Anti-theft lock insertion

[0019] As shown in Figure 1, the anti-theft lock cylinder includes an outer jacket 2, an inner core 1, a key and a spring not shown in the figure, wherein the outer jacket 2 covers the inner core 1, and the transmission head 100 of the inner core passes through the bottom of the outer jacket. Hole 201 stretches out and links to each other with the dead bolt of lockset, is provided with five radial post holes 103 on the inner core, is equipped with spring and bullet post 3 respectively in each post hole, and the arc-shaped head of bullet post 3 leans against Keyhole 101 (strictly speaking, the keyhole is surrounded by the keyhole groove on the inner core 1 and the inner wall of the overcoat 2), an annular groove 301 is provided on the cylindrical surface of the bullet post, and an annular groove 301 is arranged on the surface of the inner core along the axial direction. There is a groove 104 communicating with the column hole 103, the inner end of the groove 104 extends to the fron