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 1–50 of 620 products

SKU	ID	OD	Thickness	Material	ID TOL	OD TOL	Quantity
475-10-016	ID 0.0	OD 0.108	Thickness 0.016	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-100-072	ID 0.143	OD 0.35	Thickness 0.072	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-101-032	ID 0.143	OD 0.375	Thickness 0.032	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-102-031	ID 0.143	OD 0.435	Thickness 0.031	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-103-060	ID 0.144	OD 0.477	Thickness 0.06	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-104-032	ID 0.144	OD 0.498	Thickness 0.032	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-105-032	ID 0.145	OD 0.25	Thickness 0.032	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-106-039	ID 0.145	OD 0.437	Thickness 0.039	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-107-061	ID 0.145	OD 0.505	Thickness 0.061	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-108-032	ID 0.146	OD 0.229	Thickness 0.032	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-109-032	ID 0.146	OD 0.311	Thickness 0.032	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-11-016	ID 0.0	OD 0.153	Thickness 0.016	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-110-032	ID 0.147	OD 0.264	Thickness 0.032	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-111-040	ID 0.147	OD 0.373	Thickness 0.04	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-112-016	ID 0.148	OD 0.313	Thickness 0.016	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-113-082	ID 0.148	OD 0.374	Thickness 0.082	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-114-039	ID 0.15	OD 0.22	Thickness 0.039	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-115-031	ID 0.15	OD 0.278	Thickness 0.031	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-116-021	ID 0.15	OD 0.871	Thickness 0.021	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-117-030	ID 0.151	OD 0.23	Thickness 0.03	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-118-016	ID 0.151	OD 0.239	Thickness 0.016	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-119-072	ID 0.151	OD 0.32	Thickness 0.072	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-12-020	ID 0.0	OD 0.293	Thickness 0.02	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-120-063	ID 0.152	OD 0.282	Thickness 0.063	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-121-025	ID 0.152	OD 0.374	Thickness 0.025	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-122-051	ID 0.152	OD 0.623	Thickness 0.051	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-123-062	ID 0.153	OD 0.292	Thickness 0.062	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-124-020	ID 0.154	OD 0.345	Thickness 0.02	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-125-091	ID 0.154	OD 0.371	Thickness 0.091	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-126-071	ID 0.156	OD 0.499	Thickness 0.071	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-127-025	ID 0.157	OD 0.238	Thickness 0.025	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-128-032	ID 0.157	OD 0.312	Thickness 0.032	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-129-124	ID 0.157	OD 0.349	Thickness 0.124	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-13-015	ID 0.0	OD 0.373	Thickness 0.015	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-130-040	ID 0.159	OD 0.296	Thickness 0.04	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-131-031	ID 0.159	OD 0.374	Thickness 0.031	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-132-035	ID 0.16	OD 0.312	Thickness 0.035	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-133-063	ID 0.16	OD 0.352	Thickness 0.063	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-134-041	ID 0.16	OD 0.373	Thickness 0.041	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-135-063	ID 0.16	OD 0.438	Thickness 0.063	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-136-032	ID 0.16	OD 0.468	Thickness 0.032	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-137-031	ID 0.16	OD 0.495	Thickness 0.031	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-138-050	ID 0.16	OD 0.748	Thickness 0.05	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-139-015	ID 0.164	OD 0.247	Thickness 0.015	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-14-016	ID 0.0	OD 0.499	Thickness 0.016	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-140-016	ID 0.164	OD 0.376	Thickness 0.016	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-141-016	ID 0.165	OD 0.377	Thickness 0.016	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-142-052	ID 0.169	OD 0.313	Thickness 0.052	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-143-023	ID 0.169	OD 0.343	Thickness 0.023	Material Aluminum	ID TOL +-.005	OD TOL +-.005	Quantity
475-144-032	ID 0.169	OD 0.621	Thickness 0.032	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.