M4 Copper Plain Washers – Durable Flat Washers for Precision Fastening Solutions

Nafees Metal Industries proudly introduces M4 Copper Plain Washers, engineered to deliver high performance and reliability in small-scale, high-precision industrial applications. As a leading manufacturer and exporter of copper washers in India, we specialize in crafting washers that offer superior thermal conductivity, corrosion resistance, and mechanical strength.

Our M4 Copper Plain Washer is the perfect solution for professionals who demand durability, precision, and consistent performance. These washers are designed to fit M4 bolts and screws seamlessly, offering optimal load distribution and preventing fastener-induced damage to the substrate.

Whether you are in electronics assembly, plumbing, automotive repair, or instrumentation, our M4 Copper Plain Washer ensures dependable sealing and fastening, even in high-temperature and corrosive environments.

Key attributes of our M4 Copper Plain Washer include:

• Exceptional corrosion resistance for long-term applications.

• High ductility and malleability for tight seal formation.

• Perfect for thermal and electrical conductivity requirements.

• Manufactured as per international standards with exact dimensional accuracy.

At Nafees Metal Industries, we are proud to be among the best copper washer manufacturers in India, offering a wide range of copper washer sizes, types, and surface finishes suitable for industrial, commercial, and export-grade demands.

What Are M4 Copper Plain Washers?

M4 Copper Plain Washers are flat, circular metal components with a central hole designed to fit M4 bolts and screws (4 mm diameter). They are widely used across industrial and engineering applications to distribute load, reduce friction, prevent wear, and ensure a secure fastening system.

Each M4 Copper Plain Washer from Nafees Metal Industries is made from premium-grade copper, known for its outstanding thermal and electrical conductivity. This makes them ideal for high-precision, high-resistance applications such as electronics, automotive, HVAC systems, and fluid sealing assemblies.

Copper is naturally resistant to rust and chemical corrosion, which enhances the washer’s lifespan—especially in wet, chemical-exposed, or high-temperature conditions. These washers serve both structural and sealing purposes, providing strength under compression and effective protection to sensitive surfaces.

Key Functions of an M4 Copper Plain Washer:

• Even load distribution under nuts and bolt heads.

• Protection of surfaces from pressure-induced damage.

• Increased clamping area to prevent material distortion.

• Acts as a barrier to leakage in fluid-based systems.

Our washers are built with strict dimensional accuracy, offering seamless fitment and alignment with M4 fasteners. Whether you need copper washer sizes for OEM production or routine maintenance, our M4 Copper Plain Washer is a versatile solution engineered for reliability.

This product also fulfills customer requirements searching for:

• M4 copper washer seal (for hydraulic/pneumatic fittings)

• copper flat washer M4 size (for technical specifications)

• copper washer (broad search term)

• flat washer copper (material-specific generic query)

As one of the best manufacturers of copper washers in India, Nafees Metal Industries supplies both standard and custom-sized M4 washers in bulk quantities for domestic and international clients.

Why Choose Copper for M4 Washers?

Copper is a highly preferred material in washer manufacturing due to its unique combination of mechanical, thermal, and chemical properties. At Nafees Metal Industries, our M4 Copper Plain Washer stands out as a high-performance fastening component that delivers consistent reliability across demanding applications.

Benefits of Copper in M4 Washers:

1. Excellent Thermal Conductivity
The M4 Copper Plain Washer can dissipate heat efficiently, making it ideal for electrical and thermal systems such as PCB mounting, transformers, and high-temperature assemblies. This reduces overheating and ensures long-term operational stability.

2. Superior Corrosion Resistance
Copper forms a protective oxide layer that resists corrosion from moisture, air, and various chemicals. Our M4 Copper Plain Washer performs exceptionally well in plumbing, marine, HVAC, and chemical environments.

3. High Malleability & Ductility
Copper can be deformed under stress without cracking. This enables the M4 Copper Plain Washer to form tight seals and absorb vibrations, protecting surfaces during assembly.

