Tooth lock washers are crucial fasteners engineered to resist loosening caused by vibration and torque, providing enhanced security in mechanical assemblies. They are widely used across various applications, from automotive repairs to home improvement projects, ensuring connections remain stable over time. Products were evaluated based on material strength, corrosion resistance, assortment variety, ease of operation, and feature analysis.
Vifmy External Tooth Lock Washers Assortment Kit(500 Pack),M2.5 M3 M4 M5 M6 M8 M10 M12 Metric 304 Stainless Steel External Star Washer Sets
$9.99
This kit offers a comprehensive selection of 304 stainless steel external tooth washers, providing excellent corrosion resistance and a generous quantity for diverse applications.
View on Amazon![260pcs[9 Sizes] Black Starlock Internal Tooth Lock Washers Assortment Kit, M2/ M2.5/ M3/ M4/ M5/ M6/ M8/ M10/ M12](https://m.media-amazon.com/images/I/41tkGfsvgOL._SL160_.jpg)
260pcs[9 Sizes] Black Starlock Internal Tooth Lock Washers Assortment Kit, M2/ M2.5/ M3/ M4/ M5/ M6/ M8/ M10/ M12
$6.99
The binifiMux kit provides a practical assortment of internal tooth washers made from 65Mn steel, offering a cost-effective solution for general-purpose internal locking needs.
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570Pcs External Tooth Lock Washer Set,8 Size Metric Star Washers (M2.5-M12)
$8.99
With a large quantity of 304 stainless steel external tooth washers and explicit suitability for high-vibration environments, the MroMax kit stands out for demanding applications.
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- External Tooth Lock Washer: The metric external tooth star lock washers assortment kit contains 8 sizes 500 pcs, which are m2.5(100 pcs),m3(100 pcs),m4(100 pcs),m5(70 pcs),m6(50 pcs),m8(30 pcs),m10(30 pcs),m12(20 pcs) ,8 different sizes of external star...
- 304 Stainless Steel: 304 Stainless steel external washers are made of high-strength materials with good corrosion resistance and long service life. Compared to galvanised materials, the oxidation resistance, corrosion resistance and rust resistance are...
- Easy Operation: Internal tooth star washers are mainly used for nuts and bolts from rotating and loosening due to vibration and friction, and play a role in preventing loosening and fixing objects to ensure the stability of machines
- Convenient Storage: Each of the 8 different sizes of external tooth lock washer are individually stowed by type in an easy to carry clear case.Easy to store and use,so that the rivnut will not be lost or mixed up during use
- Wide Application: External tooth washer are highly compatible with screws, nuts and bolts of the same size and can be used to connect moving parts or to prevent loose connections, such as in furniture repair, outdoor construction, and electrical...
- 【EXTERNAL TOOTH LOCK WASHERS ASSORTMENT】 This metric external tooth star lock washers assortment kit includes 485 pieces of high-quality metric 304 Stainless Steel externa tooth lock washers, organized into 8 essential sizes: M2.5(100pcs), M3(100pcs...
- 【HIGH QUALITY MATERIAL】These external washers are made of high-quality 304 Stainless Steel, offering excellent corrosion resistance and durability. It offers superior oxidation and corrosion resistance compared to galvanized materials, resulting in a...
- 【EXTERNAL TOOTH LOCKING WASHER FUNCTION】This external tooth design actively locks fasteners by applying constant spring force between the head and substrate. This forces bolt threads firmly against the mating threads, dramatically increasing...
- 【CONVENIENT STORAGE CASE】All 8 sizes of locking washer are individually housed in a durable, clear case. This organization prevents loss and mixing, ensuring the right locking washer is always at hand.
- 【VERSATILE USE】 Highly compatible with standard screws, nuts, and bolts, these external tooth washers are widely used. Applications range from furniture repair and outdoor construction to electrical maintenance, as well as automotive, marine...
- Internal Tooth Lock Washer: The metric internal tooth star lock washers assortment kit contains 8 sizes 500 pcs, which are m2.5(100 pcs),m3(100 pcs),m4(100 pcs),m5(70 pcs),m6(50 pcs),m8(30 pcs),m10(30 pcs),m12(20 pcs) ,8 different sizes of internal star...
- 304 Stainless Steel: 304 Stainless steel internal tooth washers are made of high-strength materials with good corrosion resistance and long service life. Compared to galvanised materials, the oxidation resistance, corrosion resistance and rust resistance...
