FprEN 3078

Aerospace series - P, Q and saddle clamps with rubber cushion - Technical Specification

This document specifies the required characteristics, inspection and test methods, quality assurance and delivery conditions, for P, Q and saddle clamps with rubber cushion, used for aerospace applications.

Luft- und Raumfahrt - Schellen in Schlaufen- (P- und Q-Form) und Sattel-Form mit Profilgummi - Technische Lieferbedingungen

No Scope available

Série aérospatiale - Colliers en « P », « Q » et « Ω » avec profilés en élastomère - Spécification technique

Le présent document spécifie les caractéristiques requises, les méthodes de contrôle et d'essai, l'assurance qualité et les conditions de livraison des colliers en « P », « Q » et « Ω » avec profilés (coussins) en élastomère, utilisés pour les applications aérospatiales.

Aeronavtika - Objemke tipa P, Q in cevne objemke z zaščitno obrobno prevleko iz gume - Tehnična specifikacija

General Information

• Status: Not Published
• Publication Date: 21-Jun-2026
• ICS: 49.060 - Aerospace electric equipment and systems
• ICS: 49.080 - Aerospace fluid systems and components
• Technical Committee: ASD-STAN - Aerospace
• Drafting Committee: ASD-STAN/D 3/S 3 - Hydraulics
• Current Stage: 4599 - Dispatch of FV draft to CMC - Finalization for Vote
• Start Date: 19-Nov-2025
• Completion Date: 19-Nov-2025
• Ref Project: kSIST FprEN 3078:2025 - Aerospace series - P, Q and saddle clamps with rubber cushion - Technical Specification

Overview

FprEN 3078 (prEN 3078:2024) - "Aerospace series - P, Q and saddle clamps with rubber cushion - Technical Specification" is a CEN draft technical specification prepared by ASD‑STAN. It defines the required characteristics, inspection and test methods, quality assurance and delivery conditions for P clamps, Q clamps and saddle clamps with rubber cushions used to support pipes, hoses and cable bundles in aerospace applications.

Key topics and technical requirements

• Scope and definitions: Clarifies clamp types - P (single P‑loop), Q (single Q‑loop) and saddle (two strips; fixed or sliding) - and their intended use for fluid pipes and cable bundles.
• Materials and certificates: Metal strip and cushion materials must conform to product design or material standards. Acceptable evidence includes chemical analysis or a certificate of compliance from the semi‑finished product manufacturer; hardness or tensile tests may also be required.
• Inspection and test methods: Includes dimensional checks, mass, marking, surface appearance and surface treatment inspections. Test conditions specify a test temperature of 15 °C to 25 °C.
• Test mandrels and clamp attachment:
  • Mandrel diameters and tolerances are specified relative to nominal clamp diameter (Table values in the standard). Surface roughness for mandrels: R = 1.6 µm per EN ISO 21920‑1.
  • Default clamp attachment bolts: steel with tensile strength ≥ 1 100 MPa using metric MJ 5 × 0.8 or UN thread equivalents per ISO 5855‑2 and ISO 3161.
• Quality assurance and sampling: Manufacturer approval required; implementation of a recognised aerospace QMS (e.g. EN 9100) is expected. Lot acceptance uses sampling per ISO 2859‑1 with Acceptable Quality Levels: Major AQL = 1.0, Minor AQL = 4.0.
• Packaging, storage and documentation: Protection from humidity/corrosion, parcel/packing labels, and delivery certificate per EN 10204.

Applications

• Use for specification, procurement and acceptance testing of rubber‑cushioned clamps on aircraft and spacecraft systems.
• Relevant to mechanical installations, fluid/hydraulic lines, wiring harness retention and structural routing in aerospace platforms.

Who should use this standard

• Aerospace component manufacturers and suppliers of clamps and cushions
• Procurement, quality assurance and inspection teams in OEMs and MRO organisations
• Design engineers specifying clamp selection and installation criteria
• Test laboratories performing acceptance and production testing

Related standards

• EN 10204 (inspection documents)
• EN ISO 21920‑1 (surface texture)
• ISO 2859‑1 (sampling procedures)
• ISO 3161, ISO 5855‑2 (thread dimensions)
• EN 9100 (aerospace QMS)

Keywords: P clamp, Q clamp, saddle clamp, rubber cushion, aerospace clamps, FprEN 3078, prEN 3078, technical specification, inspection and test methods, quality assurance.

