Brass Parts India is a major manufacturer and exporter of Copper Washers and Pressed Copper Washers from Jamnagar, India — supplying fastener distributors, plumbing and hydraulic product companies, OEM manufacturers, and industrial hardware companies across the USA and worldwide. Our copper washers are precision-stamped from certified C11000 electrolytic copper and C12200 DHP copper sheet and strip, delivering consistent dimensions, excellent sealing performance, and reliable corrosion resistance across all applications.
We manufacture flat washers, sealing washers, spring washers, tab washers, repair washers, and custom pressed copper washer profiles — in any size from M4 (3/16″) to M64 (2-1/2″) and in thicknesses from 0.3 mm to 6 mm. Export pricing: USD 0.02 – USD 1.80 per piece CIF US seaport.
Why Copper Washers?
Copper washers offer a unique combination of properties that no other washer material can match: outstanding malleability for reliable metal-to-metal sealing, excellent corrosion resistance in water and most chemicals, high thermal and electrical conductivity, and a soft texture that conforms to surface irregularities without damaging mating threads or port faces. They are the preferred choice for sealing hydraulic and pneumatic port plugs, engine drain plugs, banjo bolt fittings, copper pipe joints, and electrical connections where both sealing and conductivity are required.
Types of Copper Washers We Manufacture
Copper Flat Washers (Plain Washers)
Standard flat washers in copper per DIN 125, ISO 887, ASME B18.22.1, and equivalent standards. Available in metric (M4 to M64) and imperial (3/16″ to 2-1/2″) bolt sizes. Stamped from C11000 ETP copper sheet in thicknesses 0.5 mm to 3 mm. Used under bolt heads and nuts for load distribution, galvanic separation between dissimilar metals, and electrical grounding continuity.
Copper Sealing Washers (Crush Washers / Bonded Washers)
Soft-annealed copper sealing washers for hydraulic and pneumatic port sealing. The washer deforms plastically under bolt tightening to fill surface irregularities and create a metal-to-metal seal. Available for metric thread sizes M8 to M42 and corresponding SAE and BSP port fitting sizes. Standard in engine oil drain plugs, hydraulic system port plugs, brake caliper banjo bolts, and fuel system fittings. Widely distributed by US auto parts retailers, hydraulic distributors, and industrial MRO suppliers.
Copper Banjo Bolt Washers
Precision-stamped thin copper washers for banjo bolt assemblies in brake lines, fuel systems, and hydraulic circuits. Always sold in pairs (one washer each side of banjo fitting). Standard sizes: M8 (14 mm OD), M10 (17 mm OD), M12 (20 mm OD), M14 (22 mm OD). OEM-specification dimensions for Metric, SAE, and JIS banjo fittings. Re-usable after annealing; single-use as supplied for critical brake and fuel systems.
Copper Repair Washers (Oversized OD)
Large-OD copper washers used to bridge enlarged or damaged holes, acting as backing plates for repairs. Particularly useful for corroded or stripped drain plug holes in aluminum oil sumps and hydraulic housings. Available in large OD × small ID combinations for maximum coverage.
Copper DIN 7603 Sealing Washers
Precision copper sealing washers to DIN 7603 Form A (flat) and Form B (with inner sealing lip). Available in sizes M6 to M48 per the DIN standard. The most widely exported copper sealing washer standard globally. Supplied in soft-annealed temper for reliable sealing without over-tightening.
Copper Spring Washers (Belleville / Disc Spring)
Pressed copper Belleville disc springs and conical washers for applications requiring spring-loaded axial force with electrical and thermal conductivity. Used in battery cell compression fixtures, power relay contacts, and high-temperature electrical connections where steel spring washers would corrode or lose temper.
Copper Tab Washers and Lock Washers
Pressed copper tab washers with internal and external tabs for locking bolts and nuts against rotation in vibration-prone assemblies. External tab bent against bolt head flat; internal tab bent into shaft keyway. Used in automotive driveline components, electrical motor terminal bolts, and industrial machinery.
Thick Copper Washers and Copper Spacers
Thick-section copper washers (3–10 mm) machined or stamped from copper bar for use as spacers, thermal standoffs, and high-current bus bar connection washers. For thicknesses above 6 mm, CNC-turned copper washers from bar stock are available.
Custom Pressed Copper Washers to Drawing
Any OD × ID × thickness combination in copper. Non-standard hole sizes, shaped apertures (square, hexagonal, D-shaped), partial washers, and complex profiled washers produced from your drawings. Tooling development in 2–3 weeks; production lead time 3–5 weeks after tooling approval.
