A4 stainless key steel

Bright key steel, DIN 6880 - A4 stainless steel bar

A4 stainless key steel
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Key steel plays an essential role in many different mechanical and industrial applications, allowing for power transmission, as well as keeping parts in place. A4 stainless steel key bars made to DIN 6880 are particularly known for their high precision and sturdiness.

What is key steel?

Key steel is used to make keys - mechanical components which are in turn inserted into specially designated grooves in two mechanical components to lock them together, thus allowing for effective torque transmission and preventing relative movement between the parts.

DIN 6880 standard

The German industry standard DIN 6880 lays out the necessary dimensions, tolerances and materials for key steel. This standard ensures that key bars are compatible and interchangeable, making for efficient installation and operation in mechanical systems.

Properties of A4 stainless steel

A4 stainless steel is an ideal combination of corrosion resistance, mechanical strength and acid resistance, making it a material of choice for rods of key steel. Unlike A2 stainless steel, A4 stainless steel is resistant to chlorine-rich and saline media, making it suitable for more corrosive environments.

Comparison between A2 stainless steel & A4 stainless steel

The main difference between A2 stainless steel and A4 stainless steel is their chemical make-up and corrosion resistance. A4 stainless steel contains more chromium, nickel and sometimes molybdenum than A2 stainless steel, meaning it offers better resistance to chemical attacks, especially in tough marine or industrial settings.

Applications for A4 stainless steel rods for keys

Power transmission

A4 stainless steel key bars are widely used in power transmission systems to fasten shafts to hubs, gears and pulleys, allowing for torque to be transmitted effectively.

Industrial machinery

Keys made from A4 stainless steel key bars allow for alignment and fixing of rotating components, guaranteeing smooth and safe operation in industrial machines.

Automotive and aeronautics

A4 stainless key steel is used to make parts that are essential in steering systems, engines and transmissions for motor vehicles and the aeronautical sector, where reliability and safety are paramount.

Advantages of A4 stainless key steel

Precision & compatibility

With its h9 tolerance, A4 stainless bright key steel offers exceptional dimensional accuracy - and is thus perfectly compatible with DIN 6880-standard mechanical components.

Sturdiness & durability

A4 stainless steel is extremely sturdy and durable, capable of withstanding high loads and rough operating conditions, making for long-lasting joints.

Wear resistance

A4 stainless steel bars offer excellent wear resistance, minimising the need for frequent maintenance and replacements, making them a cost-effective and reliable choice for industrial applications.

How do I choose the right key steel?

When choosing a key steel bar, you should take into account:

  • Dimensions: The dimensions must match the grooves of the components.
  • Material: The type of stainless steel should be chosen in accordance with loads and operating conditions.
  • Standards: Make sure the steel complies with relevant industry standards, e.g. DIN 6880.

For applications that require high precision and maximum robustness, these bars of A4 stainless key steel are an excellent choice. Their dimensional tolerance and excellent mechanical properties make them an ideal choice for harsh industrial environments.

Installing keys made from our A4 stainless steel bars

Installation steps

  • Preparation: Make sure the keyway is clean and free of debris.
  • Inserting the key: Insert the A4 stainless steel key bar into the keyway.
  • Assembly: Slide the hub or pulley onto the shaft, aligning the groove (keyway) with the key.


In order to install a key, make sure you have a:

  • Hammer: To insert the key into the keyway.
  • Punch: To align the key correctly in the keyway.
  • Gauge: To check dimensional tolerances.

In summary, A4 stainless key steel to DIN 6880 is essential for various industrial applications. Its high precision, stability and wear resistance makes it a material of choice for the transmission of power and for fastening rotating components.

A4 stainless key steel

Bright key steel, DIN 6880 - A4 stainless steel bar

  • DIN 6880
  • Length: 500, 1000 or 3000mm
  • Dimensions: 2x2mm to 45x25mm
  • A4 stainless steel
  • h9 tolerance

Bars of A4 stainless key steel. We can also offer special dimensions & tolerances, lengths, and different steel grades / heat treatment processes upon request.