Standards Content (Sample)

SLOVENSKI STANDARD
oSIST prEN 3078:2024
01-september-2024
Aeronavtika - Objemke tipa P, Q in cevne objemke z zaščitno obrobno prevleko iz
gume - Tehnična specifikacija
Aerospace series - P, Q and saddle clamps with rubber cushion - Technical Specification
Luft- und Raumfahrt - Schellen in Schlaufen- (P- und Q-Form) und Sattel-Form mit
Profilgummi - Technische Lieferbedingungen
Série aérospatiale - Colliers en « P », serrage central et « Ω » avec profiles en
élastomère - Spécification technique
Ta slovenski standard je istoveten z: prEN 3078
ICS:
49.030.99 Drugi vezni elementi Other fasteners
49.080 Letalski in vesoljski Aerospace fluid systems and
hidravlični sistemi in deli components
oSIST prEN 3078:2024 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

oSIST prEN 3078:2024
oSIST prEN 3078:2024
DRAFT
EUROPEAN STANDARD
prEN 3078
NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2024
ICS 49.060; 49.080
English Version
Aerospace series - P, Q and saddle clamps with rubber
cushion - Technical Specification
Série aérospatiale - Colliers en " P ", serrage central et " Luft- und Raumfahrt - Schellen in Schlaufen- (P- und Q-
O " avec profiles en élastomère - Spécification Form) und Sattel-Form mit Profilgummi - Technische
technique Lieferbedingungen
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee ASD-
STAN.
If this draft becomes a European Standard, 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.

This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC
Management Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2024 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 3078:2024 E
worldwide for CEN national Members.

oSIST prEN 3078:2024
prEN 3078:2024 (E)
Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
3.1 Clamps . 4
3.2 Quality assurance . 5
4 Required characteristics, inspection and test methods . 5
4.1 General. 5
4.2 Test conditions . 6
5 Quality assurance . 9
5.1 Approval of manufacturer . 9
5.2 Acceptance conditions . 9
5.3 User’s quality control . 9
5.4 Rejection . 10
6 Packaging and storage . 10
6.1 General. 10
6.2 Parcel information . 10
6.3 Collective packings, for transport . 10
7 Certificate of compliance with the order . 10
Bibliography . 11

oSIST prEN 3078:2024
prEN 3078:2024 (E)
European foreword
This document (prEN 3078:2024) has been prepared by the Aerospace and Defence Industries
Association of Europe — Standardization (ASD-STAN).
This document is currently submitted to the CEN Enquiry.
oSIST prEN 3078:2024
prEN 3078:2024 (E)
1 Scope
This document specifies the required characteristics, inspection test methods, quality assurance and
delivery conditions, for P, Q and saddle clamps with rubber cushion, used for aerospace applications.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
EN 10204, Metallic products - Types of inspection documents
EN ISO 21920-1, Geometrical product specifications (GPS) - Surface texture: Profile - Part 1: Indication of
surface texture (ISO 21920-1)
ISO 2859-1, Sampling procedures for inspection by attributes — Part 1: Sampling schemes indexed by
acceptance quality limit (AQL) for lot-by-lot inspection
ISO 3161, Aerospace — UNJ threads — General requirements and limit dimensions
ISO 5855-2, Aerospace — MJ threads — Part 2: Limit dimensions for bolts and nuts
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at https://www.electropedia.org/
3.1 Clamps
3.1.1
“P” clamp
single metal strip formed into a “P loop” (see Figure 1)
Note 1 to entry: Used to support fluid pipes or cable bundles. Retained by a single fastener.
3.1.2
“Q” clamp
single metal strip formed into a “Q loop” (see Figure 2)
Note 1 to entry: Used to support fluid pipes or cable bundles. Retained by a single fastener.
3.1.3
“saddle” clamp
two meta
...