HARTING 0903 000 6160 射频/同轴连接器, 金属触芯, 直型插头, 焊接, 50 ohm
The is a Coaxial Contact for type M connectors, DIN 41612 series. Turned male contacts, 50R for female connectors for straight solder/crimp termination.
Newark:
# HARTING 0903 000 6160 RF / Coaxial Connector, Contact, Straight Plug, Solder, 50 ohm