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)
![Hilitchi 400-Pcs [8-Size] 304 Stainless Steel External Internal Tooth Star Lock Washers Assortment Kit - Included: M2 M3 M4 M5 M6 M8 M10 M12](https://m.media-amazon.com/images/I/619hIto9UyL._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 |
|---|---|---|---|---|
| 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 |
|---|---|---|---|---|
| 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 |
|---|---|---|---|---|
| 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 |
|---|---|---|---|---|
| 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.
Here is the list of top-rated brands that were evaluated by PM.
| Brand | Count |
|---|---|
| Hilitchi | 7 |
We've carried out a comprehensive analysis of 2,899 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 $14.01, 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 7 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 #TOP1](https://m.media-amazon.com/images/I/61j4eLxaMUL._SL500_.jpg)
![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 #TOP1](https://m.media-amazon.com/images/I/51yEmPUOJlL._SL500_.jpg)
![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 #TOP2](https://m.media-amazon.com/images/I/41tC+pyP3UL._SL500_.jpg)
![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/51XJoBtlS1L._SL500_.jpg)
![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 #TOP4](https://m.media-amazon.com/images/I/51CeXaB0uDL._SL500_.jpg)
![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 #TOP5](https://m.media-amazon.com/images/I/41TQgRgrmhL._SL500_.jpg)
![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 #TOP6](https://m.media-amazon.com/images/I/61yB05OGGCL._SL500_.jpg)
![Hilitchi 400-Pcs [8-Size] 304 Stainless Steel External Internal Tooth Star Lock Washers Assortment Kit - Included: M2 M3 M4 M5 M6 M8 M10 M12 #TOP2](https://m.media-amazon.com/images/I/619hIto9UyL._SL500_.jpg)
![Hilitchi 400-Pcs [8-Size] 304 Stainless Steel External Internal Tooth Star Lock Washers Assortment Kit - Included: M2 M3 M4 M5 M6 M8 M10 M12 #TOP1](https://m.media-amazon.com/images/I/61o-JYyhszL._SL500_.jpg)
![Hilitchi 400-Pcs [8-Size] 304 Stainless Steel External Internal Tooth Star Lock Washers Assortment Kit - Included: M2 M3 M4 M5 M6 M8 M10 M12 #TOP2](https://m.media-amazon.com/images/I/41AlEGhLHeL._SL500_.jpg)
![Hilitchi 400-Pcs [8-Size] 304 Stainless Steel External Internal Tooth Star Lock Washers Assortment Kit - Included: M2 M3 M4 M5 M6 M8 M10 M12 #TOP3](https://m.media-amazon.com/images/I/51PYwjuIknL._SL500_.jpg)
![Hilitchi 400-Pcs [8-Size] 304 Stainless Steel External Internal Tooth Star Lock Washers Assortment Kit - Included: M2 M3 M4 M5 M6 M8 M10 M12 #TOP4](https://m.media-amazon.com/images/I/610hzxW+6CL._SL500_.jpg)
![Hilitchi 400-Pcs [8-Size] 304 Stainless Steel External Internal Tooth Star Lock Washers Assortment Kit - Included: M2 M3 M4 M5 M6 M8 M10 M12 #TOP5](https://m.media-amazon.com/images/I/51fGqR0Ld4L._SL500_.jpg)
![Hilitchi 400-Pcs [8-Size] 304 Stainless Steel External Internal Tooth Star Lock Washers Assortment Kit - Included: M2 M3 M4 M5 M6 M8 M10 M12 #TOP6](https://m.media-amazon.com/images/I/51sRZwuPytL._SL500_.jpg)
![Hilitchi 600-Pcs [7-Size] Internal Tooth Starlock Washers Assortment Kit, Quick Speed Locking Washers, Black Oxide Finish #TOP4](https://m.media-amazon.com/images/I/51CWzq526oL._SL500_.jpg)
![Hilitchi 600-Pcs [7-Size] Internal Tooth Starlock Washers Assortment Kit, Quick Speed Locking Washers, Black Oxide Finish #TOP1](https://m.media-amazon.com/images/I/51qqGzS6IvL._SL500_.jpg)
![Hilitchi 600-Pcs [7-Size] Internal Tooth Starlock Washers Assortment Kit, Quick Speed Locking Washers, Black Oxide Finish #TOP2](https://m.media-amazon.com/images/I/413Zj2ygUeL._SL500_.jpg)
![Hilitchi 600-Pcs [7-Size] Internal Tooth Starlock Washers Assortment Kit, Quick Speed Locking Washers, Black Oxide Finish #TOP3](https://m.media-amazon.com/images/I/61aCLwpJtvL._SL500_.jpg)
![Hilitchi 600-Pcs [7-Size] Internal Tooth Starlock Washers Assortment Kit, Quick Speed Locking Washers, Black Oxide Finish #TOP4](https://m.media-amazon.com/images/I/41eLoQJ5bxL._SL500_.jpg)
![Hilitchi 600-Pcs [7-Size] Internal Tooth Starlock Washers Assortment Kit, Quick Speed Locking Washers, Black Oxide Finish #TOP5](https://m.media-amazon.com/images/I/51ZmywCi1AL._SL500_.jpg)
![Hilitchi 600-Pcs [7-Size] Internal Tooth Starlock Washers Assortment Kit, Quick Speed Locking Washers, Black Oxide Finish #TOP6](https://m.media-amazon.com/images/I/51Q-uIfTV8L._SL500_.jpg)
![Hilitchi 640-Pcs [8-Size] 304 Stainless Steel Flat Washer And Lock Washer Assortment Set - Size Included: M2 M2.5 M3 M4 M5 M6 M8 M10 #TOP5](https://m.media-amazon.com/images/I/61GviU0cktL._SL500_.jpg)
![Hilitchi 640-Pcs [8-Size] 304 Stainless Steel Flat Washer And Lock Washer Assortment Set - Size Included: M2 M2.5 M3 M4 M5 M6 M8 M10 #TOP1](https://m.media-amazon.com/images/I/515pfF-avlL._SL500_.jpg)
![Hilitchi 640-Pcs [8-Size] 304 Stainless Steel Flat Washer And Lock Washer Assortment Set - Size Included: M2 M2.5 M3 M4 M5 M6 M8 M10 #TOP2](https://m.media-amazon.com/images/I/51-bMlklIHL._SL500_.jpg)
![Hilitchi 640-Pcs [8-Size] 304 Stainless Steel Flat Washer And Lock Washer Assortment Set - Size Included: M2 M2.5 M3 M4 M5 M6 M8 M10 #TOP3](https://m.media-amazon.com/images/I/41OYmas8aAL._SL500_.jpg)
![Hilitchi 640-Pcs [8-Size] 304 Stainless Steel Flat Washer And Lock Washer Assortment Set - Size Included: M2 M2.5 M3 M4 M5 M6 M8 M10 #TOP4](https://m.media-amazon.com/images/I/51lpFsuQdOL._SL500_.jpg)
![Hilitchi 640-Pcs [8-Size] 304 Stainless Steel Flat Washer And Lock Washer Assortment Set - Size Included: M2 M2.5 M3 M4 M5 M6 M8 M10 #TOP5](https://m.media-amazon.com/images/I/61+GCedD4PL._SL500_.jpg)
![Hilitchi 640-Pcs [8-Size] 304 Stainless Steel Flat Washer And Lock Washer Assortment Set - Size Included: M2 M2.5 M3 M4 M5 M6 M8 M10 #TOP6](https://m.media-amazon.com/images/I/51N-RRlmBWL._SL500_.jpg)
