EN 3323:2009
(Main)Aerospace series - Bolts with double hexagon head, relieved shank. long thread, - In heat resisting steel FE-PM 38 (FV 535) - Classification: 1 000 MPa/550 °C
Aerospace series - Bolts with double hexagon head, relieved shank. long thread, - In heat resisting steel FE-PM 38 (FV 535) - Classification: 1 000 MPa/550 °C
This standard specifies the characteristics of double hexagon head bolts with relieved shank and long thread in heat resisting steel FM-PM 38, tensile strength class 1 000 MPa at room temperature. The maximum test temperature of the material is 550 °C.
These bolts are to be used in aerospace fastening systems, of parts made in titanium, mainly stressed in tension.
Luft- und Raumfahrt - Zwölfkantschrauben, Dünnschaft, langes Gewinde - Aus hochwarmfestem Stahl FE-PM 38 (FV 535) - Klasse: 1 000 MPa/550 °C
Diese Norm legt die Eigenschaften von Zwölfkantschrauben mit Dünnschaft und langem Gewinde aus hochwarmfesten
Stahl FM-PM 38, Zugfestigkeitsklasse 1 000 MPa bei Umgebungstemperatur fest. Die Höchstprüftemperatur
des Materials beträgt 550 °C.
Diese Schrauben werden in der Luft- und Raumfahrt in Befestigungssystemen von aus Titan hergestellten
Teilen angewendet, die hauptsächlich auf Zugfestigkeit beansprucht werden.
Série aérospatiale - Vis à tête bihexagonale, à tige réduite, à filetage long, en acier résistant à chaud FE-PM38 (FV535) - Classification : 1 000 MPa/550 °C
Aeronavtika - Sorniki z dvojno šestrobo glavo, tanko steblo, dolg navoj - iz toplotnoodpornega jekla FE-PM 38 (FV 535) - Klasifikacija: 1000 MPa/550 °C
General Information
- Status
- Published
- Publication Date
- 10-Feb-2009
- Withdrawal Date
- 30-Aug-2009
- Technical Committee
- ASD-STAN - Aerospace
- Drafting Committee
- ASD-STAN/D 3 - Mechanical
- Current Stage
- 9093 - Decision to confirm - Review Enquiry
- Start Date
- 21-Jan-2025
- Completion Date
- 11-Feb-2026
Relations
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
Overview
EN 3323:2009 is a CEN aerospace series standard that defines the characteristics of bolts with double hexagon head, relieved shank and long thread manufactured in heat‑resisting steel FE‑PM 38 (FV 535). It covers bolts classified at tensile strength class 1 000 MPa (room temperature) with a maximum material test temperature of 550 °C. These fasteners are intended for aerospace fastening systems, particularly for joining titanium parts that are mainly stressed in tension.
Key topics and requirements
- Configuration, dimensions and tolerances: Bolt geometry, double‑hexagon drive profile and dimensional tolerances are specified and presented in the standard’s figures and tables.
- Threading: Long thread and lead/runout requirements reference aerospace thread practices (rolled external threads).
- Surface roughness: Surface finish requirements are defined in the graphical configuration and related notes.
- Material: Material must be heat‑resisting steel FE‑PM 38 in accordance with EN 2493 (bars), meeting Rm range consistent with the 1 000 MPa class.
- Temperature rating: Maximum test temperature for the material is 550 °C - relevant for high‑temperature aerospace applications.
- Surface treatment: None - the standard specifies no surface coating as part of the baseline requirement.
- Marking and designation: Marking follows EN 2424 (category A) and the standard defines the designation format (EN number / diameter code / length code).
- Technical specification: References EN 3302 for technical specification and testing requirements.
Applications and typical users
- Applications:
- High‑temperature aerospace structures and engine components where titanium and heat‑resistant steels are combined.
- Tension‑loaded joints in airframes, pylons, hot structures and assemblies exposed to elevated temperatures up to the material test limit.
- Who uses the standard:
- Aerospace fastener manufacturers and heat‑treat shops producing FE‑PM 38 bolts.
- Aircraft designers and structural engineers specifying high‑strength, high‑temperature fasteners.
- Procurement, quality assurance and inspection teams ensuring conformity for aerospace parts.
- Maintenance, repair and overhaul (MRO) organizations replacing certified fasteners.
Related standards
- EN 2493 - Heat resisting steel FE‑PM 38 (bars)
- EN 2424 - Marking of aerospace products
- EN 3302 - Technical specification for similar heat‑resisting bolts
- ISO 4095 - Bihexagonal drives (wrenching configuration)
- ISO 3353‑1, ISO 5855‑1/2 - Thread and MJ thread general requirements
EN 3323:2009 provides a clear specification for high‑strength, heat‑resistant double‑hexagon bolts used in critical aerospace tension joints, enabling consistent manufacture, inspection and procurement across the industry.
