ISO 2964:1985

Overview

ISO 2964:1985 is an international standard developed by the International Organization for Standardization (ISO) that specifies the metric outside diameters and thicknesses of metallic tubing used in aerospace applications. This standard is essential for selecting tubes in aircraft structural and system design, ensuring uniformity, compatibility, and safety across aerospace manufacturing and maintenance.

First published in 1974 and updated in this second edition of 1985, ISO 2964 provides a technical revision focused on defining standard dimensions for tubing used in all types of aircraft systems. It covers tubing dimensions for all metallic materials, with precise guidance on external diameters and wall thicknesses, designed to meet rigorous aerospace industry requirements.

Key Topics

• Scope and Application
  ISO 2964 specifies standardized outside diameters and thicknesses for metallic tubes used in aircraft structural components and systems. This applies broadly to tubing materials commonly used in aerospace, ensuring interchangeability and compliance with aerospace engineering needs.

• Standardized Dimensions
  The standard includes tables that define the acceptable metric diameters and thicknesses that tubing must conform to. This enables designers and manufacturers to select from established sizes that have been verified for fit, strength, and compatibility.

• Tolerances
  While ISO 2964 outlines the dimensions, it delegates the specification of manufacturing tolerances to relevant material-specific standards. This means tolerances will vary by material type and intended application but must comply with associated aerospace standards for quality and safety.

• International Collaboration
  Developed by ISO Technical Committee ISO/TC 20 on Aircraft and Space Vehicles, this standard reflects a consensus of aerospace industry experts worldwide, supporting consistent global practices.

Applications

• Aircraft Structural Design
  Engineers rely on ISO 2964 to select tubing that meets exact diameter and thickness requirements, crucial for maintaining structural integrity of airframes and load-bearing assemblies.

• Aircraft Systems and Equipment
  Tubing adhering to these metrics is used in hydraulic, fuel, pneumatic, and other aircraft systems where precise dimensions affect fluid flow, pressure tolerance, and system reliability.

• Aerospace Manufacturing and Maintenance
  Suppliers and maintenance teams use ISO 2964 to verify tubing specifications, ensuring parts replacements and repairs meet original equipment manufacturer (OEM) standards and maintain certification.

• Material Selection and Specification
  The standard supports all metallic materials used for aerospace tubes, facilitating material-specific quality control and engineering evaluations while standardizing tubing dimensions.

Related Standards

• ISO Material Standards
  For specifying tolerances, material properties, and performance requirements, ISO 2964 works in conjunction with material-specific ISO standards relevant to aerospace metals such as stainless steels and aluminum alloys.

• ISO/TC 20 Standards
  Other aerospace-related standards from ISO Technical Committee 20 complement ISO 2964 by covering dimensions and specifications for aerospace fasteners, tubing fittings, and other related components.

• Aerospace Quality Assurance Standards
  Tubing selected under ISO 2964 will often comply with broader aerospace quality and safety standards such as AS9100 or equivalent national aerospace material guidelines, ensuring holistic system compliance.

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