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Microdot Coaxial ISO Feedthrough Flanges

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Microdot ISO Feedthroughs

Diagram of Microdot coaxial feedthroughs on CF flanges

Microdot ® Threaded Coaxial Interface

The Microdot ® coaxial interface, developed for aerospace and instrumentation applications, is a small circular connector, which is sometimes mistaken for the slightly larger SMA coaxial connection. In its most common configuration, the S-50 series (the feedthroughs offered herein), it uses a No. 10-32 UNF (.190-32) thread. Male connectors are fitted with a .030/.033 diameter pin and jacks have the female mating socket receptacle. It is commonly used in conjunction with high-frequency, low noise, 50-ohm instrumentation signal lines in accelerometers, and various transducer applications. Accu-Glass Products' Microdot ® and 'between-series' BNC-Microdot ® coaxial feed­throughs are constructed with grounded shields, where the feedthrough shield and flange are electrically common.

BNC-Microdot ® 'between-series' feedthroughs offer a simple means of transitioning between BNC and Microdot ® wired applications, or vise versa. The BNC-Microdot ® feedthrough is often used in conjunction with crystal sensors to monitor deposition thicknesses of in-vacuum coating applications. Microdot ® cable assemblies, connectors, and wiring accessories are also offered. Threaded, mating male and female, coaxial connectors are available.


  • Microdot ® and BNC Coaxial Interfaces
  • Single and 'Between Series' Configurations
  • Kapton® insulated, 50-Ohm cables
  • High temperature rated to 250°C
  • UHV compatible construction
  • Conflat® and ISO KF compatible mounts
  • Air service cables/connectors
  • Custom solutions on request

mating warning diagram on SMA and Microdot S93 threads