SIST EN 4137:2009

Aerospace series - Bolts, normal bi-hexagonal head, stepped shank, long thread, in titanium alloy, anodized, MoS2 lubricated - Classification: 1100 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: 1100 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: 1100 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: 17-Aug-2009
• ICS: 49.030.20 - Bolts, screws, studs
• Technical Committee: I13 - Imaginarni 13
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 13-Jul-2009
• Due Date: 17-Sep-2009
• Completion Date: 18-Aug-2009
• Ref Project: EN 4137:2009 - 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

Relations

• Refers: SIST EN 14035-19:2003 - Fireworks - Part 19: Hand-held sparklers - Specification and test methods
• Effective Date: 28-Jan-2026
• Refers: SIST EN 9100:2018 - Quality Management Systems - Requirements for Aviation, Space and Defense Organizations
• Effective Date: 28-Jan-2026
• Refers: SIST EN 9133:2018 - Aerospace series - Quality Management Systems - Qualification Procedure for Aerospace Standard Products
• Effective Date: 28-Jan-2026
• Refers: SIST EN 2491:2011 - Aerospace series - Molybdenum disulphide dry lubricants - Coating methods
• Effective Date: 28-Jan-2026
• Refers: SIST EN 840-6:2004+A1:2008 - Mobile waste containers - Part 6: Safety and health requirements
• Effective Date: 28-Jan-2026
• Refers: SIST EN 2424:2008 - Aerospace series - Marking of aerospace products
• Effective Date: 28-Jan-2026
• Refers: SIST EN 14460:2006 - Explosion resistant equipment
• Effective Date: 28-Jan-2026

Overview

SIST EN 4137:2009 is a European standard developed by the Slovenski inštitut za standardizacijo (SIST) that specifies the characteristics of aerospace bolts featuring a normal bi-hexagonal head, stepped shank, and long thread. These bolts are manufactured from titanium alloy, anodized for corrosion resistance, and lubricated with molybdenum disulfide (MoS2) for reduced friction. Designed for high-performance applications, the bolts are classified for a minimum tensile strength of 1100 MPa at ambient temperature and operational integrity up to 315 °C, making them suitable for demanding aerospace environments.

Key Topics

• Aerospace-Grade Materials: The standard covers bolts made from titanium alloy, providing high strength-to-weight ratio, corrosion resistance, and suitability for high-temperature operation.
• Head and Shank Design: The bolts have a normal bi-hexagonal (12-point) head for reliable wrenching and a stepped shank with a long MJ (metric) thread, optimizing load transfer and minimizing risk of thread stripping in critical assemblies.
• Surface Treatments: Anodization enhances corrosion protection, while MoS2 lubrication reduces assembly torque and wear, ensuring longevity and reliable performance.
• Mechanical Classification: Bolts are rated to 1100 MPa minimum tensile strength and can operate in environments up to 315 °C without loss of critical properties, aligning with stringent aerospace safety requirements.
• Marking and Traceability: The standard mandates marking methods in accordance with EN 2424 to ensure traceability, product identification, and quality assurance across supply chains.

Applications

SIST EN 4137:2009 bolts are widely used in the aerospace industry, particularly where high strength, low weight, and high-temperature resistance are essential. Typical applications include:

• Aircraft Engine Assemblies: Suitable for structural joints and engine mounts exposed to elevated temperatures.
• Airframe Construction: Used in critical load-bearing components where reliability and fatigue resistance are mandatory.
• Spacecraft Hardware: Leveraged in satellite and launcher structures requiring minimal mass with sustained mechanical performance.
• Maintenance and Repair: Standardization of dimensions and properties ensures interchangeability for replacements and repairs in aerospace fleets.

Utilizing these standardized bolts helps manufacturers and maintenance providers ensure compatibility, safety, and compliance with international aerospace quality management systems.

Related Standards

For comprehensive implementation, system designers and procurement specialists should be aware of related and referenced standards that support and supplement SIST EN 4137:2009:

• EN 2424: Marking of aerospace products, defining product identification requirements.
• EN 2491: Procedures for applying MoS2 dry lubricant coatings.
• EN 9100: Aerospace quality management systems, based on ISO 9001.
• EN 9133: Qualification procedures for aerospace standard parts.
• ISO 3353-1: Specifications for rolled external threads in aerospace components.
• ISO 4095: Bihexagonal wrenching configuration in metric series bolts.
• ISO 5855-2: Limit dimensions for MJ threads in bolts and nuts.
• ISO 7913: Tolerances for aerospace bolts and screws.
• ISO 9152: General procurement specification for titanium alloy bolts, strength class 1100 MPa.
• TR 3775 & TR 4070: Technical reports covering aerospace bolt materials and MoS2 coatings.

Leveraging these standards ensures full compliance, consistent product performance, and quality assurance within the aerospace supply chain.

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Keywords: aerospace bolts, bi-hexagonal head, titanium alloy bolts, MoS2 lubricated bolts, high-strength bolts, anodized bolts, aerospace fasteners standard, SIST EN 4137, 1100 MPa bolts, 315°C bolts

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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