Importance

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Abstract

An internally threaded nut is provided which is to be screwed onto a hub bolt of a vehicle, e.g. an automobile, having, on its outer surface, near the forward or leading end thereof, a plurality of key protrusions oriented in the direction of the axis of the nut, and having also, on its outer surface and rearward of the key protrusions, a modified cylindrical section. The modified cylindrical section is not a true circle and is provided with a first diameter interspersed with several flattened, or larger diameter portions, as viewed in cross-section. The key protrusions are preferably trapezoidal in cross-section, are generally parallel to each other, and each has a specific configuration wherein one or more of the key projections differ in width from the others so as to form a particular combination, which can only be turned by a key element or key socket having matching trapezoidal cavities. Different combinations of trapezoidal elements with differently modified cylindrical sections will require different key sockets. In this manner, a great number of combinations may be employed.

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First Claim