EN 4129:2009
(Main)Aerospace series - Bolts, normal hexagonal head, coarse tolerance normal shank, medium length thread, in alloy steel, cadmium plated - Classification: 1 100 MPa (at ambient temperature) / 235 °C
Aerospace series - Bolts, normal hexagonal head, coarse tolerance normal shank, medium length thread, in alloy steel, cadmium plated - Classification: 1 100 MPa (at ambient temperature) / 235 °C
This standard specifies the characteristics of bolts, normal hexagonal head, coarse tolerance normal shank,
medium length thread, in alloy steel, cadmium plated.
Classification: 1 100 MPa 1)/ 235 °C 2)
Luft- und Raumfahrt - Sechskantschrauben, mittlere Gewindelänge, aus legiertem Stahl, verkadmet - Klasse : 1 100 MPa (bei Raumtemperatur) / 235 °C
Série aérospatiale - Vis à tête hexagonale normale, tige normale à tolérance large, filetage moyen, en acier allié, cadmiées - Classification : 1 100 MPa (à température ambiante) / 235 °C
Aeronavtika - Sorniki, normalna šestroba glava, široka toleranca, srednja navojna dolžina, iz legiranega jekla, prevlečeni s kadmijem - Klasifikacija: 1100 MPa (pri temperaturi okolice)/235 °C
Ta standard opredeljuje značilnosti vijakov, z normalno šestrobo glavo, široko toleranco, srednjo navojno dolžino iz legiranega jekla in kadmiranih.
General Information
- Status
- Published
- Publication Date
- 14-Apr-2009
- Withdrawal Date
- 30-Oct-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
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 20-Mar-2010
Overview
EN 4129:2009 is a CEN (ASD-STAN) aerospace standard specifying the characteristics of bolts with a normal hexagonal head, coarse tolerance normal shank and medium length thread, made from alloy steel and cadmium plated. It defines mechanical classification 1 100 MPa (minimum tensile strength at ambient temperature) and a service temperature limit of 235 °C (maximum that the bolt can withstand without permanent change; surface treatment determines the limit). This standard is intended for aerospace applications where high-strength, cadmium-plated hex bolts are required.
Key topics and technical requirements
- Configuration, dimensions and tolerances
- Dimensions in millimetres in accordance with ISO 3193; applies after surface treatment.
- Medium length MJ threads and diameter/length coding system are defined (see Table 1 in the standard).
- Materials
- Alloy steels conforming to EN 2137, EN 2442 or TR 3775 with classification 1 100 MPa.
- Surface treatment
- Cadmium plating requirements per EN 2133.
- Plating thickness: 8 µm to 14 µm on all surfaces that can be contacted by a 20 mm diameter ball; continuous cadmium plating on other surfaces (black cadmium option: code B).
- Surface treatment determines the maximum usable temperature (235 °C noted).
- Form and position tolerances
- Specified by ISO 7913.
- Marking and designation
- Marking per EN 2424; example designation format: EN4129H050040B (standard number + diameter code + length code + black plating code).
- Optional hole codes for lockwire/split pin retention are provided.
- Quality and procurement
- Technical procurement references ISO 7689; manufacturer approval and qualification follow EN 9100 and EN 9133 respectively.
Applications and who uses this standard
- Typical use: airframe structural fasteners, secondary structure assemblies, control systems and other aerospace components requiring high-strength, corrosion-resistant bolts.
- Primary users:
- Aerospace fastener manufacturers and heat-treatment shops
- Quality assurance and procurement teams specifying bolt requirements
- Design, structural and maintenance engineers selecting fasteners for aircraft
- Inspectors and certification bodies verifying compliance with aerospace procurement specs
Related standards
- EN 2133 (Cadmium plating), EN 2137 / EN 2442 / EN 3514 (alloy steels), EN 2424 (marking)
- ISO 3193, ISO 5855-2 (MJ threads), ISO 7689, ISO 7913
- Quality systems: EN 9100, EN 9133
EN 4129:2009 is essential when specifying or supplying cadmium-plated, high-strength hexagonal head bolts for aerospace use - ensuring consistent dimensions, materials, plating and traceability across procurement and manufacturing.
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Frequently Asked Questions
EN 4129:2009 is a standard published by the European Committee for Standardization (CEN). Its full title is "Aerospace series - Bolts, normal hexagonal head, coarse tolerance normal shank, medium length thread, in alloy steel, cadmium plated - Classification: 1 100 MPa (at ambient temperature) / 235 °C". This standard covers: This standard specifies the characteristics of bolts, normal hexagonal head, coarse tolerance normal shank, medium length thread, in alloy steel, cadmium plated. Classification: 1 100 MPa 1)/ 235 °C 2)
This standard specifies the characteristics of bolts, normal hexagonal head, coarse tolerance normal shank, medium length thread, in alloy steel, cadmium plated. Classification: 1 100 MPa 1)/ 235 °C 2)
EN 4129:2009 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 4129:2009 has the following relationships with other standards: It is inter standard links to EN 2133:2020, EN 9100:2018, EN 840-6:2004+A1:2008, EN 14460:2006, EN 16855-1:2017, EN 15947-5:2015, EN 2424:2008, EN 9133:2018, EN 4129:2009/AC:2010. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
EN 4129:2009 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.Luft- und Raumfahrt - Sechskantschrauben, mittlere Gewindelänge, aus legiertem Stahl, verkadmet - Klasse : 1 100 MPa (bei Raumtemperatur) / 235 °CSérie aérospatiale - Vis à tête hexagonale normale, tige normale à tolérance large, filetage moyen, en acier allié, cadmiées - Classification : 1 100 MPa (à température ambiante) / 235 °CAerospace series - Bolts, normal hexagonal head, coarse tolerance normal shank, medium length thread, in alloy steel, cadmium plated - Classification: 1 100 MPa (at ambient temperature) / 235 °C49.030.20Sorniki, vijaki, stebelni vijakiBolts, screws, studsICS:Ta slovenski standard je istoveten z:EN 4129:2009SIST EN 4129:2009en01-junij-2009SIST EN 4129:2009SLOVENSKI
STANDARD
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 4129
April 2009 ICS 49.030.20 English Version
Aerospace series - Bolts, normal hexagonal head, coarse tolerance normal shank, medium length thread, in alloy steel, cadmium plated - Classification: 1 100 MPa (at ambient temperature) / 235 °C
Série aérospatiale - Vis à tête hexagonale normale, tige normale à tolérance large, filetage moyen, en acier allié, cadmiées - Classification : 1 100 MPa (à température ambiante) / 235 °C
Luft- und Raumfahrt - Sechskantschrauben, mittlere Gewindelänge, aus legiertem Stahl, verkadmet - Klasse : 1 100 MPa (bei Raumtemperatur) / 235 °C This European Standard was approved by CEN on 12 March 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 4129:2009: ESIST EN 4129:2009
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