2.92mm (K) Connectors are RF/Microwave coaxial connectors with a mode-free operating range of 40 GHz. SMA and 3.5mm connectors are compatible with these connectors. Mario Maury first created the 2.92mm connectors in 1974, and Wiltron reintroduced them in 1984 as the K connector. These connectors are IEC 61169-35 specified and are perfect for high-frequency module and T&M applications. The 2.92mm Series c has a frequency range of 40 GHz.