ISO 23748-2016 PDF

Full title and description

ISO 23748:2016 — Aerospace series — O-ring grooves — Dimensions. Specifies recommended groove (gland) geometries and dimensional tolerances for O‑rings used in aerospace static sealing applications, covering both radial (rod or bore mounted) and axial (face) sealing arrangements, with guidance on drawing presentation, surface finish and manufacturing tolerances to ensure reliable static seals in aerospace components.

Abstract

ISO 23748:2016 provides standardized dimensions and tolerances for O‑ring grooves (glands) intended for static sealing in aerospace systems. The document defines groove cross‑section geometries for radial and axial seals, dimensional limits and tolerances, recommendations for surface roughness and run‑out, and drawing/presentation rules so that O‑ring components and mating parts are compatible across designers, manufacturers and maintainers in the aerospace industry. An amendment (ISO 23748:2016/Amd 1:2021) updates specific items introduced after initial publication.

General information

• Status: Published (current; confirmed)
• Publication date: October 2016 (Edition 1); Amendment 1 published February 2021
• Publisher: International Organization for Standardization (ISO)
• ICS / categories: 49.080, 49.100 (aerospace fluid systems/components; ground service & maintenance equipment)
• Edition / version: Edition 1 (2016) with Amendment 1 (2021)
• Number of pages: 30

Scope

The standard applies to the dimensions of grooves intended for use with elastomeric O‑rings in aerospace static sealing applications. It covers radial sealing (rod or bore mounted O‑rings) and axial sealing (internal or external pressure across a face) and gives recommended groove geometries, dimensional tolerances, and related drawing/presentation requirements to achieve reliable static seals. It is intended for seals used in aerospace hardware rather than dynamic rotary or reciprocating seals or fluid‑power O‑ring specifications outside static sealing contexts.

Key topics and requirements

• Standardized groove (gland) geometries for radial and axial O‑ring installations.
• Dimensional limits and tolerances for groove width, depth and mating diameters to ensure proper squeeze/fill for static seals.
• Recommendations on surface finish/roughness in sealing areas to avoid leak paths or extrusion.
• Run‑out and concentricity tolerances relevant to gland performance and assembly.
• Drawing, dimensioning and presentation rules for unambiguous specification of grooves on engineering drawings.
• Compatibility guidance with related O‑ring dimensional standards (selection of O‑ring cross‑sections and designation).

Typical use and users

Design and mechanical engineers in aerospace OEMs and suppliers, hydraulic/pneumatic system designers, seal and component manufacturers, quality and inspection teams, maintenance and MRO organizations, and procurement/specification authors use ISO 23748:2016 to ensure consistent groove geometry and interchangeability of O‑ring seals across components and supply chains. It is used when designing static sealing interfaces in aircraft, spacecraft and associated ground support equipment.

Related standards

Standards commonly used together with ISO 23748:2016 include ISO 3601 (O‑rings — dimensional designation and tolerances), ISO 286 (tolerance systems for fits and limits), and national/adopted equivalents such as BS ISO 23748:2016. Other aerospace fluid‑system and sealing standards from ISO/TC 20/SC 10 may be relevant depending on the application.

Keywords

O‑ring, groove, gland, static sealing, aerospace, radial seal, axial seal, dimensions, tolerances, surface roughness, run‑out, ISO/TC 20/SC 10

FAQ

Q: What is this standard?

A: ISO 23748:2016 is an International Standard that specifies recommended groove dimensions and related requirements for O‑rings used in aerospace static sealing applications.

Q: What does it cover?

A: It covers groove geometries for radial and axial O‑ring installations, dimensional tolerances, surface finish recommendations, run‑out/concentricity considerations and drawing/presentation rules to ensure reliable static seals in aerospace hardware.

Q: Who typically uses it?

A: Aerospace designers, seal and component manufacturers, quality inspectors, maintenance/MRO organizations and procurement/specification writers who need consistent, interoperable O‑ring groove dimensions for static seals.

Q: Is it current or superseded?

A: The standard was published in October 2016 (Edition 1) and remains current; it has an amendment published in February 2021 (ISO 23748:2016/Amd 1:2021) that updates specific items.

Q: Is it part of a series?

A: Yes — it is part of the aerospace series of standards and is associated functionally with other O‑ring and sealing standards (for example the ISO 3601 series) and with documents developed by ISO/TC 20/SC 10.

Q: What are the key keywords?

A: O‑ring, groove (gland), static seal, radial seal, axial seal, aerospace sealing, dimensions, tolerances, surface finish.