These plastic washers are good electrical insulators.

Nylon washers are stronger than polycarbonate and UHMW washers. Exposure to moisture may cause them to expand. Lubricant-filled nylon washers have a slippery surface that resists wear in high-friction applications.

Polycarbonate washers are more rigid than most plastic washers for high impact resistance. They have good moisture resistance and withstand oil, greases, and detergents.

UHMW washers have excellent moisture and abrasion resistance and good resistance to chemicals.

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These washers surpass most other plastic washers when it comes to withstanding chemicals, oil, and grease. All are excellent electrical insulators.

PTFE washers withstand high temperatures and have a slippery surface that resists wear in high-friction applications.

PVC washers resist acids and alkalies.

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These washers are excellent electrical insulators.

Phenolic washers have low moisture absorption, so they won’t expand or become brittle over time. Color ranges from red-brown to yellow-brown.

Hard fiber washers are resistant to organic solvents and petroleum-based oils. They meet the dimensional standards of DIN 125, but not all meet the thickness requirement.

Polypropylene washers resist organic solvents and degreasing agents.

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Low moisture absorption and good heat resistance make these washers suitable for wet and harsh environments. All are good electrical insulators.

Fiberglass washers are stronger than Delrin® acetal plastic washers and have excellent resistance to salt water. Color ranges from light green to light tan.

Delrin® acetal plastic washers combine a slippery, wear-resistant surface with good strength and rigidity.

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Able to withstand temperatures as high as 450° or 500° F, these are among the most heat resistant plastic washers we carry. They have good resistance to moisture and chemicals.

PEEK washers have excellent tensile strength for high-stress applications.

Carbon-filled PEEK washers are stronger and more moisture resistant than PEEK washers.

Ultem PEI washers are flame retardant, UV stable, and can be used outdoors. They also offer excellent electrical-insulating properties.

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Clipped to fit where standard washers can't, these won't rotate when you position the flat edge against a flat surface.

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

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These washers have smaller outside diameters than standard spring lock washers to fit neatly under socket head cap screws. Also known as conical washers, these have a slightly cupped shape that gives them spring-like flexibility to grip tighter than split and tooth lock washers. They minimize loosening from wear, temperature changes, and vibration. Serrations on the top and bottom provide extra gripping power. Load-rated Belleville disc springs are also available.

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

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

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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. DIN 137A is the standard for curved spring lock washers; although this is no longer an active standard, it’s still commonly referenced.

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.

Stainless steel washers are more corrosion resistant than steel, and almost as strong. 18-8 stainless steel washers will hold up in wet and humid environments, but will corrode if exposed to salt water or chemicals. 316 stainless steel washers are the most corrosion resistant, and will not corrode from water, salt, or chemicals.

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