The SMP-FS-C21-NM from Amphenol RF is a RF Connector with Frequency DC to 26.5 GHz, Operating Temperature -65 to 165 Degree C, Return Loss -32 to -20 dB, Voltage Rating 500 Vrms (Dielectric withstanding). Tags: Standard. More details for SMP-FS-C21-NM can be seen below.