Connector having a receptacle and a plug with a pair of locking pieces with a pair of locking hooks

A connector having a plug capable of housing one internal connector as an outer shell and a receptacle capable of housing another internal connector as an outer shell, the plug and the receptacle being connected to each other, the one internal connector and the other internal connector being connected to each other, wherein

• the receptacle includes a cylindrical part and a flange formed at one end of the cylindrical part,
• the plug includes a cylindrical barrel that houses the one internal connector and a coupling nut that is disposed on an outer circumference of the barrel and movable along an axial direction of the barrel,
• an engaging piece and a pair of locking pieces project in the axial direction from an end of the barrel, the pair of locking pieces facing each other in a diameter direction of the barrel, and a pair of locking hooks project outwardly from each other from the respective tips of the pair of locking pieces, the engaging piece and the pair of locking pieces being inserted into and engaged with the cylindrical part by the pair of locking hooks so as to be positioned on an inner surface of the cylindrical part, the pair of locking pieces being secured to the receptacle by the pair of locking hooks so that the plug is temporarily secured to the receptacle, and
• the plug and receptacle are connected to each other when the coupling nut is screwed onto threads formed on an outer circumference of the cylindrical part.