Technical Specifications & Standard Scope

DIN 2391 comprises two core segments:

Part 1: Defines dimensional requirements for seamless precision tubes, covering outer diameter, wall thickness, and tolerance classes.

Part 2: Outlines technical delivery conditions, including material grades, surface quality, and testing protocols.

While largely integrated into the European standard EN 10305-1, DIN 2391 remains widely recognized and specified for its stringent precision and quality assurance.

Key Features & Technical Advantages 

Exceptional Dimensional Accuracy: 

•Tight tolerances for outer diameter (±0.08 mm) and wall thickness (±0.10 mm) ensure seamless integration in precision assemblies.

•Superior concentricity and straightness minimize alignment issues in mechanical systems.

Optimized Surface Quality: 

•Smooth internal and external surfaces (typical roughness ≤6.3 μm) reduce friction and fluid resistance.

•Absence of scratches, scales, or imperfections enhances durability and corrosion resistance.

Enhanced Mechanical Properties:

•Cold-drawing process improves tensile strength, yield strength, and hardness while maintaining ductility.

•Excellent cold-forming capabilities support flaring, bending, and flattening without cracking.

Material Versatility & Customization  

Beyond standard carbon steels (e.g., ST35, ST45, ST52), Tenjan supports a wide range of customized material formulations, including:

•Carbon and alloy steel grades tailored to specific mechanical or environmental requirements.

•Modified chemistries for improved weldability, corrosion resistance, or strength-to-weight ratios.

Our expertise in material selection ensures optimal performance for specialized applications, from hydraulic cylinders to automotive shock absorbers.

Quality Assurance & Testing  

Tenjan’s DIN 2391 tubes undergo rigorous verification to guarantee compliance and reliability:

•Non-destructive testing: Eddy current or ultrasonic inspection detects internal or surface defects.

•Mechanical tests: Tensile strength, elongation, and flattening tests validate structural integrity.

•Dimensional checks: 100% measurement of critical parameters ensures conformity to specified tolerances.

Applications & Industry Solutions 

DIN 2391 tubes are ideal for sectors requiring precision, reliability, and efficiency:

•Hydraulic and Pneumatic Systems: Cylinder barrels, valve components, and high-pressure piping.

•Automotive Engineering: Shock absorber tubes, fuel injection systems, and steering components.

•Mechanical Machinery: Precision shafts, bearing housings, and equipment frames.

•Industrial Equipment: Robotics, conveyor systems, and tooling applications.

Tenjan’s Manufacturing Excellence 

Leveraging decades of experience in cold-drawn tubing, Tenjan delivers distinct advantages for DIN 2391 products:

•Advanced Cold-Drawing Technology: Ensures precise dimensions, superior surface finish, and enhanced mechanical properties.

•Customization Expertise: Support for special shapes (round, hexagonal, D-shaped) and tailored material grades.

•End-to-End Quality Control: From raw material selection to final inspection, every step is monitored to meet international standards.

•Global Compliance: Tubes adhere to DIN, EN, and customer-specific specifications, backed by certifications like ISO 9001 and IATF 16949.