These tension lock nuts are hexagonal nuts used with bolts and washers of the same material, finish and grade. The top portion of the internal threads are deformed to create rotational resistance when displaced by a mating male threaded fastener, thus preventing loosening. The elliptical shape helps resist vibration and all-metal composition makes it perfect for high heat applications like automotive. The package size designates the inner diameter and the number of threads per inch or thread pitch.
