When sealing matters – whether in plumbing, hydraulic, or automotive systems – solid copper washers provide a dependable, leak-proof solution. As a trusted copper washers supplier, Stephens Gaskets has supplied engineers and technicians across the UK with sealing washers that deliver performance, longevity, and value.
This blog explores why copper is such an effective sealing material, where it’s used, and how to choose the right washer for your application. Whether you’re looking to buy copper washers for immediate use or planning a larger project, we’ll guide you through everything you need to know.
Why Copper Is Ideal for Sealing Applications
Copper is soft, malleable, and corrosion-resistant – making it perfect for sealing under compression. When installed correctly, a solid copper washer forms a tight, uniform seal between two surfaces. This makes it ideal for systems carrying liquids or gases under pressure.
Copper conforms easily to imperfections in mating surfaces. It fills microscopic gaps to prevent leaks without the need for additional sealant or complex installation techniques.
Key Benefits of Solid Copper Washers
1. Excellent Sealing Capability
Copper naturally compresses to form a gas-tight or fluid-tight seal, making it the material of choice for many critical applications.
2. Temperature Resistance
Copper washers retain their sealing integrity even at high temperatures – ideal for hot water systems, engines, and hydraulic units.
3. Corrosion Resistance
Used in plumbing, automotive, and marine environments, copper resists corrosion from water, fuel, and hydraulic fluids.
4. Reusability in Low-Stress Settings
In certain non-critical applications, copper washers can be reused if not over-compressed or deformed-offering cost savings without compromising function.
Where Are Copper Washers Used?
As one of the leading copper washers UK suppliers, Stephens Gaskets provides solutions to a wide range of industries:
- Plumbing & heating systems
- Hydraulic and pneumatic assemblies
- Fuel injection and brake systems
- Marine fittings and watercraft
- HVAC and refrigerant systems
They are especially useful as sealing washers for plumbing, where consistent pressure, high temperatures, and corrosion resistance are key.
Standard & Custom Options Available
At Stephens Gaskets, we stock and manufacture copper washers in a wide range of:
- Inner diameters (ID) and outer diameters (OD)
- Thicknesses from 0.5mm to 3mm
- Metric and imperial sizes
- Standard and non-standard profiles
Need a specific size or spec? We also supply bespoke copper washers made to drawing, sample, or CAD file.
See more about our custom copper washers and the washer itself on our dedicated landing page.
Sealing Washers for Plumbing: What to Consider
1. Thread Type & Surface
Copper washers work best with parallel thread connections and clean, flat surfaces. Always check thread type and surface quality before installation.
2. Pressure Rating
While copper washers can handle moderate pressures well, very high-pressure systems may benefit from washers with reinforced edges or double sealing designs.
3. Temperature & Fluid Compatibility
Copper resists a wide range of chemicals and high temperatures, but be sure to confirm compatibility with the fluid or gas in use.
Why Choose Stephens Gaskets as Your Copper Washers Supplier?
We’ve been supplying UK industry with precision washers for over 70 years. Our expertise in manufacturing and materials makes us a trusted copper washers supplier for companies large and small.
What you can expect from us:
- ISO 9001-certified UK manufacturing
- Large stock of standard copper washers
- Fast turnaround on custom jobs
- Technical advice and application support
- Competitive pricing and bulk order options
Whether you need 10 washers or 10,000, we deliver with accuracy, speed, and service.
When to Specify Solid Copper Washers
Choose copper washers when:
- You need a gas-tight or fluid-tight seal
- Your application involves heat, vibration, or corrosive media
- Reliability and safety are non-negotiable
- You’re dealing with metal-to-metal fittings in hydraulic or plumbing systems
And if your project needs something more specialised, we can supply bespoke copper washers built to suit your specifications.
Frequently Asked Questions
1. Are copper washers reusable?
In low-pressure, non-critical settings, they may be reused. However, for optimal sealing, especially in hydraulics, a new washer is recommended with every reassembly.
2. Do copper washers seal better than rubber or fibre?
Yes, especially in high-temperature and high-pressure environments. Copper outperforms non-metallic washers in heat resistance and long-term reliability.
3. How do I know what size to buy?
Measure both your fitting’s inner and outer diameters. If you’re unsure, our team can help select the correct size from our extensive range.
4. Do you deliver copper washers UK-wide?
Yes, Stephens Gaskets offers fast nationwide delivery. Same-day dispatch may be available for stock sizes.
Final Thoughts: Seal It Right with Copper
Solid copper washers are an essential part of many high-performance assemblies. Their ability to seal under pressure, resist corrosion, and handle high temperatures makes them an excellent choice for professionals who demand reliability.
At Stephens Gaskets, we combine decades of experience with modern manufacturing to give you copper washers that work first time – every time.
Whether you need off-the-shelf parts or a full custom copper sealing solution, we’re ready to help.