Best M4 Lock Washers in 2026
Daisy
Last Updated: Jul 17, 2026
Daisy
Last Updated: Jul 17, 2026
![Hilitchi 300-Pcs [8-Size] 304 Stainless Steel External Tooth Star Lock Washers Assortment Set - Size Included: M2 M3 M4 M5 M6 M8 M10 M12](https://m.media-amazon.com/images/I/61j4eLxaMUL._AC_SL500_.jpg)
* PickSmartly editors independently research, review, and endorse the top products through comprehensive data analysis. We may earn a commission for qualifying purchases made through our product links.
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Amazon.com | 9.68 | ✅ | ✅ | ✅ |
GALVANIZED STAINLESS STEEL: These lock and flat washers provide excellent protection and security for nuts and bolts. They are made with galvanized stainless steel for long-term use and outstanding durability.
VERSATILE & COMPATIBLE: These assorted washers come in multiple sizes to fit all your screws, nuts, and bolts. Each washer features a solid bearing surface to prevent the nut or bolt head from tearing through the material.
OPTIMAL SURFACE AREA: Each stainless-steel flat or lock washer easily deflects the screw or bolt load, spreading the weight evenly for a secure and sure fit. These washers for screws and bolts are ideal for use at home or in the workshop.
THE RIGHT SIZE: This set of washers contains a wide variety of sizes. It includes lock washers in sizes #6, #8, #10, 1/4", 5/16", and 3/8" and flat washers in sizes #6, #8, #10, 1/4", 5/16", and 3/8".
CONVENIENT STORAGE: Keep your washers ready for your next home or automotive project. This 350-piece set comes in a convenient, sturdy plastic box with divided compartments for easy storage and an inside lid display for easy organization.
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Ylyl Direct | 9.68 | ✅ | ✅ | ✅ |
【800 Pcs Washers for Screws】800 Pcs stainless steel flat washers for screws bolts, 9 different sizes M2（210 Pcs) M2.5（200 Pcs） M3（100 Pcs） M4（100 Pcs） M5（70 Pcs）M6（40 Pcs ） M8（50 Pcs ） M10（20 Pcs ） M12（10 Pcs ），Total：800 pcs / 9 different sizes fender washers assortment set kit can meet your different needs.
【Top 304 Stainless Steel】Our assorted hardware Lock metal washers, is made of top 304 stainless steel which has the advantages of high hardness, well wear-resistance, corrosion resistance and rust resistance. Which can ensure long time using even in bad environment like high temperature, cold weather, and high humidity areas.
【Widely Application】Fender washers assortment set kit, perfect for interior decoration, outdoor construction, electrical maintenance and furniture repair, The flat washers could be used for fixing bolts with smaller diameter than the hole of washers.
【Easy Storage】All stainless steel flat washers for screws bolts are packed in a sturdy Transparent Plastic case, Clear and Easy to Use Storage Box Use 9 grids to distinguish 9 sizes, with specification label, for your use simple and clear every time.
【SATISFACTION GUARANTEED】Our team is committed to providing every customer with good assorted hardware lock metal washers and satisfactory service. If there are any problems with our fender washers assortment set kit, contact us and we would be very happy to solve your problems. Be sure to Add to Cart.
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Hilitchi | 9.88 | ✅ | ✅ | ✅ |
【✔】High Quality Stainless Steel External Tooth Star Lock Washers Assortment Set
【✔】Set Includes 8 Most Used Sizes: M2.5 M3 M4 M5 M6 M8 M10 M12 【Metric, please See Picture 2 for Specific Dimensional Size】
【✔】Made of 304 Stainless Steel Material, Very Good Corrosion Resistance, It Can Be Used in a Humid Environment
【✔】Package Quantity: 300-Piece, All of Washers Will Be Packed in A Sturdy Transparent Plastic Case, Can Be Use for A Storage Box
【✔】A Lock washer exerts a spring force between the fasteners head and the substrate, which maintains the washer hard against the substrate and the bolt thread hard against the nut or substrate thread, creating more friction and resistance to rotation.
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| HELIFOUNER | 9.89 | ✅ | ✅ | ✅ |
【Sizes】M2 M2.5 M3 M4 M5 M6 M8 M10 M12, total 900 pieces/9 sizes of the most commonly used black zinc washers, flat washers, metal washers in a plastic case, different size can satisfy your different needs.
