SIST EN 4673-006:2010

• Abstract:

  This European Standard specifies the characteristics of self-locking, inserts for Inch series, self-broaching keys, in FE PA2601, MoS2 coated, for aerospace applications.; Classification: 900 MPa / 315 °C

• Status: Published
• Publication Date: 15-Sep-2010
• ICS: 49.030.30 - Nuts
• Technical Committee: I13 - Imaginarni 13
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Sep-2010
• Due Date: 06-Nov-2010
• Completion Date: 16-Sep-2010
• Ref Project: EN 4673-006:2010 - Aerospace series - Inserts, UNJ threads, self-locking, with self-broaching keys - Part 006: In heat resisting steel FE-PA2601 (A286), MoS2 coated

• Refers: SIST EN 4673-003:2010 - Aerospace series - Inserts, UNJ threads, self-locking, with self-broaching keys - Part 003: Technical specification
• Effective Date: 28-Jan-2026
• Refers: SIST EN 4673-001:2010 - Aerospace series - Inserts, UNJ threads, self-locking, with self-broaching keys - Part 001: Installation and removal procedure
• Effective Date: 28-Jan-2026
• Refers: SIST EN 10244-1:2009 - Steel wire and wire products - Non-ferrous metallic coatings on steel wire - Part 1: General principles
• Effective Date: 28-Jan-2026
• Refers: SIST EN 4673-002:2010 - Aerospace series - Inserts, UNJ threads, self-locking, with self-broaching keys - Part 002: Design standard
• 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 2399:2008 - Aerospace series - Heat resisting steel FE-PA2601 (X4NiCrTiMoV26-15) - Rm ≥ 900 MPa - Bars for forged bolts - D ≤ 25 mm
• Effective Date: 28-Jan-2026
• Refers: SIST EN 2424:2008 - Aerospace series - Marking of aerospace products
• Effective Date: 28-Jan-2026

SIST EN 4673-006:2010 is the Slovenian adoption of EN 4673-006:2010, a European standard for aerospace inserts with UNJ threads, self-locking action and self-broaching keys. It specifies the characteristics of inserts made from heat resisting steel FE-PA2601 (A286) with a MoS2 coating, for aerospace applications.

What does SIST EN 4673-006:2010 specify?

SIST EN 4673-006:2010 specifies the characteristics of self-locking inserts for Inch series threads, with self-broaching keys, in FE-PA2601 with MoS2 coating. The document is aimed at aerospace applications and gives the basis for selecting, identifying and checking these inserts.

The standard is classified for 900 MPa / 315 °C. In practice, that tells the user the strength level and the temperature capability associated with the material and lubricant system.

The document is organized into these main clauses:

• Scope
• Normative references
• Required characteristics
• Insert definition
• Designation
• Marking
• Technical specification

What are the key requirements of SIST EN 4673-006:2010?

SIST EN 4673-006:2010 sets the dimensions, material condition, coating, sizing and identification rules that make the inserts interchangeable and suitable for aerospace use.

Configuration, dimensions and masses

Clause 3.1 sends the user to Figure 1 and Tables 1 to 4 for configuration, dimensions, tolerances and masses. The dimensions and tolerances are in millimetres and apply before MoS coating. That matters because inspection and tooling must be based on the uncoated size.

Material condition

Clause 3.2 requires the insert body to comply with EN 3639 and EN 2399, treated to 370 HV to 435 HV. The keys are to be stainless steel or nickel alloy treated for HV > 600. In practice, this sets the hardness and material family needed for wear resistance and self-locking function.

Surface treatment

Clause 3.3 points to EN 2491 for the surface treatment. This means the dry lubricant coating method is controlled by a separate aerospace standard, so the coating process and its verification are not left to local practice.

Insert form and key arrangement

Clause 4 and Figure 1 define the insert geometry, including the self-locking out-of-round area, equally spaced keys, edge breaking and the note that key dimensions and location shall meet EN 4673-003. For users, this is the part that controls how the insert locks into the parent material and how the installation tools engage it.

Size families and repair sizes

Clauses 4.1 to 4.3 define normal size inserts, first repair size inserts and second repair size inserts. The designation code uses 0 for normal size, 1 for first repair size and 2 for second repair size. In practice, this lets designers and maintenance teams choose the correct insert after initial assembly or repair.

External thread dimensions

Clause 4.4 and Table 4 give the external thread dimensions by major, pitch and minor diameter. The thread dimensions are given in accordance with ISO 3161. This is what users check to make sure the insert matches the receiving hole and maintains thread compatibility.

Designation and marking

Clause 5 gives the designation structure, with a description block and an identity block, and the example EN4673-006-5-0. Clause 6 requires marking in accordance with EN 2424, style F, with manufacturer identification marks per TR 3198. This is what supports ordering, traceability and parts control.

What terms does SIST EN 4673-006:2010 define?

