Nylon—The most popular plastic washers, these are strong, durable, and economical. Nylon will swell and weaken when exposed to moisture, so these washers are best for dry environments.

High-Strength Glass-Filled Nylon—Stronger than plain nylon, but not quite as strong as PEEK. These washers will swell and weaken when exposed to moisture, so they are best for dry environments.

Low-Friction Lubricant-Filled Nylon—Reduce friction between the washer, fastener, and mounting surface to prevent sticking when tightening and loosening.

Moisture-Resistant Delrin® Acetal—The best plastic for damp and wet environments, these washers won't swell or lose their strength if exposed to moisture.

Clear Impact-Resistant Polycarbonate—Withstand bumps and vibration without cracking or denting. These washers are also clear to be less noticeable in your assembly.

Low-Friction Impact-Resistant UHMW Polyethylene—The slippery surface reduces friction between the washer, fastener, and mounting surface to prevent sticking when fastening and loosening. These washers also resist bumps and vibration without cracking or denting.

Acid-Resistant PVC—A great choice for chemical-processing lines, these washers won't degrade when exposed to harsh acids, alkalis, and alcohols. They are also good electrical insulators.

Chemical-Resistant Polypropylene—These versatile washers resist a broad range of chemicals, such as petroleum, degreasers, and methyl ethyl ketone (MEK). They will weaken, however, if exposed to chlorine, lacquer solvents, or nitric acid.

Chemical-Resistant High-Temperature PTFE—The most chemical-resistant plastic washers we offer, these stand up to the widest range of harsh acids, bases, solvents, and corrosive cleaners, even at temperatures up to 500° F. Their slippery surface reduces friction between the washer, fastener, and mounting surface to prevent sticking when tightening and loosening. They are also good electrical insulators.

High-Strength High-Temperature PEEK—These washers bear heavier loads than most other plastic washers. In addition, they won't melt or deform when exposed to high temperatures up to 550° F. PEEK washers aren't very impact resistant, however, so they may crack or dent if subjected to hard bumps and vibrations.

Extreme-Strength High-Temperature Carbon-Filled PEEK—Second only to phenolic in terms of strength, these washers stand up to high-stress applications. They won't melt or deform when exposed to high temperatures up to 500° F.

Extreme-Temperature Polyimide—Our most temperature-resilient plastic washers. These won't deform or lose strength at temperatures as low as -450° F and as high as 750° F to handle everything from liquid nitrogen to heating elements. They are also good electrical insulators.

Electrically Insulating Ultem PEI—Our best electrical insulators, these washers are often used to secure components in circuit-breaker housings and semiconductors.

Extreme-Strength Electrically Insulating Phenolic— A close alternative to metal, these are the strongest of all our plastic washers and won't weaken, even when exposed to moisture. They protect components from unintentional electrical charges to prevent short circuits.

Chemical-Resistant High-Strength PVDF—Stronger than PTFE washers, but not quite as chemical resistant. These resist alcohols, fuel oils, and solvents, however they won't stand up to harsh bases, such as potassium hydroxide, as well as PTFE. Comparable to Kynar and Solef.