Teflon Flat Washers

Maintenance teams lose time to bolts that seize, corrode, or are hard to undo at pipe and flange joints. A PTFE flat washer placed under a bolt head or nut addresses this in three ways. It keeps the fastener from contacting the mating metal, which limits corrosion between the two. Its low-friction surface reduces galling, making the joint easier to disassemble at the next service. And PTFE resists most acids, bases, and solvents.

Key properties

• Resistant to most acids, bases, and solvents. Check a chemical compatibility chart for your specific chemical, concentration, and temperature before you specify a grade.
• Virgin PTFE is rated from -200 °C to +260 °C. Filled grades have their own limits, listed on the datasheet or available upon request.
• The non-stick surface lowers the torque needed to tighten and makes disassembly easier during planned shutdowns.
• Our materials meet relevant FDA regulations for food-contact PTFE. We list certificates on our About Us page.

Material grades

• Food, pharmaceutical, and high-purity lines where contamination matters.
• Bolted joints and flanges that need better creep resistance and torque retention.
• Pump housings, valves, and dynamic seals exposed to abrasive media. Better wear resistance and compressive strength.
• Heavy machinery and high-temperature flange connections. Higher thermal conductivity and load capacity. Confirm the pressure and temperature rating before using it in steam service.
• Sliding interfaces and wear-prone parts. Graphite conducts electricity, so do not use this grade where electrical insulation is required.

Electrical insulation

Virgin PTFE is non-conductive and has high dielectric strength, so it suits insulating fasteners. Filled grades behave differently. See the grade list above.

Ordering

Minimum order quantities and tolerances are available on request. Volume pricing is tiered for industrial buyers. Send your size, grade, and quantity, and we will quote. We can arrange freight and export paperwork. Please tell us your destination, and we will confirm lead time and cost.

Frequently asked questions

Can Teflon flat washers handle aggressive chemicals?

Most acids, bases, and solvents, yes. A few substances attack PTFE, including molten alkali metals and elemental fluorine. Check the compatibility chart for your chemical and temperature.

Are they suitable for high-temperature flange connections? 

Virgin PTFE is rated to +260 °C. At higher temperatures and loads, filled grades resist creep better. Bronze-filled grades are used in steam and heavy-machinery service, but confirm the rating for your pressure and temperature.

Will they insulate electrical fasteners?

Virgin PTFE is non-conductive with high dielectric strength. Graphite-filled grades conduct and are not suitable for insulation.

What if my joint carries heavy loads?

PTFE creeps under sustained load so that a PTFE washer won't stay fully rigid. Glass-filled and carbon-filled grades creep less than virgin PTFE. Please tell us the load and operating temperature, and we will recommend a grade.