40GHz, 2.92mm Female Connector With 4-Hole Flange (9.5mm*9.5mm)
The 2.92mm connector (also known as Type K, SMK, or KMC) is a precision coaxial RF connector standardized under IEC 61169-35 and IEEE 287. Its name derives from the 2.92mm inner diameter of the outer conductor, with a 50Ω characteristic impedance and 1/4-36UNS-2 inch threaded coupling mechanism.