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.

√ 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.

COMPLETE HOME RUBBER WASHER REPAIR KIT: The Danco Home Washer assortment comes with the most popular and widely used washers and includes 42 pieces in various metric and inch standard sizes for your convenience

RUBBER WASHERS - VARIED ASSORTMENT - Includes a varied assortment of washers ranging from faucet washers, hose washers, slip join washers, o-rings, sink strainer washers and bibb screws

SMALL RED WASHERS - The small red washers are specialized for outdoor spigots

【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: 100% copper, high conductivity, corrosion resistant copper washer assortment

150PCS 15 Popular Sizes Sealing Washers Kit, great for sump plugs, water, fuel, and hydraulic fittings

150 pcs solid copper sump plug washer set. All contained in a compact and see through compartmented plastic case, convenience to use.

Product Name: Copper Washer; Inner Diameter: 12mm/0.47"

Outer Diameter: 18mm/0.7"; Thickness: 1.5mm/0.05"

High quality copper washers are constructed to uphold strength and ultimate durability during tough operations.

♛ 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

『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

★『Product Type』: High quality large penny fender washers assortment set.

★『High Quality Meterial』: All the flat washers are made of 304 stainless steel, which 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.

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

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;

COMPLETE HOME RUBBER WASHER REPAIR KIT: The flat washer assortment comes with the most popular assortment needed for DIY or professional plumbing repairs

EXCELLENT ASSORTMENT: This faucet washer kit includes various metric and inch standard sizes for your convenience, 10 sizes ranging from 00 to 5/8

REPAIR LEAKY FAUCET - Replacing worn-out washers on a faucet stem helps repair a leaky faucet and is an inexpensive alternative to replacing an entire faucet fixture, saving water, money and expensive plumbing repairs

♛ 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

Flat washer provides a bearing surface for fastener load distribution or acts as a spacer

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

Zinc plating resists corrosion and has a reflective appearance

√【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.

Product Name: Copper Washer; Inner Diameter: 10mm/0.39" Outer Diameter: 14mm/0.55"; Thickness: 1.5mm/0.06"

Copper Provides a Tighter Seal and Greater Heat Endurance than Steel and Rubber Washers.

Max Operation temperature: 350C Max Operation pressure:16MPa Melting point: 1083C

√【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.

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.

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.

Quantity:89 pieces metric O rings classification kit,there are 15 sizes.

Material:The white one is silicone，Transparent is rubber，Black is Nitrile Rubber.

Application: for Faucet Pipe Water Hose，Faucet Areator，Filter Hose Washers,Gas pipe gaskets.

Flat washer provides a bearing surface for fastener load distribution or acts as a spacer

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

Zinc plating resists corrosion and has a reflective appearance

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"

【You will receive】5 sizes of flat washers, each size has 50 pieces, can meet your different needs

【High quality】These spacers are 100% solid rubber, high temperature resistance, wear resistance, longer service life

【Function】Flat washers are smooth and burr-free, metric sealing washers are mainly used to reduce pressure and friction, prevent leakage, isolate, loosen or disperse pressure

Package Include: In this copper washer set, you can get a total of 160 assorted copper washers, including 12 metric flat washer sizes:M5, M6, M8, M10, M12, M14 M16, M20.

100% Copper Content: All flat washers are made of pure copper. Compared to steel and rubber gaskets, copper gaskets are more resistant to sealing, heat, corrosion and electrical conductivity.

Highly Functional: Copper washers with smooth and shiny surface can reduce the friction between screws and nuts to prevent loosening or disperse their pressure. It can also protect the surface of the connection surface to prevent damage.