【Design】Flat washers, metric washers, metal washers are designed for electrical connections on household and commercial appliances, automotive and marine uses in which the power source has a threaded/bolt-type connection.
【Material】Black zinc plated steel, which have good corrosion resistance in bad environment like high temperature, cold weather, and high humidity areas. They have superior rust resistance and excellent oxidation resistance, which can ensure long time using.
【Package Included】900 pieces 9 sizes in total, package in a durable transparent box with label. It is easy to distinguish the size of the product, you can choose the suitable one to meet all your needs.
【Wide Applications】Highly compatible with screws, nuts and bolts of same sizes and feature solid bearing surface to prevent nut/bolt head from tearing through material. Designed to spread the load of a screwed fastening and prevent loosening in industrial, shop, decks and fence building, automotive and home appliances.
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| JianFeng Store | 9.86 | ✅ | ✅ | ✅ |
Internal Tooth Star Lock Washers: High Quality Stainless Steel External Tooth Star Lock Washers Set of 320 pcs, includes the most commonly used 8 sizes: M2.5: 50 pcs / M3: 50 pcs / M4: 50 pcs / M5: 50 pcs / M6: 50 pcs / M8: 30 pcs / M10: 20 pcs / M12: 20 pcs.
Features: Internal Tooth Lock Washer Star exerts a spring force between the fasteners head and the substrate, which maintains the washer hard against the substrate and the bolt thread hard against the nut or substrate thread, creating more friction and resistance to rotation.
Material: Made of high-quality 304 stainless steel environmentally friendly materials, high strength (not easy to deform), wear-resistant, corrosion-resistant, rust-resistant and oxidation-resistant. All gaskets will be packaged in a sturdy clear plastic box that can be used in a storage box.
Applications: Widely used in a variety of screw fastening applications, ideal for electrical connections in household and commercial appliances, automobiles and ships.
100% SERVICE: We Promise the Premium Quality and the Best Service, If You are Not Completely Satisfied with Your Purchase Simply Let us Know.
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Hilitchi | 9.88 | ✅ | ✅ | ✅ |
【✔】High Quality Stainless Steel External Internal Tooth Star Lock Washers Assortment Set
【✔】Set Includes 8 Most Used Sizes: M2(2.5) M3 M4 M5 M6 M8 M10 M12 【Metric, please See Picture 2 for Specific Dimensional Size】
【✔】Made of 304 Stainless Steel Material, Very Good Corrosion Resistance, It Can Be Used in a Humid Environment
【✔】Package Quantity: 400-Piece, All of Washers Will Be Packed in A Sturdy Transparent Plastic Case, Can Be Use for A Storage Box
【✔】 A Lock washer exerts a spring force between the fasteners head and the substrate, which maintains the washer hard against the substrate and the bolt thread hard against the nut or substrate thread, creating more friction and resistance to rotation.
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Hilitchi | 9.88 | ✅ | ✅ | ✅ |
【✔】High Quality 304 Stainless Steel Internal Tooth Starlock Washers Kit
【✔】Made of 304 Stainless Steel Material, Very Good Corrosion Resistance, It Can Be Used in a Humid Environment
【✔】Set Includes 7 Most Used Sizes: M3 M4 M5 M6 M8 M10 M12【 Please See Picture 2 for Specific Dimensional Size】
【✔】Package Quantity: 180-Piece, All of Washers Will Be Packed in A Sturdy Transparent Plastic Case, Can Be Use for A Storage Box
【✔】A Lock washer exerts a spring force between the fasteners head and the substrate, which maintains the washer hard against the substrate and the bolt thread hard against the nut or substrate thread, creating more friction and resistance to rotation.
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| JianFeng Store | 9.86 | ✅ | ✅ | ✅ |
External Tooth Star Lock Washers: High Quality Stainless Steel External Tooth Star Lock Washers Set of 320 pcs, includes the most commonly used 8 sizes: M2.5: 50 pcs / M3: 50 pcs / M4: 50 pcs / M5: 50 pcs / M6: 50 pcs / M8: 30 pcs / M10: 20 pcs / M12: 20 pcs.
