Best M12 Flat Washers in 2026

【Size】12 sizes 300 pieces copper washers assortment kit, include M5 M6 M8 M10 M12 M14 M16 M20, different sizes can meet your different needs.

【Material】 All flat washers are made of copper, have a tighter seal and high heat resistance than steel and rubber washers. Copper washers are corrosion resistant in wet environments, nonmagnetic, and electrically conductive.

【Functions】Used with nuts and bolts and provide a greater bearing surface to prevent the nut or bolt head tearing through the fastened material, flat washers are used to support and spread the load across the baring area of the bolt and nut to prevent pull through.

【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.

√ SIZES - M6 M8 M10 M12 M14 M16 M18 M20

√ PACKAGE - 150pcs ,8 Sizes of the most commonly used flat copper washers in a case

√ COPPER Material - Flat Washers made of copper, have a tighter seal and high heat resistance than steel and rubber washers.

🔩【Multi-function】XOOL Flat Washer kit is great for odds and ends are when you just need a piece to finish a project. The high quality assortment washers are ideal for home, automotive, and shop use. And the Flat Washer used to spread the load of a screwed fastening. Additionally, the plain washer may be used when the hole is a larger diameter than the fixing nut.

🔩【High Quality】XOOL Flat Washers are made of high quality 304 stainless steel(Raw material). The 304 stainless steel material features strength and offers good corrosion resistance in bad environment like high temperature, cold weather, and high humidity areas. They have superior rust resistance and the excellent of oxidation resistance, which can ensure long time using.

🔩【Safe & Convenient】XOOL Plain Washers adopt high quality material, which is environmental protection , non- mercury and non-poisonous. In the process of using, there are no toxic substances releasing to ensure your safety. The nice Flat Washer assortment kit has plenty of the popular sizes, which will meet all of your home DIY need. And you don’t need to search for dropped washers, just use one new washer. The 380 pcs washers and 8 different sizes will meet your maximal requirement.

√【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.

Material: 304 Stainless Steel, corrosion resistant

Size: M2 M2.5 M3 M4 M5 M6 M8 M10 M12

Quantity: It contains 684pcs/9 Sizes of the most commonly used Stainless Steel washers

♛ 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 Brass Flat Washer Assortment Kit

♛ Made of Brass, providing the good resisitance to corrosion and high temperature

♛ Set Includes 10 Most-used Sizes (Metric): M2 M2.5 M3 M4 M5 M6 M8 M10 M12 M14. (Please see figure 2 for specific size)

√ Size:M6 M8 M10 M12 M14 M16 M18 M20

√ Material: Copper, high conductivity, corrosion resistant

√ Quantity: It contains 150pcs/8 Sizes of the most commonly used copper washers

【Sizes】M3 M4 M5 M6 M8 M10 M12, total 240 pieces/15 sizes of the most commonly used stainless steel washers in a plastic case, different size can satisfy your different needs.

【Design】Flat 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.

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 Meterial』: All the flat washers are made of copper, which with high conductivity, corrosion resistant. They have a tighter seal and high heat resistance than steel and rubber washers

『Good Performance』: These most commonly used copper washers have superior rust resistance and the excellent of oxidation resistance, which can ensure long time using and prolong screws lifespan, great for sump plugs, water, fuel and hydraulic fittings

『Easy to Use』: They are very easy to install, the washer's surface are smooth can reduces friction between the screw and nut, prevents leakage, isolates, prevents loosening or dispersion pressure

Size: 9 size copper flat crush washers, include M5, M6, M8, M10, M12 and M14

Storage Box: 200pcs washers are organized in a sturdy convenient storage case

High Qulity: Made of high quality red copper, provides high temperature resistance, high conductivity and tighter seal; works great in wet environment

Material: Nylon

It contains 500pieces/8 Sizes of the most commonly used Nylon washers

Size:M2 M2.5 M3 M4 M5 M6 M8 M10

♛【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

Metric 8 sizes Screw/Bolt Nylon Flat Washer white color total 550 pieces;

Suitable for metric M2, M2.5, M3, M4, M5, M6, M8 ,M10 screws/bolt;

All products are made of durable nylon, Strong,anticorrosive;

【Different Sizes of Flat Washer】The nylon flat washer assortment kit contains 8 different common used sizes including M2, M2.5, M3, M4, M5, M6, M8 and M10. You can choose the suitable flat washer according to your diverse screws and bolts.

