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Copper C11000 (ETP) Washers Manufacturer & Exporter in India

Explore Copper C11000 (ETP) Washers Manufacturer & Exporter in India manufactured for demanding industrial applications with reliable strength, corrosion resistance and compliance with international standards.
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-100

Min Temp

260

Max Temp

🌡

260

Suitable for continuous service up to approximately 260°C under typical operating conditions.

⚡

220

Typical tensile strength around 220 MPa depending on product form and heat treatment.

🛡

Good

Good corrosion resistance in a wide range of industrial environments.

⚖

8.96

Typical density is approximately 8.96 g/cm³.

Product Overview

What are Copper C11000 (ETP) Washers?

Copper C11000 (Electrolytic Tough Pitch, ETP) washers are precision flat or shaped fastener components manufactured from high-conductivity copper conforming to ASTM B152 and UNS C11000. With a minimum copper content of 99.90%, these washers offer exceptional electrical and thermal conductivity, making them the industry standard for electrical, electronic, and power transmission applications.

C11000 copper washers are non-magnetic, ductile, and corrosion-resistant, ensuring reliable sealing, spacing, and load distribution in bolted assemblies. They are widely specified for busbar joints, transformer terminals, switchgear, and earthing systems where low contact resistance and long-term durability are critical.

Quick Specifications

MaterialCopper C11000 (ETP)
UNS NumberC11000
DIN Number2.0060
Material StandardASTM B152
Washer Standard (Metric)DIN 125 / DIN 9021 / ISO 7089
Washer Standard (Inch)ASME B18.22.1
TypeFlat, Spring, Belleville, Sealing
Size RangeM3-M64 / 1/8"-2.5"
Hardness45-85 HV (annealed to half-hard)
Electrical Conductivity= 101% IACS
Thermal Conductivity390 W/m·K
? All washers supplied with full traceability and laboratory-verified composition. Custom sizes available on request.

Complete the Fastener Set

Other Copper C11000 (ETP) Fastener Products Available from RealBolt

RealBolt also manufactures the complete Copper C11000 (ETP) fastener range from certified copper alloy bar stock, including Copper C11000 (ETP) Bolts, Copper C11000 (ETP) Nuts, Copper C11000 (ETP) Screws, Copper C11000 (ETP) Studs, and Copper C11000 (ETP) Threaded Rods. All Copper C11000 (ETP) fastener types are produced to ASTM with full EN 10204 MTC 3.1/3.2 documentation.
Copper C11000 (ETP) Bolts
Copper C11000 (ETP) Nuts
Copper C11000 (ETP) Screws
Copper C11000 (ETP) Studs
Copper C11000 (ETP) Threaded Rods

Technical Data

Copper C11000 (ETP) Washers Dimensions, Sizes & Thread Standards

Copper C11000 (ETP) Washers are available in metric M6–M100 and inch ¼″–4″ as standard. Per DIN 125 (flat), DIN 9021 (large OD), ISO 7089, and ASME B18.22.1. Custom OD/ID and thicknesses available. Metric and inch sizes supplied. All Copper C11000 (ETP) washers dimensions are verified against applicable DIN, ISO, and

Flat Washer Dimensions - Metric (DIN 125 / ISO 7089)

Size (M)Inner Ø (mm)Outer Ø (mm)Thickness (mm)
M33.270.5
M66.4121.6
M88.4161.6
M1010.5202.0
M1213.0242.5
M1617.0303.0
M2021.0373.0
M2425.0444.0
M3031.0564.0
M3637.0665.0
M4243.0786.0
M4849.0926.0
M5657.01058.0
M6465.01158.0

Dimensional & Material Standards

StandardCoversType
DIN 125Flat washersMetric
DIN 9021Large OD washersMetric
ISO 7089Plain washersMetric
ASME B18.22.1Plain & lock washersInch
BS 4320Metric plain washersMetric
Material StandardRequirement
ASTM B152Plate/sheet - C11000
ASTM B187Rod/bar - C11000
EN 1652Copper sheet/strip
EN 13601Copper rod/bar
EN 10204 3.1Mill test certificate

Material Chemistry

Copper C11000 (ETP) Chemical Composition

Copper C11000 (ETP) Washers are produced from either tin-stabilized Naval Brass C46400 or aluminium-nickel-iron Aluminium Bronze C63000, with elemental limits per ASTM and MIL-B-24059. Tin (0.5–1%) in Naval Brass prevents dezincification in seawater; aluminium and nickel additions in Al Bronze C63000 provide non-sparking ATEX Zone 1 compliance.

Chemical Composition per ASTM B152

ElementComposition (%)
Copper (Cu)99.90% min
Silver (Ag)0.002% min
Oxygen (O)0.04% max
Other Elements0.05% max (total)
? All heats verified by NABL-accredited spectrometry. Full composition on MTC.

Why Copper C11000 (ETP) Alloy Composition Matters for Washers

99.90% Copper — Maximum Conductivity
The high copper content ensures electrical conductivity = 101% IACS, making C11000 washers ideal for busbar joints, terminals, and grounding where minimal voltage drop is critical.
Low Oxygen Content — Weldability & Ductility
Oxygen content below 0.04% prevents embrittlement and allows for reliable soldering, brazing, and welding of washers to copper conductors or assemblies.
Trace Silver — Enhanced Corrosion Resistance
The trace silver content improves resistance to tarnishing and atmospheric corrosion, ensuring long service life in electrical and outdoor environments.

