Copper Crush Washer

The Copper Crush Washer, crafted from high-quality copper, exhibits exceptional ductility and flexibility. When tightened by bolts, it deforms and compresses, fitting snugly to the contact surface, effectively filling minor imperfections and gaps and creating a reliable sealing barrier. It is widely used in sealing oil, gas, and other media in the automotive, machinery, and aviation industries. Wanzhi Steel wholesales Copper Crush Washers and Copper Flat Washers in various diameters and thicknesses. If you are interested, please contact us.

Specification

Item	Copper Crush Washer
Place of Origin	Hebei, China
Standard	AISI, ASTM, BS, DIN, JIS, GB, EN
Matching bolt grade	4.8/ 6.8/ 8.8/ 10.9/ 12.9
Aliases	Din125 copper gasket, solid copper seal, flat washer
Technology	Hot Rolled/Cold Rolled
Application	Heavy Industry, Mining, Retail Industry, General Industry, Oil
Measurement system	Metric, Imperial (Inch)
Service	OEM ODM
Color	Gold
Sample	Free Available
Payment term	TT 30% Advance + 70% Balance
Price Item	FOB, CIF, EXW, CFR, etc
Packing	Plastic Bag + Carton Box
Certification	ISO 9001, SGS, ABS, BV
MOQ	10000Pieces

What is the Copper Crush Washer?

A copper crush washer is a single-use seal made of soft copper. It’s widely used in hydraulic systems, engine oil lines, and various pipe joints. It plastically deforms (collapses) when the bolts are tightened, filling microscopic irregularities between flanges and achieving an excellent leak-proof seal. It offers high-temperature resistance, excellent conductivity, and reliable sealing properties, and requires replacement after each disassembly.

Simply put, its working principle is like hammering a piece of soft copper, forcing it to fit snugly into the gap between two surfaces, completely sealing the leak.

Features

• Material Characteristics: Made of pure copper or copper alloy, it exhibits excellent ductility and plasticity, and easily deforms under pressure.
• Sealing Principle: It relies on its own deformation to fill gaps in the sealing surface, achieving a reliable seal. It is particularly suitable for sealing surfaces with irregularities or slight wear.
• Applications: It is primarily used in high-pressure, high-temperature environments, such as automotive oil pans, hydraulic systems, gas pipelines, and other joints requiring strong sealing.
• Disposable: It is difficult to restore its original shape after deformation, and repeated use can easily lead to seal failure. It is generally recommended to replace it after a single installation.
• Corrosion Resistance: Copper has a certain degree of corrosion resistance to most oils, gases, and some chemical media, making it suitable for a variety of fluid sealing needs.

Applications

Automotive Industry

Commonly used for sealing oil pan bolts (to prevent oil leakage), transmission and engine connections, brake system pipe connections, and high-pressure fuel system joints, meeting the high-temperature and high-pressure operating conditions of automobiles.

Hydraulic and Pneumatic Systems

Used in the connecting bolts of hydraulic pumps and cylinders, or in the high-pressure pipe connections of pneumatic components, copper deforms to fill the sealing surface and prevent hydraulic oil and compressed air leakage.

Construction Machinery

Hydraulic pipe joints and engine oil channel seals in excavators and loaders, such as those in excavators and loaders, withstand the vibration and high pressures associated with mechanical operation, ensuring reliable sealing of hydraulic and lubrication systems.

Oil and Gas Industry

Suitable for sealing low-pressure gas pipeline connections, such as those for household gas valves and pipe connections in small oil transfer equipment. Copper offers a certain degree of corrosion resistance to gas and petroleum products.

Marine Equipment

Used in lubrication system connections and fuel line connections in marine engines, it withstands the vibrations of a ship’s voyage and withstands mild corrosion from surrounding seawater.

General mechanical equipment

Such as cylinder bolt seals in air compressors, oil channel connections in small generators, and pipe joints in machine tool hydraulic systems, these seals meet the sealing and pressure-resistance requirements of equipment during operation.

Aerospace (Small Components)

Used in non-critical sealing areas such as low-pressure fuel lines and lubrication system joints in some aerospace equipment. Core high-pressure areas often utilize special alloy seals.

