PEEK Flat Washers – Chemical and Temperature Resistant Solid Spacers for M2 to M4 Screws

When installing an HPLC fitting or precision connector, you may sometimes find that the connection still feels slightly loose after tightening, or that there is a small gap between the fastener and the mating surface. A properly sized flat washer can help take up this minor clearance, improve the contact between components and provide a more stable fastening interface. For applications exposed to elevated temperatures, PEEK flat washers are a practical option because PEEK maintains good dimensional stability and can help reduce deformation during long-term use.

PEEK also provides a useful combination of wear resistance and electrical insulation. As a non-metallic engineering material, it can help isolate screws from mating components while reducing direct metal-to-metal contact. This makes PEEK flat washers suitable for HPLC equipment, electronic equipment, precision instruments, mechanical assemblies and other applications where temperature resistance, wear resistance and electrical insulation are important. Their non-metallic construction can also be useful when the washer needs to avoid introducing a metal component into a precision assembly.

For compact fastening systems, PEEK flat washers are commonly selected for screw sizes such as M2, M2.5, M3 and M4. The correct washer should be selected according to the actual assembly, including the screw size, inner diameter, outer diameter and thickness. A suitable inner diameter provides clearance around the screw, while the outer diameter and thickness determine the contact area and available installation space. Standard sizes can be supplied for common fastening applications, while custom dimensions can be produced according to technical drawings, samples or specific OEM requirements.

If you need PEEK flat washers for HPLC fittings, precision equipment or other high-temperature, wear-resistant or electrically insulated applications, contact us with your required screw size and washer dimensions. You can provide the inner diameter, outer diameter, thickness, technical drawing or sample, and our engineering team can review the requirements and help determine a suitable PEEK washer configuration for your application.