4. Strong Electrical Conductivity
Used widely in electrical installations, the M4 Copper Plain Washer provides low-resistance paths for current, improving grounding performance and circuit stability.

5. Non-Magnetic and Spark-Resistant
Copper is non-ferrous and safe for sensitive environments. This makes the M4 Copper Plain Washer suitable for aerospace, fuel systems, and explosion-prone work areas.

6. Recyclable and Environmentally Friendly
Copper washers are sustainable. By choosing an M4 Copper Plain Washer, you’re not only choosing performance but also contributing to eco-conscious industrial practices.

Use Copper Washers Where It Matters Most

Whether you’re sealing hydraulic fittings, assembling precision instruments, or working on electronics, the M4 Copper Plain Washer ensures strength, safety, and superior sealing. It’s no surprise that industries around the world trust copper washers in high-pressure and high-temperature operations.

As one of the top copper washer suppliers and manufacturers in India, Nafees Metal Industries delivers high-grade M4 Copper Plain Washers that combine performance and precision for reliable fastening in every condition.

How Are M4 Copper Plain Washers Manufactured?

At Nafees Metal Industries, every M4 Copper Plain Washer is manufactured with utmost precision using advanced metal-forming techniques and ISO-compliant quality control systems. Our manufacturing process is designed to ensure consistent quality, exact fitment, and exceptional durability — no matter the quantity ordered.

Here’s how we manufacture high-performance M4 Copper Plain Washers:

1. Raw Material Selection

We source high-purity, low-oxygen copper coils specifically chosen for their superior mechanical strength, conductivity, and corrosion resistance. The copper is inspected for composition and uniformity before entering the production cycle.

2. Cold Stamping Process

Sheets of copper are cold stamped using high-tonnage presses to punch out flat disc washers precisely sized for M4 fasteners. The punching dies are designed to meet DIN 125 / IS 2016 / ISO 7089 standards, ensuring tight dimensional tolerance for the inner and outer diameters.

3. Deburring and Edge Finishing

Once stamped, each M4 Copper Plain Washer undergoes a deburring process to eliminate any sharp edges or surface imperfections. We use vibratory tumbling and edge-finishing machines to provide smooth, safe handling and easy integration in assembly lines.

4. Annealing (Optional)

Based on client requirements, washers can be heat-treated to increase softness or ductility. Annealing makes the M4 Copper Plain Washer more flexible and better suited for sealing high-pressure joints or fluid systems.

5. Surface Treatment (Optional)

Though copper naturally resists corrosion, we also offer additional surface finishes (tin plating or nickel coating) on request. These finishes enhance conductivity, extend product life, and provide aesthetic uniformity.

6. Dimensional & Visual Inspection

Each batch of M4 Copper Plain Washers is tested for:

• Inner Diameter and Outer Diameter accuracy

• Thickness uniformity

• Flatness and concentricity

• Burr-free edges

• Surface appearance

7. Packaging and Dispatch

Washers are packed in moisture-resistant polybags, cartons, or custom-labeled export boxes. Bulk or small packs are available depending on your requirement. We also support private labeling and barcode printing for OEM clients.

As one of the best manufacturers of copper washers in India, Nafees Metal Industries combines craftsmanship, automation, and experience to deliver unmatched quality in every M4 Copper Plain Washer produced.

Key Features of M4 Copper Plain Washers

The M4 Copper Plain Washer from Nafees Metal Industries is engineered for excellence, offering a perfect balance of strength, conductivity, and precision. Designed for both general and high-performance applications, these washers deliver outstanding utility in a wide range of industries.

Here are the defining features that make our M4 Copper Plain Washer a preferred choice:

1. Accurate Fitment for M4 Bolts
Each washer is precisely dimensioned to fit M4 screws and bolts (4 mm diameter), ensuring easy assembly and reliable fastening.

