Best M4 Lock Washers in 2026
Daisy
Last Updated: Jul 17, 2026
Daisy
Last Updated: Jul 17, 2026
![Hilitchi 600-Pcs [7-Size] Internal Tooth Starlock Washers Assortment Kit, Quick Speed Locking Washers, Black Oxide Finish](https://m.media-amazon.com/images/I/51CWzq526oL._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 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 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 |
|---|---|---|---|---|
| Xia Men Hai Rui Peng | 9.74 | ✅ | ✅ | ✅ |
➤【Set Include】: 7 size of M3 M4 M5 M6 M8 M10 M12 total 260pcs in a transparent box, applicable to different sizes of fasteners
➤【 Material 】: High Quality 65Mn metal steel, anti-corrosion and durable
➤【Type】: High Quality Internal Tooth Starlock Washers Kit
➤【Wide Application】: Widely used in machinery equipment, industrial production of shock absorption and insulation,can meet your different needs in daily life
➤【Feature】: A Lock washer exerts a spring force between the fasteners head and the substrate to create more friction and resistance to rotation
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| HanTof | 9.88 | ✅ | ✅ | ✅ |
High Quality Internal Tooth Starlock Washers Kit
Set Includes 7 Most Used Sizes: M3 M4 M5 M6 M8 M10 M12,320pcs in box
Made of 65Mn metal steel, black oxide finish Anti-corrosion and durable
Wide Application: used in machinery equipment, industrial production of shock absorption and insulation, can meet your different needs in daily life
No groove required—press these rings onto the end of a shaft. Use them on unhardened shafts that are softer than the push ring. The ring bites into the metal to form an interference grip. have teeth that dig into the shaft material, so expect minor scratching. Use a push nut installation tool to install rings, or install them manually.
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Lena Home Tools | 9.88 | ✅ | ✅ | ✅ |
Internal tooth star locking 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: 260pcs 9sizes of M2, M2.5, M3x10, M4x12, M5x14 each size 40 pieces; M6x16, M8x18, M10x20, M12x25 each size 15 pieces, 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 |
|---|---|---|---|---|
| cSeao | 9.77 | ✅ | ✅ | ✅ |
↑Material: Carbon Steel Q235;
↑Color: Black; ↑QTY: 105pcs;
↑Black Oxide Finish
↑Product name: Push on lock nuts;
Here is the list of top-rated brands that were evaluated by PM.
| Brand | Count |
|---|---|
| Hilitchi | 2 |
| Cseao | 1 |
| Hantof | 1 |
| Oiiki | 1 |
| Spzcdza | 1 |
We've carried out a comprehensive analysis of 1,985 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 $12.64, 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 6 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 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/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)
