EN 3078:2026

• Abstract:

  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.

• Status: Published
• Publication Date: 07-Jul-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: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 08-Jul-2026
• Completion Date: 08-Jul-2026
• Ref Project: SIST EN 3078:2026 - Aerospace series - P, Q and saddle clamps with rubber cushion - Technical Specification

• Refers: ISO 2859-1:2026 - Sampling procedures for inspection by attributes — Part 1: Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection
• Effective Date: 22-Jul-2026
• Refers: EN 10204:2004 - Metallic products - Types of inspection documents
• Effective Date: 22-Jul-2026
• Refers: EN ISO 21920-1:2022 - Geometrical product specifications (GPS) - Surface texture: Profile - Part 1: Indication of surface texture (ISO 21920-1:2021)
• Effective Date: 22-Jul-2026
• Refers: ISO 5855-2:1999 - Aerospace — MJ threads — Part 2: Limit dimensions for bolts and nuts
• Effective Date: 22-Jul-2026
• Refers: ISO 3161:1999 - Aerospace — UNJ threads — General requirements and limit dimensions
• Effective Date: 22-Jul-2026

EN 3078:2026 is a CEN European Standard for aerospace series P, Q and saddle clamps with rubber cushion. It specifies the required characteristics, inspection and test methods, quality assurance and delivery conditions for these clamps used in aerospace applications.

What does EN 3078:2026 specify?

EN 3078:2026 applies to P, Q and saddle clamps with rubber cushion for aerospace use. The document is organized into clauses on scope, normative references, terms and definitions, required characteristics and test methods, quality assurance, packaging and storage, and certificate of compliance.

Clause 4 sets the product characteristics and the inspection and test methods. Clause 5 covers acceptance of batches, user inspection and rejection. Clause 6 covers how the clamps are packed and stored, and clause 7 sets the certificate to be supplied with the order.

What are the key requirements of EN 3078:2026?

EN 3078:2026 ties product acceptance to defined characteristics, fixed test conditions and batch sampling rules. In practice, this means manufacturers and users can check the same items the same way, from material evidence to packaging and paperwork.

Product characteristics and inspection

Table 1 covers the main checks: materials, dimensions and tolerances, mass, marking, surface appearance and surface treatment. Materials are verified by chemical analysis or by a certificate of compliance for the metal strip, and by a certificate of compliance for the cushion. Dimensions and mass are measured with suitable equipment or methods, while marking and surface appearance are checked visually.

For acceptance, the document distinguishes product acceptance and production batch acceptance. That matters because some checks are applied to samples and others to all clamps in the batch.

Test conditions and check fixtures

Unless otherwise specified, the test temperature is between 15 °C and 25 °C. Clamp attachment bolts used for testing are steel bolts with resistance greater than or equal to 1 100 MPa, with thread sizes defined for metric or inch series clamps.

The test mandrel depends on the clamp type. For P, Q and type 1 saddle clamps, the mandrel diameter is smaller than the nominal clamp diameter by a specified amount, with a surface roughness of 1,6 μm and a straightness limit of 2 mm over 100 mm. For type 2 saddle clamps, the mandrel diameter is 0,2 mm greater than nominal, also with 1,6 μm roughness. This controls the fit condition used for checking the cushion and clamp geometry.

Dimensional checks and clamp fit

When an axial load is specified on the product standard, dimensions and load are measured without shim, using the relevant mandrel. Where no axial load is specified, P, Q and type 1 saddle clamps are checked with shim(s) of thickness S and the appropriate mandrel.

For type 2 saddle clamps, the mandrel and 0,2 mm shim arrangement is used to verify that there is no clearance between mandrel and cushion and no significant cushion deformation. That is the practical fit check for this clamp design.

Quality assurance, sampling and rejection

Clause 5 requires the manufacturer to be an approved production organization for aerospace products and to operate a quality management system, with EN 9100 given as an example. Batch acceptance uses sampling in accordance with ISO 2859-1.

Table 3 assigns AQL (acceptable quality level) values and inspection level I to the listed checks. Major defects use AQL 1.0 and minor defects use AQL 4.0. If non-destructive tests fail, the parts are rejected; major defects found during acceptance testing trigger rejection of the affected parts, while minor defects require a procedure from the user’s quality assurance department.

