Copper Seal Washer Gaskets of 2025
Best Choice1
BUSY-CORNER78 PCS 10 Sizes Copper Metric Bonded Seal Dowty Washer, Automotive Self-Centred Dowty Seal Gasket Assortment, M6/8/10/12/14/16/18/20/22/24
Main highlights- Wide Application: Bonded seal(automatic core-positioning) is use for threaded pipe fitting and plug sealing in Metric System, the Britain System and BSP. The location processing of sealing groove is not specially required, so it is ideal fitings for fast and automatic installation. It's service temperature is -30℃~120℃, working pressure less than 39.2MPA.
- Stylish Desigh: The Bonded Seal is originally designed to replace copper type washers in high-pressure systems. The copper washer ensures that the components to be connected are reliably and securely held, rubber ring generally uses oil resistant NBR rubber.
- High Quality: Seal gasket made of copper + rubber, high pressure resistant, reliable low and high pressure sealing, oil resistant, sturdy and durable for long using life. Widely used for oil lines in automobile engine，internal combustion engine, ect.
- Handy Packing: Total 78 PCS copper bonded seal assortment packed in a clear plastic case, makes it easy to find correct item quickly, saves your time of running around looking for a particular size bonded seal.
- 10 Sizes: 78pcs bonded seal set includes 10 different metric size, M6 (6PCS), M8 (6PCS), M10 (6PCS), M12 (10PCS), M14 (10PCS), M16 (10PCS), M18 (10PCS), M20 (10PCS), M22 (5PCS), M24 (5PCS).
9.9Exceptional
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Value for Money2
JMINRUN350 PCS, Premium Copper Metric Sealing Crush Washers Assortment Kit, Enhanced Flat Ring Oil Drain Plug Crush Washer Gasket Seal Set, Banjo Bolt Washers for Automotive, Motorcycles （10 Size）
Main highlights- Versatile Applications: Perfect for a wide range of applications, our copper flat washers are suitable for use in industrial, automotive, electrical, marine, and household projects. Whether you are a professional mechanic or a DIY enthusiast, these washers cater to all your sealing needs, ensuring optimal performance every time
- User-Friendly Organization: Each set comes in a durable transparent storage case with a detailed size reference chart, making it convenient to find the right size whenever you need it. This organized setup not only saves time but helps keep your workspace tidy and efficient
- Superior Material Quality: Made from high-grade red copper, our washers are specifically designed to deliver a tighter seal and enhanced high-temperature resistance. Their exceptional electrical and thermal conductivity and robust anti-corrosion properties ensure long-lasting performance, making them perfect for both heavy-duty and everyday applications
- Enhanced Compatibility: Our washers offer an ideal fit for screws, nuts, and bolts of the same sizes, providing a greater bearing surface that reduces pressure and friction. This design effectively prevents leakage and loosening, ensuring your connections are secure and reliable under various conditions
- Comprehensive Variety: Our kit includes 350 pieces of copper flat washers in 10 different sizes (M5, M6, M8, M10, M12, M14), providing you with an extensive selection to meet all your project needs. Whether you're tackling small repairs or larger automotive tasks, this assortment ensures you have the right size at your fingertips
9.8Exceptional
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3
AKOSN325 PCS, 10 Sizes, Premium Copper Metric Sealing Crush Washers Assortment Kit, Upgraded Flat Ring Oil Drain Plug Crush Washer Gasket Seal Assortment Set, Banjo Bolt Washer for Automotive, Motorcycles
Main highlights- 【Wide Applications】– Ideal for industrial, automotive, marine, hydraulic, and household uses. Suitable for electrical appliances, machinery, plumbing, and more.
- 【Secure & Protective Fit】– Designed for seamless compatibility with screws, nuts, and bolts of matching sizes. Distributes pressure evenly, reduces friction, and prevents leaks or loosening.
- 【Premium Red Copper】– Made of high-quality red copper for excellent heat resistance, electrical conductivity, and corrosion resistance. Durable, wear-resistant, and long-lasting for reliable performance.