Features: Internal Tooth Lock Washer Star exerts a spring force between the fasteners head and the substrate, which maintains the washer hard against the substrate and the bolt thread hard against the nut or substrate thread, creating more friction and resistance to rotation.
Material: Made of high-quality 304 stainless steel environmentally friendly materials, high strength (not easy to deform), wear-resistant, corrosion-resistant, rust-resistant and oxidation-resistant. All gaskets will be packaged in a sturdy clear plastic box that can be used in a storage box.
Applications: Widely used in a variety of screw fastening applications, ideal for electrical connections in household and commercial appliances, automobiles and ships.
100% SERVICE: We Promise the Premium Quality and the Best Service, If You are Not Completely Satisfied with Your Purchase Simply Let us Know.
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Hilitchi | 9.88 | ✅ | ✅ | ✅ |
【✔】High Quality Internal Tooth Starlock Washers Kit
【✔】Made of 65Mn Metal Steel, Anti-corrosion and Durable
【✔】Set Includes 7 Most Used Sizes: M3 M4 M5 M6 M8 M10 M12【 Please See Picture 2 for Specific Dimensional Size】
【✔】Package Quantity: 600-Piece, All of Washers Will Be Packed in A Sturdy Transparent Plastic Case, Can Be Use for A Storage Box
【✔】A Lock washer exerts a spring force between the fasteners head and the substrate, which maintains the washer hard against the substrate and the bolt thread hard against the nut or substrate thread, creating more friction and resistance to rotation.
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Hilitchi | 9.88 | ✅ | ✅ | ✅ |
♛ High Quality Stainless Steel Flat Washers and Spring Lock Washers Kit
♛ Set Includes 8 Most Used Sizes: M2 M2.5 M3 M4 M5 M6 M8 M10
♛ Made of 304 Stainless Steel Material, Very Good Corrosion Resistance, It Can Be Used in a Humid Environment.
♛ Package Quantity: 640-Piece, Set Includes Flat Washers 320-Pcs, Lock Washers 320-Pcs
♛ All of Washers Will Be Packed in A Sturdy Transparent Plastic Case, Can Be Use for A Storage Box
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Hilitchi | 9.88 | ✅ | ✅ | ✅ |
♛ High Quality Stainless Steel External Tooth Star Lock Washers Set
♛ Set Includes 8 Most Used Sizes: M2.5 M3 M4 M5 M6 M8 M10 M12
♛ Made of 304 Stainless Steel Material, Very Good Corrosion Resistance, It Can Be Used in a Humid Environment.
♛ Package Quantity: 300-Piece, All of Washers Will Be Packed in A Sturdy Transparent Plastic Case, Can Be Use for A Storage Box
♛ Perfect for electrical connections on household and commercial appliances, automotive and marine uses in which the power source has a threaded/bolt-type connection
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| JianFeng Store | 9.86 | ✅ | ✅ | ✅ |
1. 304 Stainless Steel Spring Lock Washers Set，Good Corrosion Resistance, It Can Be Used in a Humid Environment.
2. 7 Most Used Sizes: M2.5 M3 M4 M5 M6 M8 M10, Flat & Lock
3. 260 Pieces，Packed in A Sturdy Transparent Plastic Case
4. As a Reliable, Responsible Professional Producer, We Will Not Cut Corners on the Quality of Products.
5. NOTE Cause of the Small Size, Please Keep it Properly, Avoid to Play by Children and Lead to Accidental Swallow or other Dangers!
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Hilitchi | 9.88 | ✅ | ✅ | ✅ |
【✔】High Quality Internal Tooth Starlock Washers Kit
【✔】Set Includes 7 Most Used Sizes: M3 M4 M5 M6 M8 M10 M12【 Please See Picture 2 for Specific Dimensional Size】
【✔】Made of 65Mn Metal Steel, Anti-corrosion and Durable
【✔】Package Quantity: 280-Piece, All of Washers Will Be Packed in A Sturdy Transparent Plastic Case, Can Be Use for A Storage Box
【✔】A Lock washer exerts a spring force between the fasteners head and the substrate, which maintains the washer hard against the substrate and the bolt thread hard against the nut or substrate thread, creating more friction and resistance to rotation.
