Best M18 Sealing 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.

1. Quantity: 20pcs/set (1 sizes: M12)

2. Material: Copper, high conductivity, corrosion resistant

3.High conductivity, corrosion resistant copper washer assortment, Replacement for sump plugs, water, fuel and hydraulic fittings

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.

√ 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

❤ 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

√【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.

Material :Copper

Quantity: It contains 280Pcs/12 Sizes of the most commonly used copper washers.

Wide

Wide Range Of Uses: Flat washers are commonly used to prevent nuts from loosening, be compatible with screws, and be suitable for interior decoration, outdoor construction, electrical repair, and furniture repair.

Functions: Flat washers are mainly used to reduce pressure and friction, prevent leakage, isolate, loosening or disperse pressure. High quality and durable to ensure life-time use.

Brass Copper Sealing Boat Crush Washer Flat Gasket Ring Sump Plug 0.5mm

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.