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DIN 2391 vs. EN 10305-1: Key Differences

1. Scope & Application

• DIN 2391:

  • A German standard for precision seamless steel tubes used in mechanical engineering, hydraulics, and pneumatics.

  • Focuses on tight tolerances (outer diameter, wall thickness) and high surface quality.

  • Common applications: Cylinder barrels, shafts, and precision components.

• EN 10305-1:

  • A European standard for seamless cold-drawn steel tubes for precision applications.

  • Part of the EN 10305 series (multiple parts covering different tube types).

  • Broader scope, including automotive, machinery, and general engineering.

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2. Material & Grades

• DIN 2391: Typically specifies non-alloy steels (e.g., St35, St52) with defined mechanical properties.

• EN 10305-1: Covers both non-alloy and alloy steels (e.g., E235, E355) with stricter chemical composition controls per EN standards.

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3. Tolerances

• Both standards emphasize tight tolerances, but:

  • DIN 2391 may have stricter requirements for roundness and straightness in high-precision applications.

  • EN 10305-1 provides tolerance classes (e.g., E1, E2, E3) with E1 being the tightest.

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4. Surface Finish

• DIN 2391: Often requires smoother surfaces (e.g., for hydraulic systems).

• EN 10305-1: Surface requirements vary by application but generally align with DIN 2391.

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5. Testing & Certification

• DIN 2391: Follows German testing norms (e.g., pressure tests, ultrasonic inspection).

• EN 10305-1: Complies with European-wide testing protocols (e.g., EN ISO 9001, hydrostatic/NDT tests).

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6. Regional Use

• DIN 2391: Primarily used in Germany and regions adopting German standards.

• EN 10305-1: Widely recognized across the EU and internationally (harmonized under EU directives).

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Summary

Note: EN 10305-1 is more modern and internationally recognized, while DIN 2391 remains relevant for specific German engineering demands. For export-oriented projects, EN 10305-1 is often preferred.