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| PRIMEWARE-USA | 9.58 | ✅ | ✅ | ✅ |
Washer game set includes two 12.3" x 12.3" x 3.2"H felt-lined washer targets latched together, 8 washer (4 red, 4 blue). The exterior is made of painting finish to protect against scuffs and scratches.
For all ages and skill levels(Target distance may be changed based on skill levels of players.Targets lock together for easy transport with convenient carry handle.
Sturdy wood construction with plastic coated steel washers .Quick and easy to Set up!(Comes with game rules)
For outdoors use in winter, summer, spring and fall! Fun and Exciting Beach Game,Ideal for backyard, camping,tailgating and party.
Patent Pending
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Lena Home Tools | 9.89 | ✅ | ✅ | ✅ |
Internal tooth star lock washers exert a spring force between the fasteners head and the substrate, which maintains the washer hard against the substrate, these push nuts can be used as a kind of automobile fasteners.
Package included: 200pcs 5 sizes of M2, M2.5, M3, M4, M5 locking washers in a transparent plastic case-each size 40 pieces to meet different needs.
High quality: 65Mn metal steel material, anti-corrosion and durable
Function: Provide spring force, grip sturdy, create more friction and resistance to rotation.
Wide application: These push nuts can be widely used in machinery, furniture, electrical appliances, electronic equipment, cars, sports equipment and industrial production of shock absorption and insulation.
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| HELIFOUNER | 9.89 | ✅ | ✅ | ✅ |
【Sizes】M2 M2.5 M3 M4 M5 M6 M8 M10 M12, total 900 pieces/9 sizes of the most commonly used stainless steel spring lock washers, metal lock washers in a plastic case, different sizes can satisfy your different needs.
【Design】Lock washers, spring lock washers, metal lock washers are designed for electrical connections on household and commercial appliances, automotive and marine uses in which the power source has a threaded/bolt-type connection.
【Material】304 Stainless Steel, stainless steel material which have good corrosion resistance in bad environment like high temperature, cold weather, and high humidity areas. They have superior rust resistance and excellent oxidation resistance, which can ensure long time using.
【Weak Magnetic】The magnetic properties of 304 stainless steel due to the structure transformation reasons are not at the same level as the magnetic properties of stainless steel of other materials, which means that the magnetic properties of 304 steel always show weak magnetic properties.
【Wide Applications】Highly compatible with screws, nuts and bolts of same sizes and feature solid bearing surface to prevent nut/bolt head from tearing through material. Designed to spread the load of a screwed fastening and prevent loosening in industrial, shop, decks and fence building, automotive and home appliances.
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| BUSY-CORNER | 9.91 | ✅ | ✅ | ✅ |
【WIDE APPLICATION】Split lock zinc washers prefect use for around the house and yard decorations, electrical connections on household and commercial appliances, automotive and marine uses in which the power source has a threaded/bolt-type connection.
【DETAILED SIZE】Spring lock washers set includes 6 most used sizes, M3=250PCS, M4=250PCS, M5=150PCS, M6=100PCS, M8=25PCS, M10=25PCS.
【HIGH QUALITY】Split lock washer made from zinc.
【HANDY PACKING】800pcs washers in a clear plastic case, makes it easy to find correct size quickly, saves your time of running around looking for a particular size washer.
【CUSTOMER SERVICE】You are unsatisfied for any reason, return your goods with no questions asked and BUSY-CORNER STORE will provide a full refund.
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Jack&home | 9.89 | ✅ | ✅ | ✅ |
High Quality 7 Kinds Metric M3 M4 M5 M6 M8 M10 M12 Stainless Steel Starlock Push on Washers Assortment kit total 350Pieces
Starlock Washer;External Push Rings; Push On Washers;Speed Clips;Push Nuts for Unthreaded Shafts
Material:304 stainless steel;304 stainless steel have good chemical resistance and may be mildly magnetic
Widely used in machinery equipment, industrial production of shock absorption ,bearings, machinery etc
All contained in a compact and see through compartmented plastic Box.100% new,Perfect accessories of shock absorption for machinery equipment.Easy to install and durable to use
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| FSATNDE | 7.55 | ✅ | ✅ | ✅ |
Set Includes 8 most used sizes:M4 M5 M6 M8 N10 M12 M14 M16,can meet different using needs,good for your fixing or projects working.
