DIN 938 – M10x40 – A2-70-L2A: Specifications, Applications & Buying Guide

din 938 - m10x40 - a2-70-l2a

1. Introduction

The DIN 938 – M10x40 – A2-70-L2A is a widely used double-ended stud bolt known for its durability and strength. This type of stud bolt is primarily used in industries where high fastening reliability is required. Understanding its specifications, material properties, and applications is essential for selecting the right fastener for engineering and industrial needs.

2. Understanding DIN 938 – M10x40 – A2-70-L2A

To break down the designation, let’s analyze each part:

  • DIN 938: This refers to the German Institute for Standardization (Deutsches Institut für Normung), specifying the requirements for double-ended stud bolts with a reduced shank.
  • M10: The metric thread size is 10mm in diameter.
  • 40: Indicates the total length of the stud bolt, which is 40mm.
  • A2-70: Represents the stainless steel grade (A2) and tensile strength of 700 N/mm².
  • L2A: A manufacturer or additional specification used for identification.

These features make it suitable for applications requiring strong, corrosion-resistant fastening solutions.

3. DIN 938 Standard Explained

DIN 938 is a standard for double-ended stud bolts with a reduced shank, providing strong fastening with enhanced grip. Unlike DIN 939, which features a fully threaded design, DIN 938 includes an unthreaded section in the middle. This design enhances load distribution and reduces stress concentrations, making it ideal for industrial applications.

Comparison Table: DIN 938 vs. Other Stud Bolts

FeatureDIN 938DIN 939DIN 976
DesignReduced ShankFully ThreadedFully Threaded
ApplicationHigh Load FasteningGeneral UseThreaded Rods
StrengthHighModerateModerate

4. Technical Specifications

The DIN 938 – M10x40 – A2-70-L2A stud bolt follows precise dimensions and tolerances to ensure a reliable fit.

Dimensional Details

PropertySpecification
Thread DiameterM10
Total Length40mm
Thread Pitch1.5mm
Strength Class700 N/mm²
MaterialA2 Stainless Steel

These technical properties ensure that the stud bolt can withstand high tensile loads and offer excellent corrosion resistance.

5. Material and Mechanical Properties

The A2-70 stainless steel material used in this stud bolt provides excellent mechanical and environmental resistance.

Key Properties of A2-70 Stainless Steel:

  1. Corrosion Resistance – Ideal for outdoor and marine applications.
  2. High Tensile Strength – Ensures a secure hold under heavy loads.
  3. Non-Magnetic Properties – Suitable for specialized applications.
  4. Temperature Resistance – Can withstand high and low temperatures without losing strength.

6. Manufacturing and Quality Standards

DIN 938 – M10x40 – A2-70-L2A stud bolts undergo strict quality control processes to ensure compliance with engineering standards. These include:

  • Dimensional accuracy testing
  • Tensile strength testing
  • Corrosion resistance assessment
  • Surface finishing checks

Manufacturers must adhere to ISO 9001 standards for quality assurance, ensuring reliability and consistency in production.

7. Applications and Industry Usage

The versatility of the DIN 938 – M10x40 – A2-70-L2A makes it suitable for various industries, including:

  • Automotive – Used in engine mounting and chassis connections.
  • Construction – Essential in securing structural components.
  • Machinery – Common in industrial equipment and heavy machinery.
  • Aerospace – Used in high-strength fastening applications.

8. Installation and Best Practices

Proper installation of DIN 938 – M10x40 – A2-70-L2A is crucial for ensuring long-term performance and safety. Follow these best practices:

  1. Select the Right Torque – Over-tightening can damage threads, while under-tightening may lead to loosening.
  2. Use Locking Mechanisms – Lock washers or thread-locking compounds prevent loosening due to vibration.
  3. Check Thread Engagement – Ensure full engagement with the mating surface for maximum holding power.
  4. Regular Inspection – Periodically inspect fasteners for signs of wear or corrosion.

9. Comparison with Similar Fasteners

When selecting a stud bolt, comparing it with alternatives can help in making an informed decision. DIN 938 provides a unique advantage with its reduced shank, which improves load distribution compared to fully threaded alternatives like DIN 939 and DIN 976.

When to Choose DIN 938 Over Other Standards:

  • If high shear strength is required.
  • When load-bearing capacity is a priority.
  • If corrosion resistance is necessary in harsh environments.

10. Purchasing Guide and Availability

When buying DIN 938 – M10x40 – A2-70-L2A stud bolts, consider these factors:

  1. Material Authenticity – Ensure the product is made from certified A2-70 stainless steel.
  2. Supplier Reputation – Buy from reputable manufacturers who follow quality standards.
  3. Bulk Ordering Discounts – Many suppliers offer better rates for bulk purchases.
  4. Customization Options – Some manufacturers provide customized lengths and coatings.

11. Conclusion

The DIN 938 – M10x40 – A2-70-L2A stud bolt is an excellent choice for applications requiring strong, corrosion-resistant fastening. With its precise engineering, high strength, and reliable performance, it is widely used across various industries. Understanding its specifications, applications, and installation best practices ensures optimal performance and durability. Whether used in automotive, construction, or industrial machinery, this stud bolt remains a critical component in modern engineering solutions.

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