Best M4 Lock Washers in 2026

【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.

【✔】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】

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.

♛ 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.

【✔】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

♛ 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.

【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.

√【Kindroufly Combination】: M2 (200 pieces), M2.5 (200 pieces), M3 (100 pieces), M4 (100 pieces), M5 (72 pieces), M6 (50 pieces), M8 (50 pieces), M10 (20 pieces), M12 (8 pieces), total 9 sizes 800pieces, different sizes and enough quantities can meet your different daily needs.

√【High Quality Stainless】: Kindroufly fender washers are made of 304 stainless steel, which have smooth surface, high strength, not easy to deform, corrosion resistance and rust resistance, can ensure a long time using in bad environment like high temperature, cold weather, and high humidity areas.

√【Fender Washers Function】: Flat washers are commonly used to prevent nuts from loosening. Our flat washers are well made, with smooth and shiny surface, highly compatible with screws, nuts and bolts of same sizes and feature solid bearing surface to prevent nut/bolt head from tearing through material.

【✔】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

1. Product Type: High precision starlock push on locking washers

2. Product Material: High quality 65Mn steel, hard and durable

3. Package Include: 7 size of M3 M4 M5 M6 M8 M10 M12 total 280pcs in a transparent box, applicable to different sizes of fasteners

➤【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

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

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

→Product: Starlock Washer Assortment Kit;

→Material: 304 Stainless Steel; →Main Color: Silver;

→Package: 220pcs x Starlock Washers

☞ Material: 65Mn Steel

☞ Package: 235pcs x Starlock Washer in one storage box

☞ Main Color: Black;

➤SOCELL stainless washers include :M2 M2.5 M3 M4 M5 M6 M8 M10 M12 flat washers.These sizes are often needed.

➤SOCELL stainless steel washers for screws contain 700pieces flat washers and a storage box for quick and easy use.

➤Widely Application: Perfect for electrical connections on household and commercial appliances, automotive and marine uses in which the power source has a threaded/bolt-type connection

MATERIAL: Assorted washers are manufactured with 304 stainless steel, washer set has the benefits of corrosion resistance, and good wear resistance, and a high level of hardness, which can ensure durability, even in worst weather conditions like rain, humidity, and high temperature

DIMENSIONS: Stainless steel washers comes in 15 different sizes: M3(15x0.8mm), M4(20x1.2mm), M4(25x1.5mm), M5(20x1.2mm), M5(25x1.4mm), M6(20x1.5mm), M6(25x1.5mm), M6(30x1.5mm), M8(20x1.4mm), M8(25x1.5mm), M8(30x1.5mm), M10(20x1.5mm), M10(25x1.5mm), M10(30x1.5mm), M12(24x1.5mm)

QUANTITY: Washers for bolts come in 15 sizes and 225 pieces overall, & each stainless-steel finish washers have a different purpose, and all products require different sizes of the washer. It comes with zip lock to prevent mixing up the sizes in a transparent box

√【Kindroufly Combination】: M3 M4 M5 M6 M8 M10 M12, total 15 sizes 270 pieces 304 stainless steel fender washers in a solid transparent storage box , different sizes and enough quantities can meet your different daily long time using.

√【High Quality Stainless】: Kindroufly large fender washers are made of 304 stainless steel, which have smooth surface, high strength, not easy to deform, corrosion resistance and rust resistance, can ensure a long time using in bad environment like high temperature, cold weather, and high humidity areas.

√【Large Fender Washers Function】: Fender washers are commonly used to prevent nuts from loosening. Our fender washers are well made, with smooth and shiny surface, highly compatible with screws, nuts and bolts of same sizes and feature solid bearing surface to prevent nut/bolt head from tearing through material.

【Sizes】M3, M4, M5, M6, M8, M10, M12 internal tooth star lock washers, total 7 sizes 320 pieces in a transparent box, different sizes can meet your different needs. Perfect accessories of shock absorption for machinery equipment. Easy to install and durable to use

【Material】High Quality 65Mn metal 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.

【Function】Internal tooth star lock washers provide spring force, grip sturdy, create more friction and resistance to rotation 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.

Note Size(Appr.): Metric flat washer assortment sets. M6 stands for the inside diameter of washer, means 6mm (1mm=.039 inch) in I.D. ALL washers are SAME thickness(1.5mm), and All washers with a wider outside diameter(25mm) Note Inside Diameter is the hole diameter, outside diameter is the round diameter.

Fast and Easy Use: Crush washers are round and flat with hole. Note the space between the lock nut and nut (1.5mm Thickness). All screws depends on the inside diameter. that means M4 washer fit with M4 screws/bolt shanks.

Multi-purpose Application: Commonly used in household. with threaded bolts, screws, nuts and flat finishing washers to tie together to prevent through. Build and repair furniture, digital products. and so on.

【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.

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

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.

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.

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.

Flat washer are used to distribute loads of threaded bolts, screws and nuts, provide a smooth-bearing surface.

Flat washers are well made, with smooth and shiny surface, which are mainly used to reduce pressure and friction, prevent leakage, isolate, loosening or disperse pressure. Suitable for indoor and outdoor usage.

Aluminium Sealing Ring Metal Gasket Crush Washer Flat Seal Ring Meson Pad