- 【Convenient Storage】– Packed in a sturdy, transparent box with a detailed size chart for easy identification and organization. Portable and ready for immediate use.
- 【325 Pieces in 10 Sizes】– Get a versatile assortment of 325 copper flat washers (M5, M6, M8, M10, M12, M14) to meet various fastening and sealing needs. Perfect for DIY, repairs, and industrial applications.
9.7Exceptional
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4
XINGYHENGXINGYHENG 110Pcs 6 Kinds Copper Sealing Washers Copper Flat Gasket Oil Sealing Washer Box 1/4’’ 5/16’’ 3/8’’ 7/16’’ 1/2’’ 5/8’’
Main highlights- Wide uses: Perfect for home DIY, automotive, shop use, mechanics, car garage, power equipment, trucks, lawn mower, small engine repair.
- Super material: It is made of copper. Copper material is selected for high conductivity, anti-corrosion and wear resistance, have a tighter seal and high heat resistance than steel and rubber washers, suitable for all kinds of scenes, produces an anti-oxidation layer on the surface of the material and acts as a non-rusting agent, good tensile strength, durable.
- Package quantity and mode: In this flat washers kit, It includes 110Pcs metric flat washers: 1/4’’(30pcs), 5/16’’ (25pcs), 3/8’’ (20pcs), 7/16’’(15pcs), 1/2’’(10pcs), 5/8’’(10pcs). Complete species meet your all demand. They are packed in a transparent storage case for quick access and protection.
- Function: Flat washers are usually used to prevent nuts from loosening, reduce vibration and protect parts. Washer's surface are smooth can reduces friction between the fasteners, preventing isolates, preventing loosening and dispersion pressure, no burr, excellent workmanship, durable.
- Character: Highly compatible with screws, nuts and bolts of same sizes and feature solid bearing surface to prevent nut/bolt head from tearing through material. Easy to operate, standard size, not easy to slip , more convenient and quick to use.
9.5Excellent
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5
Magicave330 Pcs Copper Washers Assortment Kit – 12 Sizes Flat Sealing Crush Washers (M5-M20) for Automotive, Plumbing, and Mechanical Use
Main highlights- Versatile Applications: From automotive repairs to industrial tasks, these copper washers excel in a range of uses, including sump plugs, fuel fittings, hydraulic systems, electronics, and more. They’re especially effective when used as oil drain plug crush washers, ensuring a secure seal to prevent messy leaks and extend component life.
- Enhanced Performance: Engineered for precise load distribution, our copper washers minimize heat and friction during tightening, ensuring a leak-proof seal. Thanks to their superior conductivity and corrosion resistance, they outperform steel and rubber alternatives in durability and efficiency—making them ideal for crush washer replacements or critical oil drain plug crush washer needs.
- Durable Construction: Crafted from high-quality copper, these washers deliver excellent wear, corrosion, and rust resistance. Designed to handle tough conditions, they are the perfect choice for replacing an oil drain plug crush washer or ensuring reliable seals in demanding applications.
- Convenient Packaging: Neatly organized in a durable, clear plastic box, this copper washer kit keeps your workspace tidy and ensures quick access to the size you need. Whether you're assembling a crush washer assortment for routine maintenance or addressing an urgent oil drain plug crush washer repair, this kit is built for your convenience.
- Comprehensive Set: This kit includes 330 premium copper washers in 12 sizes (M5, M6, M8, M10, M12, M14, M16, M20). With a wide variety of sizes and plenty of each, you’ll always have the right crush washer or sealing solution, whether you’re tackling DIY repairs or professional maintenance tasks.