Fastener Performance

Copper C11000 (ETP) Washers Mechanical Properties & Torque & Proof Load Reference

The table below lists mechanical properties and proof load reference for Copper C11000 (ETP) Washers per ASTM. Copper C11000 (ETP) washers achieve 220 MPa tensile strength, with hardness, yield, and elongation values verified by NABL-accredited testing and reported in the EN 10204 MTC.

Washer SizeRecommended Torque (Nm)Max Clamp Load (kN)
M685.5
M82010.5
M104017.0
M127024.0
M1617044.0
M2034068.0
M2458098.0
?? Note: Copper washers are soft and designed for sealing and conductivity, not for high preload. Do not exceed recommended clamp loads.

Industry Applications

Copper C11000 (ETP) Washers Applications — Industries & End Uses

Copper C11000 (ETP) Washers from RealBolt are specified across marine hardware, ATEX hazardous areas, and naval defence where good corrosion resistance and 220 MPa tensile strength are required for reliable fastener performance. Click each industry below for detailed application examples.
Copper C11000 (ETP) washers are the preferred choice for busbar joints, transformer terminals, switchgear assemblies, and cable lugs. Their high conductivity ensures minimal voltage drop and reliable current transfer in critical power connections.
Flat and spring washers for PCB mounting, terminal blocks, and electronic enclosures. C11000 copper provides excellent solderability and ensures low-resistance, corrosion-free connections for sensitive circuits.
Used in battery terminals, starter motor assemblies, and rail electrification hardware, these washers provide secure, conductive joints that withstand vibration and thermal cycling.
Copper washers are specified for earthing lugs, lightning protection, and HVAC equipment connections, ensuring safe dissipation of fault currents and long-term corrosion resistance.

Copper C11000 (ETP) Washers Standards & International Certifications

Copper C11000 (ETP) Washers from RealBolt Engineering Industries are manufactured to internationally recognised fastener dimensional standards covering thread form, tolerances, strength grades, and quality requirements. Every batch ships with EN 10204 MTC 3.1/3.2, Lloyds Register or DNV certification, MIL specification documentation, and PMI (XRF) reports — available on request for all orders.
Standards
DIN 125A DIN 126 DIN 127 ISO 7089 ISO 7090 ASME B18.21.1 BS 4320 IS 5372 IS 1367
Certifications
ISO 9001:2015RoHS CompliantNABL LabPED 2014/68/EUMTC 3.1 / 3.2

Buy Copper C11000 (ETP) Washers from India's Leading Manufacturer — Get a Competitive Quote Today

Partner with RealBolt — India’s leading manufacturer of certified Copper C11000 (ETP) Washers — for competitive pricing, EN 10204 MTC 3.1/3.2 documentation, and fast Mumbai dispatch. Standard sizes are ex-stock; custom dimensions accepted with 2–3 week lead time. Request your quote today.
022-6743-7972
+91 90226 36025
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Answers for Buyers

Copper C11000 (ETP) Washers — Frequently Asked Questions

Browse expert answers to common questions about Copper C11000 (ETP) Washers from RealBolt — covering alloy selection, ATEX Zone 1 compliance, dezincification resistance, ASTM standard, sizes, and EN 10204 documentation. Contact our technical team directly for project-specific guidance on Copper C11000 (ETP) washers selection and pricing.
Copper C11000 (ETP) washers are available to DIN 125 (flat), DIN 9021 (large OD), ISO 7089, ASME B18.22.1 (inch), and BS 4320 (metric). Custom shapes such as spring, Belleville, and sealing washers can be manufactured to drawing or sample with short lead times.
Yes – C11000 washers are the industry standard for earthing and grounding applications due to their =101% IACS conductivity and corrosion resistance. They ensure low-resistance, reliable connections in power distribution, lightning protection, and telecom grounding systems.
Copper C11000 washers can be used continuously up to 200°C without loss of conductivity or mechanical integrity. For higher temperatures, consult our engineering team for suitable copper alloys or alternative materials.
No MOQ for standard sizes (M6-M24) held ex-stock – we supply from single pieces for urgent requirements. Custom sizes or shapes have a 5 kg minimum. Bulk price breaks at 100 pcs, 500 pcs, and 1000 pcs.

Industrial Cities We Serve:

  • Ahmedabad
  • Aurangabad
  • Bengaluru
  • Chennai
  • Coimbatore
  • Faridabad
  • Gandhidham
  • Greater Noida
  • Gurugram
  • Hazira
  • Hosur
  • Hyderabad
  • Jamnagar
  • Jamshedpur
  • Ludhiana
  • Mumbai
  • Mundra
  • Mysuru
  • Nagpur
  • Nashik
  • Navi Mumbai
  • Noida
  • Pune
  • Rajkot
  • Sanand
  • Surat
  • Thane
  • Tiruppur
  • Vadodara
  • Visakhapatnam

Countries We Export To:

  • US
  • Canada
  • Mexico
  • Germany
  • UK
  • France
  • Italy
  • Spain
  • Netherlands
  • Belgium
  • Poland
  • Sweden
  • Norway
  • Denmark
  • Turkey
  • UAE
  • Saudi Arabia
  • Qatar
  • Oman
  • Kuwait
  • Bahrain
  • South Africa
  • Egypt
  • Nigeria
  • Australia
  • New Zealand
  • Singapore
  • Malaysia
  • Indonesia
  • Thailand
  • Vietnam
  • South Korea
  • Japan
  • Brazil