• UNJ threads - the inch thread form used for these inserts, with general requirements and limit dimensions given by ISO 3161.
• Self-locking - the insert is designed to resist loosening in service.
• Self-broaching keys - keys that help secure the insert by broaching their seat during installation.
• FE-PA2601 (A286) - the heat resisting steel specified for the insert body.
• MoS2 - molybdenum disulphide, used here as a dry lubricant coating.
• Normal size insert - the standard insert size, identified by code 0.
• First repair size insert - the oversize repair version identified by code 1.
• Second repair size insert - the larger oversize repair version identified by code 2.

Who uses SIST EN 4673-006:2010?

SIST EN 4673-006:2010 is used by aerospace design engineers, fastener manufacturers, installation and removal technicians, quality inspectors and buyers. They use it to choose the correct insert size, verify materials and coating, control marking and check compliance with the technical specification.

It is also relevant when defining repair parts, because the standard includes normal and repair sizes as separate designations.

Which standards are used with SIST EN 4673-006:2010?

• EN 2399 - specifies the heat resisting steel FE-PA2601 bar material referenced for the insert body.
• EN 2424 - gives the marking style used on the product.
• EN 2491 - specifies molybdenum disulphide dry lubricant coating methods.
• EN 3639 - specifies the FE-PA2601 wire material referenced for the insert body.
• EN 4673-001 - gives the installation and removal procedure.
• EN 4673-002 - gives the design standard for this insert family.
• EN 4673-003 - gives the technical specification for these inserts.
• ISO 3161 - gives general requirements and limit dimensions for UNJ threads.
• TR 3198 - gives manufacturers' identification monograms and marks for EN aerospace products.

What does the SIST EN 4673-006:2010 document contain?

The document contains Figure 1, which shows the insert form and key arrangement, and Tables 1 to 4, which set out the normal and repair sizes, dimensions, masses and external thread limits. It also contains a designation example that shows how the thread code and oversize code are combined.

For users, the practical value is in the measured data and the coded identification rules. For manufacturers and inspectors, the tables and figure support tooling, dimensional control and part marking. For designers, the references to EN 4673-001, EN 4673-002 and EN 4673-003 show where to find installation, design and technical specification details.

SLOVENSKI STANDARD
01-november-2010
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GHO,]WRSORWQRRGSRUQHJDMHNOD)(3$$PD]DQL]0R6
Aerospace series - Inserts, UNJ threads, self-locking, with self-broaching keys - Part
006: In heat resisting steel FE-PA2601 (A286), MoS2 coated
Luft- und Raumfahrt - Gewindeeinsätze, UNJ-Gewinden, selbstsichernd, mit
selbsträumenden Stiften - Teil 006: Mit selbsträumenden Stiften, aus hochwarmfestem
Stahl FE-PA2601 (A286), MoS2 beschichtet
Série aérospatiale - Douilles filetées, à filetage UNJ, à freinage interne, à clavettes auto-
brochantes - Partie 006 : En acier résistant à chaud FE-PA2601 (A286), revêtues MoS2
Ta slovenski standard je istoveten z: EN 4673-006:2010
ICS:
49.030.30 Matice Nuts
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 4673-006
NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2010
ICS 49.030.30
English Version
Aerospace series - Inserts, UNJ threads, self-locking, with self-
broaching keys - Part 006: In heat resisting steel FE-PA2601
(A286), MoS coated
Série aérospatiale - Douilles filetées, à filetage UNJ, à Luft- und Raumfahrt - Gewindeeinsätze, UNJ-Gewinden,
freinage interne, à clavettes auto-brochantes - Partie 006: selbstsichernd, mit selbsträumenden Stiften - Teil 006: Mit
En acier résistant à chaud FE-PA2601 (A286), revêtues selbsträumenden Stiften, aus hochwarmfestem Stahl FE-
2 2
MoS PA2601 (A286), MoS beschichtet
This European Standard was approved by CEN on 12 June 2010.

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, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
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EUROPÄISCHES KOMITEE FÜR NORMUNG

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© 2010 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 4673-006:2010: E
worldwide for CEN national Members.

Contents Page
Foreword .3
Introduction .4
1 Scope .4
2 Normative references .4
3 Required characteristics .4
3.1 Configuration – Dimensions – Tolerances – Masses .4
3.2 Material .5
3.3 Surface treatment .5
4 Insert definition .5
4.1 Normal size insert .6
4.2 First repair size insert .6
4.3 Second repair size insert .7
4.4 External thread dimension .7
5 Designation .8
6 Marking .8
7 Technical specification .8

Foreword
This document (EN 4673-006:2010) has been prepared by the Aerospace and Defence Industries Association
of Europe - Standardization (ASD-STAN).
After enquiries and votes carried out in accordance with the rules of this Association, this Standard has
received the approval of the National Associations and the Official Services of the member countries of ASD,
prior to its presentation to CEN.
This European Standard shall be given the status of a national standard, either by publication of an identical
text or by endorsement, at the latest by February 2011, and conflicting national standards shall be withdrawn
at the latest by February 2011.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slov
...