SIST EN 4322:2005

Aerospace series - Bolts, double hexagon head with lockwire holes, relieved shank, long thread, in titanium alloy TI-P64001, anodized, MoS2 coated - Strength class: 1 100 MPa (at ambient temperature)

This standard specifies the characteristics of double hexagon headed bolts with lockwire holes, relieved shank and long thread, in TI-P64001, anodized, MoS2 coated, for aerospace applications.
Strength class: 1 100 MPa  )

Luft- und Raumfahrt - Zwölfkantschrauben, mit Löchern für Sicherungsdraht, Dünnschaft, langes Gewinde, aus Titanlegierung TI-P64001, anodisiert, MoS2-beschichtet - Festigkeitsklasse: 1 100 MPa (bei Raumtemperatur)

Série aérospatiale - Vis a tete bihexagonale avec trous de fil frein, fut dégagé, filetage long, en alliage de titane TI-P64001, anodisées, revetues MoS2 - Classe de résistance : 1 100 MPa (a température ambiante)

Aerospace series - Bolts, double hexagon head with lockwire holes, relieved shank, long thread, in titanium alloy TI-P64001, anodized, MoS2 coated - Strength class: 1 100 MPa (at ambient temperature)

General Information

• Status: Published
• Publication Date: 31-May-2005
• ICS: 49.030.20 - Bolts, screws, studs
• Technical Committee: SS SPL - Technical Board for the general field
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Jun-2005
• Due Date: 01-Jun-2005
• Completion Date: 01-Jun-2005
• Ref Project: EN 4322:2004 - Aerospace series - Bolts, double hexagon head with lockwire holes, relieved shank, long thread, in titanium alloy TI-P64001, anodized, MoS2 coated - Strength class: 1 100 MPa (at ambient temperature)

Relations

• Replaces: SIST EN 4322:2004 - Aerospace series - Bolts, double hexagon head with lockwire holes, relieved shank, long thread, in titanium alloy TI-P64001, anodized, MoS2 coated - Strength class:100 MPa (at ambient temperature)
• Effective Date: 01-Jun-2005

Overview

SIST EN 4322:2005 is a European standard developed by CEN that specifies the requirements for aerospace-grade bolts. These bolts feature a double hexagon head with lockwire holes, a relieved shank, and a long thread. Made from the titanium alloy TI-P64001, these fasteners are anodized and coated with molybdenum disulphide (MoS2) to ensure enhanced durability and corrosion resistance. Classified under the strength class 1100 MPa at ambient temperature, these bolts are designed to meet the demanding mechanical and environmental conditions typical of aerospace applications.

Key Topics

• Bolt Configuration & Dimensions
  Bolts conform to precise dimensions, tolerances, and masses as outlined in the standard. Measurements apply after anodizing but before MoS2 coating, ensuring consistent physical properties.

• Material Specifications
  The titanium alloy TI-P64001 is specified following EN 3813, ensuring the bolts deliver high strength, lightweight properties, and corrosion resistance crucial for aerospace structures.

• Surface Treatment
  Anodizing combined with a molybdenum disulphide dry lubricant coating (per EN 2491) improves corrosion resistance and reduces friction, essential for secure tightening and long-term reliability.

• Design Features

  • Double hexagon heads enable effective wrenching and torque application.
  • Lockwire holes provide safety by preventing bolt rotation under vibration or stress via locking wires.
  • Relieved shank reduces stress concentration and weight.
  • Long thread length offers flexibility in assembly and secure fastening.

• Strength Class
  Rated at a minimum tensile strength of 1100 MPa at ambient temperature, these bolts meet stringent aerospace structural requirements.

• Designation and Marking
  Bolts are designated using a coding system specifying the standard number, thread size, and length. Marking follows EN 2424, facilitating traceability and quality assurance.

Applications

SIST EN 4322:2005 bolts are primarily used in aerospace manufacturing and maintenance, where mechanical integrity, corrosion resistance, and precise fastening are critical. Typical applications include:

• Aircraft structural assemblies requiring high-strength fasteners.
• Components exposed to high stress and vibration, where secure locking is vital.
• Situations demanding lightweight fasteners to enhance fuel efficiency and payload capacities.
• Assemblies exposed to environmental factors where anodized and lubricated coatings extend service life.

The combination of titanium alloy and specialized coatings makes these bolts ideal for aerospace engineers, maintenance technicians, and manufacturers striving to meet international safety and performance standards.

Related Standards

• ISO 3353-1: Aerospace lead and runout threads rolled external threads.
• ISO 4095: Bihexagonal drives wrenching configuration - metric series.
• ISO 5855-2: MJ thread limit dimensions for bolts and nuts.
• EN 2424: Marking of aerospace products.
• EN 2491: Molybdenum disulphide dry lubricants coating methods.
• EN 3813: Titanium alloy TI-P64001 - annealed bar and wire for forged fasteners.
• EN 3818: Aerospace bolts in titanium alloy TI-P64001 with strength class 1100 MPa.

