prEN 3052

• Abstract:

  This document specifies the characteristics of bolts, normal hexagonal head, close tolerance normal shank, short thread, in heat and corrosion resisting steel, passivated.; Classification: 1 100 MPa 1/ 425 °C2.

• Status: Not Published
• Publication Date: 19-Dec-2027
• ICS: 49.030.20 - Bolts, screws, studs
• Technical Committee: ASD-STAN - Aerospace
• Drafting Committee: ASD-STAN/D 3/S 2 - Fasteners
• Current Stage: 4020 - Submission to enquiry - Enquiry
• Start Date: 25-Jun-2026
• Completion Date: 25-Jun-2026
• Ref Project: oSIST prEN 3052:2026 - Aerospace series - Bolt, normal hexagonal head, close tolerance normal shank, short thread, in heat and corrosion resisting steel, passivated - Classification : 1 100 MPa (at ambient temperature) / 425 °C

• Revises: EN 3052:2009 - Aerospace series - Bolts, normal hexagonal head, close tolerance normal shank, short thread, in heat and corrosion resisting steel, passivated - Classification: 1 100 MPa (at ambient temperature) / 425 °C
• Effective Date: 20-Jan-2026

Overview

prEN 3052 is a draft European standard developed by CEN under the Aerospace series. It specifies the characteristics and requirements for aerospace bolts with a normal hexagonal head, close tolerance normal shank, and short thread, manufactured from heat and corrosion resisting steel and finished through passivation. These bolts are classified by their mechanical properties: a minimum tensile strength of 1 100 MPa at ambient temperature and service capability up to 425 °C. This standard is essential for ensuring high-performance and safety in aerospace assembly applications, providing consistent dimensions, mechanical properties, and surface quality for aerospace fasteners.

Key Topics

• Bolt Characteristics:

  • Normal hexagonal head for standard tool compatibility.
  • Close tolerance normal shank ensuring precise fit in aerospace structures.
  • Short thread design optimized for typical aerospace fastening requirements.
  • Manufactured from heat and corrosion resisting steel to maximize reliability under harsh environments.

• Passivated Surface:

  • Passivation increases resistance to corrosion, essential for aircraft and space applications where environmental factors can affect performance and durability.

• Classification:

  • 1 100 MPa minimum tensile strength at ambient temperature.
  • 425 °C maximum service temperature without compromising performance.

• Compliance Requirements:

  • Conformance with relevant ISO and EN standards for dimensions, tolerances, materials, and marking.
  • Manufacturers must be approved aerospace production organizations with robust quality management systems (e.g., EN 9100).

Applications

The prEN 3052 standard is widely applicable in the aerospace industry for the following reasons:

• Aircraft Assembly: Used extensively in the joining of structural elements, wings, fuselage panels, and sub-systems where secure, high-strength fastening is critical.
• Spacecraft Construction: Well-suited for high-stress and high-temperature environments found in propulsion sections and thermal zones.
• Maintenance, Repair, and Overhaul (MRO): Ensures that replacement bolts maintain the original integrity and safety required by aerospace regulations.
• Other High-Performance Sectors: Applicable to defense, aviation, and precision engineering sectors where similar demands for strength, corrosion resistance, and temperature stability are present.

Related Standards

The prEN 3052 standard references and complements various international aerospace standards to maintain global harmonization and reliability, including:

• EN 2424 - Aerospace series – Marking of aerospace products
• EN 2516 - Passivation of corrosion resisting steels and decontamination of nickel/cobalt base alloys
• EN 4016 - Oversized bolts for aerospace applications
• ISO 3193 - Aeronautic bolts: dimensions and tolerances
• ISO 5855-2 - MJ threads for aerospace bolts and nuts – limit dimensions
• ISO 7913 - Tolerances of form and position for bolts and screws
• ISO 8168 - Procurement specification for bolts made from heat and corrosion resisting steel
• TR 3775 - Materials for bolts and pins in aerospace

Practical Value

Adopting the prEN 3052 standard delivers clear practical benefits, including:

• Enhanced reliability: Ensures that aerospace bolts meet stringent mechanical and environmental criteria.
• Interchangeability: Standardization enables consistent sourcing and replacement, streamlining logistics and reducing operational risks.
• Regulatory compliance: Facilitates alignment with European and international aerospace regulations, supporting safety and certification processes.
• Quality assurance: Requires industry-standard quality management systems and established qualification procedures for manufacturers, guaranteeing consistent product performance.

By specifying heat and corrosion resistant, passivated aerospace bolts, prEN 3052 supports robust, high-quality assembly in demanding aerospace and aviation environments. For further reference, related standards like EN 9100 (quality management) and EN 9133 (product qualification) underpin confidence in bolt manufacture and use.

SLOVENSKI STANDARD
01-september-2026
Aeronavtika - Sorniki, normalna šestroba glava, ozka toleranca, kratek navoj, iz
toplotno in korozijsko odpornega jekla, pasivirani - Klasifikacija: 1100 MPa (pri
temperaturi okolice)/425 °C
Aerospace series - Bolt, normal hexagonal head, close tolerance normal shank, short
thread, in heat and corrosion resisting steel, passivated - Classification : 1 100 MPa (at
ambient temperature) / 425 °C
Luft- und Raumfahrt - Sechskant-Passschraube, kurzes Gewinde, aus
korrosionsbeständigem und hochwarmfestem Stahl, passiviert - Klasse : 1 100 MPa (bei
Raumtemperatur) / 425 °C
Ta slovenski standard je istoveten z: prEN 3052
ICS:
49.025.10 Jekla Steels
49.030.20 Sorniki, vijaki, stebelni vijaki Bolts, screws, studs
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
EUROPEAN STANDARD
NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2026
ICS 49.030.20 Will supersede EN 3052:2009
English Version
Aerospace series - Bolt, normal hexagonal head, close
tolerance normal shank, short thread, in heat and
corrosion resisting steel, passivated - Classification : 1 100
MPa (at ambient temperature) / 425 °C
Luft- und Raumfahrt - Sechskant-Passschraube, kurzes
Gewinde, aus korrosionsbeständigem und
hochwarmfestem Stahl, passiviert - Klasse : 1 100 MPa
(bei Raumtemperatur) / 425 °C
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
© 2026 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 3052:2026 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
4 Required characteristics . 5
4.1 Configuration — Dimensions — Mass . 5
4.2 Tolerance of form and position . 5
4.3 Materials . 5
4.4 Surface treatment . 5
5 Designation . 9
6 Marking . 9
7 Technical specification . 9
7.1 General. 9
7.2 Approval of manufacturers . 9
7.3 Qualification of products . 9
8 Oversized bolts . 10
Bibliography . 11

European foreword
This document (prEN 3052:2026) 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 document is currently submitted to the CEN Enquiry.
This document will supersede EN 3052:2009.
This document includes the following significant technical changes with respect to EN 3052:2009.
— Clause 3, “Terms and Definitions”, added;
— Figure 1 updated;
— Clause 7, “Technical specification”, editorially revised.
1 Scope
This document specifies the characteristics of bolts, normal hexagonal head, close tolerance normal
shank, short thread, in heat and corrosion resisting steel, passivated.
1 2
Classification: 1 100 MPa / 425 °C .
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
...