Containing door lock pin

A container door lock pin comprising:

• a bolt including a head and a shank;
• the shank including a front portion which extends between a bolt front end and a first position spaced from the front end by a first distance, and a rear portion which extends between the first position and the head;
• the rear portion being larger in diameter than the front portion, the rear portion having a rear portion annular groove formed in its periphery at a second position spaced rearward from the first position by a second distance;
• a ring spring fitted in the groove;
• a nut having a bore for slidable engagement with the shank, the bore having a first annular groove formed near the nut front end;
• and
• an elastic rigid confirmation seal plate fitted in the first groove;
• the bore including a first cylindrical portion, which extends between the first annular groove and a third position spaced rearward from the first annular groove by a certain distance, a second cylindrical portion, which extends between the third position and a fourth position spaced rearward from the third position by a certain distance, and a conical portion, which extends between the fourth position and a nut rear end;
• the first cylindrical portion being smaller in diameter than the second cylindrical portion, and having a diameter adapted for slidable engagement with the shank front portion;
• the second cylindrical portion 13 having a diameter adapted for slidable engagement with the shank rear portion, the second cylindrical portion also having a second annular groove for engagement with the ring spring;
• the second annular groove being formed at a fifth position spaced rearward from the first annular groove by a certain distance, which distance is shorter than the distance between the bolt front end and the rear portion annular groove;
• and
• the conical portion widening rearwardly.