Common specifications (by thread diameter)

Thread size (M)	Washer inner diameter (approx.)	Washer outer diameter (approx.)
M6	6.5 mm	12 mm
M8	8.5 mm	14 mm
M10	10.5 mm	16 mm
M12	12.5 mm	18 mm
M14	14.5 mm	20 mm
M16	16.5 mm	22 mm
M18	18.5 mm	24 mm
M20	20.5 mm	26 mm

Comparison with other washers

Features	Copper Crush Washer	Aluminum crush washers	Rubber Gasket
Pressure resistance	Excellent (withstands high pressures)	Good (but lower strength than copper)	Poor (easily squeezed out)
Heat resistance	-200°C to 300°C	-200°C to 200°C	-50°C to 150°C
Corrosion resistance	Excellent (most media)	Good (but susceptible to acid corrosion)	Poor (easily aged)
Reusability	Limited (disposable recommended)	Limited	Good (but sealability reduced)
Cost	High	Moderate	Low

Selection and Usage Considerations

• Hardness Matching: Choose a copper washer with a lower hardness than the connector (e.g., H62 brass) to ensure sufficient deformation without damaging the contact surface.
• Surface Treatment: For applications requiring high corrosion resistance, tin-plated or nickel-plated copper washers can be used to enhance chemical resistance.
• Installation Torque: Follow the equipment manufacturer’s recommended torque values ​​to avoid overtightening (causing gasket cracking) or undertightening (causing leaks).
• Alternatives: Aluminum gaskets can be considered in cost-sensitive or non-critical areas; rubber gaskets can be used in low-temperature or elastic sealing scenarios.

Maintenance and Storage Recommendations

• Anti-oxidation Treatment: Before long-term storage, apply a copper antioxidant (such as CY-502) to slow surface oxidation. Avoid contact with moisture and acidic substances.
• Pre-installation Inspection: Verify that the washer is free of cracks and burrs, and that the contact surfaces are clean and free of oil and dirt. Apply a small amount of grease to aid installation, but avoid excessive grease that may cause the washer to slip.

Package

FAQs

Can the copper crush washer be reused?

Absolutely not! It forms a seal by plastically deforming to fill tiny imperfections on the contact surface. Repeated use can lead to seal failure and the risk of leakage. You must replace the gasket.

What should I do if oil leakage persists after tightening?

Common causes include incorrect model, damaged contact surfaces, insufficient/excessive torque, and excessive case back pressure. You can measure the bolt diameter to confirm the washer’s inner diameter, polish the contact surface with an oilstone or sandpaper, and create a separate drain line, increasing the pipe diameter, and reducing elbows.

Can aluminum washers be used instead of copper crush washers?

It depends on the situation. Hardness, temperature resistance, and compatibility must be comprehensively evaluated. Aluminum washers can be used for low-pressure, low-temperature, and non-corrosive media. Copper washers must be used for high-temperature, high-pressure, and corrosive environments.

How do I choose the right copper crush washer?

Preferably, high-purity copper, such as H62 brass, ensures ductility and corrosion resistance. For non-standard sizes or special environments such as deep sea and extreme cold, custom copper-aluminum bimetallic washers, such as the BW-001 combination washer, can be manufactured. Select the appropriate size based on the intended use.

Copper Crush Washer Manufacturer – Wanzhi Steel

Copper crush washers, as essential disposable seals in automobiles, motorcycles, hydraulic equipment, and industrial pipelines, have a huge market potential and present vast opportunities in the manufacturing and aftermarket sectors worldwide. As a rapidly growing supplier leveraging mature technology and scale advantages, Wanzhi Steel is highly competitive in this market.

 

Why Choose Wanzhi Steel?

• Advanced Hardware and Flexible Customization: We possess numerous high-precision stamping and die equipment, enabling efficient production of washers of various sizes. We also support customization of non-standard sizes, special thicknesses, and surface treatments.
• Large-Scale Production Capacity and Pricing: Our automated production lines enable large-scale mass production, with an average daily output of hundreds of thousands of units. We effectively control costs and offer highly competitive pricing.
• Strict Quality Control System: We conduct quality inspections throughout the entire process, from raw material storage to finished product shipment. We strictly adhere to ISO quality management systems to ensure the hardness, dimensional accuracy, and sealing performance of each batch.
• Efficient Logistics and Fast Delivery: Our in-house warehouses maintain a large inventory, ensuring a rapid response to orders. Whether it’s samples or bulk orders, we guarantee timely delivery, shortening procurement cycles.

 

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Wanzhi Steel is an ISO 9001 certified steel factory, located in Hebei Province, China, specializing in the production of anti-climb spikes, Common nails, roof nails, Stainless Steel Anchor Bolts, Coil nails, and Galvanized bolts, with a monthly output of 1,800 tons. With high-quality products and good services, the products have been exported to more than 120 countries around the world.

 

 

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