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Standard Precision
Round Apertures

Standard Pin Hole Apertures

Substrate Specifications

Finish: Unblackened (see options below)

Material: 300 series stainless steel (except for HS option)

Diameter: 3/8 inch (0.3753 inch max.), 9.53mm


Positional Tolerance: ø.006 inch (0.152mm)

Thickness: 0.0005 inch (12.7µm) on holes 5µm and up.
NOTE: Holes 0.5µm to 3.0µm include the HS option with a 2µm to 5µm thin Ni at the hole region.

Instant Quote Form

Standard Round Apertures

(3µm and smaller come with HS)

Option Cost
For Calibration please contact sales
 Mounted (M-)

(Calculated price includes discounts applied, if applicable.)
Shipping/handling: $10 charge within USA, ground for small packages (standard items). You may also provide your own UPS or FedEx account number. Charges are billed separately.
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The "Review & Confirm" button will give you the option to either Buy Now or Create a Purchase Requisition

if you need the following:

  • Unlisted size
  • Quantities over 50
  • Non-standard substrate

The information contained in this website is subject to change without notice. Critical dimensions or specifications should be verified with our technical support staff.

Aperture Quality Standards

Roundness: Max, Major axis - Minor axis

  • ‹0.5µm on holes under 20µm
  • ‹1.0µm on holes 20-50µm
  • ‹2.0µm on holes 51-300µm
  • ‹3.0µm on holes 301µm and up


Edge Finish:Optical research quality

  • ‹20µ-inch, on holes 5µm to 30µm
  • ‹40µ-inch on holes 31µm to 100µm
  • ‹60µ-inch on holes 101µm to 200µm
  • ‹80µ-inch on holes 201 to 300µm
  • ‹120µ-inch on holes 301µm and up
NEW buying option!! Now you can send your list of items directly to your purchasing manager rather than complete the transaction yourself!! Learn More

Aperture Mounts

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25mm diameter blackened aluminum mount

  • D=24.95mm
  • T=2.54mm
  • ID=7.3mm
  • L= 0.63mm


18mm diameter blackened aluminum mount

  • D=17.95mm
  • T=2.54mm
  • ID=7.3mm
  • L= 0.63mm


16mm diameter blackened aluminum mount

  • D=15.95mm
  • T=1.8mm
  • ID=4.0mm
  • L= 0.46mm


1.0 inch diameter blackened aluminum mount

  • D=0.998in.
  • T=0.100in.
  • ID=0.290in.
  • L= 0.025in.


0.5 inch diameter blackened aluminum mount

  • D=0.498in.
  • T=0.055in.
  • ID=0.290in.
  • L= 0.018in.