SIST EN 3325:2008
(Main)Aerospace series - Bolts, T-head, relieved shank, long thread, in heat resisting steel, FE-PM1708 (FV535) - Classification: 1 000 MPa/550 °C - Unplated
- Abstract
This standard specifies the characteristics of T-head bolts with relieved shank and long thread, in FE-PM1708 (FV535), for aerospace applications.
Classification: 1 000 MPa ) / 550 °C ).
- Status
- Published
- Publication Date
- 15-Jan-2008
- Technical Committee
- I13 - Imaginarni 13
- Current Stage
- 6060 - National Implementation/Publication (Adopted Project)
- Start Date
- 08-Jan-2008
- Due Date
- 14-Mar-2008
- Completion Date
- 16-Jan-2008
SIST EN 3325:2008 is the Slovenian adoption of EN 3325:2007, published by SIST for aerospace use. It specifies T-head bolts with a relieved shank and long thread, made from FE-PM1708 (FV535) heat-resisting steel, in the 1 000 MPa/550 °C classification, supplied unplated. The document is meant for people who design, order, inspect or identify these bolts in aerospace work.
What does SIST EN 3325:2008 specify?
SIST EN 3325:2008 specifies the characteristics of a defined aerospace bolt family: T-head bolts with relieved shank and long thread in FE-PM1708 (FV535). The standard ties the product to a strength and temperature classification, and it fixes the way the bolts are designated and marked.
| Clause | What it covers |
|---|---|
| 1 | Scope |
| 2 | Normative references |
| 3 | Required characteristics |
| 4 | Designation |
| 5 | Marking |
| 6 | Technical specification |
Clause 1 defines the product and the aerospace application. Clause 3 then points to the geometry, dimensions, tolerances, material and mass data that control interchangeability and inspection.
What are the key requirements of SIST EN 3325:2008?
Geometry, dimensions and fit
Clause 3.1 requires the bolt configuration, dimensions, tolerances and masses to follow Figure 1 and Tables 1 and 2, with dimensions in millimetres. In practice, this is the main reference for drawing checks, incoming inspection and part matching.
Table 1 gives the thread codes and the related dimensional data, and Table 2 gives the dimensional codes, lengths and approximate masses. For a buyer or engineer, that means the bolt must be ordered and checked by the standard’s code system, not by a free-text description alone.
Material and thread references
Clause 3.2 assigns the material requirement to EN 2493, and the standard also cites EN 4244 and EN 4245 in the notes. In practice, this tells the user that the bolt material is not generic steel but a defined aerospace heat-resisting material route.
The normative references also include ISO 3353-1 for lead and runout threads and ISO 5855-2 for MJ thread limit dimensions. That matters because the thread form and thread ends must match aerospace thread practice for fit, gauging and assembly.
Designation, marking and technical specification
Clause 4 shows how to build the designation: a description block plus an identity block using the standard number, thread code and length code. If needed, code I9005 is inserted between the blocks. This is the ordering language used in purchasing and documentation.
Clause 5 requires marking to EN 2424, category A, as shown in Figure 1. For users, this means the part identification is standardized and traceable.
Clause 6 points users to EN 3302 for the technical specification. In practice, SIST EN 3325:2008 defines the bolt family, while EN 3302 carries the broader technical conditions for that family.
What terms does SIST EN 3325:2008 define?
- T-head bolt - A bolt with a T-shaped head, used where the head must locate or resist rotation in an aerospace assembly.
- Relieved shank - A shank with a reduced section, which helps control load distribution and installation behavior.
- Long thread - A thread length greater than a basic short-thread layout, giving more engagement options in assembly.
- FE-PM1708 (FV535) - The heat-resisting steel named by the standard for these bolts.
- MJ threads - Aerospace metric threads governed here by the referenced MJ limit-dimension standard.
- Unplated - Supplied without a protective coating or plating.
- Rm - Minimum tensile strength at ambient temperature, used in the classification notes.
Who uses SIST EN 3325:2008?