2. High Corrosion Resistance
Made from pure copper, the washers naturally resist moisture, oxidation, and chemical degradation, making them ideal for marine, plumbing, and chemical plant applications.

3. Excellent Conductivity
The M4 Copper Plain Washer enhances electrical and thermal conductivity in assemblies, making it suitable for electronic devices, grounding circuits, and battery terminals.

4. Uniform Thickness and Smooth Finish
Every washer is processed to maintain uniform thickness and polished edges, reducing risk of surface damage during assembly.

5. Flexible Customization Options
We provide M4 Copper Plain Washers in plain, annealed, or plated forms with optional surface treatments like tin or nickel plating.

6. Durable Material Composition
These washers retain structural integrity under pressure and heat, ensuring long-lasting performance in industrial environments.

7. Bulk Supply Ready
Nafees Metal Industries maintains a ready-to-dispatch stock of M4 washers in bulk, catering to OEMs, contractors, MROs, and international distributors.

8. Meets International Standards
All M4 Copper Plain Washers are manufactured in compliance with DIN 125 / IS 2016 / ISO 7089, guaranteeing reliability and global compatibility.

9. Safe Handling and Packaging
Washers are deburred and packed in safe, moisture-resistant packaging for ease of transport, handling, and storage.

10. Made in India by Experts
Proudly manufactured at our Mumbai facility, each washer reflects the expertise and precision of one of the best copper washer manufacturers in India.

Technical Specifications

Our M4 Copper Plain Washer is manufactured with strict adherence to international quality and dimensional standards. The table below provides detailed specifications to assist in engineering, procurement, and industrial applications.

Every M4 Copper Plain Washer is tested for dimensional tolerance, surface finish, and mechanical consistency before dispatch. Custom specifications and bulk inquiries are handled by our in-house technical team.

Applications of M4 Copper Plain Washers

The M4 Copper Plain Washer is a highly versatile component used across a broad range of industries where durability, conductivity, and precision fastening are essential. At Nafees Metal Industries, we design our washers to meet the specific needs of industries requiring compact and high-performing fasteners.

Below are key application segments where the M4 Copper Plain Washer plays a critical role:

1. Electronics and PCB Assembly

In sensitive electronic assemblies, M4 screws are frequently used to secure PCBs, components, and heat sinks. The M4 Copper Plain Washer helps distribute load evenly, prevents damage to delicate surfaces, and enhances electrical conductivity for grounding and EMI shielding.

2. Automotive and Auto-Electrical Systems

Automotive applications rely on M4 Copper Plain Washers for sealing electrical terminals, sensor mounts, and ECU enclosures. Their corrosion resistance and spark-free nature make them ideal for high-vibration and high-temperature environments.

3. Plumbing and HVAC Fittings

The M4 copper washer seal variant is used in pressure sealing between joints and threaded fittings in plumbing systems. It ensures leak prevention and long-term integrity, especially in heating, ventilation, and cooling units.

4. Aerospace and Defense

Due to its spark-resistant and non-magnetic properties, the M4 Copper Plain Washer is suitable for use in instrumentation, avionics, and defense-grade enclosures where safety and compliance with aerospace material standards are crucial.

5. Renewable Energy Systems

Solar panel mounts, wind turbine enclosures, and energy storage units require conductive and corrosion-proof washers like the M4 Copper Plain Washer to maintain stable electrical connections over long durations.

6. Medical Devices and Laboratory Equipment

In compact mechanical subassemblies used in diagnostics, surgical tools, and lab instruments, the M4 Copper Plain Washer ensures minimal surface stress and offers reliable electrical performance.

7. Instrumentation and Control Panels

In industrial machinery and electrical control systems, these washers are used under fasteners to secure modules and relays, providing additional grounding pathways and reducing thermal stress on components.

8. General Industrial Fastening

Wherever M4 screws are used — whether in assembly lines, enclosures, power units, or panel mounts — the M4 Copper Plain Washer ensures a secure and lasting fastening.

