Best M4 Lock Washers in 2026

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Products including all types of screws, rivets, socket head cap screws, flange bolts and nuts, concrete anchors, split pins, stainless steel fasteners, brackets, U-bolts; in fact virtually anything!

GALVANIZED STAINLESS STEEL: These lock and flat washers provide excellent protection and security for nuts and bolts. They are made with galvanized stainless steel for long-term use and outstanding durability.

VERSATILE & COMPATIBLE: These assorted washers come in multiple sizes to fit all your screws, nuts, and bolts. Each washer features a solid bearing surface to prevent the nut or bolt head from tearing through the material.

OPTIMAL SURFACE AREA: Each stainless-steel flat or lock washer easily deflects the screw or bolt load, spreading the weight evenly for a secure and sure fit. These washers for screws and bolts are ideal for use at home or in the workshop.

【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.

Commonly used in applications using a bolt or a screw where two pieces are being joined together

Split ends grip the material surface to prevent loosening during vibration

18-8 Stainless Steel finish for good corrosion resistance

Quality and strong standard type 400 series stainless steel

Each pack is professionally heat sealed and labeled by Marine Bolt Supply

Offered in convenient small or large quantity packs

【✔】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

√【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.

【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.

Internal 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 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】

♛ 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.

【✔】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

♛【Package Includes】: It contains 100pcs 8mm x 25mm large fender washers, thickness are 1.2mm. Sufficient quantities can satisfy almost all your needs in daily life and work.

♛【High Quality Material】: All the flat washers are made of high quality 304 stainless steel, which has good performance of high hardness, corrosion resistance and rust resistance even in bad environment like high temperature, cold weather, and high humidity areas, ensures long service time.

♛【Function and Use】: 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.

➤【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 STAINLESS: These 100 Piece Lock Washers are 100% 18-8 (304) Stainless Steel which is one of the highest forms of corrosion resistant steel, making it last longer than other hardware on the market today.

WASHERS THAT YOU CAN DEPEND ON: Our hardware is very strong and is great for both indoor and outdoor use. The stainless steel is superior to regular steel and provides excellent rust resistance in water applications.

GREAT TO KEEP AROUND: Persberg hardware is great to have around for use in wood and wet environments. Persberg washers are the highest quality available on the market and we stand by our claim 100%. They are strong, corrosion resistant and will support all of your projects.

Product 1: Professional Performance: Easy-to-assemble and easy-to-start with its HONDA GX200 commercial series engine, the Aluminum Series power washer is great for contractors who specialize in deck cleaning, wood restoration, and all other professional services

Product 1: Power and Durability: A powerful, reliable, maintenance-free CAT Industrial triplex plunger pump delivers 3400 PSI at 2.5 GPM and includes thermal relief to prevent overheating

Product 1: Sturdy and Portable: The aircraft grade aluminum platform with brushed extruded aluminum tubing offers durability and corrosion resistance; 10-inch premium pneumatic tires deliver ease of maneuverability across various terrain and uneven ground

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

Washer game set includes two 12.3" x 12.3" x 3.2"H felt-lined washer targets latched together, 8 washer (4 red, 4 blue). The exterior is made of painting finish to protect against scuffs and scratches.

For all ages and skill levels(Target distance may be changed based on skill levels of players.Targets lock together for easy transport with convenient carry handle.

Sturdy wood construction with plastic coated steel washers .Quick and easy to Set up!(Comes with game rules)

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

☞ Material: 65Mn Steel

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

☞ Main Color: Black;

→Product: Starlock Washer Assortment Kit;

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

→Package: 220pcs x Starlock Washers

Package Includes: 100 PCS M8 Metric Split Lock Washer

Specifications: outside diameter 13.1mm; inside diameter 8.7mm; compressed height 2.2mm; uncompressed height 5.25mm

Lock washers are commonly used in any application using a bolt where two pieces are being drawn together

Lock Washers ensure a tight assembly

Plain Steel fasteners are suitable where strength and value are the primary considerations

Size Name corresponds to matching screw or bolt size

Dimensions: OD = .47", ID = .256" Thickness = .028"

Quality and strong standard type 400 series stainless steel

Each pack is professionally heat sealed and labeled by Marine Bolt Supply

Nord-Lock wedge-locking washers are made specifically for use with M8 steel bolts. The serrated washers are also compatible with 5/16 inch bolts.

Each pack contains 20 glued pairs of washers.

Applications for Nord-Lock Carbon Steel washers include general steel applications.

➤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

304 stainless steel Inner diameter 1/4 inch split lock washer.

For use with 1/4 inch bolts and machine screws.

Great corrosion resistance for outside applications.

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.