Patent ID: 8920044

Claim:
A plug to be coupled to a receptacle having a mating optical connector housed therein, the plug comprising: main optical connector bodies attached to an end of an optical cable; a cylindrical housing for securing and holding the main optical connector bodies on a connecting end side thereof and securing and holding at a rear end thereof the optical cable drawn out of the rear end; a cylindrical inner shell surrounding the housing and having at a rear end thereof a rear wall portion with a threaded hole formed therein, the inner shell being attached to the housing by screwing the threaded hole onto threads formed in an outer periphery of the housing; and a cylindrical outer shell surrounding the inner shell and having a thread formed in an inner periphery thereof on the connecting end side and a step portion formed protrudingly from the inner periphery on a rear end side thereof, the thread being screwed onto a thread formed in the outer periphery of an enclosure shell of the receptacle; wherein, when the plug is coupled to the receptacle, the inner shell is rotated with respect to the housing and a connecting end thereof hits an abutment surface provided in an inner periphery of the enclosure shell, and when the outer shell is screwed onto the enclosure shell, the step portion hits the rear wall portion.