A safety device for a truck, tractor, or trailer wheel assembly is an integral member with mounting holes for receiving axle studs of the wheel assembly to fix the integral member to the axle. The integral member has a radially extending portion which, when the integral member is fixed to the axle, overlaps the wheel studs of the wheel assembly but is free of any connection to the wheel studs. The integral member has tapered holes radially outbound of its mounting holes. In another embodiment, the integral member of the safety device has a cylindrical, interiorly threaded, sleeve portion and a radial portion extending radially outwardly from the sleeve portion with the radial portion having tapered holes radially outbound of the sleeve portion.