DIN 938 - M10x40 - A2-70-L2A: Everything You Need to Know

The DIN 938 – M10x40 – A2-70-L2A bolt is a high-quality, standardized fastener with precise specifications. These bolts are widely used in various industries, including automotive, construction, marine, and aerospace, for their strength, durability, and corrosion resistance.

In this article, we’ll delve into the details of this bolt specification and address some common questions to help you understand its properties, applications, and advantages.

Table of Contents

What Does DIN 938 – M10x40 – A2-70-L2A Mean?

DIN 938: The Standard for Quality Fasteners

The DIN 938 refers to a bolt specification developed by the Deutsches Institut für Normung (German Institute for Standardization). The DIN system ensures that fasteners are manufactured to consistent quality standards, promoting safety and reliability in industrial applications.

M10 indicates a 10 millimeter diameter bolt, using a metric thread system.

40 refers to the 40 millimeter length of the bolt.

A2 represents the material composition, specifically A2 stainless steel, a highly corrosion-resistant material.

70 refers to the tensile strength of the bolt, which is 700 MPa (megapascals).

L2A denotes a special surface treatment applied to enhance the bolt’s corrosion resistance.

These specifications work together to ensure that the DIN 938 – M10x40 – A2-70-L2A bolt is a reliable and durable fastener for various industrial applications.

Understanding the Specifications of the DIN 938 – M10x40 – A2-70-L2A Bolt

M10x40: Size and Dimensions

The M10x40 part of the specification tells us about the size and length of the bolt. Specifically:

M10: The 10 millimeter diameter of the bolt, which is suitable for medium-duty applications where moderate strength is required.

40: The 40 millimeter length of the bolt, which is ideal for securing components in mechanical assemblies that require this length.

These dimensions are particularly useful for medium-strength applications, making this bolt a versatile choice for various industries.

Material: Why A2 Stainless Steel?

The A2 in DIN 938 – M10x40 – A2-70-L2A refers to A2 stainless steel. This material is specifically chosen for its:

Corrosion Resistance: A2 stainless steel offers exceptional resistance to rust, oxidation, and corrosion, making it ideal for use in outdoor, marine, and industrial environments.

Strength and Durability: With high tensile strength and mechanical properties, A2 stainless steel bolts are capable of withstanding mechanical stress without deforming.

These properties make A2 stainless steel an ideal material for bolts used in demanding environments where reliability is critical.

Tensile Strength: What Does 700 MPa Mean?

The 70 in the bolt’s designation indicates its tensile strength of 700 MPa. This measurement shows how much force the bolt can withstand before breaking under tension.

700 MPa tensile strength ensures that the bolt can handle heavy loads and mechanical stresses without snapping, which is critical in applications that require high strength and durability.

This tensile strength rating makes the DIN 938 – M10x40 – A2-70-L2A bolt suitable for use in industries where bolts are subjected to significant loads.

Surface Treatment: What is L2A?

The L2A refers to the specific surface treatment applied to the bolt, typically a passivation process that enhances the bolt’s ability to resist corrosion and wear.

Corrosion Resistance: The surface treatment ensures that the bolt remains resistant to rust and oxidation, even in harsh environments.

Durability: By improving the surface’s resistance to wear, the L2A treatment prolongs the life of the bolt.

These surface treatments make the DIN 938 – M10x40 – A2-70-L2A bolt ideal for long-term, reliable performance in exposed environments.

Common Applications of DIN 938 – M10x40 – A2-70-L2A Bolts

Automotive Industry

The DIN 938 – M10x40 – A2-70-L2A bolt is commonly used in the automotive industry. It plays an essential role in securing engine parts, chassis components, and other machinery that requires high strength and corrosion resistance.

Engine Assemblies: These bolts are used to fasten engine parts that need to withstand high temperatures and mechanical stresses.

Structural Components: They are crucial in assembling the frame and chassis of vehicles, ensuring the strength of the entire structure.

Construction and Civil Engineering

In construction, the DIN 938 – M10x40 – A2-70-L2A bolt is used in a variety of ways:

Steel Structures: Fastening steel beams, reinforcement bars, and other structural components in large construction projects.

Heavy Machinery: Securing mechanical parts in machines used in construction sites, ensuring the machinery remains operational under heavy stress.

Marine Applications

The corrosion resistance of A2 stainless steel makes this bolt ideal for marine applications, where exposure to saltwater and moisture is common:

Boatbuilding: Securing the structural components of boats and yachts that are constantly exposed to the marine environment.

Offshore Oil Rigs: These bolts are used to fasten equipment on offshore platforms, where the risk of corrosion is high.

Aerospace Industry

In aerospace, the DIN 938 – M10x40 – A2-70-L2A bolt is crucial for applications where reliability and strength are vital:

Aircraft Assembly: Fastening critical parts of aircraft, such as engines and fuselage components.

Spacecraft: These bolts are used in spacecraft where they must withstand extreme temperatures, pressures, and mechanical stresses.

FAQs About DIN 938 – M10x40 – A2-70-L2A Bolts

What is the tensile strength of the DIN 938 – M10x40 – A2-70-L2A bolt?

The tensile strength of the DIN 938 – M10x40 – A2-70-L2A bolt is 700 MPa. This rating ensures that the bolt can handle heavy loads without breaking under tension. Its high tensile strength makes it ideal for applications in industries where fasteners must endure significant mechanical stress.

Why is A2 stainless steel used for this bolt?

A2 stainless steel is used for the DIN 938 – M10x40 – A2-70-L2A bolt because of its excellent corrosion resistance and strength. It is particularly suitable for use in outdoor, marine, and industrial applications, where resistance to rust and corrosion is essential. Additionally, A2 stainless steel provides the bolt with the necessary strength to perform under high mechanical loads.

What does the L2A surface treatment do?

The L2A surface treatment applied to the DIN 938 – M10x40 – A2-70-L2A bolt enhances its corrosion resistance and wear resistance. This treatment helps protect the bolt from rust, oxidation, and damage caused by friction, making it more durable and suitable for long-term use in demanding environments.

Conclusion

The DIN 938 – M10x40 – A2-70-L2A bolt is an essential fastener used across multiple industries, including automotive, construction, marine, and aerospace.

With its robust specifications, including A2 stainless steel, 700 MPa tensile strength, and L2A surface treatment, this bolt ensures strength, reliability, and long-term performance in critical applications.

Whether you need to fasten engine parts, structural components, or marine equipment, the DIN 938 – M10x40 – A2-70-L2A bolt is a top choice for engineers and manufacturers worldwide.