Unguided linear motion

MPP series

Unguided linear motion solutions for low load applications in high/ultra-high vacuum. The vacuum shaft is free to rotate, avoiding possible conflict with an internal chamber mechanism. Available in CF16 and CF35 flanges and six stroke lengths from 50mm to 300mm. Manual, pneumatic and motorised actuation options with additional switches to prevent over-travel.

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MPPs provide linear motion of an unguided vacuum shaft (free to rotate). This is used to manipulate slides or pivot arms where a guided system may conflict with the mechanism. Please note that although the vacuum shaft is free to rotate, the MPP does not provide rotation. The range can be actuated manually, pneumatically or motorised with DC or stepper motors. Additionally, switches can be provided to prevent over-travel and to aid system interlocks.

The MPP range provides a simple and intrinsically safe alternative to bellows push pull systems. Utilising UHV Design’s magnetic coupling technology, the Magnetic Push Pull removes the need for edge-welded bellows stacks, incorporated within traditional push pull designs. Their elimination maximises vacuum integrity, providing a robust, cost-effective solution. Also, unlike a bellows-sealed device, the MPP is not subject to the thrust due to vacuum, resulting in smooth, free-moving operation.

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Key features

  • Unguided linear motion of the vacuum shaft
  • Vacuum shaft free to rotate
  • High power-to-size ratio
  • No bellows - smooth operation
  • No thrust due to vacuum
  • Over 90 N (20 lbf) linear thrust
  • Entire unit bakeable to 250°C
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Available Downloads  
MPP Technical Datasheet Download


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