Back Home / Fasteners / Fasteners / KEP NUT UNC ZINC #4-40 KEP NUT UNC ZINC #4-40 SKU: XKN440 Categories: Fasteners, Fasteners Keps Nuts, also known as K lock nuts. A hex nut pre-assembled with a free spinning external tooth lock washer. The locking action is achieved when the nut is tightened against a bearing surface as the teeth of the lock washer dig into it. The most popular type of locknut because of its versatility, cost and ease of installation Case Quantity: 100 Log In For Pricing