Best Flat Washers of 2025

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Flat washers are essential components in various mechanical and construction applications, providing a stable surface for fastening. These thin, disk-shaped pieces are typically made from materials like steel, plastic, or rubber, and are designed to distribute load and reduce the risk of damage to surfaces. By preventing loosening and wear, flat washers enhance the durability and reliability of assemblies. Their versatility makes them indispensable in everything from automotive repairs to household projects, ensuring secure connections in countless settings.
At a Glance: Our Top Picks
Top 10 Flat Washers
The Hillman Group 41585 SAE Flat Washer
The Hillman Group 41585 SAE Flat Washer, also known as Hillman Flat Washer, is a pack of 50 washers designed to increase the pressure provided by bolts or screws. With a zinc coating, these washers offer a corrosion-resistant finish, ensuring durability and longevity. These SAE fine washers are specifically designed for coarse threaded bolts, making them suitable for various applications. The Hillman Flat Washer is compatible with 3/8" bolts or screws and comes in a retail package with 50 washers. By using washers that match the finish of your other fasteners, you can maintain a cohesive and professional appearance. Whether you're working on a DIY project or handling professional tasks, these washers provide convenience and reliability.
VGBUY 275PCS Flat Washers Kit
The VGBUY Flat Washers assortment kit includes 275 pieces in six different sizes, perfect for various applications. With precise manufacturing, these washers are thickened for enhanced durability, ensuring they withstand pressure and wear. The polished surface of each washer guarantees a smooth finish, making installation easy and effective. Made from high-quality 304 stainless steel, they offer excellent resistance to corrosion and oxidation, allowing you to use them confidently in woodworking and mechanical tasks. This kit is a reliable choice for anyone in need of strong, long-lasting washers.
KURUI 1/4" Stainless Steel Washers
The KURUI Stainless Steel Washers are made from high-quality 18-8 (304) stainless steel, ensuring they resist rust and corrosion. This durability means you can rely on them for both indoor and outdoor projects without worrying about wear over time. The precise dimensions provide a perfect fit for your screws and bolts, making installation easier and more efficient. With 180 pieces in the set, you have plenty of washers for various applications, from construction to DIY tasks. Enjoy the peace of mind that comes with using dependable hardware for your projects.
wegoup 900 Pcs Stainless Steel Washers
The wegoup Flat Washer Set includes 900 high-quality stainless steel washers in nine different sizes, ensuring you have the right fit for various projects. Made from durable 304 stainless steel, these washers resist wear, corrosion, and rust, making them ideal for both indoor and outdoor use. Whether you're working on furniture repairs or electrical maintenance, the versatility of this assortment set is invaluable. Plus, the organized storage case makes it easy to find the right size quickly, saving you time and effort during your tasks.
YLYL 800 Pcs Stainless Steel Flat Washers
Introducing the YLYL Flat Washers, a versatile assortment set of 800 stainless steel flat washers in 9 different sizes. Made from top-grade 304 stainless steel, these washers are highly durable, resistant to wear, corrosion, and rust, making them perfect for various applications. Whether you need to fix bolts with smaller diameters, perform interior decoration, outdoor construction, electrical maintenance, or furniture repair, these washers have got you covered. The washers come neatly organized in a transparent plastic case with 9 separate compartments, making it easy to find the right size when you need it. With the YLYL Flat Washers, you can tackle any project with confidence and ensure long-lasting performance. Add them to your toolkit today!
1/4" Stainless Flat Washer, 5/8" Outside Diameter, 18-8(304) Stainless Steel Washers Flat (100 Pack) - KANSPHY
The KANSPHY Stainless Flat Washer is made of 304 Stainless Steel, providing increased corrosion resistance for both indoor and outdoor use. With an inside diameter of 0.26-0.277 Inch and an outside diameter of 5/8" Inch, these washers are perfect for 1/4 and M6 bolts. They are designed to distribute loads of threaded bolts, screws, and nuts, ensuring a smooth-bearing surface. The 0.06 Inch thickness adds stability and support to your fastening applications. With a package of 100Pcs, you will have an ample supply for your various projects. The KANSPHY Stainless Flat Washer is a reliable and versatile choice for any DIY enthusiast or professional.
KANSPHY 1/4" Stainless Steel Washers
The KANSPHY Stainless Washers are designed to meet your fastening needs with their precise dimensions of 1/4" inner diameter and 1" outer diameter. Made from 304 stainless steel, these washers provide excellent resistance to corrosion, making them suitable for both indoor and outdoor applications. They effectively distribute the load of bolts, screws, and nuts, ensuring a stable and smooth connection. With a thickness of 0.078", they create a reliable bearing surface that enhances the longevity and effectiveness of your projects. Each package comes with 40 washers, giving you ample supply for various tasks.
BCP Fasteners 5/16" Washers
The BCP Fasteners Washers come in a package of 100, making them a convenient choice for various projects. With an inner diameter of 5/16 inches and an outer diameter of 3/4 inches, these washers provide a reliable fit for many standard applications. Their thickness of 1/32 inches ensures that they sit flush and secure. Made from 304 stainless steel, they offer excellent resistance to corrosion, which is essential for outdoor or damp environments. This durability means you can trust these washers to maintain their integrity over time, giving you peace of mind in your work.
