Home | Phenolic Flat Washers - Hard, Heat-Resistant Insulating Washers

Phenolic Flat Washers - Hard, Heat-Resistant Insulating Washers

Phenolic flat washers are made from thermoset phenolic resin, offering excellent electrical insulation, hardness, and heat resistance-making them a reliable non-metallic washer for electrical equipment, circuit boards, and industrial applications with moderate temperature exposure. Superior Washer & Gasket Corp produces phenolic washers in standard and custom sizes.

As an ISO 9001:2015 certified specialty washer manufacturer, we supply phenolic washers alongside fiberglass, Kapton, mica, and other high-performance insulating washers-all made in the U.S.A. to your precise OD, ID, and thickness requirements.

  • Thermoset phenolic for hardness and electrical insulation
  • Good heat resistance for industrial applications
  • Standard and custom phenolic washer configurations
  • ISO 9001:2015 certified manufacturing
  • Made in the U.S.A.

Showing 101–150 of 243 products

SKU ID OD Thickness Material ID TOL OD TOL Quantity

440-188-047

ID 0.391
OD 0.609
Thickness 0.047
Material Phenolic
ID TOL +-.005
OD TOL +-.005
Quantity

440-189-062

ID 0.406
OD 0.812
Thickness 0.062
Material Phenolic
ID TOL +-.005
OD TOL +-.005
Quantity

440-19-016

ID 0.078
OD 0.21
Thickness 0.016
Material Phenolic
ID TOL +-.005
OD TOL +-.005
Quantity

440-190-031

ID 0.415
OD 0.75
Thickness 0.031
Material Phenolic
ID TOL +-.005
OD TOL +-.005
Quantity

440-191-016

ID 0.437
OD 0.625
Thickness 0.016
Material Phenolic
ID TOL +-.005
OD TOL +-.005
Quantity

440-192-031

ID 0.443
OD 0.625
Thickness 0.031
Material Phenolic
ID TOL +-.005
OD TOL +-.005
Quantity

440-192M-031

ID 0.202
OD 0.632
Thickness 0.031
Material Phenolic
ID TOL +-.005
OD TOL +-.005
Quantity

440-193-031

ID 0.443
OD 0.687
Thickness 0.031
Material Phenolic
ID TOL +-.005
OD TOL +-.005
Quantity

440-194-062

ID 0.443
OD 0.75
Thickness 0.062
Material Phenolic
ID TOL +-.005
OD TOL +-.005
Quantity

440-195-062

ID 0.443
OD 0.812
Thickness 0.062
Material Phenolic
ID TOL +-.005
OD TOL +-.005
Quantity

440-196-031

ID 0.443
OD 0.875
Thickness 0.031
Material Phenolic
ID TOL +-.005
OD TOL +-.005
Quantity

440-197-031

ID 0.45
OD 0.75
Thickness 0.031
Material Phenolic
ID TOL +-.005
OD TOL +-.005
Quantity

440-198-062

ID 0.458
OD 0.75
Thickness 0.062
Material Phenolic
ID TOL +-.005
OD TOL +-.005
Quantity

440-199-031

ID 0.473
OD 0.75
Thickness 0.031
Material Phenolic
ID TOL +-.005
OD TOL +-.005
Quantity

440-20-031

ID 0.089
OD 0.187
Thickness 0.031
Material Phenolic
ID TOL +-.005
OD TOL +-.005
Quantity

440-200-062

ID 0.473
OD 0.875
Thickness 0.062
Material Phenolic
ID TOL +-.005
OD TOL +-.005
Quantity

440-201-031

ID 0.473
OD 0.937
Thickness 0.031
Material Phenolic
ID TOL +-.005
OD TOL +-.005
Quantity

440-202-016

ID 0.5
OD 0.75
Thickness 0.016
Material Phenolic
ID TOL +-.005
OD TOL +-.005
Quantity

440-203-062

ID 0.5
OD 1.5
Thickness 0.062
Material Phenolic
ID TOL +-.005
OD TOL +-.005
Quantity

440-204-062

ID 0.505
OD 0.812
Thickness 0.062
Material Phenolic
ID TOL +-.005
OD TOL +-.005
Quantity

440-205-031

ID 0.51
OD 0.687
Thickness 0.031
Material Phenolic
ID TOL +-.005
OD TOL +-.005
Quantity

440-206-062

ID 0.515
OD 0.75
Thickness 0.062
Material Phenolic
ID TOL +-.005
OD TOL +-.005
Quantity

440-207-031

ID 0.515
OD 0.875
Thickness 0.031
Material Phenolic
ID TOL +-.005
OD TOL +-.005
Quantity

440-208-062

ID 0.515
OD 1.0
Thickness 0.062
Material Phenolic
ID TOL +-.005
OD TOL +-.005
Quantity

440-209-031

ID 0.515
OD 1.062
Thickness 0.031
Material Phenolic
ID TOL +-.005
OD TOL +-.005
Quantity

440-21-031

ID 0.089
OD 0.218
Thickness 0.031
Material Phenolic
ID TOL +-.005
OD TOL +-.005
Quantity