Material Grades and International Equivalents
| Grade | Standard | Country | Cu % | Key Properties | Best Washer Application |
|---|---|---|---|---|---|
| C11000 (ETP Copper) | ASTM B152 | USA | ≥99.9% | 100% IACS; excellent ductility | Flat washers, sealing washers, electrical |
| C12200 (DHP Copper) | ASTM B152 | USA | ≥99.9% | Phosphorus deoxidized; weldable | Plumbing sealing washers, solar systems |
| C10200 (OF Copper) | ASTM B152 | USA | ≥99.95% | Oxygen-free; highest conductivity | Precision electrical and EV washers |
| CW004A (Cu-ETP) | EN 13601 | Europe | ≥99.9% | EN DIN standard | DIN 125, DIN 7603 washers |
| CW024A (Cu-DHP) | EN 1057 | Europe | ≥99.9% | Phosphorus-deoxidized | European plumbing sealing washers |
| C1100 | JIS H3100 | Japan | ≥99.9% | JIS equivalent to C11000 | JIS automotive and industrial washers |
| C26000 (Cartridge Brass) | ASTM B36 | USA | 70% Cu, 30% Zn | Higher strength; moderate conductivity | Structural brass washers, load-bearing |
Manufacturing and Dimensional Standards
- DIN 125: Plain washers — metric, normal series
- DIN 7603: Copper sealing washers (Form A flat, Form B lipped)
- ASME B18.22.1: Plain washers — inch series (USA)
- ISO 887: Plain washers — general engineering
- BS 4320: Metric plain washers (UK)
- SAE J1804: Sealing washers for hydraulic fittings (USA)
Applications
- Engine oil drain plugs, transmission drain plugs
- Hydraulic system port plugs and banjo bolt fittings
- Brake caliper and master cylinder banjo fittings
- Copper pipe joint flanges and union connections
- Electrical cable lug bolted connections (grounding)
- Fuel system fittings in diesel and gasoline engines
- Solar panel mounting and grounding rail connections
- Compression fittings backup rings
- CNC machine slide adjustment washers
- Electrical switchgear bus bar connections
Why Choose Brass Parts India for Copper Washers?
- Pure ETP Copper: All washers from certified C11000/CW004A strip — not plated steel or contaminated scrap copper.
- Soft-Annealed as Standard: O60 temper for maximum sealing effectiveness in crush-washer applications.
- DIN and ASME Standards: We manufacture to DIN 125, DIN 7603, ASME B18.22.1, and ISO 887 dimensions.
- Complete Size Range: M4 to M64 metric; 3/16″ to 2-1/2″ imperial; custom sizes.
- Competitive Export Pricing: USD 0.02–USD 1.80/piece CIF US ports.
- High-Volume Capability: Progressive dies for millions of pieces per month.
- ISO 9001 Quality: 100% dimensional check on OD, ID, and thickness; AQL on bulk orders.
Frequently Asked Questions – Copper Washers
Q1: Can copper sealing washers be reused?
A: Once a copper crush washer has been deformed in service, it should generally be replaced for critical sealing applications (brake systems, high-pressure hydraulics). However, copper washers can be re-annealed (heated to ~400°C and quenched in water) to restore their soft, malleable condition, allowing reuse. For automotive oil drain plugs and low-pressure applications, annealed copper washers are commonly reused by professional mechanics.
Q2: What is the difference between DIN 7603 Form A and Form B?
A: DIN 7603 Form A is a simple flat copper sealing washer — the most common type for general use on port plugs and drain plugs. Form B has an additional inner sealing lip that provides a labyrinth seal effect for higher-pressure applications and ensures the washer centers correctly on the bolt/plug shank. Form B is preferred for hydraulic systems operating above 100 bar.
Q3: What is your MOQ for copper washers?
A: Standard DIN 125 and DIN 7603 sizes: 5,000 pieces per size. Banjo bolt washers (M8, M10, M12): 5,000 pairs. Custom/non-standard: 2,000 pieces minimum. Mixed-size assortment packs (e.g., 1,000-piece assortment box) available for distributor customers.
Q4: Can you supply copper washers in DIN 7603 certified to DIN?
A: Yes. We supply DIN 7603 Form A and B washers to the dimensional specification of the standard. Full material certificates (C11000/CW004A), dimensional inspection reports, and certificate of conformance are provided. Third-party inspection by SGS or Bureau Veritas available on request for larger orders.
Request a Quote
Contact Brass Parts India for copper washers and pressed copper washers. Email sales@brass-parts-india.com or call +91 22 4344 9300. Competitive CIF pricing to all US seaports. 24-hour response.
