EN 4166:2004

Aerospace series - Clips, spring tension, three parts - PTFE bushes

This standard specifies the characteristics of PTFE bushes for three part clips, spring tension for applications at a maximum temperature of 260 °C, for aerospace applications.
They shall be assembled with parts from EN 4167 and EN 4168.

Luft- und Raumfahrt - Rohrschellen, federnd, dreiteilig - Hülsen aus PTFE

Diese Norm legt die Eigenschaften von Hülsen aus PTFE für dreiteilige, federnde Rohrschellen für Anwendungen bei einer Temperatur von max. 260 °C fest.
Sie sind mit Teilen nach EN 4167 und EN 4168 zusammenzubauen.

Série aérospatiale - Colliers de fixation à ressort en trois parties - Bagues en PTFE

Aerospace series - Clips, spring tension, three parts - PTFE bushes

General Information

• Status: Published
• Publication Date: 21-Dec-2004
• Withdrawal Date: 29-Jun-2005
• ICS: 49.080 - Aerospace fluid systems and components
• Technical Committee: ASD-STAN - Aerospace
• Drafting Committee: ASD-STAN/D 3 - Mechanical
• Current Stage: 9093 - Decision to confirm - Review Enquiry
• Start Date: 21-Jan-2025
• Completion Date: 14-May-2025
• Ref Project: SIST EN 4166:2005 - Aerospace series - Clips, spring tension, three parts - PTFE bushes

Relations

• Replaces: EN 4166:2003 - Aerospace series - Clips, spring tension, three parts - PTFE bushes
• Effective Date: 22-Dec-2008

Overview

EN 4166:2004 is a European aerospace standard that specifies the characteristics of PTFE bushes for three‑part spring‑tension clips used in aerospace fluid and hydraulic systems. The bushes are suitable for service at temperatures up to 260 °C and are intended to be assembled with the clip components defined in EN 4167 (inner clips) and EN 4168 (outer clips). The document defines configuration, dimensions, tolerances, material grades and marking and requires manufacturer quality systems conform to EN 9100.

Key Topics

• Scope and application: PTFE bushes for three‑part spring clips used in aerospace piping and tubing assemblies; maximum operating temperature 260 °C.
• Materials: PTFE per aerospace material specifications - AMS 3659 for tube diameters ≤ 12 mm and AMS 3660 for diameters > 12 mm.
• Dimensions & tolerances: Detailed dimensional drawings and tables (diameter codes, masses, tolerances in millimetres) are provided to ensure interchangeability and correct fit when assembled with EN 4167/EN 4168 components.
• Designation & marking: Product designation format and marking requirements follow EN 2424 (style A).
• Quality assurance: Manufacturers are required to implement quality systems in accordance with EN 9100 (aerospace quality management).
• Compatibility: Intended for assembly with heat‑resisting steel clips specified in EN 4167 and EN 4168 (FE‑PA2601 / A286).

Applications and Who Uses It

• Typical uses: Installation of spring‑tension three‑part clips on aerospace fluid and hydraulic tubing where PTFE bushings are needed to reduce wear, provide insulation and enable high‑temperature operation (up to 260 °C).
• Primary users: Aerospace OEMs, tier‑1 suppliers, parts manufacturers, design engineers, procurement and quality assurance teams working on aircraft fluid systems, hydraulic lines and related harnessing.
• Supply chain value: Ensures component interchangeability, consistent material selection (AMS specs), traceability via marking, and compliance with aerospace quality management expectations.

Related Standards

• EN 4167 - Clips, spring tension, three parts - Inner clips in heat resisting steel (FE‑PA2601 / A286)
• EN 4168 - Clips, spring tension, three parts - Outer clips in heat resisting steel (FE‑PA2601 / A286)
• EN 2424 - Marking of aerospace products
• EN 9100 - Quality management systems for aerospace manufacturers
• AMS 3659 / AMS 3660 - PTFE material specifications

EN 4166 is essential for anyone specifying or manufacturing PTFE bushes for three‑part spring clips in aerospace applications, helping ensure safe, high‑temperature performance and standardized fit with EN 4167/4168 clip assemblies.

Standards Content (Sample)

SLOVENSKI STANDARD
01-junij-2005
1DGRPHãþD
SIST EN 4166:2004
Aerospace series - Clips, spring tension, three parts - PTFE bushes
Aerospace series - Clips, spring tension, three parts - PTFE bushes
Luft- und Raumfahrt - Rohrschellen, federnd, dreiteilig - Hülsen aus PTFE
Série aérospatiale - Colliers de fixation a ressort en trois parties - Bagues en PTFE
Ta slovenski standard je istoveten z: EN 4166:2004
ICS:
49.080 /HWDOVNLLQYHVROMVNL Aerospace fluid systems and
KLGUDYOLþQLVLVWHPLLQGHOL components
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 4166
NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2004
ICS 49.080 Supersedes EN 4166:2003
English version
Aerospace series - Clips, spring tension, three parts - PTFE
bushes
Série aérospatiale - Colliers de fixation à ressort en trois Luft- und Raumfahrt - Rohrschellen, federnd, dreiteilig -
parties - Bagues en PTFE Hülsen aus PTFE
This European Standard was approved by CEN on 11 September 2003.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the Central Secretariat or to any CEN member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
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© 2004 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 4166:2004: E
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Contents                                                                        Page

Foreword.3
1 Scope .4
2 Normative references .4
3 Required characteristics.4
4 Designation .6
5 Marking .6
6 Quality assurance.6
Foreword
This document (EN 4166:2004) has been prepared by the Eur
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