Packaging, storage and certificates

Clause 6 requires protection against damage, humidity, corrosion, dirt and other harmful attack during transport and storage. Parcel and collective packing labels carry the manufacturer name, quantity, and the product standard identification box, with additional order information for collective packings. Clause 7 requires a certificate of compliance with the order in accordance with EN 10204.

What terms does EN 3078:2026 define?

P clamp - A single metal strip formed into a P loop, used to support fluid pipes or cable bundles and retained by one fastener.

Q clamp - A single metal strip formed into a Q loop, used to support fluid pipes or cable bundles and retained by one fastener.

Saddle clamp - Two metal strips, each with a cushion, formed into a saddle; type 1 is fixed and type 2 is sliding, and both support fluid pipes or cable bundles with two fasteners.

Production batch - A definite quantity produced at one time under conditions assumed to be uniform.

Acceptable quality level (AQL) - The quality level used in sampling inspection as the limit of a satisfactory process average.

Major defect - A defect that is likely to cause failure or materially reduce usability for the intended purpose.

Minor defect - A defect that is unlikely to materially reduce usability or that departs from the specification with little effect on operation.

Who uses EN 3078:2026?

EN 3078:2026 is used by aerospace clamp manufacturers, incoming inspection teams, quality assurance departments and buyers who need a defined product standard for pipe and cable support clamps. It is also relevant to test laboratories and production organizations that must show batch acceptance, certification and packaging compliance for aerospace deliveries.

Which standards are used with EN 3078:2026?

• EN 10204 - defines the certificate of compliance document type used in clause 7.
• EN ISO 21920-1 - gives the surface texture indication used for the mandrel roughness requirement.
• ISO 2859-1 - provides the sampling procedures and AQL-based batch inspection method used in clause 5.
• ISO 3161 - gives general requirements and limit dimensions for UNJ threads used for inch-series clamp attachment bolts.
• ISO 5855-2 - gives limit dimensions for MJ threads used for metric-series clamp attachment bolts.
• EN 9100 - is cited as an example of an aerospace quality management system for manufacturer approval.

What does the EN 3078:2026 document contain?

EN 3078:2026 contains the product scope, the reference standards that support testing and certification, and the definitions used for the clamp types and quality terms. It also includes a table of required characteristics and inspection methods, plus tables and figures that set out the mandrel dimensions and the clamp test arrangements.

The document gives the procedures for materials checks, dimensional inspection, visual examination, batch sampling and rejection decisions. It also specifies packaging information and the certificate needed with the order, so it supports design review, production testing, batch acceptance and shipment control.

SLOVENSKI STANDARD
01-september-2026
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: EN 3078:2026
ICS:
49.030.99 Drugi vezni elementi Other fasteners
49.080 Letalski in vesoljski Aerospace fluid systems and
hidravlični sistemi in deli components
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 3078
EUROPEAN STANDARD
NORME EUROPÉENNE
July 2026
EUROPÄISCHE NORM
ICS 49.060
English Version
Aerospace series - P, Q and saddle clamps with rubber
cushion - Technical Specification
Série aérospatiale - Colliers en " P ", " Q " et " O " avec Luft- und Raumfahrt - Schellen in Schlaufen- (P- und Q-
profilés en élastomère - Spécification technique Form) und Sattel-Form mit Profilgummi - Technische
Lieferbedingungen
This European Standard was approved by CEN on 20 April 2026.

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 CEN-CENELEC Management Centre 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 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.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2026 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 3078:2026 E
worldwide for CEN national Members.

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
4.2.1 Test temperature . 6
4.2.2 Clamp attachment . 6
4.2.3 Test mandrel. 6
4.2.4 Check of dimensions . 7
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

European foreword
This document (EN 3078:2026) has been prepared by ASD-STAN.
After enquiries and votes carried out in accordance with the rules of this Association, this document has
received the approval of the National Associations and the Official Services of the member countries of
ASD-STAN, prior to its presentation to CEN.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by January 2027, and conflicting national standards shall
be withdrawn at the latest by January 2027.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: 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 the
United Kingdom.
1 Scope
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.
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
...