ISO 2964:2025

Overview

ISO 2964:2025 - "Aerospace - Tubing outside diameters and thicknesses - Metric dimensions" establishes a standard set of metric outside diameters and wall thicknesses for metallic tubing used in aircraft structural and system design. The third edition updates and expands the series of standard tube sizes for aerospace use and is intended as a selection table for designers, manufacturers and procurement specialists.

Key topics and technical requirements

• Scope: Defines outside diameters and thicknesses of tubes for all metallic materials intended for any use in aircraft structures and systems.
• Standardized sizes: Table 1 provides the authorised metric outside diameters (ranging from about 1.6 mm up to 100 mm) and a selectable set of wall thicknesses (column headers show thickness options from 0.25 mm to 10 mm).
• Tolerances: Tolerances for dimensions are specified in the relevant material- and application-specific standards and are listed in Table 1; ISO 2964 itself does not introduce separate normative reference documents.
• Edition notes: This third edition cancels and replaces ISO 2964:1985 and adds a revised standard series of diameters and thicknesses for aircraft use.
• Standards context: Prepared by ISO/TC 20/SC 10 (Aerospace fluid systems and components); no additional normative references or terms/definitions are included in the document.

Practical applications

ISO 2964:2025 is a practical selection tool and reference for:

• Aerospace designers and structural engineers specifying tubing for primary and secondary airframe structures and onboard systems.
• Fluid system and hydraulic designers selecting compatible metallic tube sizes for pipelines, actuator lines and fittings.
• Manufacturers and tube suppliers standardizing production runs and inventory using aerospace-accepted diameters and wall thicknesses.
• Procurement, quality and maintenance teams ensuring interchangeability, traceability and compliance with aerospace dimensional expectations.

Using ISO 2964 helps reduce design iteration, improve supplier compatibility, and streamline spare-part management by aligning tubing choices with an internationally recognized size series.

Related information

• Table 1 of ISO 2964 lists the agreed metric outside diameters and wall thickness combinations for aircraft use.
• Tolerance details should be cross-checked against material-specific and application-specific standards (as noted in ISO 2964).
• For terminology and additional standardization context see the ISO Online Browsing Platform and IEC Electropedia.

Keywords: ISO 2964:2025, aerospace tubing, tubing outside diameters, tube thicknesses, metric dimensions, aircraft tubing standards, tubing tolerances, aerospace fluid systems.