EN 4137:2009
(Main)Aerospace series - Bolts, normal bi-hexagonal head, stepped shank, long thread, in titanium alloy, anodized, MoS2 lubricated - Classification: 1 100 MPa (at ambient temperature) / 315 °C
Aerospace series - Bolts, normal bi-hexagonal head, stepped shank, long thread, in titanium alloy, anodized, MoS2 lubricated - Classification: 1 100 MPa (at ambient temperature) / 315 °C
This standard specifies the characteristics of bolts, normal bi-hexagonal head, stepped shank, long thread, in titanium alloy, anodized, MoS2 lubrificated.
Classification: 1 100 MPa ) / 315 °C )
Luft- und Raumfahrt - Zwölfkantschrauben, Dünnschaft, langes Gewinde, aus Titanlegierung, anodisiert, MoS2-geschmiert - Klasse: 1 100 MPa (bei Raumtemperatur) / 315 °C
Diese Norm legt die Eigenschaften für Zwölfkantschrauben, Dünnschaft, langes Gewinde, aus Titanlegierung,
anodisiert, MoS2-geschmiert, fest.
Klasse: 1 100 MPa1)/315 °C2)
Série aérospatiale - Vis à tête bihexagonale normale, à tige dégagée, filetage long, en alliage de titane, anodisées, lubrifiées MoS2 - Classification : 1 100 MPa (à température ambiante) / 315 °C
Aeronavtika - Sorniki, normalna dvanajstroba glava, tanko steblo, dolg navoj, iz titanove zlitine, anodizirani, namazani z MoS2 - Klasifikacija: 1100 MPa (pri temperaturi okolice)/315 °C
General Information
- Status
- Published
- Publication Date
- 30-Jun-2009
- Withdrawal Date
- 30-Jan-2010
- 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
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
Overview
EN 4137:2009 is a CEN aerospace standard that specifies the required characteristics for titanium alloy bolts with a normal bi‑hexagonal head, stepped shank and long thread. The standard covers material classification, configuration, tolerances, surface treatment and identification for use in aerospace fastenings. Bolts covered by EN 4137 are anodized and MoS2‑lubricated, with a material strength classification of 1100 MPa (ambient) and a maximum service temperature of 315 °C as determined by the surface treatment.
Key Topics
- Configuration, dimensions and masses: Dimensions and tolerances are expressed in millimetres and apply after anodizing but before lubricating (see figure and tables in the standard).
- Material: Titanium alloy specified via ASD Technical Report TR 3775, classified for 1100 MPa tensile strength at ambient temperature.
- Surface treatment: Anodizing plus molybdenum disulphide (MoS2) lubrication. EN 2491 provides guidance on MoS2 coating methods; typical coating thickness is specified in the standard (5 µm to 10 µm application range).
- Tolerances of form and position: Requirements reference ISO 7913 to ensure consistent geometric control for aerospace bolts.
- Designation and marking: Standardised designation format (including standard number, diameter and length codes) and marking per EN 2424 for traceability.
- Technical procurement: ISO 9152 is used as the technical procurement base with specified exceptions; manufacturer approval and qualification references point to EN 9100 and EN 9133.
Applications
EN 4137 bolts are intended for aerospace structures and systems where high strength, corrosion resistance and controlled friction management are required. Typical practical values and applications include:
- High‑strength fastenings in airframe assemblies where weight savings and fatigue performance benefit from titanium alloy hardware.
- Environments requiring low friction and reliable preload: MoS2 lubrication reduces galling and ensures repeatable installation torque.
- Elevated temperature service up to the limit defined by the surface treatment (classification: 315 °C maximum without permanent change).
Benefits for engineers and procurement teams:
- Consistent interchangeability and traceability through standard designation and marking.
- Reduced risk of galling and torque variability due to specified MoS2 lubrication and anodizing.
- Clear reference to qualification and quality systems suited to aerospace supply chains.
Related Standards
- EN 2424 - Marking of aerospace products
- EN 2491 - MoS2 dry lubricants - Coating methods
- EN 9100 / EN 9133 - Aerospace quality system and qualification
- ISO 3353‑1, ISO 4095, ISO 5855‑2, ISO 7913, ISO 9152 - Thread, drive and procurement technical references
- TR 3775, TR 4070 - ASD technical reports referenced for materials and commercial MoS2 products
For specification, design and procurement, reference EN 4137:2009 together with the listed normative documents to ensure compliant selection and installation of titanium bi‑hexagonal head bolts in aerospace applications.
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Frequently Asked Questions
EN 4137:2009 is a standard published by the European Committee for Standardization (CEN). Its full title is "Aerospace series - Bolts, normal bi-hexagonal head, stepped shank, long thread, in titanium alloy, anodized, MoS2 lubricated - Classification: 1 100 MPa (at ambient temperature) / 315 °C". This standard covers: This standard specifies the characteristics of bolts, normal bi-hexagonal head, stepped shank, long thread, in titanium alloy, anodized, MoS2 lubrificated. Classification: 1 100 MPa ) / 315 °C )
This standard specifies the characteristics of bolts, normal bi-hexagonal head, stepped shank, long thread, in titanium alloy, anodized, MoS2 lubrificated. Classification: 1 100 MPa ) / 315 °C )
EN 4137:2009 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 4137:2009 has the following relationships with other standards: It is inter standard links to EN 9100:2018, EN 840-6:2004+A1:2008, EN 2491:2011, EN 14460:2006, EN 14035-19:2003, EN 2424:2008, EN 9133:2018. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
EN 4137:2009 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, normalna dvanajstroba glava, tanko steblo, dolg navoj, iz titanove zlitine, anodizirani, namazani z MoS2 - Klasifikacija: 1100 MPa (pri temperaturi okolice)/315 °CLuft- und Raumfahrt - Zwölfkantschrauben, Dünnschaft, langes Gewinde, aus Titanlegierung, anodisiert, MoS2-geschmiert - Klasse: 1100 MPa (bei Raumtemperatur)/315 °CSérie aérospatiale - Vis à tête bihexagonale normale, à tige dégagée, filetage long, en alliage de titane, anodisées, lubrifiées MoS2 - Classification: 1100 MPa (à température ambiante)/315 °CAerospace series - Bolts, normal bi-hexagonal head, stepped shank, long thread, in titanium alloy, anodized, MoS2 lubricated - Classification: 1100 MPa (at ambient temperature)/315 °C49.030.20Sorniki, vijaki, stebelni vijakiBolts, screws, studsICS:Ta slovenski standard je istoveten z:EN 4137:2009SIST EN 4137:2009en,de01-september-2009SIST EN 4137:2009SLOVENSKI
STANDARD
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 4137
July 2009 ICS 49.030.20 English Version
Aerospace series - Bolts, normal bi-hexagonal head, stepped shank, long thread, in titanium alloy, anodized, MoS2 lubricated - Classification: 1 100 MPa (at ambient temperature) / 315 °C
Série aérospatiale - Vis à tête bihexagonale normale, à tige dégagée, filetage long, en alliage de titane, anodisées, lubrifiées MoS2 - Classification : 1 100 MPa (à température ambiante) / 315 °C
Luft- und Raumfahrt - Zwölfkantschrauben, Dünnschaft, langes Gewinde, aus Titanlegierung, anodisiert, MoS2-geschmiert - Klasse: 1 100 MPa (bei Raumtemperatur) / 315 °C This European Standard was approved by CEN on 6 June 2009.
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 4137:2009: ESIST EN 4137:2009
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