Best Spring Lock Washers of 2026

Brian Howie Avatar
Brian Howie
Last Updated: Jan 8, 2026

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Spring lock washers are essential components in various mechanical and industrial applications. Designed to provide a secure fastening solution, these washers feature a unique design with a split ring that creates tension and prevents loosening under vibration or torque. By distributing the load evenly, they enhance the reliability and longevity of connections, ensuring that bolts and nuts stay in place. With their easy installation and compatibility with different materials, spring lock washers are a reliable choice for professionals in construction, automotive, and other industries where secure fastening is crucial.

At a Glance: Our Top Picks

Instockbolts M8 Stainless Steel Split Lock Washer 100PCS Cover #TOP 1
Instockbolts M8 Stainless Steel Split Lock Washer 100PCS
ftb score rating icon 9.9
Aienxn 360PCS Stainless Steel Flat and Lock Washer Kit Cover #TOP 2
Aienxn 360PCS Stainless Steel Flat and Lock Washer Kit
ftb score rating icon 9.8
LuKaiSen 1147PCS 304 Stainless Steel Lock and Flat Washer Set Cover #TOP 3
LuKaiSen 1147PCS 304 Stainless Steel Lock and Flat Washer Set
ftb score rating icon 9.6

Top 10 Spring Lock Washers

#TOP 1

Instockbolts M8 Stainless Steel Split Lock Washer 100PCS

Silver
Instockbolts M8 Stainless Steel Split Lock Washer 100PCS Cover
M8 Split Lock Washer, 18-8 (304) Stainless Steel Spring Lock Washer 100PCS

The Instockbolts M8 Lock Washer is made from durable 18-8 (304) stainless steel, ensuring strong resistance to rust and corrosion. Its M8 size fits many common bolts and nuts, making it a versatile choice for various projects. This lock washer features a split design with offset ends that grip the material firmly, preventing loosening due to vibrations. You get a pack of 100 washers, giving you plenty of supply for multiple uses or future needs. Plus, customer service is available around the clock to help if you’re unsure about the size or have any questions after purchase.

What We Like
Durable stainless steel
M8 size for versatility
Effective locking design
Bulk pack of 100 pieces
24-hour customer support
#TOP 2

Aienxn 360PCS Stainless Steel Flat and Lock Washer Kit

Q-040+041-1
6# -1/2" (360PCS)
Aienxn 360PCS Stainless Steel Flat and Lock Washer Kit Cover
Aienxn 360PCS Flat Washer and Spring Lock Washers Assortment Kit, 304 Stainless Flat Washers for Screws, 7 SAE Sizes Washers for Bolts -1/2, 3/8, 5/16, 1/4, 10#, 8#, 6#, Lock Washer Set

The Aienxn Washer Set offers a collection of 360 flat and spring lock washers made from durable 304 stainless steel, ensuring long-lasting use. These washers resist rust and corrosion, so you can rely on them even in tough conditions like high heat or moisture. Because they maintain their shape well, you won’t have to worry about them bending or breaking during your projects. Plus, with seven common sizes included, this set is versatile enough to handle a variety of household, automotive, or commercial tasks where secure screw and bolt connections are needed.

What We Like
Durable 304 stainless steel
Rust and corrosion resistant
Maintains shape without deformation
Wide size variety
#TOP 3

LuKaiSen 1147PCS 304 Stainless Steel Lock and Flat Washer Set

LK-1147
LuKaiSen 1147PCS 304 Stainless Steel Lock and Flat Washer Set Cover
1147PCS Flat and Spring Lock Washers Assortment Kit, Metric Split Lock Washers for Screws Bolts, 304 Stainless Steel, 9 Sizes-M2 M2.5 M3 M4 M5 M6 M8 M10 M12 for Home, Factories, Kitchens, Shops

The LuKaiSen Lock Washer Kit offers 1147 pieces of high-quality 304 stainless steel washers in nine sizes, perfect for a variety of projects from furniture DIY to construction. You won’t need to worry about rust or corrosion, as these washers are built to last even in wet or harsh conditions. The washers fit perfectly with screws, nuts, and bolts of matching sizes, providing a strong grip that protects your materials and keeps your machines stable and safe. Plus, the kit comes neatly organized in a clear box with labeled compartments, making it easy for you to find and use the right size whenever you need it.

