0.7mm (21 AWG) | KA1 (FeCrAl A1) Wire


0.7mm FECRAL alloy wire is a wire made of an iron-chromium-aluminum alloy with a diameter of 0.7mm. This type of wire is known for its high electrical resistance and is commonly used in heating elements, resistors, and other applications that require high-temperature resistance.

✔ Huge Range Available

✔ Produced In Warrington, UK

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KA1 FeCrAl Wire

The Crazy Wire Company are best known and long established as Europe’s preferred suppliers of top quality FeCrAl wire. We have enormous stock levels at all times as we use this wire to weave our mesh products.

0.7mm FECRAL alloy wire is a wire made of an iron-chromium-aluminum alloy with a diameter of 0.7mm. This type of wire is known for its high electrical resistance and is commonly used in heating elements, resistors, and other applications that require high-temperature resistance.

Technical Specification:

  • Diameter – 0.7mm (700 Micron – 21 AWG)
  • Ohms/ft – 3.58
  • C = Min – 0% Max – 0.08%
  • Si = Min – 0% Max – 0.7%
  • Mn = Min – 0% Max – 0.4%
  • Cr = Min – 20.5% Max – 23.5%
  • Al = Nominal Comp – 5.8% – Min – 0% – Max – 0%
  • Fe = Balance

Available KA1 Options:

  • 1.15mm (17 AWG) – 1.35 ohms/m
  • 1.02mm (18 AWG) – 1.77 ohms/m
  • 0.9mm (19 AWG) – 2.15 ohms/m
  • 0.8mm (20 AWG) – 2.84 ohms/m
  • 0.7mm (21 AWG) – 3.58 ohms/m
  • 0.6mm (22 AWG) – 4.94 ohms/m
  • 0.65mm (22 AWG) – 4.26 ohms/m
  • 0.64mm (22 AWG)
  • 0.5mm (24 AWG) – 7.11 ohms/m
  • 0.55mm x 0.1mm – 26.05 ohms/m
  • 0.55mm (23 AWG) – 5.96 ohms/m
  • 0.4mm (26 AWG) – 11.46 ohms/m
  • 0.48mm (25 AWG) – 7.79 ohms/m
  • 0.45mm (25 AWG) – 8.93 ohms/m
  • 0.42mm (26 AWG) – 10.6 ohms/m
  • 0.3mm (29 AWG) -19.89 ohms/m
  • 0.38mm (27 AWG) – 12.79 ohms/m
  • 0.37mm (27 AWG) – 13.26 ohms/m
  • 0.35mm (27 AWG) – 14.69 ohms/m
  • 0.34mm (28 AWG) -15.15 ohms/m
  • 0.32mm (28 AWG) -17.46 ohms/m
  • 0.2mm (32 AWG) – 46.11 ohms/m
  • 0.28mm (30 AWG) – 22.75 ohms/m
  • 0.27mm (30 AWG) – 24.86 ohms/m
  • 0.25mm (30 AWG) – 29.29 ohms/m
  • 0.23mm (31 AWG) – 34.36 ohms/m
  • 0.21mm (32 AWG) – 40.44 ohms/m
  • 0.1mm x 0.2mm – 71.83 ohms/m
  • 0.1mm (38 AWG)
  • 0.18mm (33 AWG) – 56.98 ohms/m
  • 0.17mm (34 AWG) – 62.57 ohms/m
  • 0.15mm (34 AWG) – 82.52 ohms/m
  • 0.13mm (36 AWG) – 107.87 Ohms/m
  • 0.12mm (36 AWG)
  • 0.09mm (39 AWG) – 228.40 ohms/m
  • 0.08mm (40 AWG)
  • 0.07mm (41 AWG)
  • 0.06mm (42 AWG) – 496 ohms/m
  • 0.05mm (44 AWG) – 577 ohms/m

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 KA1 round wire. We also have a huge range of stainless steel wire and Ni80 round wire in immediate stock too.

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


FAQs About This Wire

What Principle Is Used To Make An Immersion Heater Work?

An immersion heater works on the principle of Joule heating, also known as Ohmic heating. When an electric current flows through a resistive material, such as a heating element made of a high-resistance alloy, the electrical energy is converted into heat energy. The heating element is immersed in a liquid or gas, and the heat generated by the element is transferred to the surrounding medium by convection. As a result, the temperature of the medium rises, providing the desired heating effect.

What Is An Immersion Heater?

An immersion heater is an electric device that is used to heat liquids or gases by immersing a heating element in the substance being heated. It typically consists of a heating element made of a high-resistance alloy, such as nickel-chromium or iron-chromium-aluminum, that is enclosed in a sheath, often made of stainless steel, to protect it from the surrounding medium. The sheathed heating element is then inserted into a container or tank filled with liquid or gas that needs to be heated, and electrical power is supplied to the heating element, causing it to heat up and transfer heat to the surrounding medium. Immersion heaters are commonly used in a variety of industrial, commercial, and residential applications, such as in water heaters, boilers, and process tanks.

Why Alloys Are Used In Electrical Heating Devices?

Alloys are used in electrical heating devices because they have high electrical resistance, which allows them to convert electrical energy into heat energy efficiently. When an electric current is passed through a resistive material, such as an alloy wire, the electrical energy is converted into heat energy through the process of Joule heating. Alloys are also preferred because they have good mechanical properties, are corrosion-resistant, and can withstand high temperatures without degrading, making them suitable for use in high-temperature environments such as heating elements. Different alloys can also be tailored to have different resistances, allowing heating devices to be designed with specific heating characteristics to meet different application requirements. Some common alloys used in electrical heating devices include nickel-chromium (NiCr), iron-chromium-aluminium (FeCrAl), and copper-nickel (CuNi) alloys.

What Is The Heating Element Used In Electric Geyser?

The heating element used in an electric geyser is typically a high-resistance alloy wire that is coiled to form a heating element. The most commonly used heating element in electric geysers is an alloy made of nickel-chromium (NiCr) or iron-chromium-aluminium (FeCrAl), which has a high melting point and can withstand the high temperatures required for water heating. The heating element is enclosed in a metal sheath, such as copper or stainless steel, and is installed at the bottom of the geyser tank, where it is immersed in water. When electrical power is supplied to the heating element, it heats up and transfers heat to the surrounding water by conduction and convection, raising the temperature of the water to the desired level. The heating element is controlled by a thermostat, which switches off the power supply when the water reaches the desired temperature and switches it on again when the temperature drops below the set point.



The Crazy Wire Company is a leading UK based supplier of nichrome, FeCrAl, and stainless steel wires. We specialise in rapid delivery to any location around the country. Our factory is located in Warrington, which is the historic home of the UK’s wire industry.

Check out our blog ‘everything that you need to know about wires’   for more information on resistance 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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