U-229

The U-229 is a cable connector currently used by the U.S. military for audio connections to field radios, typically for connecting a handset. There are five-pin and six-pin versions, the sixth pin version using the extra pin to power accessories. This type of connector is also used by the National Security Agency to load cryptographic keys into encryption equipment from a fill device.

This article is about an electrical connector. For the WWII U-boat, see German submarine U-229. For the isotope of uranium, see Uranium-229. For the Swedish runestone, see Gällsta Runestones.
Front panel of KY-57 showing U-229 series fill connector in center.

It is specified by the detail specification MIL-DTL-55116D .

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