prEN 3196

• Abstract:

  This document specifies the characteristics of self-locking hexagonal nuts in FE-PA92HT, silver plated, for aerospace applications.; Classification: 1 100 MPa1/425 °C2.

• Status: Not Published
• Publication Date: 19-Oct-2027
• ICS: 49.030.30 - Nuts
• Technical Committee: ASD-STAN - Aerospace
• Drafting Committee: ASD-STAN/D 3/S 2 - Fasteners
• Current Stage: 4060 - Closure of enquiry - Enquiry
• Start Date: 16-Jul-2026
• Completion Date: 16-Jul-2026
• Ref Project: oSIST prEN 3196:2026 - Aerospace series - Nuts, hexagonal, self-locking, in heat resisting steel FE-PA92HT (A286), silver plated - Classification : 1 100 MPa (at ambient temperature) / 425 °C

• Revises: EN 3196:1994 - Aerospace series - Nuts, hexagonal, self-locking, in heat resisting steel FE-PA92HT (A286), silver plated - Classification: 1 100 MPa (at ambient temperature) / 425 °C
• Effective Date: 20-Jan-2026

Overview

prEN 3196 defines the requirements for self-locking, hexagonal nuts made from heat resisting steel FE-PA92HT (A286), with a silver-plated finish, intended for aerospace applications. These fasteners are classified for use at 1,100 MPa strength at ambient temperature and up to 425 °C. The standard was prepared by CEN's ASD-STAN technical committee and will supersede EN 3196:1994, incorporating expanded materials references and updated technical requirements.

Complying with prEN 3196 ensures high-quality, reliable fastening solutions for aerospace manufacturers, suppliers, and maintenance providers seeking consistent performance in demanding environments.

Key Topics

• Product Scope: Specifies hexagonal, self-locking nuts made from FE-PA92HT (A286) heat resisting steel, with a durable silver-plated surface.
• Application Environment: Designed to retain mechanical strength at ambient condition up to 425 °C, ensuring reliability under temperature extremes typical in aerospace assemblies.
• Classification: Strength rating of 1,100 MPa; suitable for bolts with corresponding load requirements.
• Dimensions & Tolerances: Detailed configuration, dimensions, and tolerances aligned with ISO 7995 and ISO 5855-2 for compatibility across aerospace assemblies.
• Material Standards: References to established materials and plating standards (EN 2399, EN 3638, EN 3639, TR 3791, and SAE AMS5525), providing flexibility for manufacturers while guaranteeing performance.
• Surface Treatment: Silver-plated per EN 2786 for enhanced corrosion resistance and optimized performance in high-temperature, corrosive conditions.
• Marking & Designation: Nut identification and traceability in line with EN 2424, aiding quality assurance and supply chain management.
• Quality and Certification: Manufacturer approval and product qualification must align with EN 9100 and EN 9133 standards for aerospace sector quality management.

Applications

prEN 3196 nuts are used widely across the aerospace industry where there is a need for:

• High-Temperature Fastening: Engine and airframe components subjected to continuous or cyclical thermal loads.
• Critical Joints: Assemblies where self-locking feature prevents loosening due to vibration or thermal expansion-contraction cycles.
• Corrosive or Hostile Environments: Locations demanding both strength and resistance to environmental degradation.
• Standardization Across Programs: Alignment with international aerospace hardware standards simplifies procurement and reduces costs for multi-program manufacturers and maintenance providers.

By adhering to prEN 3196, companies can demonstrate compliance with European aerospace requirements, supporting airworthiness, safety, and product reliability throughout the fastener's lifecycle.

Related Standards

For comprehensive aerospace fastener compliance, prEN 3196 should be considered alongside:

• EN 2424: Marking of aerospace products
• EN 2786: Electrolytic silver plating of fasteners
• EN 2399, EN 3638, EN 3639: Materials for heat resisting steel fasteners
• ISO 5855-2, ISO 7995: Dimensions for aerospace bolts and nuts
• EN 3152: Technical specifications for similar nuts
• EN 9100: Quality management for aerospace suppliers
• EN 9133: Procedures for qualification of aerospace standard products
• TR 3791, SAE AMS5525: Additional material standards for self-locking nuts

Using prEN 3196 in combination with related documents helps organizations ensure compatibility, safety, and performance across diverse aerospace fastening applications. This promotes efficiency and reliability in the manufacture, maintenance, and operation of aircraft systems worldwide.

SLOVENSKI STANDARD
01-julij-2026
Aeronavtika - Matice, šestrobe, samozapiralne, iz toplotnoodpornega jekla FE-
PA92HT (A286), posrebrene - Klasifikacija: 1100 MPa (pri temperaturi okolice)/425
°C
Aerospace series - Nuts, hexagonal, self-locking, in heat resisting steel FE-PA92HT
(A286), silver plated - Classification : 1 100 MPa (at ambient temperature) / 425 °C
Luft‑ und Raumfahrt - Sechskantmutter, selbstsichernd, aus hochwarmfesten Stahl
FE‑PA92HT (A286), versilbert - Klasse: 1 100 MPa (bei Raumtemperatur)/425 °C
Ta slovenski standard je istoveten z: prEN 3196
ICS:
49.025.10 Jekla Steels
49.030.30 Matice Nuts
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
EUROPEAN STANDARD
NORME EUROPÉENNE
EUROPÄISCHE NORM
April 2026
ICS 49.030.30 Will supersede EN 3196:1994
English Version
Aerospace series - Nuts, hexagonal, self-locking, in heat
resisting steel FE-PA92HT (A286), silver plated -
Classification : 1 100 MPa (at ambient temperature) / 425
°C
Luft- und Raumfahrt ¿ Sechskantmutter,
selbstsichernd, aus hochwarmfesten Stahl FE-PA92HT
(A286), versilbert ¿ Klasse: 1 100 MPa (bei
Raumtemperatur)/425 °C
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee ASD-
STAN.
If this draft becomes a European Standard, 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.

This draft European Standard was established by CEN 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-CENELEC
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, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2026 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 3196:2026 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
1 Scope . 4-s
2 Normative references . 4
3 Terms and definitions . 5
4 Required characteristics . 5
4.1 Configuration – Dimensions – Tolerances – Mass . 5
4.2 Materials . 5
4.3 Surface treatment . 5
5 Designation . 8
6 Marking . 8
7 Technical specification . 8
7.1 General. 8
7.2 Approval of manufacturers . 8
7.3 Qualification of products . 8
Bibliography . 9

European foreword
This document (prEN 3196:2026) has been prepared by ASD-STAN.
After enquiries and votes carried out in accordance with the rules of this Association, this document has
received the approval of the National Associations and the Official Services of the member countries of
ASD-STAN, prior to its presentation to CEN.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 3196:1994.
EN 3196:1994:
— Clause 3, “Terms and definitions”, added;
— 4.2, “Materials”, standards TR 3791 and SAE AMS5525 added;
— Clause 7, “Technical specification”, editorially revised.
1 Scope
This document specifies the characteristics of self-locking hexag
...