Our M4 Copper Plain Washers are tailored to meet the functional demands of both high-volume manufacturers and precision assembly technicians. As one of the leading copper washer manufacturers in India, Nafees Metal Industries supplies washers to OEMs, contractors, and exporters across sectors.

Advantages of Using M4 Copper Washers

Choosing the right washer material can significantly influence the performance, longevity, and safety of your assemblies. The M4 Copper Plain Washer from Nafees Metal Industries offers a range of practical and performance-driven advantages that make it the go-to solution across industries.

1. Superior Corrosion Resistance

Copper naturally resists rust and oxidation, especially in moist or chemically active environments. This makes the M4 Copper Plain Washer ideal for plumbing, marine, and HVAC applications where exposure to water or gases is frequent.

2. High Thermal & Electrical Conductivity

Copper’s ability to conduct heat and electricity efficiently makes it perfect for electrical grounding, thermal shielding, and heat sink assemblies. The M4 Copper Plain Washer plays a vital role in improving circuit performance and reducing overheating risks.

3. Excellent Load Distribution

These washers effectively distribute clamping pressure over a larger surface area, preventing damage to softer or sensitive substrates. This is especially critical in PCB, automotive sensor, and panel mounting applications.

4. Vibration Damping

Thanks to copper’s slight elasticity, the M4 Copper Plain Washer can absorb shock and vibrations during operation, reducing bolt loosening and increasing assembly stability.

5. Long-Term Durability

Even in extreme environments, copper does not crack, break, or corrode easily. The M4 Copper Plain Washer retains its structural integrity even under fluctuating temperatures or mechanical stress.

6. Safe for Critical Applications

Copper is non-magnetic and does not spark, making these washers safe for explosive, electrical, and aviation environments where safety and compliance are critical.

7. Reusable in Certain Applications

In non-permanent assemblies, M4 Copper Plain Washers can often be reused without performance loss, making them a cost-effective option over time.

8. Environmentally Friendly

Copper is 100% recyclable without quality degradation. By using M4 Copper Plain Washers, you support sustainability in manufacturing and engineering.

9. Customizable for Diverse Needs

We offer washers in various thicknesses, tempers (annealed or hard), and finishes. Whether you need a M4 copper washer seal for fluid-tight applications or a high-conductivity washer for electrical grounding, we deliver tailored solutions.

10. Compliant with International Standards

Our M4 Copper Plain Washers comply with IS 2016, DIN 125, and ISO 7089 standards. This ensures compatibility with global fastener systems and ease of integration across OEM supply chains.

Nafees Metal Industries combines technical expertise with manufacturing excellence to produce washers that deliver real-world benefits in performance and durability. That’s why we are recognized as one of the most reliable copper washer manufacturers and exporters in India.

Applications of M14 Copper Plain Washers

M14 Copper Plain Washers are highly valued in a wide range of industries due to their combination of electrical conductivity, corrosion resistance, and mechanical performance. Their versatility and reliability make them a preferred choice in the following applications:

1. Electrical & Electronics

Copper is one of the best conductors of electricity, making M14 copper washers ideal for electrical contacts, terminals, and grounding assemblies. These washers are used in switchboards, circuit breakers, transformers, and electronic housings to ensure secure fastening and proper conduction without interference or overheating.

2. Automotive & Engine Components

In automotive and heavy vehicle industries, M14 copper plain washers are commonly used in engine assemblies, battery terminals, fuel systems, and braking systems. Their resistance to high temperatures and vibrations allows them to maintain stable performance under extreme conditions.

3. HVAC & Plumbing

Copper’s anti-corrosive properties make these washers excellent for HVAC systems, refrigeration units, and fluid pipelines. They help seal joints and fittings to prevent leakage and wear in temperature-sensitive environments.

4. Aerospace & Defense

Due to their lightweight nature and heat resistance, M14 copper washers are used in precision aircraft components, turbine engines, and military-grade hardware where strength, stability, and thermal tolerance are critical.