SIST EN 3325:2008 is used by aerospace fastener manufacturers, distributors, design engineers, purchasing teams and quality inspectors. They use it to specify the bolt type, confirm thread and length codes, set marking rules, and verify that supplied parts match the required aerospace form and material route.
Which standards are used with SIST EN 3325:2008?
- ISO 3353-1 - Gives the lead and runout thread rules for rolled external threads.
- ISO 5855-2 - Gives MJ limit dimensions for bolts and nuts.
- EN 2424 - Sets marking rules for aerospace products.
- EN 2493 - Is cited for the material requirement in clause 3.2.
- EN 3302 - Gives the technical specification for this bolt family.
- EN 4244 - Covers vacuum arc remelted FE-PM1708 bar.
- EN 4245 - Covers FE-PM1708 forging stock.
What does the SIST EN 3325:2008 document contain?
SIST EN 3325:2008 contains one figure and two main data tables that support design and inspection. Figure 1 shows the bolt configuration and marking position, while Table 1 gives the thread-related dimensions and Table 2 gives the approved length codes with approximate masses.
The document also gives the designation rule in clause 4, which is what procurement and part numbering systems rely on. Clause 5 defines the marking reference, so manufacturers can identify the part consistently. Clause 6 links users to the technical specification that completes the product definition.
Relations
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
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Frequently Asked Questions
SIST EN 3325:2008 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Aerospace series - Bolts, T-head, relieved shank, long thread, in heat resisting steel, FE-PM1708 (FV535) - Classification: 1 000 MPa/550 °C - Unplated". This standard covers: This standard specifies the characteristics of T-head bolts with relieved shank and long thread, in FE-PM1708 (FV535), for aerospace applications. Classification: 1 000 MPa ) / 550 °C ).
This standard specifies the characteristics of T-head bolts with relieved shank and long thread, in FE-PM1708 (FV535), for aerospace applications. Classification: 1 000 MPa ) / 550 °C ).
SIST EN 3325:2008 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.
SIST EN 3325:2008 has the following relationships with other standards: It is inter standard links to SIST EN 13848-1:2004+A1:2008, SIST EN 3302:2017, SIST EN 2424:2008. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
SIST EN 3325:2008 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 - Bolts, T-head, relieved shank, long thread, in heat resisting steel, FE-PM1708 (FV535) - Classification: 1 000 MPa/550 °C - UnplatedAeronavtika - Sorniki, glava T, tanko steblo, dolg navoj, iz toplotnoodpornega jekla, FE-PM1708 (FV535) - Klasifikacija: 1 000 MPa/550 °C - Brez prevlekeSérie aérospatiale - Vis à tête anti-rotation T, fût dégagé, filetage long, en acier résistant à chaud FE-PM1708 (FV535) - Classification: 1 000 MPa/550 °C - Non revêtuesLuft- und Raumfahrt - T-Kopfschrauben, Dünnschaft, langes Gewinde, aus hochwarmfestem Stahl FE-PM1708 (FV535) - Klasse: 1 000 MPa/550 °C - BlankTa slovenski standard je istoveten z:EN 3325:2007SIST EN 3325:2008en49.030.20ICS:SLOVENSKI
STANDARDSIST EN 3325:200801-marec-2008
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 3325
December 2007 ICS 49.030.20 English Version
Aerospace series - Bolts, T-head, relieved shank, long thread, in heat resisting steel, FE-PM1708 (FV535) - Classification: 1 000 MPa/550 °C - Unplated
Série aérospatiale - Vis à tête anti-rotation “T”, fût dégagé, filetage long, en acier résistant à chaud FE-PM1708 (FV535) - Classification: 1 000 MPa/550 °C - Non revêtues Luft- und Raumfahrt - T-Kopfschrauben, Dünnschaft, langes Gewinde, aus hochwarmfestem Stahl FE-PM1708 (FV535) - Klasse: 1 000 MPa/550 °C - Blank This European Standard was approved by CEN on 5 November 2007.
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: rue de Stassart, 36
B-1050 Brussels © 2007 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 3325:2007: E
1 140 MPa — Bars — Aerospace series. 4) EN 3302, Aerospace series — Bolts in heat r
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