9.4Excellent
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6
FamgeeFamgee 200 Pcs Copper Washers Engine Seal Flat Ring Gasket Fastener Metric Sealing Washer Assortment Set - 9 Sizes
Main highlights- Widely Used - Perfect for Electrical Connections in Household and Commercial Appliances, automotive and marine uses. Suitable all types of Car, Marine, Generators, Machinery and Plant
- Material: Copper. Melting point up to 1083℃. Good electrical conductivity and thermal conductivity. Copper Provides a Tighter Seal and Greater Heat Endurance than Steel and Rubber Washers
- Durable, preservative, heat resistant, high voltage resistance
- Disperse Pressure, Shock Absorption, Sealing and Fastening. Flat washers can spread a load, prevent damage to the surface being fixed, insulate steel screws from surface, prevent leakage and Loosening
- 200 Pcs Flat Ring Copper Washer Gasket Assortment,contains 9 popular sizes for different applications. Thickness: 1~1.5mm (Approx. 0.04"~0.06", as shown in the images)
9.3Excellent
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7
VKVXCLON325 Pcs 10 Sizes Copper Washers Kit, Copper Crush Sealing Washers Assortment Kit Metric Flat Washers Oil Drain Plug Crush Washer Gasket for Automotive, Motorcycles
Main highlights- Widely : Copper washers kit widely apply for marines, boat, hydraulic fittings, various electric appliance, fuel, bearings, air pumps water pumps,hardware, precision instruments and household projects.etc
- Special Design : Crush washer oil drain plug packed in a durable transparent box and have label in box with a detailed size reference chart, can easy to pick correct oil plug gasket quickly and used
- Size : Total contain 10sizes : M5,M6,M8,M10,M12,M14, 325 pieces copper washers, multiple different size meet your various home DIY demands
- Material : Copper crush washer kit made of high quality copper, which have smooth surface, corrosion resistance, wear resistance and rust resistance, it tighter seal and higher heat resistance than steel and rubber washers
- Function : Copper crush sealing washers apply to oil lines hydraulic fittings,oil drain, which can reduce pressure and friction, prevents leakage, isolates, prevents loosening or dispersion pressure, ensuring your connections are secure and reliable under various conditions
9.2Excellent
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8
LordHardware10% OffLordHardware 200pcs Copper Crush Metric Washers Assortment Kit Flat Sealing Washer M5 M6 M8 M10 M12 M14 (9 Sizes)
Main highlights- Storage Box: 200pcs washers are organized in a sturdy convenient storage case
- Size: 9 size copper flat crush washers, include M5, M6, M8, M10, M12 and M14
- High Qulity: Made of high quality red copper, provides high temperature resistance, high conductivity and tighter seal; works great in wet environment
- Buy with Confidence: Free return for mistaken purchase. If there is any problem, please feel free to contact us, we will try our best to solve your problem
- Application: Widely used for electrical connections, such as household, commercial appliances, automotive and marine, fuel, hydraulic fittings etc.
9.1Excellent
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9
NACXM12 Flat Washer Copper Sealing Ring, 12mm ID 18mm OD 1.5mm Thickness Metric Sealing Gasket, 50 Pieces
Main highlights- Widely used in various environments pertaindraulicing to hy fittings, water, fuel, and sump plugs.
- Specialized material provides fine workmanship, smooth surface and no burr for good results.
- 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.
8.8Very Good
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10
AnyhutAnyhut 200 PCS Car Crush Washers Kit, 9 Sizes Copper Metric Washers Flat Ring Copper Washers Assortment, Oil Drain Plug Copper Sealing Washers Gasket, Universal for Most Cars (Gold)
Main highlights- Wide Application: Copper washers are widely used. They can be used for sealing oil circuits of automobile engines, fastening joints of pipeline systems, and connecting fine parts of electronic instrument.
- Multiple Sizes: The copper washers in this set include 9 sizes, namely M5, M6, M8, M10, M12, M14, with a total of 200 pieces. Copper washers of different sizes can meet your diverse application needs in daily use.
- High Quality: The copper washers are made of high-quality pure copper materials, possess good hardness and strength. They can fit tightly with various components and are not prone to deformation, damage, cracking, or loss of elasticity.
- Function: The copper washers can be placed between two connected parts to ensure the sealing inside the equipment. They can reduce wear and looseness caused by vibration between parts and also have an anti-corrosion function to protect the connected parts from being corroded.
- Easy to Store: The 200 pieces of copper washers are classified and placed in 9 sizes in the PP set box, which is convenient for storage and retrieval, while preventing the washers from being damaged or lost during transportation or storage.
8.7Very Good
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