What We Like
304 stainless steel material
Wide size compatibility
Rust and corrosion resistant
Organized storage box
#TOP 4

Zxglxinyao 900 PCS Spring Lock Washers

Silver
Zxglxinyao 900 PCS Spring Lock Washers Cover
Zxglxinyao 900 PCS Stainless Steel Spring Lock Washer, Split Lock Washer, Split Ring Washer Bolt Screw Spring Washer, 2#, 1/8", 5/32", 3/16", 1/4", 5/16", 3/8", 1/2"

The Zxglxinyao Lock Washers are crafted from high-quality stainless steel, ensuring they resist corrosion and rust, making them ideal for tough environments. The split lock design enhances grip, preventing components from loosening due to vibrations, which is crucial for maintaining secure fastenings. Additionally, the spring lock washers utilize friction to keep bolted joints tight, providing peace of mind during use. With a wide range of sizes included, you’ll find the perfect fit for various applications, whether indoors or outdoors, making these washers versatile and reliable for your projects.

What We Like
Corrosion and rust resistance
Prevents loosening from vibrations
Versatile for various applications
Durable and long-lasting
#TOP 5

Instockbolts 1/4" Split Lock Washer

1/4"SLW
Silver
1/4"
Instockbolts 1/4" Split Lock Washer Cover
Instockbolt 1/4" Split Lock Washer, 18-8 (304) Stainless Steel Spring Lock Washer 150PCS

Introducing the Instockbolts Split Lock Washer, a high-quality stainless steel spring lock washer designed to provide a secure locking feature when tightened beneath a nut. With its 1/4" dimension, this washer offers a circular bearing surface with offset split ends, allowing it to bite into the mating material effectively. This ensures a tight and secure fit, preventing loosening and enhancing the overall stability of your assembly. With 100pcs included in the package, you can rest assured that you have enough for your project. Plus, the 24h private customer service is available to assist you with any after-sales problems. If you're unsure about the right size for your needs, feel free to reach out for personalized assistance. Upgrade your fastening game with the Instockbolts Split Lock Washer.

What We Like
High-quality stainless steel
Secure locking feature
Includes 100pcs
#TOP 6

binifiMux 1150pcs Spring Lock Washers Kit

CF-1200
silver
binifiMux 1150pcs Spring Lock Washers Kit Cover
binifiMux 1150pcs M2 M2.5 M3 M4 M5 M6 M8 M10 M12 Spring Lock Washers Assortment Kit, 304 Stainless Steel

The binifiMux Lock Washers Kit includes a comprehensive assortment of 1150 split lock washers in various sizes, ranging from M2 to M12. These washers are designed to enhance the fastening of screws and bolts by providing increased friction. Made from 304 stainless steel, they are resistant to rust and corrosion, ensuring durability over time. If you encounter any defective units, the customer support team is ready to assist you, making your purchase worry-free. This kit is perfect for DIY enthusiasts and professionals alike, ensuring you have the right size for every project.

What We Like
Durable stainless steel material
Variety of sizes included
Rust and corrosion resistant
Enhances fastening strength
#TOP 7

Aienxn 1000PCS 304 Stainless Steel Spring Lock Washers Assortment Kit, 9 Metric Sizes

Q-043+048-BOX
M2 -M12 (1000PCS)
Aienxn 1000PCS 304 Stainless Steel Spring Lock Washers Assortment Kit, 9 Metric Sizes Cover
Aienxn 1000PCS Spring Lock Washers Assortment Kit, 9 Metric Sizes -M2, M2.5, M3, M4, M5, M6, M8, M10, M12, 304 Stainless Steel Washers for Bolts Screws, Split Lock Washer Set

The Aienxn Spring Lock Washers kit offers you a set of high-quality washers made from durable 304 stainless steel, ensuring they resist rust and corrosion. This means you can rely on them even in tough environments like high heat or humid conditions. The washers are designed to keep their shape and strength, so they won’t easily bend or break, giving you long-lasting performance. With nine different sizes included, you get a versatile assortment that fits many bolts and screws, making your projects easier and more efficient.

What We Like
Durable stainless steel
Corrosion and rust resistant
Maintains shape under pressure
Wide size variety
Long-lasting performance
#TOP 8

Vifmy 304 Stainless Steel Spring Lock Washers Kit 910pcs

910 SS-304-SLW
Silver
Vifmy 304 Stainless Steel Spring Lock Washers Kit 910pcs Cover
Vifmy SAE Spring Lock Washers Assortment Kit(910 Pack), #4#6#8#10#12 1/4" 5/16" 3/8" 1/2" SAE Split Lock Washer Set, 304 Stainless Steel Lock Washers for Screws Bolts

The Vifmy Lock Washers Kit offers 910 pieces in nine different sizes, giving you a wide range of options for projects from furniture repair to building construction. Made from durable 304 stainless steel, these washers resist rust and corrosion, ensuring they last longer than regular galvanized washers. Their split design helps keep nuts, bolts, and screws tight by preventing loosening from vibrations, which is essential for stable and secure connections. Plus, the washers come neatly organized in a clear storage case, making it easy for you to find the right size quickly and keep everything tidy during your work.