Wedge locking washers are generally installed under the nut to prevent the nut from loosening.
Widely used in electrical connections on household and commercial appliances.
High quality 65Mn,good corrosion resistance.
All the small parts are packed in a transparent plastic box with compartments,which is convenient to carry,store or reuse as a backup kit.
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Amazon.com | 9.68 | ✅ | ✅ | ✅ |
wood washer toss set, 3 red plastic washers, 3 black plastic washers, solid wood side and end panels, base lining tricot - blue, 4" diameter white cup glued to base, rope handle on both boxes, lock latches on both boxes,
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Shenzhen Wujing Snail Technology Co. | 6.52 | ✅ | ✅ | ✅ |
Premium Material: The Starlock tooth washers are made of 65 manganese steel material with smooth edges, which is corrosion-resistant, high and low temperature resistant and durable for long-term use.
Easy to Use: The starlock locking washers exert a spring force between the mounting head and the substrate, which keeps the washer firmly fixed and creates more friction and rotation resistance.
Easy to store: All snap rings in the circlip assortment are packed in a sturdy transparent plastic case, which is easy to use, find and transport and can also be used as a storage box.
Wide Applications: The Starlock car body washers with internal teeth are ideal for machine equipment, industrial production of shock absorption and insulation, good for quick repairs and make repair very easy.
Package Includes: You will receive 340 pieces locking washers in sizes M3, M4, M5, M6, M8, M10, M12, suitable for different sizes of fasteners, enough for your daily use.
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| motorsbauer | 0.00 | ❌ | ❌ | ❌ |
100% brand new and high quality.
Made of 65# manganese steel, these lock washers are durable and sturdy.
This set contains many different sizes of washers to meet various need.
There are total 260 lock washer that you may use for a long time.
All washers are well packed and assorted in a plastic box for convenient storage.
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Taonucui-US | 5.18 | ❌ | ❌ | ❌ |
The kit includes 7 of the most common sizes: M3 M4 M5 M6 M8 M10 M12.
Made of high quality manganese steel material, durable and practical to use.
Wide range of applications, can be installed on many different types of materials.
High quality internal tooth lock washer kit, easy to install, great for professional use.
All gaskets are packed in a sturdy transparent plastic box for storage, easy to carry and easy to use.
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| TRENTON | 7.40 | ❌ | ❌ | ❌ |
Material: 65 Mn Steel
Features: Durable, Rust Resistance, Easy to Use, Locking Washer
These washers create a permanent installation and will lock on plastic, steel etc.
Made of 65 Mn steel, these washers are durable, strong, rust resistant and long lasting.
A locking washer exerts a spring force between the fasteners head and the substrate, which maintains the washer hard against the substrate.
Here is the list of top-rated brands that were evaluated by PM.
| Brand | Count |
|---|---|
| Hilitchi | 7 |
| Qteatak | 3 |
| Helifouner | 2 |
| Busy-Corner | 1 |
| Eastpoint Sports | 1 |
| Fasttend | 1 |
| Hvazi | 1 |
| Jst Gamez | 1 |
| Kuidamos | 1 |
| Mogen886 | 1 |
We've carried out a comprehensive analysis of 10,174 reviews on lock washers, using our selection criteria to identify the best options in the fasteners. Our findings reveal that most customers typically select lock washers priced around $15.17, with top brands including wensilon, hilitchi, helifouner, qteatak, busy-corner, persberg and pzrt and the hillman group
Our team of expert editors reviewed these high-quality items and handpicked the top 24 lock washers for your consideration. We've also done extensive research on numerous sellers, identifying the best ones in the fasteners category. These include wensilong, hilitchi, helifouner, jianfeng store, busy-corner and pzrt and amazon.com .
We are dedicated to assisting our users in finding the right washers Products based on their needs, saving them considerable time when choosing which lock washers to buy. We take pride in the number of satisfied users we've helped through our thorough and insightful reviews.
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![Hilitchi 300-Pcs [8-Size] 304 Stainless Steel External Tooth Star Lock Washers Assortment Set - Size Included: M2 M3 M4 M5 M6 M8 M10 M12 #TOP3](https://m.media-amazon.com/images/I/61j4eLxaMUL._SL500_.jpg)
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