Starting from
The 100 pieces
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Technical specifications
Product sheet
*Account required. Minimum order amount €50.
Dimensional chart
Section (Inox 316Ti X6CrNiMoTi17-12-2)Tolérance h9
2x2h9xh9
3x3h9xh9
4x4h9xh9
5x5h9xh9
6x4h9xh11
6x6h9xh9
8x7h9xh11
10x8h9xh11
12x8h9xh11
14x9h9xh11
16x10h9xh11
18x11h9xh11
20x12h9xh11
22x14h9xh11
25x14h9xh11
28x16h9xh11
32x18h9xh11
36x20h9xh11
40x22h9xh11
45x25h9xh11
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Key steel plays an essential role in many different mechanical and industrial applications, allowing for power transmission, as well as keeping parts in place. A4 stainless steel key bars made to DIN 6880 are particularly known for their high precision and sturdiness.

What is key steel?

Key steel is used to make keys - mechanical components which are in turn inserted into specially designated grooves in two mechanical components to lock them together, thus allowing for effective torque transmission and preventing relative movement between the parts.

DIN 6880 standard

The German industry standard DIN 6880 lays out the necessary dimensions, tolerances and materials for key steel. This standard ensures that key bars are compatible and interchangeable, making for efficient installation and operation in mechanical systems.

Properties of A4 stainless steel

A4 stainless steel is an ideal combination of corrosion resistance, mechanical strength and acid resistance, making it a material of choice for rods of key steel. Unlike A2 stainless steel, A4 stainless steel is resistant to chlorine-rich and saline media, making it suitable for more corrosive environments.

Comparison between A2 stainless steel & A4 stainless steel

The main difference between A2 stainless steel and A4 stainless steel is their chemical make-up and corrosion resistance. A4 stainless steel contains more chromium, nickel and sometimes molybdenum than A2 stainless steel, meaning it offers better resistance to chemical attacks, especially in tough marine or industrial settings.

Applications for A4 stainless steel rods for keys

Power transmission

A4 stainless steel key bars are widely used in power transmission systems to fasten shafts to hubs, gears and pulleys, allowing for torque to be transmitted effectively.

Industrial machinery

Keys made from A4 stainless steel key bars allow for alignment and fixing of rotating components, guaranteeing smooth and safe operation in industrial machines.

Automotive and aeronautics

A4 stainless key steel is used to make parts that are essential in steering systems, engines and transmissions for motor vehicles and the aeronautical sector, where reliability and safety are paramount.

Advantages of A4 stainless key steel

Precision & compatibility

With its h9 tolerance, A4 stainless bright key steel offers exceptional dimensional accuracy - and is thus perfectly compatible with DIN 6880-standard mechanical components.

Sturdiness & durability

A4 stainless steel is extremely sturdy and durable, capable of withstanding high loads and rough operating conditions, making for long-lasting joints.

Wear resistance

A4 stainless steel bars offer excellent wear resistance, minimising the need for frequent maintenance and replacements, making them a cost-effective and reliable choice for industrial applications.

How do I choose the right key steel?

When choosing a key steel bar, you should take into account:

  • Dimensions: The dimensions must match the grooves of the components.
  • Material: The type of stainless steel should be chosen in accordance with loads and operating conditions.
  • Standards: Make sure the steel complies with relevant industry standards, e.g. DIN 6880.

For applications that require high precision and maximum robustness, these bars of A4 stainless key steel are an excellent choice. Their dimensional tolerance and excellent mechanical properties make them an ideal choice for harsh industrial environments.

Installing keys made from our A4 stainless steel bars

Installation steps

  • Preparation: Make sure the keyway is clean and free of debris.
  • Inserting the key: Insert the A4 stainless steel key bar into the keyway.
  • Assembly: Slide the hub or pulley onto the shaft, aligning the groove (keyway) with the key.


In order to install a key, make sure you have a:

  • Hammer: To insert the key into the keyway.
  • Punch: To align the key correctly in the keyway.
  • Gauge: To check dimensional tolerances.

In summary, A4 stainless key steel to DIN 6880 is essential for various industrial applications. Its high precision, stability and wear resistance makes it a material of choice for the transmission of power and for fastening rotating components.

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