Square washers fit into slots and channels and have flat sides to keep them from rotating. They are wider and thicker than most round washers, making them good for distributing heavy loads.

18-8 stainless steel washers have good chemical resistance and may be mildly magnetic.

Black-oxide steel washers are mildly corrosion resistant in dry environments.

Galvanized steel washers are 10 times as corrosion resistant as zinc-plated steel washers.

For technical drawings and 3-D models, click on a part number.

The arched shape of these washers presses up against a bolt and down against a nut to prevent loosening from wear, vibration, or temperature changes. Similar to a spring, they flatten out as pressure is applied, helping to absorb shocks. They grip bolts more tightly than split and tooth lock washers. Unlike split lock washers, which can only be tightened in one direction, these washers have a continuous body that can rotate in either direction.

Conical and curved washers are functionally the same, and are often referenced using their DIN specifications. These DIN specifications refer to slight differences in OD and thickness. DIN 6796 is the standard for conical spring lock washers, which are also known as Belleville washers.

Steel washers are stronger and more wear resistant than zinc-plated steel and stainless steel. They are best for dry environments, since moisture will cause them to rust. Zinc-plated washers have an outer layer of zinc that protects the inner steel from rust and extends the life of the washer. Similar to zinc plating, washers with a black phosphate coating are protected from rust in wet environments. They have a black finish that blends in with dark surfaces.

For technical drawings and 3-D models, click on a part number.

Also known as high-collar lock washers, these metric washers have smaller outside diameters than standard split lock washers to fit neatly under socket head cap screws. As the screw is tightened, these washers flatten to add tension to the joint. They counteract fatigue around the joint from small amounts of vibration, making them a common choice to prevent fasteners from loosening. However, they resist the least amount of vibration compared to other locking washers.

These washers are compatible with fasteners that have right-hand threads to prevent clockwise rotation. The uneven split ends bite into fasteners for a tight grip, but they won’t work with hardened surfaces. These washers hold better than curved or wave washers. They are not reusable after tightening.

316 stainless steel washers have excellent resistance to chemicals and salt water. They may be mildly magnetic.

18-8 stainless steel washers have good chemical resistance and may be mildly magnetic.

Zinc- and zinc yellow-chromate plated steel washers are corrosion resistant in wet environments.

For technical drawings and 3-D models, click on a part number.

Internal teeth dig into the screw head while the smooth outside edge won't snag objects. These washers provide greater vibration resistance than split lock washers. Use with fasteners that have small heads, such as fillister and cheese head screws.

Zinc-plated steel washers resist corrosion in wet environments.

18-8 stainless steel washers have good chemical resistance and may be mildly magnetic.

For technical drawings and 3-D models, click on a part number.

Teeth on the outside edge of these washers bite into the screw head and joint for a tight grip. Use with fasteners that have heads large enough to make contact with the teeth, such as pan, button, and binding head screws.

Zinc-plated steel washers are corrosion resistant in wet environments.

18-8 stainless steel washers have good chemical resistance and may be mildly magnetic.

For technical drawings and 3-D models, click on a part number.

The teeth on these washers bite further into the screw head and joint than standard external-tooth washers to provide a stronger hold. Use with fasteners that have heads large enough to make contact with the teeth, such as pan, button, and binding head screws.

18-8 stainless steel washers have good chemical resistance and may be mildly magnetic.

For technical drawings and 3-D models, click on a part number.

Bend the tab on these metric lock washers to prevent the fastener and washer from turning and loosening due to vibration. All meet DIN dimensional standards.

DIN 432 washers have a partial cone shape that gives them spring-like flexibility, so they distribute force and grip tighter than split and tooth lock washers. However, they do not resist vibration as well as DIN 93 washers. These washers prevent loosening from wear or changes in temperature when you bend the tab against the flats of a hex nut or bolt head. They do not need to be used near the edge of the mounting surface.

Steel washers resist wear better than 316 stainless steel but aren’t as corrosion resistant.

316 stainless steel washers are more corrosion resistant than steel, and nearly as strong. You can expose them to salt water, chlorine solutions, and chemicals without any rusting.

For technical drawings and 3-D models, click on a part number.

Also known as crush washers, these compress when tightened to form a tighter, more durable seal than rubber washers. They are commonly used to seal fluids such as oil and fuel. Washers are not reusable.

Copper washers are corrosion resistant in wet environments, nonmagnetic, and electrically conductive. Cellulose-filled copper washers are for low-torque applications since they’re easier to crush than standard copper washers.

Aluminum washers are lightweight and corrosion resistant in wet environments.

For technical drawings and 3-D models, click on a part number.