These complementary standards ensure compatibility, safety, and quality in aerospace fastener design and production.

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SIST EN 4322:2005 supports aerospace industry stakeholders by providing a comprehensive specification for titanium alloy bolts optimized for strength, fastening security, and longevity under demanding operational environments. Utilizing these standardized fasteners enhances safety, maintenance efficiency, and regulatory compliance in aerospace projects.

Standards Content (Sample)

SLOVENSKI STANDARD
01-junij-2005
1DGRPHãþD
SIST EN 4322:2004
Aerospace series - Bolts, double hexagon head with lockwire holes, relieved
shank, long thread, in titanium alloy TI-P64001, anodized, MoS2 coated - Strength
class: 1 100 MPa (at ambient temperature)
Aerospace series - Bolts, double hexagon head with lockwire holes, relieved shank, long
thread, in titanium alloy TI-P64001, anodized, MoS2 coated - Strength class: 1 100 MPa
(at ambient temperature)
Luft- und Raumfahrt - Zwölfkantschrauben, mit Löchern für Sicherungsdraht, Dünnschaft,
langes Gewinde, aus Titanlegierung TI-P64001, anodisiert, MoS2-beschichtet -
Festigkeitsklasse: 1 100 MPa (bei Raumtemperatur)
Série aérospatiale - Vis a tete bihexagonale avec trous de fil frein, fut dégagé, filetage
long, en alliage de titane TI-P64001, anodisées, revetues MoS2 - Classe de résistance :
1 100 MPa (a température ambiante)
Ta slovenski standard je istoveten z: EN 4322:2004
ICS:
49.030.20 Sorniki, vijaki, stebelni vijaki Bolts, screws, studs
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 4322
NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2004
ICS 49.030.20     Supersedes EN 4322:2003
English version
Aerospace series - Bolts, double hexagon head with lockwire
holes, relieved shank, long thread, in titanium alloy TI-P64001,
anodized, MoS2 coated - Strength class: 1 100 MPa (at ambient
temperature)
Série aérospatiale - Vis à tête bihexagonale avec trous de Luft- und Raumfahrt - Zwölfkantschrauben mit Löcher für
fil frein, fût dégagé, filetage long, en alliage de titane TI- Sicherungsdraft, Dünnschaft, langes Gewinde, aus
P64001, anodisées, revêtues MoS2 - Classe de résistance Titanlegierung TI-P64001, anodisiert, MoS2 beschichtet -
: 1 100 MPa (à température ambiante) Festigkeitsklasse: 1 100 MPa (bei Raumtemperatur)
This European Standard was approved by CEN on 11 September 2003.

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 Central Secretariat 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 Central Secretariat has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,
Slovenia, Spain, Sweden, Switzerland and United Kingdom.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2004 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 4322:2004: E
worldwide for CEN national Members.

Contents                                                                        Page

Foreword.3
1 Scope .4
2 Normative references .4
3 Required characteristics.4
4 Designation .9
5 Marking .9
6 Technical specification .9
Foreword
This document (EN 4322:2004) has been prepared by the European Association of Aerospace
Manufacturers - Standardization (AECMA-STAN).
After enquiries and votes carried out in accordance with the rules of this Association, this Standard has
received the approval of the National Associations and the Official Services of the member countries of
AECMA, 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 May 2005, and conflicting national standards shall be withdrawn at
the latest by May 2005.
This document supersedes EN 4322:2003.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland
and the United Kingdom.
1 Scope
This standard specifies the characteristics of double hexagon headed bolts with lockwire holes, relieved
shank and long thread, in TI-P64001, anodized, MoS coated, for aerospace applications.
1)
Strength class: 1 100 MPa
2 Normative references
The following referenced documents are indispensable for the application 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.
ISO 3353-1, Aerospace – Lead and runout threads – Part 1: Rolled external threads
ISO 4095, Aerospace – Bihexagonal drives – Wrenching configuration – Metric series
ISO 5855-2, Aerospace – MJ threads – Part 2: Limit dimensions for bolts and nuts
EN 2424, Aerospace series – Marking of aerospace products
EN 2491, Aerospace series – Molybdenum disulphide dry lubricants – Coating methods
EN 3813, Aerospace series – Titanium alloy TI-P64001 – Annealed – Bar and wire for forged fasteners –
2)
D ≤ 25 mm
e
EN 3818, Aerospace series – Bolts, MJ threads, in titanium alloy TI-P64001 – Strength class: 1 100 MPa
(at ambient temperature) – Technical specification
3 Required characteristics
3.1 Configuration – Dimensions – Tolerances – Masses
See Figure 1 and Tables 1 and 2.
Dimensions and tolerances are in millimetres. They apply after anodizing but before MoS coating.
3.2 Materials
EN 3813
3.3 Surface treatment
EN 2491

1) Minimum t
...