Split lock washers, also known as spring lock washers, have a spring action that creates resistance against vibration. They have an opening where one side gradually rises above the other that compresses while simultaneously pushing against the mating surfaces. They are often used with softer materials and do not provide as much resistance to loosening in harder materials.

Curved split lock washers have a wavy shape for use with right- and left-hand bolted joints and are more vibration-resistant than split lock washers in treated lumber applications. These washers compress as the fastener is tightened to prevent movement-induced loosening in treated lumber applications.

These washers have teeth around their outer diameter to tightly grip into the work surface for greater hold than internal tooth washers. External tooth washers work well with larger bolt or screw heads.

These concave washers have flexed external teeth to absorb vibration and shock and prevent slipping. They are used in countersunk holes to accommodate flat or oval countersunk-style screws with head angles of 82 or 100 degrees.

Internal tooth lock washers absorb shock and minimize vibration to stop nuts or bolt heads from loosening. These washers are used in electrical applications where they scrape the surface of the surrounding area to improve the electrical connection.

These washers feature internal and external teeth to simultaneously grasp the nut or bolt head and contact surface for more robust holding power. They cover oversized holes and bearing surfaces and are used in electrical bonding applications.

These washers have indentations on their surface that bite both into the fastener head and the contact surface to create maximum holding power. The increase in friction force prevents the fastener from coming loose. Serrated lock washers work well on soft materials.

These two-piece washers create a wedge by locking into each other to prevent rotation in high-vibration and dynamic load environments. Wedge washers have a higher clamp load than serrated lock washers and their locking function is not affected by lubrication. Teeth on one half of the washer engage with wedges on the other when tightened, utilizing tension instead of friction to secure bolted joints.