5. Marine & Offshore Equipment

Copper resists degradation from saltwater and moisture, making these washers suitable for shipbuilding, underwater machinery, and offshore oil rigs. They maintain their shape and function even in harsh, corrosive conditions.

6. General Manufacturing & Industrial Machinery

In various industrial setups, from manufacturing lines to robotics, M14 copper plain washers are used to evenly distribute load, protect surfaces, and reduce vibration. Their non-magnetic property is also beneficial in sensitive environments where magnetism must be minimized.

7. Renewable Energy Systems

As the renewable energy sector grows, copper washers are increasingly used in wind turbines, solar panel mounting systems, and energy storage devices due to their excellent thermal and electrical performance.

Available Sizes and Specifications of M14 Copper Plain Washers

At Nafees Metal Industries, we understand the importance of precise specifications when it comes to industrial components. Our M14 Copper Plain Washers are manufactured to exacting standards to ensure maximum compatibility, performance, and durability across varied applications.

1. Inner Diameter (ID)

The inner diameter of the washer is precisely machined to 14 mm, allowing a snug fit around M14 bolts, screws, or threaded rods. This ensures reliable load distribution and consistent performance in both static and dynamic applications.

2. Outer Diameter (OD)

We offer M14 washers in multiple outer diameter options to suit specific load-bearing requirements. Common OD ranges include:

• 28 mm (standard)

• 30 mm (heavy-duty)

• 32 mm (custom)

This variation helps meet the diverse strength and spacing needs of different industrial applications.

3. Thickness

We provide multiple thickness options depending on usage:

• 1.0 mm (for lightweight applications)

• 1.5 mm (standard usage)

• 2.0 mm and above (for high-load and vibration-prone environments)

All washers are manufactured with uniform thickness tolerance to maintain structural integrity and fitment precision.

4. Material Grade

We use high-purity Electrolytic Tough Pitch (ETP) Copper or Commercial Grade Copper (C101/C110) based on client specifications. This ensures excellent conductivity, corrosion resistance, and thermal stability.

5. Manufacturing Standards

Our M14 Copper Plain Washers conform to international standards such as:

• DIN 125 / DIN 9021

• IS 2016

• ISO 7089 / ISO 7090

These standards guarantee proper dimensional tolerances, hardness, and performance in critical applications.

6. Customization Options

We provide customized washers based on:

• Outer diameter

• Thickness

• Surface finish (degreased, polished, or tinned)

• Hardness requirements

This allows our clients to specify washers tailored to their exact project requirements, whether for general-purpose use or highly specialized environments.

7. Packaging & Quantity

Our washers are packed in:

• Small boxes (100 to 500 pieces)

• Bulk packaging (10 kg to 25 kg cartons)

• Palletized loads for export shipments

Each pack is labeled with full traceability, including batch number, size, material grade, and manufacturing date.

Why Choose Nafees Metal Industries for M14 Copper Plain Washers?

At Nafees Metal Industries, we bring decades of expertise, advanced manufacturing capabilities, and a deep commitment to quality. Our M14 Copper Plain Washers are trusted across industries for their precision engineering, material purity, and consistent performance. Here’s why we are the preferred supplier for copper washers in India and abroad:

1. Uncompromised Material Quality

We use high-purity electrolytic copper (ETP Grade) and commercial-grade copper (C101/C110) for every washer we produce. This ensures excellent electrical conductivity, corrosion resistance, and thermal stability, making our washers ideal for sensitive electrical and thermal applications.

2. Precision Manufacturing

Our washers are produced using high-tonnage power press machines and advanced die-cutting techniques. Each washer is manufactured with tight dimensional tolerances for a perfect fit on M14 fasteners. The result is zero burrs, uniform thickness, and perfectly centered holes that meet or exceed industry standards.

3. Wide Customization Capabilities

We understand that industrial needs vary. That’s why we offer:

• Custom outer diameters

• Variable thickness options

• Surface treatments (degreased, bright polished, or tinned)

• Bulk or small-packaging options

We cater to both small OEM requirements and large-scale industrial demands.

