The 7-16 series metric dimensions of the connector interface: 7mm OD of inner contact, 16 mm ID of outer contact. Provide superior performance for both return loss and intermodulation distortion (IMD).7-16 connector is very robust, extremely stable, and waterproof, It is an ideal choice for anti-vibration and environmental protection applications. They have a pre-assembled gasket that protects against dust and water (IP68) per IEC 169.
DIN 7/16 Connector Interface