed to operate in high-vacuum environments, extreme temperatures, and industrial settings exposed to aggressive chemical media.

Vacuum Compatibility and Temperature Tolerance
The NRTVG (Temperature Vacuum Graded) runner block supports a temperature operating range from -30 °C to 200 °C, making it suitable for deep-freeze logistics as well as high-heat applications like glass production and foundries. For high-vacuum environments frequently required in semiconductor and display manufacturing, the block accommodates atmospheres up to 10⁻⁷ mbar. To prevent virtual leaks and maintain vacuum integrity, the block features two vent holes on each side, allowing trapped air from the installation process to escape rapidly.

All-Metal Architecture and Modular Sealing
Manufactured utilizing advanced metal injection molding (MIM) processes, the ball guide contains no plastic components, fulfilling a strict requirement for sensitive cleanroom production processes. To address aggressive media, the system offers optional fluororubber (FKM) seals capable of withstanding constant temperatures up to 150 °C while resisting industrial oils and chemicals. Additionally, a pre-fitted cover plate wiper made of corrosion-resistant steel is available to protect the internal ball recirculation paths from coarse contamination, such as metal chips. The modular BSHP design allows the guide rail and runner block to be replaced independently, minimizing maintenance overhead.

Additional Context: This section details technical specifications not included in the original announcement
In high-vacuum (HV) and ultra-high-vacuum (UHV) environments—such as semiconductor photolithography or OLED physical vapor deposition (PVD)—standard industrial plastics and lubricants cannot be used because they vaporize (outgas). This outgassing contaminates the vacuum chamber and deposits microscopic defects onto silicon wafers or glass substrates. The use of Metal Injection Molding (MIM) for the NRTVG's ball recirculation elements eliminates the need for the standard plastic resin end-caps and recirculation tubes typically found in conventional linear rails. Furthermore, because standard petroleum-based lubricants boil off in a vacuum, causing immediate metal-on-metal seizing, all-metal linear guides in these environments must utilize specialized vacuum-compatible solid lubricants (such as molybdenum disulfide, MoS₂) or low-vapor-pressure perfluoropolyether (PFPE) greases to achieve their rated travel life.

Edited by Lekshman Ramdas, Induportals editor – adapted by AI.

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