4. Competitive Pricing

As a direct manufacturer, we eliminate middlemen, offering factory-direct pricing without compromising quality. Whether you need a few hundred washers or bulk quantities, our rates remain competitive and transparent.

5. Pan-India & Export Supply Network

We supply to industries across India and have also built a reputation in GCC countries, Southeast Asia, and Europe. With efficient logistics and on-time delivery, we ensure you receive your washers promptly and securely packed.

6. Stringent Quality Control

Every batch undergoes a multi-level quality check process:

• Dimensional accuracy test

• Surface finish inspection

• Hardness and material composition verification

• Visual checks for flatness and burrs

This rigorous QC process ensures every washer meets our high internal standards before reaching your hands.

7. Responsive Customer Support

Our team is dedicated to offering pre-sales consultation, technical support, and post-sale service. We assist in product selection, customization, and documentation (like test certificates, RoHS compliance, etc.), ensuring a smooth procurement experience.

8. ISO-Certified Operations

Nafees Metal Industries is an ISO 9001:2015 certified company, which reflects our commitment to consistent quality, operational efficiency, and customer satisfaction. You can rely on us for washers that are manufactured under strict process control.

Frequently Asked Questions (FAQs) About M4 Copper Plain Washers

1. What is an M4 Copper Plain Washer used for?
   An M4 Copper Plain Washer is primarily used to evenly distribute the load of an M4 bolt or screw. It is ideal for applications requiring excellent electrical conductivity, thermal resistance, and corrosion protection.

2. What does M4 signify in M4 Copper Plain Washer?
   M4 indicates the washer is designed for use with M4-sized fasteners, which have a 4 mm nominal diameter.

3. Are copper plain washers corrosion-resistant?
   Yes, copper is naturally resistant to corrosion, making these washers suitable for use in humid, marine, and high-temperature environments.

4. Can I use M4 copper washers in plumbing applications?
   Absolutely. Copper washers provide excellent sealing capabilities, making them ideal for plumbing systems where leak-proof connections are essential.

5. Do copper washers provide electrical conductivity?
   Yes, copper has high electrical conductivity, which makes these washers perfect for use in electronic and grounding applications.

6. What is the temperature resistance of M4 copper washers?
   Copper washers can generally withstand temperatures up to 400°C or more, depending on the exact application and environment.

7. Can M4 copper washers be reused?
   While copper washers can be reused in some cases, it’s best to replace them in critical sealing or load-bearing applications to maintain performance.

8. How are M4 copper plain washers manufactured?
   At Nafees Metal Industries, we use high-precision stamping and punching techniques with quality copper sheets, followed by rigorous quality checks to ensure dimensional accuracy and performance.

9. Are your copper washers suitable for international export?
   Yes, our washers meet global quality standards and are exported to several countries across the Middle East, Southeast Asia, and Europe.

10. What is the standard thickness of an M4 copper washer?
    The standard thickness may vary based on the requirement, but typically ranges from 0.5 mm to 1 mm. We also offer customized thicknesses on bulk orders.

11. Do you offer bulk pricing or discounts?
    Yes, we provide competitive pricing and discounts for bulk and repeat orders. Please contact our sales team for a custom quotation.

12. Is there a minimum order quantity (MOQ)?
    For M4 copper plain washers, we generally accept small to medium-size MOQs to support startups and large-scale industries alike.

13. Can I request a sample before placing a bulk order?
    Yes, we provide samples on request. Shipping charges may apply depending on your location.

14. What is your delivery time for M4 copper washers?
    Our standard dispatch time is 2–5 business days for in-stock items. Custom orders may require 7–10 working days.

15. Why should I choose Nafees Metal Industries for copper washers?
    We combine technical precision, quality materials, and reliable customer service. Our washers are trusted by professionals across industries for consistent performance and durability.