Abstract: The present invention comprises a lug nut which has two separable portions connected by a frangible neck, wherein a first portion engages the threads of the stud, and a second portion provides a surface adapted to engage a wrench so that the lug nut may be driven into the stud. When the stud-engaging first portion has been threaded onto the stud and sufficiently tightened, continued application of torque cause the frangible, wrench-engaging second portion to shear off from the stud-engaging first portion. The stud engaging portion has an annular notch which is adapted to engage a snap ring located in the wrench-engaging portion. After the wrench-engaging portion is severed from the stud-engaging portion, the wrench-engaging portion is then reversed and positioned onto the stud-engaging portion. When so positioned, the snap ring engages the notch, which rotatably secures the wrench-engaging portion to the stud engaging portion.

Abstract: Heavy-duty cotter pin for retaining retainer member in position. The legs of the cotter pin each have an integrally formed locking arm extending angularly outwardly therefrom, locking the cotter pin in position without forcefully spreading or deforming the legs. The legs of the cotter pin are biased outwardly relative to each other and extend from a bight portion of the pin at equal angles with respect to the longitudinal center line of the pin. The legs are moved toward and laterally of each other to enter the hole of a pin or other retainer member and clear the locking arms from the hole. The locking arms are maintained in their angular outwardly extending position, both during placing of the cotter pin in a hole and removing the cotter pin from the hole.