SIST EN 3004:2001
(Main)Aerospace series - Nuts, self-locking, MJ threads, in heat resisting steel FE-PA2601 (A286) - Classification: 1 100 MPa (at ambient temperature)/650°C - Technical specification
General Information
- Abstract
This standard specifies the characteristics, qualification and acceptance requirements for self-locking nuts with MJ threads in FE-PA2601. Classification: 1 100 MPa / 650 °C. It is applicable whenever referenced.
- Status
- Published
- Publication Date
- 31-Dec-2000
- Technical Committee
- SS SPL - Technical Board for the general field
- Current Stage
- 6060 - National Implementation/Publication (Adopted Project)
- Start Date
- 01-Jan-2001
- Due Date
- 01-Jan-2001
- Completion Date
- 01-Jan-2001
Overview
EN 3004:1997 (CEN) is a technical specification for aerospace self-locking nuts with MJ threads manufactured from heat-resisting steel FE-PA2601 (A286). The standard defines the characteristics, qualification and acceptance requirements for these nuts and is applicable whenever referenced. Classification is given as 1 100 MPa (at ambient temperature) / 650 °C, indicating the material and component performance expectations for high-temperature aerospace applications.
Key topics
The standard covers the following technical topics and requirements:
- Material specification: use of heat-resisting steel FE-PA2601 (A286) and associated mechanical/thermal performance expectations.
- Thread form: definition and requirements for MJ threads, an aerospace thread type used for critical fastenings.
- Self‑locking performance: criteria for locking behavior to prevent loosening under vibration and thermal cycling.
- Mechanical characteristics: strength classification (notably 1 100 MPa at ambient) and high-temperature performance up to 650 °C.
- Qualification and acceptance: testing and inspection regimes to demonstrate conformity (qualification of design/manufacture and lot acceptance).
- Dimensional and tolerance requirements: form, fit and interchangeability criteria for reliable assembly.
- Traceability and marking: provisions to ensure components are identifiable and traceable to manufacturing/inspection records.
Applications
EN 3004 is intended for aerospace fastener supply chains and engineering where high-temperature, high-strength locking nuts are required. Common practical applications include:
- Engine and exhaust system assemblies exposed to elevated temperatures.
- Hot-structure joints and high‑stress bolted connections in airframes and propulsion systems.
- Repair, overhaul and OEM production of aerospace components requiring certified fasteners.
Using EN 3004 helps ensure fastener reliability in demanding thermal and mechanical environments, reducing risk of loosened joints and improving maintenance traceability.
Who should use this standard
- Aerospace fastener manufacturers and suppliers specifying FE-PA2601 (A286) nuts.
- Design and mechanical engineers selecting fasteners for high-temperature aerospace systems.
- Procurement and quality assurance teams enforcing acceptance and traceability.
- Certification and maintenance organizations verifying component conformity during manufacture and overhaul.
Related standards
EN 3004 sits alongside other CEN/ISO standards for fasteners, threads and aerospace materials. Organizations typically reference EN 3004 in conjunction with broader fastener, material and thread standards to ensure complete specification coverage.
Keywords: EN 3004, self-locking nuts, MJ threads, FE-PA2601, A286, heat resisting steel, aerospace fasteners, 1100 MPa, 650°C, technical specification, qualification and acceptance.
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
- 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
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Frequently Asked Questions
SIST EN 3004:2001 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Aerospace series - Nuts, self-locking, MJ threads, in heat resisting steel FE-PA2601 (A286) - Classification: 1 100 MPa (at ambient temperature)/650°C - Technical specification". This standard covers: This standard specifies the characteristics, qualification and acceptance requirements for self-locking nuts with MJ threads in FE-PA2601. Classification: 1 100 MPa / 650 °C. It is applicable whenever referenced.
This standard specifies the characteristics, qualification and acceptance requirements for self-locking nuts with MJ threads in FE-PA2601. Classification: 1 100 MPa / 650 °C. It is applicable whenever referenced.
SIST EN 3004:2001 is classified under the following ICS (International Classification for Standards) categories: 49.030.30 - Nuts. The ICS classification helps identify the subject area and facilitates finding related standards.
SIST EN 3004:2001 has the following relationships with other standards: It is inter standard links to SIST EN 4122:2005, SIST EN 3015:2015, SIST EN ISO 10440-1:2008, SIST EN 4122:2018, SIST EN 3014:2002, SIST EN ISO 16315:2016, SIST EN 4121:2005, SIST EN ISO 10437:2004, SIST EN 3014:2026, SIST EN 4121:2015, SIST EN 3014:2015, SIST EN 3019:2008, SIST EN 4119:2005, SIST EN ISO 13631:2004, SIST EN 4118:2005. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
SIST EN 3004:2001 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.Aerospace series - Nuts, self-locking, MJ threads, in heat resisting steel FE-PA2601 (A286) - Classification: 1 100 MPa (at ambient temperature)/650°C - Technical specificationLuft- und Raumfahrt - Muttern, selbstsichernd, MJ-Gewinde, aus hochwarmfestem Stahl FE-PA2601 (A286) - Klasse: 1 100 MPa (bei Raumtemperatur)/650°C - Technische LieferbedingungenSérie aérospatiale - Ecrous, a freinage interne, a filetage MJ, en acier résistant a chaud FE-PA2601 (A286) - Classification: 1 100 MPa (a température ambiante)/650°C - Spécification techniqueAerospace series - Nuts, self-
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