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: 15-Nov-2027
• ICS: 49.030.20 - Bolts, screws, studs
• Technical Committee: ASD-STAN - Aerospace
• Drafting Committee: ASD-STAN/D 3/S 2 - Fasteners
• Current Stage: 4060 - Closure of enquiry - Enquiry
• Start Date: 17-Sep-2026
• Completion Date: 17-Sep-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

prEN 3052 is a draft European Standard from CEN for aerospace bolts with a normal hexagonal head, close tolerance normal shank, short thread, in heat and corrosion resisting steel, passivated. It specifies the bolt characteristics for the 1 100 MPa classification at ambient temperature and a maximum service temperature of 425 °C.

What does prEN 3052 specify?

prEN 3052 specifies the characteristics of a specific aerospace bolt type and how it is identified, marked, manufactured and qualified. The document is organized into clauses 1 to 8: scope, normative references, terms and definitions, required characteristics, designation, marking, technical specification, and oversized bolts.

The scope is focused on the bolt itself, with its classification and material/surface condition stated up front. In practice, this is the document a designer, buyer or supplier uses when they need to specify this bolt type unambiguously for aerospace use.

What are the key requirements of prEN 3052?

Geometry, dimensions and tolerances

Clause 4.1 requires the configuration, dimensions and mass to follow Figure 1 and Table 1. Dimensions and tolerances are given in millimetres and apply after surface treatment, while unspecified shape details are left to the manufacturer's discretion.

Clause 4.2 requires form and position tolerances to follow ISO 7913. For practice, this means the bolt is not just sized by thread and length - its geometric accuracy is controlled by referenced aerospace tolerance rules.

Thread, material and surface condition

Clause 4.1 ties the thread dimensions to ISO 3193, and Clause 4.3 requires materials in accordance with TR 3775 for heat and corrosion resisting steel in strength class 1 100 MPa. Clause 4.4 requires surface treatment in accordance with EN 2516.

This matters because the bolt is intended for a controlled aerospace material system, not any generic steel fastener. The document also notes that surface roughness values in micrometres apply before surface treatment, so inspection needs to distinguish base geometry from the finished condition.

Configuration and optional features

Figure 1 shows the bolt configuration, including the head, shank, thread, marking position and optional holes. The figure and Table 1 also support different hole options and length codes.

In practice, the purchaser must specify not only diameter and length, but also whether the bolt is supplied with no locking feature, lockwire, split pin, or both. That choice affects assembly method and how the fastener is retained in service.

Designation and marking

Clause 5 gives the designation structure, using a bolt reference plus codes for hole type, diameter and length. Clause 6 links marking to Table 3 and Figure 1.

This means the product can be ordered and identified in a compact code, and the marking on the part has to reflect the specified diameter range and marking style. For procurement and incoming inspection, this helps match the delivered part to the drawing and order.

Technical specification, approval and qualification

Clause 7 says the technical specification follows ISO 8168 with modifications. It also requires manufacturers to be approved production organizations for aerospace products and to maintain a quality management system such as EN 9100 or an equivalent accepted aerospace system.

Clause 7.3 requires qualification of aerospace standard products through a procedure such as EN 9133, with the specified tests documented unless the customer and supplier agree otherwise. In practice, this is the clause that connects the part standard to supplier control and product qualification.

Oversized bolts

Clause 8 states that oversized bolts are to be in accordance with EN 4016. That gives a clear route when the standard bolt needs the oversized version used in the aerospace system.

What terms does prEN 3052 use?

• Classification - The bolt is classified as 1 100 MPa at ambient temperature and 425 °C, which tells users the intended strength class and temperature capability.
• Passivated - The bolt has a passivated surface treatment, meaning the steel surface is treated for corrosion resistance in accordance with EN 2516.
• Close tolerance normal shank - The shank is manufactured with controlled tolerances so the bolt fits accurately in the assembly.
• MJ threads - The bolt uses the aerospace MJ thread system, with limits and dimensions controlled by ISO 5855-2 and ISO 3193.
• Hole code - The designation uses a hole code to show whether the bolt is for no locking, lockwire, split pin, or both.
• Oversized bolts - These are the related oversize fasteners covered by EN 4016.

Who uses prEN 3052?

prEN 3052 is used by aerospace designers, fastener manufacturers, procurement teams, quality managers and inspection personnel. Designers use it to specify the correct bolt configuration and performance class. Buyers use it to order the right diameter, length and locking option. Manufacturers and quality teams use it for materials control, surface treatment, marking, approval and qualification.

What changed in prEN 3052 from the previous edition?

prEN 3052 will supersede EN 3052:2009. The foreword states three technical changes: Clause 3 was added, Figure 1 was updated, and Clause 7 was editorially revised.

Which standards are used with prEN 3052?

• EN 2424 - sets the aerospace product marking style used for the bolt marking rules.
• EN 2516 - specifies passivation and decontamination requirements for the surface treatment.
• EN 4016 - covers oversized bolts referenced by Clause 8.
• ISO 3193 - gives dimensions for aerospace bolts with MJ threads.
• ISO 3353-1 - covers lead and runout threads for rolled external threads.
• ISO 5855-2 - gives MJ thread limit dimensions for bolts and nuts.
• ISO 7913 - gives tolerances of form and position.
• ISO 8168 - provides the procurement specification framework used in Clause 7.
• TR 3775 - supports the material selection for heat and corrosion resisting steel.
• EN 9100 - is cited as an example of an acceptable aerospace quality management system.
• EN 9133 - is cited as an example of an aerospace product qualification procedure.

What does the prEN 3052 document contain?

The document includes Figure 1 for the bolt configuration, Table 1 for dimensions and mass, Table 2 for hole codes, and Table 3 for marking. It also gives a designation example and notes on optional holes, thread details and length coding. Clause 7 links the product standard to manufacturer approval and qualification testing, so the document is also used for supplier control and conformity assessment. The bibliography points to related aerospace quality and fastening documents.

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
...