【High-quality Material】 Made of Nylon, flat washers are wear-resisting and moisture resistant, ensuring long lasting service life. In addition, you can rest assured that the flat washer will prevent electrical shorts between metal and metal.

【Wide Range of Applications】 Our flat washer can effectively serve as a bearing surface for fastener load distribution and resistance to abrasion. In this way, it is perfect for threaded/bolt-type connections on both commercial and household appliances, such as aerospace industry, interior decoration and fitness equipment.

♛ High Quality Nylon Flat Washers Assortment Kit

♛ Made of Nylon, Used for motherboard to prevent electrical short from metal to metal contact.

♛ Set Includes 10 Most-used Sizes (Metric): M2 M2.5 M3 M4 M5 M6 M8 M10 M12. (Please see figure 2 for specific size)

🥰【High quality and durable material】URLWALL Flat Washer Set is made of plastic nylon material, smooth without burr. Features: Insulation, heat insulation, wear-resisting corrosion resistance, long service life.

🥰【Full size】It contains 500 Pieces / M2, M2.5, M3, M4, M5, M6, M8, M10 flat wahers.8 different sizes of nylon flat spacer, can meeting your different needs.

🥰【Good protection】Metric sealing NYLON washers mainly used to reduce pressure and friction, prevent leakage, isolate, loosening or disperse pressure.Also to increase contact area, reduce pressure and protect parts and screws.

❤ 1, HIGH QUALITY MATERIAL ---- High quality pure copper material, fine workmanship, smooth surface, no burr, durable, long service life, not easy to damage, the material itself luster can be preserved for 10 years and 20 years as new.

❤ 2, WIDE 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

❤ 3, EASY TO USE ---- Sturdy and durable, great corrosion resistance for outside applications, easy to install. Flat washers are used to support and spread the load across the baring area of the bolt and nut to prevent pull through

Nylon washer, corrosion resistance and wear resistance.

8 common sizes, meeting your different demand.

Fits M2, M2.5, M3, M4, M5, M6, M8, M10 screws bolt.

Size:M8

Inner diameter：0.3”/8mm; Outer diameter:0.6”/16mm; Thickness:0.06”/1.5mm

Steel is often used in applications where strength is the primary consideration

√【Kindroufly Combination】: M5 M6 M8 M10 M12 M14 M16 M20, total 11 sizes 320 pieces copper sealing washers, different sizes and enough quantities can meet your different daily needs.

√【High Quality Copper】: Kindroufly copper washers are high quality copper material, which have smooth surface, wear resistance, corrosion resistance and rust resistance, can ensure a long time using in bad environment like high temperature, cold weather, and high humidity areas.

√【Copper Washers Function】: High conductivity, corrosion resistant copper material provides a tighter seal and greater heat endurance than steel and rubber washers, and play the role of protection and stability Our copper washers are well made, with smooth and shiny surface, highly compatible with screws, nuts and bolts of same sizes.

√【Kindroufly Combination】: M5 M6 M8 M10 M12 M14 M16, total 10 sizes 225 pieces copper sealing washers, different sizes and enough quantities can meet your different daily needs.

√【High Quality Copper】: Kindroufly copper washers are high quality copper material, which have smooth surface, wear resistance, corrosion resistance and rust resistance, can ensure a long time using in bad environment like high temperature, cold weather, and high humidity areas.

√【Copper Washers Function】: High conductivity, corrosion resistant copper material provides a tighter seal and greater heat endurance than steel and rubber washers, and play the role of protection and stability Our copper washers are well made, with smooth and shiny surface, highly compatible with screws, nuts and bolts of same sizes.

➤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

√【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.

1. Quantity: 100pcs/set heavy duty

2. Size: 8mm inner diameter, 16mm outer diameter, 1.6mm thickness

3. These 100 Piece Flat Washers are 100% 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.

1141 Pieces - Inch & Metric Stainless Steel Hex Nut, Lock Washer and Flat Washer Assortment Kit!

1/4", 5/16", 3/8" 1/2", M6, M8, M10, M12 Diameters Included

Includes: Durham 24 Hole Steel Compartment Tray (Made USA) Dim: 13-3/8"x9-1/4"x2"