- Easy Operation: Internal tooth star washers are mainly used for nuts and bolts from rotating and loosening due to vibration and friction, and play a role in preventing loosening and fixing objects to ensure the stability of machines
- Convenient Storage: Each of the 8 different sizes of internal tooth lock washer are individually stowed by type in an easy to carry clear case.Easy to store and use,so that the rivnut will not be lost or mixed up during use
- Wide Application: Internal tooth washer are highly compatible with screws, nuts and bolts of the same size and can be used to connect moving parts or to prevent loose connections, such as in furniture repair, outdoor construction, and electrical...
- 【Dimension and Quantity】-- Our multi-tooth star locking washers assortment kit contains 8 types of washers：m2.5(130 pieces), m3 (130 pieces), m4 (110 pieces), m5 (70 pieces), m6 (50 pieces), m8 (30 pieces), m10 (30 pieces), m12 (20 pieces). The...
- 【Quality Material】-- These star locking washers are made of high-quality 304 stainless steel, which has excellent oxidation resistance, corrosion resistance, and rust prevention, high strength, and is not easily deformed, ensuring long-term use.
- 【Product Function】-- External tooth star shaped locking washers create tension by “locking” the bolt or screw into the workpiece’s threaded hole. Unlike flat washers, they have serrations on the washer body to prevent rotation and provide a more...
- 【Convenient Storage】--8 different sizes of external tooth locking washers are stored separately in a transparent box according to their size. The box comes with clear labels for quick access and storage.
- 【Widely Application】--These external tooth star shaped locking washers are highly compatible with screws, nuts, and bolts of the same size, and can be used to connect moving parts or prevent loose connections, such as in electrical appliances...
- Speed Locking Washers Size: Speed locking washers assortment kit contains 8 size types of washers, which are m2.5-8(100pcs),m3-9(100pcs),m4-12(70pcs),m5-14(60pcs),m6-16(60pcs),m8-18(50pcs),m10-20(30pcs),m12-25(30pcs),8 different sizes to meet different...
- Steel Star Locking Washer: The push nuts assortment are made of high quality carbon steel material, which has high strength and can withstand certain loads and impacts, and can ensure the stability and working life of the star locking washer
- Star Locking Washer Function: The starlock washers are one of the indispensable elements in most mechanical equipment, it has a variety of roles in fixing, supporting and damping. It uses spring pressure to regulate reinforced shaped objects and is used...
- Wide Application: internal tooth lock washer is widely used in various fields, especially in machinery manufacturing, automobile manufacturing, shipbuilding, aerospace, rail transport and so on
- Convenient Storage: Each of the 8 different sizes of push on locking washer are individually stowed by type in an easy to carry clear case. Easy to store and use, so that the star locking washer will not be lost or mixed up during use
- Package Contents: You will receive 50 pieces of star-shaped locking washers with inner teeth. These include 10 pieces of M2x6mm, 10 pieces of M2.5x8mm, 10 pieces of M3x10mm, 10 pieces of M4x12mm, and 10 pieces of M5x14mm. Different size combinations can...
- Preferred Material: The washer is made of high-quality 65mn metal steel material, which has excellent corrosion resistance and rust resistance, is durable, not easy to deform, and has a longer service life.Easy to install and use
- Widely Used: Push nuts are widely used in shock absorption and insulation in various fields such as machinery and equipment, electronic equipment, automobiles, sports equipment, industrial production, etc.
- Function: It provides excellent spring force between the fastener head and the substrate. The grip is very strong and can be used to fix cars, strollers, grills, chairs and other items.
- Premium Carbon Steel Construction: These internal tooth star lock washers are made from high-strength carbon steel with a durable black oxide finish for superior corrosion resistance and long-lasting performance in demanding applications
- 500-Piece Assortment for Versatility: This push nuts assortment includes 8 essential sizes (M2.5, M3, M4, M5, M6, M8, M10, M12) totaling 500 pieces, providing the right fastener for a wide range of repair, maintenance, and DIY projects
- Secure Vibration-Resistant Locking: The internal tooth design of these push on locking washers bites into surfaces, creating a strong grip that prevents nuts and bolts from loosening due to vibration, ensuring reliable and safe connections
- Wide Industrial & DIY Application: Ideal for automotive repairs, machinery assembly, electronics, furniture, and countless other uses in manufacturing, construction, and home workshops, offering professional-grade fastening solutions
- Organized Storage Case Included: All 500 internal tooth star lock washers come neatly sorted by size in a sturdy, compartmentalized case, keeping your workspace tidy and making it easy to find the exact size you need quickly
- Exquisite Material: External internal tooth starlock washers are made of high-quality stainless steel, which is strong, not easy to deform or break, resistant to corrosion and rust, and can maintain good performance in any environment and is durable.
