SIST EN 3299:2019

SLOVENSKI STANDARD
SIST EN 3299:2019
01-september-2019
Nadomešča:
SIST EN 3299:2009
Aeronavtika - Gredne matice in navojni obroči, samozapiralni, levi ali desni navoj
MJ, iz toplotnoodpornega jekla FE-PA2601 (A286), posrebreni - Tehnična
specifikacija
Aerospace series - Shaft-nuts and threaded rings, self-locking, right- or left-hand MJ
threads, in heat resisting steel FE-PA2601 (A286), silver plated - Technical specification
Luft- und Raumfahrt - Wellenmuttern und Gewinderinge, selbstsichernd, Rechts- oder
Links-MJ-Gewinde, aus hochwarmfestem Stahl FE-PA2601 (A286), versilbert -
Technische Lieferbedingungen
Série aérospatiale - Écrous d'arbres et bagues filetées, à freinage interne, filetage MJ à
droite ou à gauche, en acier résistant à chaud FE-PA2601 (A286), argentés -
Spécification technique
Ta slovenski standard je istoveten z: EN 3299:2019
ICS:
49.030.30 Matice Nuts
49.030.50 Podložke in drugi blokirni Washers and other locking
elementi elements
SIST EN 3299:2019 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 3299:2019

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SIST EN 3299:2019


EN 3299
EUROPEAN STANDARD

NORME EUROPÉENNE

July 2019
EUROPÄISCHE NORM
ICS 49.030.30; 49.030.50 Supersedes EN 3299:2007
English Version

Aerospace series - Shaft-nuts and threaded rings, self-
locking, right- or left-hand MJ threads, in heat resisting
steel FE-PA2601 (A286), silver plated - Technical
specification
Série aérospatiale - Écrous d'arbres et bagues filetées, Luft- und Raumfahrt - Wellenmuttern und
à freinage interne, filetage MJ à droite ou à gauche, en Gewinderinge, selbstsichernd, Rechts- oder Links-MJ-
acier résistant à chaud FE-PA2601 (A286), argentés - Gewinde, aus hochwarmfestem Stahl FE-PA2601
Spécification technique (A286), versilbert - Technische Lieferbedingungen
This European Standard was approved by CEN on 1 March 2019.

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-CENELEC 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-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, Turkey and
United Kingdom.





EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 3299:2019 E
worldwide for CEN national Members.

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SIST EN 3299:2019
EN 3299:2019 (E)
Contents
Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
4 Quality assurance . 6
5 Requirements . 7
Annex A (normative) Checking bearing surface perpendicularity . 15
Annex B (normative) Method of checking locking torque . 18
Annex C (normative) Hardness test . 21



2

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SIST EN 3299:2019
EN 3299:2019 (E)
European foreword
This document (EN 3299:2019) 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 January 2020, and conflicting national standards shall
be withdrawn at the latest by January 2020.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 3299:2007.
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, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the
United Kingdom.
3

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SIST EN 3299:2019
EN 3299:2019 (E)
1 Scope
This European standard specifies the characteristics, qualification and acceptance requirements for
self-locking shaft-nuts and threaded rings, with right- or left-hand MJ threads, in FE-PA2601,
silver-plated, for aerospace applications.
1
Temperature class: 450 °C .
It is applicable whenever referenced.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
EN 2786, Aerospace series — Electrolytic silver plating of fasteners
EN ISO 4288, Geometrical product specifications (GPS) — Surface texture: Profile method — Rules and
procedures for the assessment of surface texture
EN ISO 6507-1, Metallic materials — Vickers hardness test — Part 1: Test method
EN ISO 6508-1, Metallic materials — Rockwell hardness test — Part 1: Test method
ISO 3452-1, Non-destructive testing — Penetrant testing — Part 1: General principles
ISO 5855-2, Aerospace series — MJ threads — Part 2: Limit dimensions for bolts and nuts
2
ASTM E112-13, Standard Test Methods for Determining Average Grain Size
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at http://www.iso.org/obp

1 Maximum test temperature of the parts.
2 Published by: American Society for Testing and Materials (ASTM), 100 Barr Harbor Drive, PO Box C700,
West Conshohocken, PA 19428-2959, USA.
4

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SIST EN 3299:2019
EN 3299:2019 (E)
3.1
finished nut or ring
nut or ring ready for use, inclusive of any possible treatments and/or surface coatings, as specified in
the product standard or definition document
3.2
definition document
document specifying all the requirements for finished nuts or rings
3.3
batch
quantity of finished nuts or rings, of the same type and same diameter, produced from the same
material obtained from the same melt, manufactured in the course of the same production cycle,
following the same manufacturing route and having undergone all the relevant heat treatments and
surface treatments
3.4
production cycle
period during which production proceeds without any voluntary or unforeseen change in
manufacturing parameters
3.5
heat treatment cycle
period during which the oven continuously remains at nominal treatment temperature
3.6
surface treatment cycle
period during which the surface treatment proceeds without any voluntary or unforeseen change in
surface treatment parameters
3.7 Surface discontinuities
3.7.1
crack
rupture in the material which may extend in any direction and which may be intercrystalline or
transcrystalline in character
3.7.2
seam
open surface discontinuity
3.7.3
lap
surface discontinuity caused by folding over metal fins or sharp corners
3.7.4
inclusions
non-metallic particles originating from the material manufacturing process
Note 1 to entry: These particles may be isolated or arranged in strings.
5