Wegoup 18-8 Stainless Steel Washer Kit
The Wegoup Washer Set is crafted from high-quality 304 stainless steel, ensuring exceptional resistance to rust and corrosion. This makes it ideal for both indoor and outdoor tasks, whether you’re working on automotive repairs or plumbing projects. The kit includes 100 pieces in 12 different sizes, providing you with versatile options for various applications. Each flat washer is designed for optimal load distribution, preventing damage to materials and enhancing stability. With reliable performance in high-stress situations, these washers are perfect for DIY enthusiasts and professionals alike, ensuring your projects are secure and efficient.
The Hillman Group Flat Washers 35010
The Hillman Flat Washers are essential for anyone looking to enhance the stability of their fasteners. By increasing the surface area under a fastener’s head, these washers effectively distribute the load, preventing any potential damage to the surface beneath. This is particularly useful when you want to avoid bolts or nuts pulling through material, ensuring a secure hold. Made from zinc-plated steel, these washers are durable and resistant to corrosion, making them suitable for various applications. With a pack of 100, you’ll have plenty on hand for your projects.
Frequently Asked Questions (FAQs)
1. What is the difference between a flat washer and a SAE washer?
The main difference between a flat washer and a SAE washer is their outer diameter and thickness. SAE flat washers, created by the Society of Automotive Engineers, have a smaller outer diameter and thinner gauges compared to USS (Unified Thread Standard) flat washers. SAE washers are designed to meet the specific requirements of the automotive industry.
2. What is flat vs spring washers?
Flat washers are flat, while spring washers are curved. Flat washers are commonly used in most applications, while spring washers are recommended for machines and objects that experience vibrations. Spring washers provide an axial load that counters vibrations and prevents fasteners from loosening.
3. Should I use a lock washer and a flat washer?
It is common to use a flat washer under a split locking washer to protect the base material or coating from damage caused by the split washer action. Additionally, a flat washer helps distribute the fastener load and prevents the split washer from falling or grinding into larger clearance hole features.
4. What is the difference between Type A and Type B flat washers?
Type A flat washers are steel washers with broad tolerances, suitable for applications where precision is not critical. On the other hand, Type B flat washers have tighter tolerances and are categorized as Narrow, Regular, or Wide based on their outside diameters. Type B washers are used in applications that require more precise dimensions.
5. Should a flat washer be used with a spring washer?
In cases of relatively large loads and vibration loads, it is recommended to use a combination of flat washers and spring washers. Spring washers are typically not used alone, but in combination with other washers to provide the needed locking and stability.
6. When should flat washers be used?
Flat washers are primarily used to increase the bearing surface area of a screw and reduce the surface pressure applied to the fastened object. They help prevent the sinking of the bearing surface under pressure, thus reducing the risk of loosening. Flat washers are particularly effective in reducing surface pressure.
7. When should you use spring washers?
Spring washers, also known as split lock or split ring washers, are used when there is a need to prevent fasteners from loosening due to vibration. They provide a locking effect and help keep the fasteners secure in applications where vibrations are present.
8. When should you not use a lock washer?
Lock washers, like wedge-locking washers, should not be used against soft surfaces such as wood or soft plastic. These soft materials may not be able to hold the serrations of the washer, leading to rotation of the bolt and a compromised bolted joint.
9. Where is the best place to put a lock washer?
A lock washer should be placed under the threaded fastener, either under a nut or the head of a screw or bolt. In assemblies with a nut and bolt, the lock washer should be positioned between the nut and the head of the bolt. This allows for proper tightening of the threaded fastener.
During our flat washer research, we found 24 flat washer products and shortlisted 10 quality products. We collected and analyzed 22,056 customer reviews through our big data system to write the flat washers list. We found that most customers choose flat washers with an average price of $7.53.
The flat washers are available for purchase. We have researched hundreds of brands and picked the top brands of flat washers, including The Hillman Group, VGBUY, KURUI, wegoup, YLYL. The seller of top 1 product has received honest feedback from 385 consumers with an average rating of 4.7.

Brian Howie is a content writer and senior industrial designer. After graduation from Westminster College, he has been engaged in product design and manufacturing for 18 years. Brian Howie has always found great pleasure in designing industrial products and sharing his ideas and experience online.
Flat Washers Comparison Table
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Brand | The Hillman Group | VGBUY | KURUI | wegoup | YLYL | KANSPHY | KANSPHY | BCP Fasteners | wegoup | The Hillman Group |
Material | Zinc | Stainless Steel | Stainless Steel | Stainless Steel | Stainless Steel | Stainless Steel | Stainless Steel | Stainless Steel | Stainless Steel | Steel |
Washer Type | Flat | Flat | Flat | Flat | Fender, Flat | Flat | Flat | Flat | Flat | Flat |
Exterior Finish | Ultra-Corrosion-Resistant | Stainless Steel | Stainless Steel | Stainless Steel | Stainless Steel | Stainless Steel | Stainless Steel | Stainless Steel | Stainless Steel | Zinc |
Outside Diameter | 0.75 Inches | 7/8 5/8 1-1/4 3/4 7/16 1/2 Inches | 0.63 Inches | 10 Millimeters | - | 0.63 Inches | 1 Inches | 0.75 Inches | 0.95 Inches | 0.5 Inches |
Fastener Size | 3/8" | - | 1/4" * 5/8" | M2 M2.5 M3 M4 M5 M6 M8 M10 M12 | M3 | M6 | M6 | 5/16" | M3 M4 M5 M6 M8 M10 M12 | 1/4" |
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