SIST EN 3831:2005

Aerospace series - Inserts, thickwall, self-locking, MJ threads, in heat resisting steel FE-PM3801 (17-4PH), MoS2 coated

This standard specifies the characteristics of self-locking, thickwall inserts, in FE-PM3801, MoS2 coated, for aerospace applications.
Maximum test temperature: 350 °C

Luft- und Raumfahrt - Gewindeeinsätze, dickwandig, selbstsichernd, MJ-Gewinde, aus hochwarmfestem Stahl FE-PM3801 (17-4PH), MoS2-beschichtet

Série aérospatiale - Douilles filetées, a paroi renforcée, a freinage interne, a filetage MJ, en acier résistant a chaud FE-PM3801 (17-4PH), revetues MoS2

La présente norme spécifie les caractéristiques des douilles filetées, à paroi renforcée, à freinage interne, à filetage MJ, en FE PM3801, revêtues MoS2, pour applications aérospatiales.
Température maximale d'essai : 350 °C.
Pour les procédures de conception et d'installation, voir EN 4014 et EN 4015.

Aerospace series - Inserts, thickwall, self-locking, MJ threads, in heat resisting steel FE-PM3801 (17-4PH), MoS2 coated

General Information

• Status: Published
• Publication Date: 31-May-2005
• ICS: 49.030.30 - Nuts
• Technical Committee: SS SPL - Technical Board for the general field
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Jun-2005
• Due Date: 01-Jun-2005
• Completion Date: 01-Jun-2005
• Ref Project: EN 3831:2004 - Aerospace series - Inserts, thickwall, self-locking, MJ threads, in heat resisting steel FE-PM3801 (17-4PH), MoS2 coated

Relations

• Replaces: SIST EN 3831:2004 - Aerospace series - Inserts, thickwall, self-locking, in heat resisting steel FE-PM3801 (17-4PH), MoS2 coated
• Effective Date: 01-Jun-2005

Overview

EN 3831:2004 is a CEN (European) aerospace standard that specifies the characteristics of self‑locking, thickwall inserts with MJ threads, manufactured in heat‑resisting stainless steel FE‑PM3801 (17‑4PH) and MoS2 (molybdenum disulphide) coated. Intended for aerospace use, the document defines configuration, dimensions, tolerances and marking requirements for both nominal and repair‑size inserts. The standard notes a maximum test temperature of 350 °C and references design and installation procedures in EN 4014 and EN 4015.

Key topics and requirements

• Product scope: Thickwall, self‑locking inserts with MJ threads for aerospace fastener systems.
• Material: Inserts must be made from FE‑PM3801 (17‑4PH) conforming to EN 3906 (martensitic, corrosion‑resisting steel for fasteners).
• Surface treatment: MoS2 dry lubricant coating per EN 2491. Dimensions and tolerances are given before MoS2 coating.
• Temperature limit: Maximum test temperature specified is 350 °C.
• Configuration and tolerances: Detailed nominal and repair size tables (dimensions in millimetres) and figures define geometry, serration (knurl) and out‑of‑round features required for the self‑locking function.
• Designation and marking: Standardized designation format (e.g., INSERT THICKWALL EN3831‑050‑1) and marking per EN 2424 (style G). Manufacturer identification follows TR 3198.
• Related technical specification: EN 3899 provides the technical specification; design and installation guidance are covered in EN 4014 and EN 4015.
• Standards compliance: Thread interfaces reference ISO 5855‑1 and ISO 5855‑2 for MJ thread form and limits.

Practical applications

• Used in aerospace structures and components where durable, high‑temperature resistant threaded inserts are required for repeated assembly and secure joints.
• Typical users: aerospace designers, fastener manufacturers, qualification/test engineers, procurement specialists, and maintenance/repair organizations specifying or installing inserts in airframes, engine mounts or high‑temperature assemblies.
• Benefits include consistent thread form (MJ threads), self‑locking retention, corrosion resistance from 17‑4PH material, and reduced friction/wear from MoS2 coating.

Related standards

• ISO 5855‑1, ISO 5855‑2 (MJ thread general and limits)
• EN 2424 (marking of aerospace products)
• EN 2491 (MoS2 coating methods)
• EN 3899 (technical specification for these inserts)
• EN 3906 (material spec for FE‑PM3801 / 17‑4PH)
• EN 4014 (design standard for thickwall self‑locking inserts)
• EN 4015 (installation and removal procedures)
• TR 3198 (manufacturer identification marks)

EN 3831:2004 is essential when specifying aerospace inserts, ensuring compatibility, traceability and performance for high‑temperature, high‑reliability applications.

Standards Content (Sample)

SLOVENSKI STANDARD
01-junij-2005
1DGRPHãþD
SIST EN 3831:2004
Aerospace series - Inserts, thickwall, self-locking, MJ threads, in heat resisting
steel FE-PM3801 (17-4PH), MoS2 coated
Aerospace series - Inserts, thickwall, self-locking, MJ threads, in heat resisting steel FE-
PM3801 (17-4PH), MoS2 coated
Luft- und Raumfahrt - Gewindeeinsätze, dickwandig, selbstsichernd, MJ-Gewinde, aus
hochwarmfestem Stahl FE-PM3801 (17-4PH), MoS2-beschichtet
Série aérospatiale - Douilles filetées, a paroi renforcée, a freinage interne, a filetage MJ,
en acier résistant a chaud FE-PM3801 (17-4PH), revetues MoS2
Ta slovenski standard je istoveten z: EN 3831:2004
ICS:
49.030.30 Matice Nuts
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 3831
NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2004
ICS 49.030.30 Supersedes EN 3831:2003
English version
Aerospace series - Inserts, thickwall, self-locking, MJ threads, in
heat resisting steel FE-PM3801 (17-4PH), MoS2 coated
Série aérospatiale - Douilles filetées, à paroi renforcée, à Luft- und Raumfahrt - Gewindeeinsätze, dickwandig,
freinage interne, à filetage MJ, en acier résistant à chaud selbstsichernd, MJ-Gewinde, aus hochwarmfestem Stahl
FE-PM3801 (17-4PH), revêtues MoS2 FE-PM3801 (17-4PH), MoS2-beschichtet
This European Standard was approved by CEN on 11 September 2003.

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 Central Secretariat 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
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© 2004 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 3831:2004: E
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Contents                                                                         Page

Foreword.3
1 Scope .4
2 Normative references .4
3 Required characteristics.4
4 Insert definition.5
5 Designation .6
6 Marking .6
7 Technical specification .6
Foreword
This document (EN 3831:2004) has been prepared by the European Association of Aerospace
Manufacturers - Standardization (AECMA-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
AECMA, prior to its presentation to CEN.
This European Standa
...