Best M4 Lock Washers in 2026

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.

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

【✔】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 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.

1. 304 Stainless Steel Spring Lock Washers Set，Good Corrosion Resistance, It Can Be Used in a Humid Environment.

2. 7 Most Used Sizes: M2.5 M3 M4 M5 M6 M8 M10, Flat & Lock

3. 260 Pieces，Packed in A Sturdy Transparent Plastic Case

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.

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

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.

🔧【DIMENSION】#10-32

🔧【MATERIAL】Keps Nut made of 304（18-8） stainless steel, good thermal conductivity and heat resistance, firm and corrosion resistant, can ensure long time using.

🔧【EASY TO USE】K-Lock Nuts feature a built in external tooth lock washer that is free spinning, The teeth on the lock washer can bite into the surface and help lock the nut into place.

【Sizes】M2 M2.5 M3 M4 M5 M6 M8 M10 M12, total 900 pieces/9 sizes of the most commonly used stainless steel spring lock washers, metal lock washers in a plastic case, different sizes can satisfy your different needs.

【Design】Lock washers, spring lock washers, metal lock 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】304 Stainless Steel, stainless 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.

【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.

Material: Our Sealing Gasket Is Made Of 304 Stainless Steel And Epdm Rubber, Durable And Long Life With Good Rust Resistance, You Do Not Have To Feel Frustrated By Rust

Package Quantity: Our Products Are Strictly Controlled By The Quantity Of Each Package, And Packed In A Strong And Durable Box, You Do Not Have To Worry About Receiving A Broken Package And The Number Of Packages Does Not Match The Actual

Features: The Sealing Washer Is Rubber On One Side And Metal On The Other Side Of The Washer. Suitable For Use In Metal Plates, The Rubber Helps To Solve The Problem Of Vibration Noise, The Gasket Helps To Improve The Friction Of The Screw To Enhance The Sturdiness, They Are Good Helpers For Your Work.

WHAT YOU GET: 100 stainless steel #8x3/8" Spring Lock Washers ideal for use in sheet metal and wet environments with very high form corrosion resistance in 304 material

304 MATERIAL: Our Spring Lock Washers are made of 304 stainless steel, which is longer lasting than other hardware on the market and will last longer in harsh environments such as high temperature, low temperature and high humidity.

WIDELY USED: Our Spring Lock Washers can be used to fix bolts with diameter smaller than the hole of the washer, suitable for general industry such as indoor decoration, outdoor construction, electrical repair and furniture repair.

WHAT YOU GET: 100 stainless steel 1/4"x1 flat pads ideal for use in sheet metal and wet environments with very high form corrosion resistance in 304 material

304 MATERIAL: Our pads are made of 304 stainless steel, which is longer lasting than other hardware on the market and will last longer in harsh environments such as high temperature, low temperature and high humidity.

WIDELY USED: Our flat pad can be used to fix bolts with diameter smaller than the hole of the washer, suitable for general industry such as indoor decoration, outdoor construction, electrical repair and furniture repair.