SM4263 is an SMA female to N male adapter from Fairview Microwave designed to enable connections between two incompatible connector types. The adapter features a straight body geometry with 50 ohm impedance and operates across a frequency range from DC to 18 GHz with a maximum VSWR of 1.3:1. Both connectors utilize beryllium copper contacts with 1.3 µm minimum gold plating, PTFE insulation, and passivated stainless steel outer components, ensuring reliable performance and durability. The adapter is rated for operating voltages up to 335 Vrms (AC) and dielectric withstand voltage of 1,000 Vrms, with an operating temperature range of -45°C to +120°C. Common applications include between-series connections, general-purpose RF testing, and connector protection on expensive equipment subject to frequent connect/disconnect cycles.