SIST 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
• Public Enquiry End Date: 04-Sep-2024
• Publication Date: 21-Jul-2026
• ICS: 49.030.99 - Other fasteners
• ICS: 49.060 - Aerospace electric equipment and systems
• ICS: 49.080 - Aerospace fluid systems and components
• Technical Committee: I13 - Imaginarni 13
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 21-Jul-2026
• Due Date: 25-Sep-2026
• Completion Date: 22-Jul-2026
• Ref Project: EN 3078:2026 - Aerospace series - P, Q and saddle clamps with rubber cushion - Technical Specification

• Refers: SIST 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: SIST EN 10204:2004 - Metallic products - Types of inspection documents
• Effective Date: 22-Jul-2026

SIST EN 3078:2026 is the Slovenian adoption of EN 3078:2026. It is an aerospace technical specification for P, Q and saddle clamps with rubber cushion, used to support fluid pipes or cable bundles. The standard sets the required characteristics, inspection and test methods, quality assurance, and delivery conditions so manufacturers and users can check the clamps against the approved product standard or design documentation.

What does SIST EN 3078:2026 specify?

SIST EN 3078:2026 applies to P, Q and saddle clamps with rubber cushion for aerospace applications. It is focused on the clamp product itself and on the way it is inspected, accepted, packaged, stored, and certified.

The document is organized into seven clauses:

• Scope
• Normative references
• Terms and definitions
• Required characteristics, inspection and test methods
• Quality assurance
• Packaging and storage
• Certificate of compliance with the order

Clause 4 is the technical core of the document. Clauses 5 to 7 cover how batches are accepted, how products are protected for delivery, and what document is supplied with the order.

What are the key requirements of SIST EN 3078:2026?

SIST EN 3078:2026 ties the product requirements to inspection methods, so the same document tells users what to check and how to check it. In practice, that helps suppliers prepare the right evidence and helps buyers decide whether a delivery batch is acceptable.

Product characteristics and inspection

Clause 4 and Table 1 list the main characteristics to verify:

• materials
• dimensions and tolerances
• mass
• marking
• surface appearance
• surface treatment

For materials, the document allows chemical analysis or a certificate of compliance for the metal strip, and a certificate of compliance for the cushion. For dimensions, mass, marking, surface appearance and surface treatment, the table also states whether the check applies to samples or to all clamps. This matters because some checks are batch-oriented, while others are applied to every piece.

Table 1 also separates product acceptance from production batch acceptance. That distinction tells the reader whether a result is for an individual item or for lot acceptance.

Test conditions

Clause 4.2 sets the test conditions. Unless otherwise specified, testing is done at 15 °C to 25 °C. Clamp attachment bolts, when used, must meet the stated strength and thread requirements for metric or inch series clamps.

This matters because test results depend on the test setup. Using the specified bolts and temperature makes checks comparable between supplier and user.

Test mandrels and dimensional checks

Clause 4.2.3 defines the mandrels used for testing:

• P, Q and type 1 saddle clamps use a mandrel slightly smaller than the nominal clamp diameter, with the stated roughness and straightness.
• type 2 saddle clamps use a mandrel slightly larger than the nominal clamp diameter, with the stated roughness.

Clause 4.2.4 then explains how to check dimensions with the mandrel and shims. For type 2 saddle clamps, the mounted condition must show no clearance between mandrel and cushion and no significant cushion deformation.

In practice, these checks confirm that the clamp fits and behaves correctly on the intended pipe or bundle size.

Quality assurance and acceptance

Clause 5 requires the manufacturer to be an approved production organization for aerospace products and to have a quality management system, such as EN 9100 or an equivalent accepted aerospace system. For delivery batch acceptance, samples are taken in accordance with ISO 2859-1.

The document sets Acceptable Quality Level (AQL) values for major and minor defects. It also explains that nonconforming parts are rejected, and that minor defects require a procedure from the user’s quality assurance department. This is the part buyers and inspectors use to define incoming inspection and rejection handling.

Packaging, storage and certificate

Clause 6 requires protection against damage, humidity, corrosion, dirt and other harmful attack. Clause 7 requires a certificate of compliance with the order in accordance with EN 10204. That supports traceability and receiving inspection.

What terms does SIST 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; the standard shows type 1 fixed and type 2 sliding versions, retained by two fasteners.
• Production batch - a quantity produced at one time under conditions presumed uniform.
• Acceptable quality level (AQL) - the limit of a satisfactory process average used for sampling inspection.
• Major defect - a defect likely to cause failure or materially reduce usability.
• Minor defect - a defect unlikely to materially reduce usability, or a small departure from specification.

Who uses SIST EN 3078:2026?

SIST EN 3078:2026 is used by aerospace clamp manufacturers, suppliers, purchasers, incoming inspection teams, and quality assurance departments. It is also used by laboratories that perform dimensional checks, material checks, and batch sampling.

In practice, users apply it when designing, making, receiving, or accepting P, Q and saddle clamps for aerospace fluid systems and cable bundle support.

Which standards are used with SIST EN 3078:2026?

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

What does the SIST EN 3078:2026 document contain?

SIST EN 3078:2026 contains the product requirements in Table 1, the test mandrel data in Table 2, and the acceptance sampling rules in Table 3. It also includes Figures 1 to 4, which show the clamp and mandrel arrangements used for dimensional checking.

The body of the document covers inspection methods, test conditions, quality assurance, packaging, storage, and certification. For a reader, that means the document is useful both for product definition and for incoming or outgoing acceptance work.

Its bibliography names EN 9100 as a related aerospace quality management reference.

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
...