Vacuum suitable screws with lowest magnetizability

Vacuum suitable screws with lowest magnetizabilityVirtual leaks and gas desorption within vacuum chambers lead to prolonged pump down times and higher ultimate pressures. Virtual leaks are mainly caused by the use of unsuitable materials, contaminations but also by trapped gas. Vacuum suitable screws have a centric vent hole through which the gas can escape when the vacuum chamber is being evacuated. They are cleaned entirely grease and oil free and show very low outgassing rates, as required for precision-cleaned stainless steel components.

Typically, stainless steel AISI 304 or AISI 316 is used for vacuum suitable screws. The screw threads are  manufactured using cold forming, since this is the only way to achieve the required strength of 700 MPa. At the same time, however, the magnetization of the screw increases with this technique. In many vacuum applications such as synchrotrons, fusion reactors, in electron beam lithography or at various analytical techniques such as SEM, TEM or FIB magnetizable components can cause  interferingeffects. So far, in cases like these fasteners made of special materials like titanium had to be used. Now, VACOM also offers vacuum suitable screws made of stainless steel AISI 316L. The composition of this particular material is chosen in a way that even severe cold forming results in only a minimal increase of the magnetic permeability. These screws can therefore be used in a magnetic field without influencing the field lines significantly.

Vacuum suitable screws made of stainless steel 316L:

  • minimum tensile strength 800 Mpa
  • magnetic permeability µr < 1,008
  • with vent hole
  • cleaned and packaged to meet UHV standards

Online bestellenPurchase our vacuum suitable screws in the VACOM Online Shop.

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