SIST EN 4673-004:2010

• Abstract:

  This European Standard specifies the characteristics of self-locking, inserts for Inch series, self-broaching keys, in NI P100HT, silver plated, for aerospace applications.; Classification: 1 270 MPa ) / 600 °C )

• Status: Published
• Publication Date: 14-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: 15-Sep-2010
• Ref Project: EN 4673-004:2010 - Aerospace series - Inserts, UNJ threads, self-locking, with self-broaching keys - Part 004: In heat resisting nickel base alloy NI-P100HT (Inconel 718), silver plating

• 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 2786:2008 - Aerospace series - Electrolytic silver plating of fasteners
• Effective Date: 28-Jan-2026
• Refers: SIST EN 2424:2008 - Aerospace series - Marking of aerospace products
• Effective Date: 28-Jan-2026

SIST EN 4673-004:2010 is the Slovenian standard identical to EN 4673-004:2010 from CEN for aerospace inserts with UNJ threads. It specifies self-locking inserts with self-broaching keys made in NI-P100HT (Inconel 718) with silver plating, for aerospace applications. The scope places the insert in the 1 270 MPa / 600 °C classification range, which matters when selecting a part for strength and temperature capability.

What does SIST EN 4673-004:2010 specify?

SIST EN 4673-004:2010 specifies the characteristics of a family of self-locking inserts for Inch series, with self-broaching keys, in NI-P100HT and silver plated. Clause 1 defines what the insert standard covers, while the opening note points users to EN 4673-002 and EN 4673-001 for design and installation procedures.

The document is organized into seven clauses:

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

Clause 3 uses Figure 1 and Tables 1 to 4 for sizes, dimensions and mass. In practice, this means the standard is not just a general description - it gives the dimensional basis needed to order, make and inspect the inserts.

What are the key requirements of SIST EN 4673-004:2010?

Materials and surface treatment

Clause 3.2 assigns the insert material to EN 2952 treated to 370 HV to 480 HV, and the keys to stainless steel or nickel alloy treated to HV > 600. For a buyer or manufacturer, this fixes the material condition and hardness level that must be met before acceptance.

Clause 3.3 requires the surface treatment to follow EN 2786. That matters because the silver plating is part of the product definition, not an optional finish.

Dimensions, tolerances and insert size ranges

Clause 3.1 states that dimensions and tolerances are in millimetres and apply after silver plating. It refers to Figure 1 and Tables 1, 2 and 3 for configuration, tolerances, masses and the three size groups: normal size, first repair size and second repair size.

The size tables give the thread codes and the associated external thread dimensions and masses. In practice, this is what a designer or purchaser uses to match the insert to the mating thread and to choose the right oversize when repair is needed.

Insert definition and key features

Clause 4 says the detailed definition is shown in Figure 1. The figure and notes describe the key grooves and keys, the out-of-round area used to create the self-locking feature, and the marking area.

The clause also states that sharp edges are to be removed, the number of keys is equally spaced, and the key length shall not exceed E min. Where form details are not stated, the producer may decide them, but the dimensions and location of the keys still have to meet EN 4673-003. This is important because the standard controls the functional geometry while leaving some manufacturing detail open.

Thread dimensions and designation

Clause 4.4 gives the external thread dimensions in Table 4. Clause 5 gives the designation format: a description block, an identity block, and the thread code from Tables 1 to 3.

The oversize code is part of the identity:

• 0 = normal size
• 1 = first repair size
• 2 = second repair size

For ordering and drawing callouts, this is the clause that tells you how to write the part name correctly. Clause 5 also notes that code I9005 may be placed between the description and identity blocks if needed.

Marking and technical specification

Clause 6 requires marking according to EN 2424, style F, with manufacturer identification marks according to TR 3198. Clause 7 points to EN 4673-003 as the technical specification. In practice, Clause 6 covers traceability, while Clause 7 ties the product to the part that gives the technical acceptance rules.

What terms does SIST EN 4673-004:2010 define?

• Self-locking - The insert is designed to resist loosening in service through its locking feature.
• Self-broaching keys - The keys are shaped so the insert can form its locking engagement in the receiving material.
• UNJ threads - The internal and external thread forms used for this insert family.
• Normal size insert - The standard size version identified by oversize code 0.
• First repair size insert - The first oversize repair version identified by oversize code 1.
• Second repair size insert - The second oversize repair version identified by oversize code 2.
• NI-P100HT - The nickel-base heat-resisting alloy specified for the insert body.
• Silver plating - The surface treatment required on the insert after manufacture.

Who uses SIST EN 4673-004:2010?

SIST EN 4673-004:2010 is used by aerospace design engineers, fastener manufacturers, quality teams and purchasing staff who specify threaded inserts for aircraft and related equipment. It is also used by inspectors and production personnel who need to verify material condition, plating, dimensions, marking and the correct designation.

The repair-size options make the standard relevant for maintenance and overhaul work as well as original manufacture. That matters when a damaged thread has to be restored using the correct oversize insert.

Which standards are used with SIST EN 4673-004:2010?

• EN 2424 - gives the marking style for aerospace products.
• EN 2786 - specifies electrolytic silver plating of fasteners.
• EN 2952 - gives the material condition for the insert body.
• EN 4673-001 - gives the installation and removal procedure.
• EN 4673-002 - gives the design standard referred to for design and installation procedures.
• EN 4673-003 - gives the technical specification used with this part.
• ISO 3161 - gives the general requirements and limit dimensions for UNJ threads.
• TR 3198 - lists manufacturers' identification monograms and marks for EN aerospace products.

What does the SIST EN 4673-004:2010 document contain?

The document contains one main figure and four sizing tables that define the insert family. Figure 1 shows the insert configuration and the locations of the keys and marking area. Tables 1 to 3 set out the normal size, first repair size and second repair size inserts, including thread codes, dimensions and masses.

Table 4 gives the external thread dimensions for the listed thread codes. Clause 5 gives a worked designation format, and Clause 6 gives the marking rules used for identification and traceability.

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.SRVUHEUHQLLuft- und Raumfahrt - Gewindeeinsätze, UNJ-Gewinden, selbstsichernd, mit selbsträumenden Stiften - Teil 004: Aus Hochwarmfeste Nickellegierung NI-P100HT (Inconel 718), VersilbernSérie aérospatiale - Douilles filetées, à filetage UNJ, à freinage interne, à clavettes auto-brochantes - Partie 004 : En alliage résistant à chaud base nickel NI-P100HT (Inconel 718), argentageAerospace series - Inserts, UNJ threads, self-locking, with self-broaching keys - Part 004: In heat resisting nickel base alloy NI-P100HT (Inconel 718), silver plating49.030.30MaticeNutsICS:Ta slovenski standard je istoveten z:EN 4673-004:2010SIST EN 4673-004:2010en01-oktober-2010SIST EN 4673-004:2010SLOVENSKI
STANDARD
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 4673-004
August 2010 ICS 49.030.30 English Version
Aerospace series - Inserts, UNJ threads, self-locking, with self-broaching keys - Part 004: In heat resisting nickel base alloy NI-P100HT (Inconel 718), silver plating
Série aérospatiale - Douilles filetées, à filetage UNJ, à freinage interne, à clavettes auto-brochantes - Partie 004: En alliage résistant à chaud base nickel NI-P100HT (Inconel 718), argentage
Luft- und Raumfahrt - Gewindeeinsätze, UNJ-Gewinden, selbstsichernd, mit selbsträumenden Stiften -Teil 004: Aus Hochwarmfeste Nickellegierung NI-P100HT (Inconel 718), Versilbern 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, 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.
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