The TE Connectivity 1060985-1 is an MCX receptacle, female socket, designed for 50 Ohm RF signal paths. The 6 GHz frequency ceiling and 0.1 dB insertion loss keep the signal clean across the band, and the 500 mating cycles mean this jack can handle repeated connect-disconnect in test or field-service setups without degrading the contact.
The center contact is beryllium copper with gold plating — the beryllium copper gives spring retention after repeated mates, and the gold keeps oxidation off the RF signal path.