ISO 8177:2021

Aerospace - Omega clamps (saddle clamps) for fluid systems - Dimensions

This document specifies maximum and minimum dimensions for omega clamps (saddle clamps) installed by means of two bolts with nominal diameters of 5 mm. The specified dimensions define a dimensional envelope. This document is not an interchangeability standard. The tolerances for each type of clamp are defined in the drawings in the standards for parts.

Aéronautique et espace — Colliers en oméga pour systèmes de fluides — Dimensions

General Information

• Status: Published
• Publication Date: 07-Dec-2021
• ICS: 49.080 - Aerospace fluid systems and components
• Technical Committee: ISO/TC 20/SC 10 - Aerospace fluid systems and components
• Drafting Committee: ISO/TC 20/SC 10 - Aerospace fluid systems and components
• Current Stage: 6060 - International Standard published
• Start Date: 08-Dec-2021
• Due Date: 06-Nov-2023
• Completion Date: 08-Dec-2021

Relations

• Revises: ISO 8177:2015 - Aerospace - Omega clamps (saddle clamps) for fluid systems - Dimensions
• Effective Date: 17-Jul-2021

Overview

ISO 8177:2021 is an international standard that defines the maximum and minimum dimensions for aerospace omega clamps, also known as saddle clamps, used in fluid systems. These clamps are designed for installation by means of two bolts with a nominal diameter of 5 mm. The standard provides a defined dimensional envelope to ensure consistent sizing and fit but does not establish interchangeability between clamp types. Tolerances for each clamp type are specified in the related parts standards.

Developed by ISO Technical Committee ISO/TC 20, Subcommittee SC 10, this fourth edition updates previous versions by including additional clamp dimensions to meet evolving aerospace industry requirements. The standard aims to support the design, manufacture, and application of omega clamps in aerospace fluid systems to maintain safety, reliability, and performance.

Key Topics

• Dimension Specifications
  ISO 8177:2021 specifies precise maximum and minimum dimensions for omega clamps, encompassing attributes such as clamp width, height, bolt hole placement, and tube opening size. These dimensions define the clamp envelope essential for secure tubing fixation.

• Clamp Types and Temperature Ranges
  The standard classifies omega clamps into six types based on the temperature ranges they are rated for, from -55°C up to +650°C. This classification supports selection according to aerospace operational environments.

• Clamp Construction
  Omega clamps are multi-component assemblies consisting of a contoured base and a top band that align via mounting holes. They may be supplied with or without cushions or sheathings made from plastomer or elastomer materials to protect tubing and absorb vibrations.

• Applications Beyond Fluid Systems
  While primarily intended for rigid tubing or hose assemblies in aerospace fluid systems, these clamps may also be applied for securing electrical cables or wiring looms.

Applications

• Aerospace Fluid System Installation
  Omega clamps standardized by ISO 8177:2021 are vital for mounting, supporting, and guiding rigid tubing and hoses in aerospace vehicles. Correct clamp dimensions enable secure attachment to aircraft and spacecraft fluid systems, ensuring system integrity under varying pressure and temperature conditions.

• Thermal and Mechanical Stability
  By selecting the appropriate clamp type for the operating temperature, aerospace engineers can maintain system performance and safety in harsh environments, including high-temperature engine compartments and cryogenic conditions.

• Electrical and Cable Management
  Due to their robust design and standardized dimensions, these clamps are also practical for organizing electrical cables and loom assemblies in confined aerospace spaces where vibration resistance and secure routing are critical.

Related Standards

• ISO 6771 - Aerospace Fluid Systems and Components – Pressure and Temperature Classifications
  ISO 8177 references ISO 6771 for temperature classifications corresponding to clamp types, ensuring harmonization across aerospace fluid system components.

• Parts Standards for Omega Clamps
  For details on tolerances and material specifications, specific parts standards governing the manufacturing of omega clamps complement ISO 8177 by defining the acceptable quality levels for each clamp variant.

Summary

ISO 8177:2021 is essential for aerospace engineers, manufacturers, and maintenance professionals involved in fluid system design and installation. By defining clear dimensional requirements for omega clamps, it helps ensure compatibility, reliability, and safety in aerospace applications. This standard supports the secure mounting of tubing and cables in diverse temperature conditions, contributing to the overall performance and durability of aerospace systems.

Keywords: ISO 8177, omega clamps, saddle clamps, aerospace fluid systems, clamp dimensions, aerospace tubing support, fluid system clamps, temperature classification, aerospace standards, tubing clamps

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 8177
Fourth edition
2021-12
Aerospace — Omega clamps
(saddle clamps) for fluid systems —
Dimensions
Aéronautique et espace — Colliers en oméga pour systèmes de fluides
— Dimensions
Reference number
© ISO 2021
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
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Published in Switzerland
ii
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Field of application . 1
5 Field of use . 1
6 Description . .2
7 Dimensions .2
Bibliography . 4
iii
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