- External Tooth Star Lock Washers: The star-shaped configuration of lock washers provides flexibility to apply a spring force between the fastener head and the substrate and hold the bolt threads firmly and forcefully against the nut or substrate threads...
- Easy to Store: All star washers are stored in a transparent and sturdy storage box with compartments. Retaining washers are stored separately, well organized, easy to carry and find. There is no confusion during transportation and it is convenient to use.
- Wide Range of Applications: Widely used in various screw fastening applications, suitable for electrical connections in electrical appliances, automobiles and ships, valves, machinery, doors and windows and other fields.
- Package Includes: 330 pcs in total, size includes 20 pcs m10, 30 pcs m8, 50 pcs m6, 20 pcs m12, 60 pcs m2.5, 50 pcs m3, 50 pcs m4, 50 pcs m5 , the quantity is sufficient, and the size is rich to meet the needs of different fields.
- MASSIVE 1400-PIECE SET: This assortment is designed to be the last washer kit you'll ever need. With an enormous quantity covering 6 essential sizes (#6, #8, #10, 1/4", 5/16", 3/8"), you'll always have the right lock washer or flat washer on hand...
- BUILT TO LAST: Each washer is crafted from high-grade carbon steel and features a uniform zinc plating. This robust combination provides superior strength and excellent corrosion resistance, ensuring your repairs and assemblies remain secure and rust-free...
- 3-TYPE LOCKING SYSTEM: Master any fastening challenge. The kit includes Internal Tooth Lock Washers for confined spaces, External Tooth Lock Washers for maximum bite on soft materials, and standard Flat Washers for optimal load distribution. This...
- PRO-ORGANIZED STORAGE CASE: Forget messy jars and disorganized bins. All 1400 pieces are meticulously sorted and secured in a heavy-duty, compartmentalized case with clear labels. Find what you need in seconds and keep your workshop, garage, or service...
- COMPREHENSIVE PROFESSIONAL KIT: Suitable for mechanics, HVAC technicians, factory maintenance crews, and serious DIYers. Whether you're working on cars, trucks, motorcycles, agricultural machinery, industrial equipment, or home appliances, this...
- VERSATILE APPLICATION RANGE: Designed for automotive repair, machinery maintenance, appliance fixing, furniture assembly, plumbing, electrical projects, and general DIY tasks. This assortment saves time and reduces downtime by providing a ready-to-use...
- External Tooth Lock Washers Material: Made of 304 stainless steel, with good corrosion resistance and long service life. Compared with galvanized materials, it has stronger oxidation resistance, corrosion resistance and rust resistance, and the service...
- Starlock washers 550pcs includes eight sizes:m2.5(120 pcs),m3(120 pcs),m4(110 pcs),m5(70 pcs),m6(50 pcs),m8(30 pcs),m10(30 pcs),m12(20 pcs).
- Widely used: the internal star washers is matched with the same type of screws, nuts and bolts, which can be used to connect moving parts or prevent loose connection, such as shock absorption and insulation in furniture maintenance, outdoor construction...
- 550pcs internal lock washers is packed in a transparent box, with clear model classification, easy carrying and convenient storage, and the box can be reused.
- 550pcs internal lock washers is packed in a transparent box, with clear model classification, easy carrying and convenient storage, and the box can be reused.
This article is part of our complete guide Safety & Security — browse all our comparisons and buying guides.
Last update on 2026-09-01 / Affiliate links / Images from Amazon Product Advertising API
How to Choose the Best Tooth Lock Washers
Material Composition and Durability
The choice of material for tooth lock washers significantly impacts their longevity and performance in specific environments. In practice, 304 stainless steel, as seen in the Vifmy and MroMax external tooth washer kits, offers superior corrosion resistance, making it ideal for outdoor, marine, or damp conditions. Users often report that stainless steel maintains its integrity longer in such challenging settings. Conversely, materials like 65Mn steel or carbon steel with a black oxide finish, found in binifiMux and some Vifmy internal tooth washer sets, provide high strength and a degree of corrosion protection suitable for indoor or less aggressive environments. While robust, carbon steel may require additional rust prevention in humid conditions.