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Frequently Asked Questions
EN 3323:2009 is a standard published by the European Committee for Standardization (CEN). Its full title is "Aerospace series - Bolts with double hexagon head, relieved shank. long thread, - In heat resisting steel FE-PM 38 (FV 535) - Classification: 1 000 MPa/550 °C". This standard covers: This standard specifies the characteristics of double hexagon head bolts with relieved shank and long thread in heat resisting steel FM-PM 38, tensile strength class 1 000 MPa at room temperature. The maximum test temperature of the material is 550 °C. These bolts are to be used in aerospace fastening systems, of parts made in titanium, mainly stressed in tension.
This standard specifies the characteristics of double hexagon head bolts with relieved shank and long thread in heat resisting steel FM-PM 38, tensile strength class 1 000 MPa at room temperature. The maximum test temperature of the material is 550 °C. These bolts are to be used in aerospace fastening systems, of parts made in titanium, mainly stressed in tension.
EN 3323:2009 is classified under the following ICS (International Classification for Standards) categories: 49.030.20 - Bolts, screws, studs. The ICS classification helps identify the subject area and facilitates finding related standards.
EN 3323:2009 has the following relationships with other standards: It is inter standard links to EN 13848-1:2003+A1:2008, EN 840-6:2004+A1:2008, EN 14035-19:2003, EN 2424:2008, EN 3302:2017. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
EN 3323:2009 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Aeronavtika - Sorniki z dvojno šestrobo glavo, tanko steblo, dolg navoj - iz toplotnoodpornega jekla FE-PM 38 (FV 535) - Klasifikacija: 1000 MPa/550 °CLuft- und Raumfahrt - Zwölfkantschrauben, Dünnschaft, langes Gewinde, - Aus hochwarmfestem Stahl FE-PM 38 (FV 535) - Klasse: 1 000 MPa/550 °CSérie aérospatiale - Vis à tête bihexagonale, à tige réduite, à filetage long, en acier résistant à chaud FE-PM38 (FV535) - Classification : 1 000 MPa/550 °CAerospace series - Bolts with double hexagon head, relieved shank, long thread - In heat resisting steel FE-PM 38 (FV 535) - Classification: 1 000 MPa/550 °C49.030.20Sorniki, vijaki, stebelni vijakiBolts, screws, studsICS:Ta slovenski standard je istoveten z:EN 3323:2009SIST EN 3323:2009en01-maj-2009SIST EN 3323:2009SLOVENSKI
STANDARD
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 3323
February 2009 ICS 49.030.20 English Version
Aerospace series - Bolts with double hexagon head, relieved shank long thread, - In heat resisting steel FE-PM 38 (FV 535) -Classification: 1 000 MPa/550 °C
Série aérospatiale - Vis à tête bihexagonale, à tige réduite, à filetage long, en acier résistant à chaud FE-PM38 (FV535) - Classification : 1 000 MPa/550 °C
Luft- und Raumfahrt - Zwölfkantschrauben, Dünnschaft, langes Gewinde, - Aus hochwarmfestem Stahl FE-PM 38 (FV 535) - Klasse: 1 000 MPa/550 °C This European Standard was approved by CEN on 2 August 2008.
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 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 Management Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre:
Avenue Marnix 17,
B-1000 Brussels © 2009 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 3323:2009: ESIST EN 3323:2009
These bolts are to be used in aerospace fastening systems, of parts made in titanium, mainly stressed in tension.
2 Normative references EN 2424
Aerospace series — Marking of aerospace products1
EN 2493
Aerospace series — Heat resisting steel FE-PM 38 — 1 000 MPa ≤ Rm ≤ 1140 MPa — Bars2
EN 3302 Aerospace series - Bolts in heat resisting steel FE-PM1708 (FV535) - Classification: 1 000 MPa/550 °C - Technical specification1 ISO 3353-1 Aerospace — Lead and runout threads — Part 1: Rolled external threads ISO 4095 Aerospace — Bihexagonal drives — Wrenching configuration — Metric series ISO 5855-1 Aerospace — MJ Threads — Part 1: General requirements ISO 5855-2 Aerospace — MJ Threads — Part 2: Limit dimensions for bolts and nuts
1 Published as ASD standard at the date of publication of this standard. 2 Published as ASD Prestandard at the date of publication of this standard. SIST EN 3323:2009
3 Required characteristics 3.1 Configuration – Dimensions – Tolerances The configuration shall be in accordance with the figure. Dimensions and tolerances shall conform to the values shown in the figure and in Tables 1 and 2. 3.2 Surface roughness See the figure. 3.3 Material Heat resisting steel FM-PM 38 to EN 2493. 3.4 Surface treatment None.
Key 1 Pi
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