Railway axle end cap screw locking device

A locking device for a railway axle end cap screw having a polygonal head, comprising a plate having a circular aperture of sufficient size to accommodate the shank of the screw and a peripheral edge spaced radially from said aperture and shaped for anti-rotational relation with the inner surface of the adjacent portion of the end cap rim, and a pair of plate-like tabs substantially normal to the plane of said plate on said peripheral edge of said plate and intersecting said plate on normals to radii of said aperture, said tabs being wholly spaced radially from the center of said aperture a greater distance than the maximum radius of the cap screw head whereby to provide sufficient clearance for rotation of the cap screw into end cap securing position and being of substantially greater length than the thickness of the head of said cap screw and having their ends remote from said plate preformed to facilitate folding said tabs into the space between the polygonal head of the cap screw and the end cap rim whereby through engagement with the rim and the cap screw head at locations spaced circumferentially thereof, to prevent undesired rotation and loosening of the screw.