Internal vs. External Tooth Design
The main difference in tooth design, internal versus external, dictates the washer's application and how it grips. External tooth lock washers, such as those from Vifmy (B0CP7YZ9JY) and MroMax, feature teeth that extend outward, digging into both the fastener head and the mating surface. This design typically offers a larger contact area and is often preferred for larger bolt heads or when maximum locking force is required to prevent rotation. Internal tooth lock washers, exemplified by binifiMux and Vifmy (B0CP8Z7JMC) internal kits, have teeth that point inward. These are generally chosen for smaller fastener heads or where a cleaner, less protruding finish is desired, as the teeth are concealed beneath the fastener head. Both designs function by creating tension and friction to resist loosening due to vibration.
Assortment Size and Metric Compatibility
Considering the variety and quantity of washers in an assortment kit is crucial for ensuring you have the right size for different projects. Kits like the 500-pack Vifmy assortments (both external and internal) and the 570-piece MroMax kit provide a wide range of metric sizes (e.g., M2.5 to M12), which is typically sufficient for most common tasks. These larger assortments reduce the need for multiple purchases and ensure compatibility with standard metric nuts and bolts. Smaller kits, such as the 260-piece binifiMux offering, might be suitable for specific projects or users with less frequent needs, but may require supplementing if a wider range of sizes or higher quantities of a particular size are regularly required. Always verify the included sizes match your typical fastener dimensions.
Pros & Cons
Vifmy External Tooth Lock Washers Assortment Kit(500 Pack),M2.5 M3 M4 M5 M6 M8 M10 M12 Metric 304 Stainless Steel External Star Washer Sets
Pros
- Constructed from 304 stainless steel for excellent corrosion resistance.
- Includes a generous 500-piece assortment covering 8 common metric sizes (M2.5-M12).
- External tooth design provides a strong grip against the fastener head and surface.
Cons
- May not be suitable for applications requiring an internal tooth design for aesthetics or clearance.
- Specific strength ratings are not explicitly detailed in the product description.
260pcs[9 Sizes] Black Starlock Internal Tooth Lock Washers Assortment Kit, M2/ M2.5/ M3/ M4/ M5/ M6/ M8/ M10/ M12
Pros
- Features a black oxide finish for a degree of corrosion protection and a sleek appearance.
- Made from 65Mn steel, known for its high strength and elasticity.
- Offers 9 metric sizes, providing good versatility for internal tooth applications.
Cons
- The 260-piece count is smaller compared to other kits, potentially limiting for large projects.
- 65Mn steel may not offer the same level of long-term corrosion resistance as 304 stainless steel in harsh environments.
570Pcs External Tooth Lock Washer Set,8 Size Metric Star Washers (M2.5-M12)
Pros
- Largest assortment in the top 5 with 570 pieces, ensuring ample supply for various tasks.
- Explicitly mentioned as frequently used in high-vibration environments, indicating robust performance.
- Made from 304 stainless steel for superior oxidation and corrosion resistance.
Cons
- Only offers external tooth washers, limiting its use for internal-tooth specific applications.
- The quantity of each specific size might vary, requiring users to check the breakdown for their needs.
Common Mistakes to Avoid
Overlooking Material Compatibility for Environment
A common pitfall is selecting a tooth lock washer based solely on size without considering the operational environment. For instance, using a 65Mn steel or carbon steel washer, like those in the binifiMux kit, in an outdoor or humid setting can lead to premature corrosion. In practice, fasteners in marine or consistently damp conditions demand the inherent corrosion resistance of 304 stainless steel, as offered by Vifmy (B0CP7YZ9JY) or MroMax products, to maintain their locking integrity.
Incorrect Tooth Type for the Application
Failing to differentiate between internal and external tooth designs can compromise the effectiveness of the lock washer. External tooth washers, such as those from MroMax, are typically chosen for their wider grip and are effective with larger bolt heads. Conversely, an internal tooth washer, like those in the Vifmy internal kit (B0CP8Z7JMC), is better suited for applications where the teeth need to be concealed or where the fastener head is smaller. Using the wrong type can result in insufficient locking force or an undesirable aesthetic.
Underestimating Assortment Needs
Many users underestimate the variety and quantity of washers required for ongoing projects. Opting for a smaller kit, such as the 260-piece binifiMux assortment, might seem economical initially. However, if multiple projects involve diverse metric sizes (M2.5 to M12) or require numerous pieces of a single size, a larger assortment like the 500-pack Vifmy kits often proves more practical and prevents repeated purchases or project delays due to missing components.