IEC 60169-10:1983
Radio-frequency connectors. Part 10: R.F. coaxial connectors with inner diameter of outer conductor 3 mm (0.12 in) with snap-on coupling - Characteristic impedance 50 ohms (Type SMB)
Concerns patterns for r.f. coaxial connectors which may preferably be used with r.f. cables 96 IEC 60050-1 or 96 IEC 60050-2 of IEC 60096-2: Radio-frequency cables, Part 2: Relevant cable specifications. These connectors are for low power. They have a snap-on coupling mechanism and are commonly known as Type SMB.