440-210-062

ID 0.531
OD 1.375
Thickness 0.062
Material Phenolic
ID TOL +-.005
OD TOL +-.005
Quantity

440-211-031

ID 0.569
OD 0.75
Thickness 0.031
Material Phenolic
ID TOL +-.005
OD TOL +-.005
Quantity

440-212-031

ID 0.569
OD 0.875
Thickness 0.031
Material Phenolic
ID TOL +-.005
OD TOL +-.005
Quantity

440-213-062

ID 0.569
OD 1.0
Thickness 0.062
Material Phenolic
ID TOL +-.005
OD TOL +-.005
Quantity

440-214-031

ID 0.569
OD 1.125
Thickness 0.031
Material Phenolic
ID TOL +-.005
OD TOL +-.005
Quantity

440-215-062

ID 0.569
OD 1.25
Thickness 0.062
Material Phenolic
ID TOL +-.005
OD TOL +-.005
Quantity

440-216-031

ID 0.578
OD 1.063
Thickness 0.031
Material Phenolic
ID TOL +-.005
OD TOL +-.005
Quantity

440-217-062

ID 0.64
OD 0.875
Thickness 0.062
Material Phenolic
ID TOL +-.005
OD TOL +-.005
Quantity

440-218-031

ID 0.64
OD 1.125
Thickness 0.031
Material Phenolic
ID TOL +-.005
OD TOL +-.005
Quantity

440-219-031

ID 0.64
OD 1.187
Thickness 0.031
Material Phenolic
ID TOL +-.005
OD TOL +-.005
Quantity

440-22-031

ID 0.089
OD 0.25
Thickness 0.031
Material Phenolic
ID TOL +-.005
OD TOL +-.005
Quantity

440-220-062

ID 0.64
OD 1.25
Thickness 0.062
Material Phenolic
ID TOL +-.005
OD TOL +-.005
Quantity

440-221-031

ID 0.68
OD 0.937
Thickness 0.031
Material Phenolic
ID TOL +-.005
OD TOL +-.005
Quantity

440-222-040

ID 0.69
OD 0.937
Thickness 0.04
Material Phenolic
ID TOL +-.005
OD TOL +-.005
Quantity

440-223-031

ID 0.765
OD 1.312
Thickness 0.031
Material Phenolic
ID TOL +-.005
OD TOL +-.005
Quantity

440-224-031

ID 0.781
OD 1.25
Thickness 0.031
Material Phenolic
ID TOL +-.005
OD TOL +-.005
Quantity

440-225-062

ID 0.781
OD 1.687
Thickness 0.062
Material Phenolic
ID TOL +-.005
OD TOL +-.005
Quantity

440-226-093

ID 0.81
OD 1.46
Thickness 0.093
Material Phenolic
ID TOL +-.005
OD TOL +-.005
Quantity

440-227-062

ID 0.875
OD 1.5
Thickness 0.062
Material Phenolic
ID TOL +-.005
OD TOL +-.005
Quantity

440-228-031

ID 0.89
OD 1.5
Thickness 0.031
Material Phenolic
ID TOL +-.005
OD TOL +-.005
Quantity

440-229-062

ID 0.937
OD 1.187
Thickness 0.062
Material Phenolic
ID TOL +-.005
OD TOL +-.005
Quantity

440-23-016

ID 0.089
OD 0.281
Thickness 0.016
Material Phenolic
ID TOL +-.005
OD TOL +-.005
Quantity

440-230-031

ID 0.96
OD 1.198
Thickness 0.031
Material Phenolic
ID TOL +-.005
OD TOL +-.005
Quantity

440-231-062

ID 1.005
OD 1.25
Thickness 0.062
Material Phenolic
ID TOL +-.005
OD TOL +-.005
Quantity

Phenolic Flat Washer Frequently Asked Questions

Below are answers to some of the most common questions about phenolic flat washers.

What are phenolic flat washers?
Phenolic flat washers are manufactured from phenol-formaldehyde resin laminate (Bakelite or equivalent), one of the oldest and most established electrical insulating materials. Phenolic is available in paper-base (XX, XXX, XXXP), cotton-base (C, CE, LE), and glass-base (G10) grades, each offering different balances of electrical, mechanical, and thermal properties.

What are phenolic washers used for?
Phenolic washers are used as electrical insulators in switchgear, relay panels, transformers, motors, and terminal blocks. They are also used as mechanical spacers in assemblies where a rigid, non-conductive washer is required. Phenolic is harder and more rigid than most thermoplastic washer materials, which makes it suitable for high-compression applications.

What phenolic grades do you stock?
Superior Washer manufactures phenolic flat washers in XX, XXX, and CE grades depending on the required electrical and mechanical properties. Contact us to specify the grade needed for your application.

Can you make custom phenolic flat washers?
Yes. We manufacture custom phenolic washers to your OD, ID, and thickness specifications. Contact us via the Quick Quote form or by phone.

Are your phenolic flat washers made in the USA?
Yes. All phenolic flat washers are manufactured in the United States under our ISO 9001:2015 certified Quality Management System. Material certifications are available upon request.

Phenolic is one of several rigid insulating materials we manufacture. View our complete flat washers lineup to compare all the options available.