Abstract: A vibration-tolerant torque limiting fastening lug whereupon tightening of the set-screw produces a parasitic torque at the thread plane defining the set-screw/housing interface. The resultant parasitic torque acts in opposite direction to the installation torque such that the actual torque below the thread plane is less than the installation torque. As a result, the tensile force experienced by the set-screw and which acts against the housing of the lug is reduced.

Abstract: An improved electrical outlet box having thin wall construction and localized elements for structurally reinforcing the box. The thin wall outlet box includes a bottom wall and a perimeter wall perimetrically bounding the bottom wall and an open upper end defined by a lip. The perimeter wall comprises a plurality of sidewalls which join together to form corners. Each of the sidewalls has a reinforcement rib longitudinally extending substantially parallel to the lip and projecting inwardly toward the interior of the box. In addition, each of the corners has an outwardly projecting rib which extends downwardly from a point on the corner between the lip and the bottom wall onto the bottom wall.