EN 2603:2005

Overview

EN 2603:2005 - Aerospace series: Port ends for adaptors, threaded, with lockring - Geometric configuration - is a CEN standard that specifies the dimensional and geometric characteristics of port ends used with threaded adaptors and a lockring, assembled with an elastomer O‑ring for aerospace fluid systems. It defines the port geometry, functional sealing surfaces and tolerances required to ensure interchangeability and reliable sealing in aerospace applications.

Key topics and requirements

• Dimensional characteristics and tolerances: Detailed tables (Table 1 and Table 2) give port codes, nominal port diameter (d1), MJ thread sizes and associated dimensions (d6, d7, d8, d10, l5, l6, etc.) and tolerances for each port code. Example entries include port code 05 (d1 = 7.75 mm, MJ 6 × 1) and code 06 (d1 = 9.80 mm, MJ 8 × 1).
• Geometric configuration: Defines the shape and functional dimensioning of the conical sealing surface, lockring position before installation, nut end interfaces and manufacturing datum features (see Figure 1).
• Sealing interface: Specifies configuration for assemblies using an elastomer O‑ring and a lockring to retain adaptors.
• Surface roughness: Surface finish requirements are indicated relative to the sealing surface (per the figure) unless a design specifies otherwise.
• Designation: Standard provides a clear identification scheme (example: EN 2603-10) for use in technical documentation and procurement.
• Normative references: Relies on thread and interface standards such as ISO 5855‑1 / ISO 5855‑3 (MJ threads) and related EN 260x series documents (EN 2602, EN 2604–2607) and EN 2645 (lockring dimensions).

Applications and who uses it

• Aerospace hydraulic and pneumatic system designers specifying port interfaces for adaptors and fittings.
• Manufacturers of ports, adaptors, lockrings and O‑rings who require standard geometric and dimensional criteria for production and QA.
• Quality assurance and inspection teams verifying tolerances, thread forms and surface finishes.
• Procurement/specification engineers ensuring interchangeability across suppliers and compatibility with EN 2602/2607 defined parts.
• Certification bodies and maintenance organizations assessing conformity of fluid system components.

Related standards

• ISO 5855‑1, ISO 5855‑3 (MJ thread definitions)
• EN 2602 (ports for adaptors)
• EN 2604, EN 2605, EN 2606 (8°30′, 24° and 60° interfaces)
• EN 2607 (O‑rings for threaded adaptors with lockring)
• EN 2645 (lockring dimensions)

Keywords: EN 2603:2005, port ends for adaptors, threaded with lockring, geometric configuration, aerospace O‑ring ports, MJ threads, EN 2602, ISO 5855.