Locking plate for preventing loosening of hexagon socket head bolt in countersink

The invention relates to a locking plate for preventing loosening of a hexagon socket head bolt in a countersink. The middle of the locking plate (1) is a plate body (2) which is of an arch structure.The two ends of the plate body (2) are symmetrically provided with a pair of lock lugs (3). The middle of the plate body (2) is provided with a round hole (4). The locking plate can be installed in the countersink of a workpiece, and on the premise of not damaging the workpiece, enough anti-loosening performance can be provided; the locking plate is simple in structure, easy to produce and manufacture and good in economical efficiency; the locking plate is suitable for multiple specifications of hexagon socket head bolts; and the locking plate is easy to mount and demount. 本发明涉及种用于沉孔中内六角头螺栓防松的锁片，锁片(1)的中部为拱形结构的片体(2)；在片体(2)的两端对称设有对锁耳(3)；在片体(2)中部设有圆孔(4)。本发明可装入工件沉孔内，在不损伤工件的前提下，提供足够的防松性能；结构简单，易于生产制造，经济性好；可适用于多种规格的内六角头螺栓；易于安装和拆卸。