0.9mm (19 AWG) | KA1 Wire FeCrAl A1


0.9mm FeCrAl A1 wire is a type of heating wire made of an iron-chromium-aluminium alloy. The wire has a diameter of 0.9mm, which is relatively thick and is commonly used in applications that require a high heating load or in building larger heating coils.

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KA1 Wire

The Crazy Wire Company are best known and long established as Europe’s preferred suppliers of top quality KA1 wire. We have enormous stock levels at all times as we use this wire to weave our mesh products.

0.9mm FeCrAl A1 wire is a type of heating wire made of an iron-chromium-aluminium alloy. The wire has a diameter of 0.9mm, which is relatively thick and is commonly used in applications that require a high heating load or in building larger heating coils. FeCrAl A1 wire is known for its high electrical resistance, high-temperature resistance, and good oxidation resistance, which make it suitable for use in heating elements, resistors, and other high-temperature applications. The wire is also easy to work with and can be easily shaped and bent into different configurations. FeCrAl A1 wire is commonly used in various heating applications, including electric ovens, toasters, water heaters, and industrial furnaces.

Technical Specification:

  • Diameter – 0.9mm (900 Micron – 19 AWG)
  • Ohms/ft – 2.15
  • 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

How Do I Build A KA1 Cutting Wire?

Building a KA1 cutting wire can be a bit challenging because KA1 is not typically used as a cutting wire due to its high melting point and relatively low tensile strength. However, if you still want to build a KA1 cutting wire, here are the general steps:

1. Determine the length and diameter of the wire you need based on the specific application.
2. Select the KA1 wire with the appropriate gauge and length, taking into account the cutting tension and temperature requirements.
3. Stretch the wire to straighten it and remove any kinks or bends.
4. Attach the wire to a suitable cutting tool, such as a hot wire cutter or foam cutter, and ensure that it is securely held in place.
5. Apply heat to the KA1 wire using a suitable power supply or controller, such as a variable voltage power supply or temperature controller.
6. Monitor the temperature of the wire to ensure that it does not exceed its maximum operating temperature or cause any safety hazards.
7. Use the cutting tool to make the desired cut, and adjust the cutting speed and tension as needed.

Cutting Foam With KA1 Wire

Cutting foam with a KA1 wire is possible, but it requires some special considerations. KA1 is a high-temperature wire that is commonly used as a heating element, and it can be used to cut through foam by applying heat to the wire. However, it’s important to note that foam can release toxic fumes when heated, so appropriate safety precautions should be taken, such as wearing a respirator and working in a well-ventilated area.
To cut foam with a KA1 wire, you can follow these general steps:
1. Choose the right type of foam for the job. Some types of foam are more suitable for cutting with a hot wire than others.
2. Determine the length and shape of the cut you need and set up your cutting apparatus. This could be a simple handheld tool or a more complex table saw or CNC machine.
3. Heat the KA1 wire to the appropriate temperature for the foam you are cutting. This temperature will depend on the type and thickness of the foam and can be determined through experimentation.
4. Move the KA1 wire slowly and steadily through the foam to make the desired cut. Adjust the speed and temperature as needed to achieve the desired result.
5. Allow the foam to cool before handling it.

Why Alloys Are Used In Electrical Heating Devices?

Alloys are commonly used in electrical heating devices and heating elements for several reasons:

  1. Higher resistance: Alloys such as nichrome and KA1 are specifically designed to have a higher electrical resistance than pure metals like copper or Aluminium. This makes them well-suited for heating elements, where resistance is needed to generate heat.
  2. High-temperature capability: Many alloys are designed to withstand high temperatures without melting or degrading. This makes them ideal for use in electric heaters and other high-temperature applications.
  3. Corrosion resistance: Some alloys are formulated to be more resistant to corrosion than pure metals, which can help to extend the lifespan of the heating element and reduce the need for maintenance or replacement.
  4. Ductility and workability: Some alloys are more ductile and easier to work with than pure metals, which can make them easier to shape and form into the desired shape for the heating element.
  5. Cost effectiveness: Alloys can be more cost-effective than pure metals for certain heating applications, due to their specific properties and ability to withstand high temperatures and resist corrosion.

What Is The Coefficient Of Thermal Expansion Of KA1?

The coefficient of thermal expansion (CTE) of KA1, a type of iron-chromium-Aluminium (FeCrAl) alloy, is typically around 10 to 11 μm/m°C. This value can vary slightly depending on the specific composition and manufacturing process of the particular KA1 wire being used.

It’s important to note that the CTE of KA1 can change with temperature and is typically higher at higher temperatures. Additionally, the CTE of KA1 can be affected by other factors such as the direction of the measurement, the state of stress, and the presence of impurities.



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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