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 451–500 of 620 products

SKU	ID	OD	Thickness	Material	ID TOL	OD TOL	Quantity
475-505-031	ID 1.127	OD 1.751	Thickness 0.031	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-506-072	ID 1.128	OD 1.5	Thickness 0.072	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-507-034	ID 1.254	OD 1.495	Thickness 0.034	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-508-090	ID 1.5	OD 2.622	Thickness 0.09	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-509-125	ID 1.688	OD 2.127	Thickness 0.125	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-51-039	ID 0.113	OD 0.309	Thickness 0.039	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-510-031	ID 1.755	OD 2.03	Thickness 0.031	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-511-063	ID 0.196	OD 1.0	Thickness 0.063	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-512-062	ID 0.379	OD 0.876	Thickness 0.062	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-513-062	ID 0.265	OD 0.499	Thickness 0.062	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-514-062	ID 0.267	OD 0.501	Thickness 0.062	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-515-050	ID 0.402	OD 0.531	Thickness 0.05	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-516-060	ID 0.204	OD 0.748	Thickness 0.06	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-517-031	ID 0.205	OD 0.5	Thickness 0.05	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-518-050	ID 0.162	OD 0.627	Thickness 0.04	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-519-040	ID 0.25	OD 1.0	Thickness 0.025	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-52-008	ID 0.114	OD 0.561	Thickness 0.008	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-520-020	ID 0.543	OD 0.8	Thickness 0.031	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-521-031	ID 0.325	OD 0.505	Thickness 0.04	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-522-032	ID 0.565	OD 1.468	Thickness 0.031	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-523-090	ID 0.565	OD 0.749	Thickness 0.01	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-524-040	ID 0.402	OD 0.531	Thickness 0.05	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-525-025	ID 0.206	OD 0.44	Thickness 0.031	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-526-040	ID 0.271	OD 0.626	Thickness 0.05	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-527-020	ID 0.643	OD 0.878	Thickness 0.032	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-528-050	ID 0.266	OD 0.689	Thickness 0.04	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-529-031	ID 0.52	OD 0.7	Thickness 0.031	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-53-032	ID 0.119	OD 0.562	Thickness 0.032	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-530-040	ID 0.506	OD 0.674	Thickness 0.04	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-531-048	ID 0.729	OD 0.938	Thickness 0.048	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-532-025	ID 0.404	OD 0.552	Thickness 0.0258	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-533-031	ID 0.184	OD 0.874	Thickness 0.031	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-534-020	ID 0.284	OD 0.47	Thickness 0.02	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-535-062	ID 0.194	OD 0.75	Thickness 0.062	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-537-032	ID 0.201	OD 0.444	Thickness 0.032	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-538-063	ID 0.203	OD 0.43	Thickness 0.063	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-539-049	ID 0.192	OD 0.563	Thickness 0.049	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-54-061	ID 0.121	OD 0.225	Thickness 0.061	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-540-063	ID 0.284	OD 0.626	Thickness 0.063	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-541-063	ID 0.627	OD 1.562	Thickness 0.063	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-542-061	ID 0.507	OD 0.624	Thickness 0.061	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-543-078	ID 0.418	OD 0.866	Thickness 0.078	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-544-020	ID 0.191	OD 0.375	Thickness 0.02	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-545-040	ID 0.158	OD 0.688	Thickness 0.04	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-546-031	ID 0.755	OD 1.188	Thickness 0.031	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-547-079	ID 0.657	OD 1.312	Thickness 0.079	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-548-025	ID 0.098	OD 0.214	Thickness 0.025	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-549-062	ID 0.133	OD 0.495	Thickness 0.062	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-55-032	ID 0.122	OD 0.374	Thickness 0.032	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-550-020	ID 0.322	OD 0.499	Thickness 0.02	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.