The 134-1018-031 is an SMA jack to MCX plug between-series RF adapter designed for high-frequency signal transmission. It features a 50-ohm characteristic impedance across a 0–6 GHz frequency range with a maximum VSWR of 1.03, ensuring minimal signal reflection and loss. The adapter is constructed with brass gold-plated body, beryllium copper gold-plated contacts, and TEFLON insulation, providing excellent electrical performance and environmental durability. It operates at a maximum working voltage of 335 VRMS at sea level with a dielectric withstanding voltage of 1000 VRMS, and achieves an insertion loss of 0.1 dB maximum at 1 GHz. The mechanical design includes 1/4" wrench flats for easy handling, an engagement force of 5.6 lbs maximum, and a contact retention force of 6 lbs minimum, with a durability rating of 500 mating cycles. This adapter is ideal for RF/microwave test equipment, communications systems, and laboratory applications requiring reliable impedance-matched connections across the microwave frequency spectrum.