Aluminum Flat Washers - Lightweight Corrosion-Resistant Washers

Aluminum flat washers offer excellent corrosion resistance and a light weight, making them ideal for aerospace, marine, electronics, and weight-sensitive applications where stainless steel or steel washers are too heavy. Superior Washer & Gasket Corp manufactures aluminum flat washers in standard and custom sizes from quality aluminum alloys.

Our ISO 9001:2015 certified manufacturing facility supplies aluminum flat washers from stock inventory and produces custom aluminum washers to your OD, ID, and thickness specifications. All aluminum washers are made in the U.S.A. with material certifications available on request.

Lightweight aluminum for weight-critical applications
Excellent corrosion resistance
Standard and custom aluminum flat washer sizes
ISO 9001:2015 certified quality assurance
Made in the U.S.A.

Showing 301–350 of 620 products

SKU	ID	OD	Thickness	Material	ID TOL	OD TOL	Quantity
475-370-019	ID 0.379	OD 0.499	Thickness 0.019	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-371-016	ID 0.379	OD 0.936	Thickness 0.016	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-372-032	ID 0.384	OD 0.497	Thickness 0.032	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-373-063	ID 0.384	OD 0.616	Thickness 0.063	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-374-089	ID 0.386	OD 0.626	Thickness 0.089	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-375-032	ID 0.388	OD 0.879	Thickness 0.032	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-376-032	ID 0.389	OD 0.687	Thickness 0.032	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-377-016	ID 0.393	OD 0.623	Thickness 0.016	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-378-063	ID 0.393	OD 0.75	Thickness 0.063	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-379-032	ID 0.393	OD 0.783	Thickness 0.032	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-38-032	ID 0.096	OD 0.438	Thickness 0.032	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-380-062	ID 0.393	OD 1.005	Thickness 0.062	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-381-016	ID 0.394	OD 0.561	Thickness 0.016	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-382-049	ID 0.394	OD 0.61	Thickness 0.049	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-383-090	ID 0.394	OD 0.625	Thickness 0.09	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-384-090	ID 0.394	OD 0.749	Thickness 0.09	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-385-062	ID 0.394	OD 0.937	Thickness 0.062	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-386-062	ID 0.395	OD 0.999	Thickness 0.062	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-387-020	ID 0.403	OD 0.549	Thickness 0.02	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-388-063	ID 0.406	OD 0.625	Thickness 0.063	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-389-062	ID 0.408	OD 0.733	Thickness 0.062	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-39-020	ID 0.097	OD 0.19	Thickness 0.02	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-390-062	ID 0.41	OD 0.813	Thickness 0.062	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-391-065	ID 0.41	OD 0.997	Thickness 0.065	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-392-032	ID 0.416	OD 0.561	Thickness 0.032	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-393-016	ID 0.421	OD 0.625	Thickness 0.016	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-394-040	ID 0.437	OD 1.213	Thickness 0.04	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-395-015	ID 0.438	OD 0.74	Thickness 0.015	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-396-063	ID 0.439	OD 0.562	Thickness 0.063	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-397-041	ID 0.44	OD 0.534	Thickness 0.041	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-398-030	ID 0.44	OD 0.691	Thickness 0.03	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-399-081	ID 0.44	OD 1.501	Thickness 0.081	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-40-025	ID 0.097	OD 0.25	Thickness 0.025	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-400-039	ID 0.441	OD 0.588	Thickness 0.039	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-401-081	ID 0.441	OD 1.002	Thickness 0.081	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-402-061	ID 0.441	OD 1.032	Thickness 0.061	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-403-064	ID 0.441	OD 1.311	Thickness 0.064	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-404-038	ID 0.442	OD 0.621	Thickness 0.038	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-405-034	ID 0.446	OD 0.639	Thickness 0.034	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-406-063	ID 0.449	OD 0.686	Thickness 0.063	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-407-112	ID 0.453	OD 1.002	Thickness 0.112	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-408-062	ID 0.454	OD 0.875	Thickness 0.062	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-409-060	ID 0.456	OD 0.749	Thickness 0.06	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-41-033	ID 0.097	OD 0.562	Thickness 0.033	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-410-125	ID 0.456	OD 1.105	Thickness 0.125	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-411-080	ID 0.457	OD 0.626	Thickness 0.08	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-412-061	ID 0.457	OD 0.855	Thickness 0.061	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-413-123	ID 0.461	OD 1.101	Thickness 0.123	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-414-039	ID 0.464	OD 0.749	Thickness 0.039	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-415-062	ID 0.469	OD 0.889	Thickness 0.062	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity

Frequently Asked Questions

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

What are aluminum flat washers?
Aluminum flat washers are lightweight, corrosion-resistant washers manufactured from quality aluminum alloys. Their low density makes them the preferred choice for aerospace, marine, electronics, and other weight-sensitive applications where steel or stainless steel washers would add unnecessary mass. Superior Washer manufactures aluminum flat washers in standard and custom sizes from its ISO 9001:2015 certified facilities in the USA.

What makes aluminum flat washers a good choice for my application?
Aluminum offers an excellent strength to weight ratio, natural corrosion resistance without the need for plating or coating, and non-magnetic properties. These characteristics make aluminum washers ideal for applications where weight reduction, galvanic compatibility with aluminum fasteners, or non-magnetic requirements are priorities.

What alloys are your aluminum flat washers made from?
Superior Washer manufactures aluminum flat washers from quality aluminum alloys including 2024, 5052, 6061, and other alloys depending on application requirements. Contact us to specify the alloy required for your order.

Can you make custom aluminum flat washers?
Yes. We manufacture custom aluminum flat washers to your exact OD, ID, and thickness specifications. Our stock inventory covers 620 standard sizes, and we produce non-catalog configurations to order. Use our Quick Quote form or call us to discuss your requirements.

Are your aluminum flat washers made in the USA?
Yes. All aluminum flat washers are manufactured in the United States at our facilities in Hauppauge, NY and Rock Hill, SC under our ISO 9001:2015 certified Quality Management System. Material certifications are available upon request.

In addition to aluminum, Superior Washer manufactures flat washers in a wide range of materials and sizes. Browse our complete collection of flat washers to find the right fit for your application.