0.7mm (21 AWG) Copper Bare Wire (99.9% Copper – Cu)


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Bare Wire

The Crazy Wire Company are best know as suppliers of top-quality copper bare wire in many thicknesses. We have enormous stock levels at all times, as we use this wire to weave our woven mesh products.

0.7mm bare copper wire is a type of copper wire that has a diameter of 0.7 millimetres and does not have any insulation or coating on it. This type of wire is commonly used in electrical and grounding applications where conductivity is important. The thinness of the wire allows for flexibility and ease of bending and shaping to fit different configurations. The bare nature of the wire allows for direct electrical contact and can be used in applications such as jewellery making, sculpture, and other crafts.

Key product details:

  • 99.9% Copper with the 0.01% being made up of trace elements.
  • Assay – =99.9%
  • Form – wire
  • Resistivity – 1.673 µO-cm, 20°C
  • Diam. – Various
  • bp – 2567 °C(lit.)
  • mp – 1083.4 °C(lit.)
  • Density – 8.94 g/mL at 25 °C(lit.)

Other Available Copper Options

Why Use The Crazy Wire Company

  1. Quality of products: The Crazy Wire Company always  offer high-quality products that meet industry standards and customer expectations.
  2. Selection: We offer a wide variety of wire products and sizes to meet the diverse needs of our customers. We have more than 600 products available through our site and counting. 
  3. Price: We always offer the best value possible. Our wires are available as part of our major weaving processes, so it is bought at the best possible rate. 
  4. Availability: Our products are kept in house and are ready to ship immediately. 
  5. Customer service: Our experienced staff help our customers feel confident in their purchases and provide assistance when required. 

What Else Is Available?

We do not only offer copper round wire. We also have a huge range of KA1 and stainless steel round wire in stock at all times.

Ribbon wire and flat wire are stocked for immediate dispatch too.


FAQs About Copper Wire

Is It Easy To Bend Copper Wire?

Yes, you can bend 0.7mm copper wire. Copper wire is relatively soft and malleable, so it can be shaped and bent into a variety of forms. However, the thinner the wire, the more delicate the process may be.

Bending 0.7mm copper wire will require some attention, as it is thinner than the usual wire used in jewellery making, and it may require the use of specialized tools and techniques. Using pliers with a small jaw and tips, for example, will allow for more precise bending and shaping of the wire.

It’s important to be gentle and apply an even pressure when bending the wire, to avoid breaking or kinking it. It’s also a good idea to practice on some scrap wire before attempting to bend your final piece.

Another option is to use a bending jig, which is a tool that allows for precise and consistent bending of wire. Jigs can be purchased or made at home, and they are particularly useful when making multiple pieces of jewellery with the same shape or pattern.

It’s worth noting that copper wire can be annealed, which is a process of heating and cooling the wire that makes it more pliable and easier to bend. However, this process can only be done to thicker wires, and 0.7mm is already very thin, so it’s not recommended.

Which Copper Wire Has The Highest Resistance?

The resistance of copper wire is dependent on its diameter, length, and temperature. In general, the thinner the wire or the longer the wire, the higher the resistance will be. Additionally, as the temperature of the wire increases, so does its resistance.

Therefore, a thinner gauge or longer length of copper wire will have a higher resistance than a thicker gauge or shorter length of copper wire. For example, a 30-gauge copper wire will have a higher resistance than a 20-gauge copper wire, and a 100-foot length of copper wire will have a higher resistance than a 10-foot length of copper wire, all other factors being equal.

What Happens To Copper Wire When Bent?

When copper wire is bent, its shape changes due to the deformation of the material. The extent of the deformation depends on the amount of force applied and the type of bend that is made. Copper is a relatively soft and ductile material, which means that it can be easily bent and formed without breaking or cracking, as long as it is not bent too sharply.

However, repeated bending or over-bending of copper wire can cause it to break or crack. Additionally, sharp bends can cause the wire to weaken, which can lead to failure over time. To prevent damage, it is important to use proper techniques and tools when bending copper wire and to avoid bending it beyond its limit of ductility.

Why Does Copper Wire Turn Black?

Copper wire can turn black due to a process called oxidation, which is a chemical reaction that occurs when copper is exposed to air and moisture over time. When copper is exposed to the air, it reacts with oxygen to form copper oxide, which can create a dark or black coating on the surface of the wire.

The black coating that forms on copper wire is usually a thin layer of cupric oxide (CuO) or cuprous oxide (Cu2O), which is a natural and harmless process. However, if the copper wire is exposed to other chemicals or harsh environments, the black coating could be a sign of corrosion, which can weaken the wire and reduce its conductivity. In some cases, the black coating can also be a result of dirt, grease, or other contaminants that have accumulated on the surface of the wire.



Check out our blog ‘what you need to know about: pure copper wire’  for more information on copper wire in general. Our goal for our blogs and help guides is to answer as many questions as possible to help to explain the possibilities of mesh to our customers. 

We also offer similar products through our highly popular eBay store, check us out there too.

Contact our team today if you have any questions at all. We are always really keen to help in any way that we can. 

Additional information


10 Metres (33 Feet), 25 Metres (82.5 Feet), 50 Metres (166.66 Feet)


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