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SIST EN 3299:2019
EN 3299:2019 (E)
3.8
sampling plan
plan according to which one or more samples are taken in order to obtain information and possibly
reach a decision
3.9
simple random sampling
taking of n items from a population of N items in such a way that all possible combinations of n items
have the same probability of being chosen
[SOURCE: ISO 3534-2:2006, 1.3.4, modified]
3.10
self-locking torque
torque to be applied to the nut or ring to maintain its movement of rotation in relation to the associated
part, the assembly being under no axial load and the locking zone being completely engaged on the
associated part (minimum protrusion of two pitches, including the end chamfer)
3.11
breakaway torque
torque required to start unscrewing the nut or ring with respect to the associated part, with the locking
zone still fully engaged, but after the axial load in the assembly has been removed by unscrewing half a
turn followed by a halt in rotational movement
3.12
effective seating torque
part of the apparent seating torque which introduces or increases the axial load in the assembly; the
effective seating torque is equal to the difference between the apparent seating torque and the
self-locking torque
3.13
apparent seating torque
torque indicated by the dynamometric wrench when tightening
4 Quality assurance
4.1 Qualification
See EN 9133.
Qualification inspections and tests (requirements, methods, numbers of nuts or rings) are specified in
Table 1. They shall be carried out on
— each type and diameter of nut or ring, and
— 12 nuts or rings selected from a single batch by simple random sampling.
The test programme may possibly be reduced or the qualification be granted without inspection or
testing: any such decision shall be based on the results obtained on similar diameters of nuts or rings,
provided that the design and manufacturing conditions are identical.
Table 2 indicates the allocation of nut or ring samples for the inspections and tests.
6

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SIST EN 3299:2019
EN 3299:2019 (E)
4.1.1 Approval of manufacturers
The manufacturer’s operations shall be an approved production organisation for aerospace products
and shall demonstrate that it has implemented and is able to maintain a quality management system
(e. g. according to EN 9100 or an equivalent aerospace accepted and established quality management
system).
4.1.2 Qualification of screws
The qualification procedure for aerospace standard products (e. g. according to EN 9133 or an
equivalent aerospace accepted and established qualification procedure) shall be used and documented
according to the specified tests if not otherwise agreed between customer and supplier.
4.2 Acceptance
4.2.1 Purpose
The purpose of acceptance inspections and tests is to check, as simply as possible, by a method
representative of actual use conditions, with the uncertainty inherent to statistical sampling, that the
nuts or rings constituting the batch satisfy the requirements of this document.
4.2.2 Conditions
Acceptance inspections and tests (requirements, methods, numbers of nuts or rings) are specified in
Table 1. They shall be carried out on each batch. Nuts or rings from the batch to be tested shall be
selected by simple random sampling.
Each nut or ring may be submitted to several inspections or tests.
If a more stringent inspection is deemed necessary, all or part of the qualification inspections and tests
may be performed during the acceptance inspection and testing. In this case, the sample submitted to
these inspections and tests is the same as that submitted for qualification inspection and tests.
4.2.3 Responsibility
Acceptance inspections and tests shall be carried out by the manufacturer, or under his responsibility.
4.2.4 Inspection and test report
A test report showing actual numerical values shall be provided if specified in the purchase order.
5 Requirements
See Table 1.
7

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SIST EN 3299:2019
EN 3299:2019 (E)
Table 1 — Technical requirements and test methods
a
Clause Characteristic Requirement Inspection and test Sample
Q/A
method size
Material Q
5.1 In accordance with the product Chemical analysis or
standard or definition certificate of compliance
A

document. issued by the
manufacturer of the
semi-finished product
Dimensions, Q 9
5.2 In accordance with the product Standard gauging
tolerances of
standard or definition
A Table 3

form and
document.
position
Manufacturing Q
5.3 The nuts or rings shall be Examination of the
manufactured by machining. manufacturing process


Heat treatment Q
5.3.1 The heat treatment medium or Examination of the heat
atmosphere shall not cause treatment equipment


any surface contamination
except as permitted by 5.5.4.
Q
 Solution treat (if applicable) at Examination of the heat
a temperature of 900 °C to treatment process


980 °C held at the selected
temperature within ±15 °C for
between 1 h min. and 2 h max.
quench in oil, or alternative
medium or faster.
Precipitation treat at
(720 ± 10) °C held at
temperature for
16 h −0 +30 minutes cooled in
air or faster process.

 Any scale shall be removed by Visual examination
mechanical or chemical pro-
cesses. It shall not deteriorate
the dimensions, surface finish
and mechanical properties of
the parts. In particular, it shall
not result in embrittlement of
the metallic substrate.
Bearing Q 3
5.3.2 In accordance with the product See Annex A.
surface per-
standard or definition
A Table 3

pendicularity
document.
8

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SIST EN 3299:2019
EN 3299:2019 (E)
a
Clause Characteristic Requirement Inspection and test Sample
Q/A
method size
Threads and Q 9
5.3.3 Threads in the locking region
thread
may be deformed in any
A Table 3

deformation
manner provided that the nut
or ring meets the require-
ments of this European
standard.

 A tool mark and distortion are Visual examination
permissible in the locking area.
The marks must be without
any abrupt changes.

...