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 201–243 of 243 products

SKU	ID	OD	Thickness	Material	ID TOL	OD TOL	Quantity
440-59-062	ID 0.116	OD 0.625	Thickness 0.062	Material Phenolic	ID TOL +-.005	OD TOL +-.005	Quantity
440-60-016	ID 0.12	OD 0.228	Thickness 0.016	Material Phenolic	ID TOL +-.005	OD TOL +-.005	Quantity
440-61-016	ID 0.12	OD 0.25	Thickness 0.016	Material Phenolic	ID TOL +-.005	OD TOL +-.005	Quantity
440-62-062	ID 0.12	OD 0.281	Thickness 0.062	Material Phenolic	ID TOL +-.005	OD TOL +-.005	Quantity
440-63-016	ID 0.125	OD 0.25	Thickness 0.016	Material Phenolic	ID TOL +-.005	OD TOL +-.005	Quantity
440-64-031	ID 0.125	OD 0.281	Thickness 0.031	Material Phenolic	ID TOL +-.005	OD TOL +-.005	Quantity
440-65-016	ID 0.125	OD 0.312	Thickness 0.016	Material Phenolic	ID TOL +-.005	OD TOL +-.005	Quantity
440-65M-031	ID 0.125	OD 0.312	Thickness 0.031	Material Phenolic	ID TOL +-.005	OD TOL +-.005	Quantity
440-66-062	ID 0.125	OD 0.375	Thickness 0.062	Material Phenolic	ID TOL +-.005	OD TOL +-.005	Quantity
440-67-031	ID 0.125	OD 0.39	Thickness 0.031	Material Phenolic	ID TOL +-.005	OD TOL +-.005	Quantity
440-68-016	ID 0.129	OD 0.187	Thickness 0.016	Material Phenolic	ID TOL +-.005	OD TOL +-.005	Quantity
440-69-031	ID 0.129	OD 0.218	Thickness 0.031	Material Phenolic	ID TOL +-.005	OD TOL +-.005	Quantity
440-70-031	ID 0.129	OD 0.25	Thickness 0.031	Material Phenolic	ID TOL +-.005	OD TOL +-.005	Quantity
440-71-016	ID 0.129	OD 0.281	Thickness 0.016	Material Phenolic	ID TOL +-.005	OD TOL +-.005	Quantity
440-72-031	ID 0.129	OD 0.312	Thickness 0.031	Material Phenolic	ID TOL +-.005	OD TOL +-.005	Quantity
440-73-062	ID 0.129	OD 0.343	Thickness 0.062	Material Phenolic	ID TOL +-.005	OD TOL +-.005	Quantity
440-74-031	ID 0.129	OD 0.375	Thickness 0.031	Material Phenolic	ID TOL +-.005	OD TOL +-.005	Quantity
440-75-062	ID 0.129	OD 0.437	Thickness 0.062	Material Phenolic	ID TOL +-.005	OD TOL +-.005	Quantity
440-76-031	ID 0.129	OD 0.5	Thickness 0.031	Material Phenolic	ID TOL +-.005	OD TOL +-.005	Quantity
440-77-031	ID 0.129	OD 0.562	Thickness 0.031	Material Phenolic	ID TOL +-.005	OD TOL +-.005	Quantity
440-78-062	ID 0.129	OD 0.625	Thickness 0.062	Material Phenolic	ID TOL +-.005	OD TOL +-.005	Quantity
440-79-016	ID 0.141	OD 0.187	Thickness 0.016	Material Phenolic	ID TOL +-.005	OD TOL +-.005	Quantity
440-80-031	ID 0.141	OD 0.218	Thickness 0.031	Material Phenolic	ID TOL +-.005	OD TOL +-.005	Quantity
440-81-016	ID 0.141	OD 0.25	Thickness 0.016	Material Phenolic	ID TOL +-.005	OD TOL +-.005	Quantity
440-82-016	ID 0.141	OD 0.281	Thickness 0.016	Material Phenolic	ID TOL +-.005	OD TOL +-.005	Quantity
440-83-031	ID 0.141	OD 0.312	Thickness 0.031	Material Phenolic	ID TOL +-.005	OD TOL +-.005	Quantity
440-84-031	ID 0.141	OD 0.343	Thickness 0.031	Material Phenolic	ID TOL +-.005	OD TOL +-.005	Quantity
440-85-062	ID 0.141	OD 0.375	Thickness 0.062	Material Phenolic	ID TOL +-.005	OD TOL +-.005	Quantity
440-86-062	ID 0.141	OD 0.437	Thickness 0.062	Material Phenolic	ID TOL +-.005	OD TOL +-.005	Quantity
440-87-031	ID 0.141	OD 0.5	Thickness 0.031	Material Phenolic	ID TOL +-.005	OD TOL +-.005	Quantity
440-88-062	ID 0.141	OD 0.562	Thickness 0.062	Material Phenolic	ID TOL +-.005	OD TOL +-.005	Quantity
440-89-031	ID 0.141	OD 0.625	Thickness 0.031	Material Phenolic	ID TOL +-.005	OD TOL +-.005	Quantity
440-90-031	ID 0.15	OD 0.25	Thickness 0.031	Material Phenolic	ID TOL +-.005	OD TOL +-.005	Quantity
440-91-031	ID 0.15	OD 0.312	Thickness 0.031	Material Phenolic	ID TOL +-.005	OD TOL +-.005	Quantity
440-92-031	ID 0.15	OD 0.375	Thickness 0.031	Material Phenolic	ID TOL +-.005	OD TOL +-.005	Quantity
440-93-031	ID 0.15	OD 0.437	Thickness 0.031	Material Phenolic	ID TOL +-.005	OD TOL +-.005	Quantity
440-94-062	ID 0.15	OD 0.5	Thickness 0.062	Material Phenolic	ID TOL +-.005	OD TOL +-.005	Quantity
440-94M-031	ID 0.152	OD 0.5	Thickness 0.031	Material Phenolic	ID TOL +-.005	OD TOL +-.005	Quantity
440-95-062	ID 0.15	OD 0.625	Thickness 0.062	Material Phenolic	ID TOL +-.005	OD TOL +-.005	Quantity
440-96-016	ID 0.156	OD 0.312	Thickness 0.016	Material Phenolic	ID TOL +-.005	OD TOL +-.005	Quantity
440-97-031	ID 0.156	OD 0.375	Thickness 0.031	Material Phenolic	ID TOL +-.005	OD TOL +-.005	Quantity
440-98-031	ID 0.156	OD 0.437	Thickness 0.031	Material Phenolic	ID TOL +-.005	OD TOL +-.005	Quantity
440-99-031	ID 0.156	OD 0.5	Thickness 0.031	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.