The best internal tooth lock washer depends on the shaft or fastener size, material needs, and how many washers you want on hand. For a broad metric assortment, consider the 500-piece Vifmy or Vifmy stainless-steel kit; for more size variety and a larger count, the 660-piece kit covers nine listed metric sizes. The 260-piece binifiMux kit offers a smaller black-steel assortment, while Biaungdo is suited to buyers who need only five smaller sizes.
| Product | Best For | Listed Sizes | Material or Finish |
|---|---|---|---|
| binifiMux 260-Piece Kit | Black-steel assortment | M2–M12, nine sizes | 65Mn steel, black |
| Vifmy 500-Piece Kit | Quantity across eight sizes | M2.5–M12 | Carbon steel |
| Vifmy 500-Piece Stainless Kit | Corrosion resistance | M2.5–M12 | 304 stainless steel |
| Biaungdo 50-Piece Kit | Small-size needs | M2–M5 | 65Mn steel |
| 660-Piece Kit | Broad size coverage and quantity | M2–M12, nine listed sizes | 65Mn steel, black oxide |
binifiMux 260-Piece Black Starlock Washer Kit
Best for: Home repair users who want several common metric sizes in a compact assortment. The kit lists M2, M2.5, M3, M4, M5, M6, M8, M10, and M12 washers, with 260 pieces total in a storage box.
The washers are described as 65Mn steel with a black finish. This selection was chosen for its range of nine sizes and clearly stated material. It can suit buyers maintaining assorted small equipment or keeping replacement washers available for general projects.
Limitation: The product information does not provide a piece count for each size, so check the assortment details if you need a particular quantity of one size.
Vifmy 500-Piece Carbon Steel Assortment
Best for: Buyers who want a larger supply distributed across eight metric sizes. The listed sizes run from M2.5 to M12, and the product details give counts for each size, including 100 pieces each of M2.5 and M3.
The washers are made of carbon steel. The product description identifies spring pressure as part of the locking design and lists uses in fixing, supporting, and damping applications. Choose this kit if its size range and stated per-size counts match your repair needs.
Limitation: The supplied details do not specify a protective finish or corrosion-resistance rating. Consider the stainless-steel option if material corrosion resistance is a priority.
Vifmy 500-Piece 304 Stainless Steel Kit
Best for: Buyers who prioritize stainless-steel material and want a metric assortment. This 500-piece kit lists eight sizes from M2.5 through M12, with quantities specified by size.
The product identifies its material as 304 stainless steel and describes it as resistant to oxidation, corrosion, and rust. Its internal teeth are intended to help resist loosening from vibration and friction. It was selected for shoppers comparing material choice as well as size coverage.
Limitation: It does not list M2, and the quantity of larger sizes is lower than the quantity of the smallest sizes. Verify the size breakdown before choosing it for a project that uses larger washers extensively.
Biaungdo 50-Piece Small-Size Washer Set
Best for: Small repairs that use M2, M2.5, M3, M4, or M5 washers. The 50-piece set contains 10 of each listed size, making its quantity breakdown straightforward.
Biaungdo describes the washers as 65Mn metal steel and lists applications involving machinery, electronics, automobiles, and sports equipment. This set is a practical match when a buyer needs a limited quantity of smaller sizes rather than a broad M2–M12 assortment.
Limitation: It does not include M6 or larger sizes, so it is not the right choice for projects requiring a wider metric range.
660-Piece Black Oxide Starlock Assortment
Best for: Buyers who want a high overall piece count and coverage from M2 to M12. The listing names nine sizes: M2, M2.5, M3, M4, M5, M6, M8, M10, and M12.
The product is described as steel with a black oxide finish. Its listing says the washers provide spring tension and a firm grip, with vibration and shock absorption among the intended benefits. The broad stated size range makes it worth comparing for recurring repair or maintenance work.
Limitation: The listing does not provide quantities for each size, and its product name says 10 sizes while the feature list names nine. Confirm the included assortment before ordering if an exact size count is important.
Buying Guide: How to Choose an Internal Tooth Lock Washer
Which size should you buy?
Start by identifying the size required by the shaft or fastener in your application. Compare the exact metric sizes in the assortment rather than relying on the total number of pieces. If you need M2, for example, the listed Vifmy assortments that begin at M2.5 will not cover that size. Also check whether the seller provides a per-size quantity breakdown.
Should you choose carbon steel or stainless steel?
Material matters when the washer will be exposed to conditions where corrosion is a concern. One listed kit specifies 304 stainless steel and describes corrosion and rust resistance. Other options list carbon steel or 65Mn steel, with some identifying a black finish or black oxide coating. Compare the stated material and finish to the environment; do not assume all black finishes offer the same protection.
How many washers do you need?
A smaller set can make sense for occasional repairs or a narrow size range. Larger assortments may be more convenient for repeated maintenance, but the total count alone does not tell you how many washers of each size are included. Choose based on the sizes you use most often and confirm the distribution where it is provided.
What should you verify before ordering?
- Confirm the washer size required for the specific assembly.
- Check the listed sizes and per-size quantities against your needs.
- Review the stated material and finish for your use environment.
- Look for clear product details if the listing has conflicting size information.
Frequently Asked Questions
What does an internal tooth lock washer do?
It uses inward-facing teeth to create a locking grip in an assembly. The supplied product descriptions associate these washers with resisting loosening from vibration and friction.
Are internal tooth washers the same as ordinary flat washers?
No. The products in this guide are star-shaped locking washers with internal teeth, while the term “flat washer” does not specify that tooth design.
What does M size mean in these kits?
The listings use metric size labels such as M3, M6, and M12. Match the required size to the product details for your application rather than choosing by appearance alone.
Which assortment is best for corrosion resistance?
The Vifmy 500-piece kit listing specifies 304 stainless steel and describes corrosion and rust resistance. Confirm that its available sizes meet your requirements.
Should I buy the largest assortment?
Not necessarily. A larger kit is useful when you need more total pieces or more size coverage, but a smaller set may be a better fit for a narrow size range. Check the quantities for the sizes you expect to use.