Lock washers known as split lock washers are engineered to provide a more uniform load distribution.
Ideal for situations where potential loosening from corrosion or vibration is a concern.
Lock washers provide a locking spring action and are used to prevent nuts and bolts from coming loose from vibrations. They have split ends that help lock into the mating material, thus providing a locking feature when tightened beneath a nut.
Bare finish fasteners have low corrosion resistance and are a good choice for indoor and industrial applications.
For the product numbers that are sold by weight, 5lbs or 40lbs the individual pieces that are contained within the package are approximate due to manufacturers making some flat washers/lock washers slightly thicker, or thinner.