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SPI Supplies will be closed on Monday, May 30 for Memorial Day. All orders placed during the long weekend will be processed on Tuesday, May 31

Returning customer? Request an account for our new website on the contact form.


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The SPI Supplies apertures, be they drilled Pt or Mo or of the gold foil thin firm type, are all made to the most exacting of standards and with the smallest possible tolerances, not just in hole size, but also placement.

  • ZEISS® / LEO® - 2mm O.D. x 0.1mm thick and 10mm O.D. x 0.1mm thick and 12mm O.D. x 0.1mm thick
  • JEOL® / Leica® / Cambridge®* / Siemens/LEO®/Cameca® - 2mm O.D. x 0.6mm thick
  • LEO® / Nanolab® / Novascan® / Zeiss® - 3mm O.D. x 0.1mm thick
  • AMRAY® / AEI / Electroscan® / FEI/Philips*/Cambridge S-600/JEOL®/Leitz® - 3.04mm O.D. x 0.25mm thick
  • CAMSCAN® / TOPCON® / ISI / ABT - 4mm O.D. x 0.2mm thick
  • ETEC® / Autoscan® / Perkin Elmer - 6.35mm O.D. x 0.125mm thick
  • Hitachi Scientific Instruments/ Nissei Sangyo - 6.5mm O.D. x 0.2mm thick

Be aware of the additional information, including tolerances, that is available about SPI's disc apertures.
Items in Apertures