This standard provides the requirements of WB series glass beads with 50© impedance for RF connectors, including the structure dimensions, IEC type designation, rating and characteristics and quality assessments, etc. These glass beads are used for adaption of coaxial systems to microstrip circuits extensively in microwave communication systems such as TR modules, power modules, integrated circuits and etc. where hermetic seal is required. They can serve as a part of an RF coaxial connector, multi-channel RF connector or hybrid connector, or can be applied directly in various communication module systems as an independent product. They provide 50© normative impedance with operating frequency limit up to 65 GHz.