What We Like
Wide size assortment
Durable stainless steel
Prevents loosening
Organized storage case
#TOP 9

OUSCHR M8 Black Spring Lock Washer 304 Stainless Steel 50 PCS

TDB-M8-50
Black
OUSCHR M8 Black Spring Lock Washer 304 Stainless Steel 50 PCS Cover
M8 Black Spring Lock Washer, 304 Stainless Steel, Black Coating Split Lock Washer Elastic Gasket, for Screws Fasteners, 50 PCS

The OUSCHR M8 Black Lock Washer is made from durable 304 stainless steel, which means it can handle high temperatures and resist wear over time. This material also helps with heat transfer and keeps electrical resistance low, making it reliable for various uses. Its black coating not only looks sleek but adds extra protection against rust and corrosion, so you don’t have to worry about it breaking down in harsh weather or humid conditions. Designed to fit with M8 nuts and bolts, this washer helps spread the pressure evenly when you tighten screws, preventing loosening and keeping your connections secure. This makes it a handy choice for electronics, machinery, and more.

What We Like
High temperature resistance
Corrosion and rust protection
Durable 304 stainless steel
Prevents bolt loosening
#TOP 10

Vifmy 304 Stainless Steel Spring Lock Washers Kit, 1780 Pcs, 18 Sizes

SS-304-1780 SLW
Silver
Metric and SAE
Vifmy 304 Stainless Steel Spring Lock Washers Kit, 1780 Pcs, 18 Sizes Cover
Vifmy Metric & SAE Spring Lock Washers Assortment Kit(1780Pcs), M2 M2.5 M3 M4 M5 M6 M8 M10 M12#4#6#8#10#12 1/4" 5/16" 3/8" 1/2" Metric SAE Split Lock Washer Set, 304 Stainless Steel Lock Washer

The Vifmy Spring Lock Washers Kit offers a versatile set of 1,780 pieces in 18 sizes, perfect for various projects from furniture repair to construction. Made from durable 304 stainless steel, these washers resist rust and corrosion, ensuring a longer lifespan compared to other materials. Their split design helps prevent nuts, bolts, and screws from loosening due to vibration, keeping your work stable and secure. Plus, the clear storage case keeps each size organized and easy to find, so you won’t waste time searching or mixing parts during your tasks.

What We Like
Wide size assortment
Durable stainless steel
Prevents loosening
Organized storage case
Buying Guide Image

Frequently Asked Questions (FAQs)

1. Are spring lock washers effective?

No, spring lock washers are not effective in preventing loosening. Numerous studies and practical experience have shown that they do not work and can even speed up the rate of loosening in some cases.

2. Where do you put a spring lock washer?

A spring lock washer should be placed on the nut side of the fastener. If an additional washer is needed to spread the load, it should be positioned between the spring washer and the mounting surface.

3. Why would you use a spring washer?

The primary purpose of using a spring washer is to provide tension and preload in a joint assembly. This helps maintain clamping force and prevents loosening or loss of tension caused by factors like vibration, thermal cycling, or other external forces.

4. When should you not use a lock washer?

A lock washer should not be used on soft surfaces like wood or soft plastic, as these materials cannot hold the serrations and may cause the bolt to rotate. It is best to avoid using lock washers in such cases to ensure a secure bolted joint.

5. Do spring washers go on the nut or bolt?

Spring washers, also known as locking washers, are placed on the nut side of the fastener. They are not used on the bolt side like flat washers.

6. What happens if a spring lock gets wet?

If a spring lock washer gets wet, moisture can make it damp and slippery, causing it to move out of place and potentially leading to a failure in its function.

7. What is a disadvantage of split lock washers?

One disadvantage of split lock washers is that their strength is often overrated, increasing the risk of loosening due to embedment. They are only able to withstand clamp forces introduced by fasteners up to a certain strength.

Editor's Notes

During our spring lock washer research, we found 24 spring lock washer products and shortlisted 10 quality products. We collected and analyzed 21,299 customer reviews through our big data system to write the spring lock washers list. We found that most customers choose spring lock washers with an average price of $7.15.

The spring lock washers are available for purchase. We have researched hundreds of brands and picked the top brands of spring lock washers, including Instockbolts, Aienxn, LuKaiSen, Zxglxinyao, binifiMux. The seller of top 1 product has received honest feedback from 237 consumers with an average rating of 4.9.

Written by
Brian Howie Avatar

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.