Pictured here is the boxing style axle commonly found on older original vehicles produced here in the United States. Measurements and functionality is the same as the roller bearing axles, but the draw back is the routine maintenance required. Since both ends of the boxing are open and exposed, the grease tends to work its way out and needs to be regularly replenished. Because of the inner collar between the spindle and the square body of the axle, this style axle is not easily fitted to hydraulic brakes. The collar will not allow a backing plate to be installed which is necessary with drum style brakes.
Boxing Style Stubs can be viewed here.