SIST EN 3299:2009

SLOVENSKI STANDARD
SIST EN 3299:2009
01-junij-2009
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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 3299:2007
ICS:
49.030.30 Matice Nuts
49.030.50 Podložke in drugi blokirni Washers and other locking
elementi elements
SIST EN 3299:2009 en,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 3299:2009

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SIST EN 3299:2009
EUROPEAN STANDARD
EN 3299
NORME EUROPÉENNE
EUROPÄISCHE NORM
July 2007
ICS 49.030.30; 49.030.50

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, à Luft- und Raumfahrt - Wellenmuttern und Gewinderinge,
freinage interne, filetage MJ à droite ou à gauche, en acier selbstsichernd, Rechts- oder Links-MJ-Gewinde, aus
résistant à chaud FE-PA2601 (A286), argentés - hochwarmfestem Stahl FE-PA2601 (A286), versilbert -
Spécification technique Technische Lieferbedingungen
This European Standard was approved by CEN on 28 August 2006.
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, 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.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2007 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 3299:2007: E
worldwide for CEN national Members.

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SIST EN 3299:2009
EN 3299:2007 (E)
Contents Page
Foreword.3
1 Scope .4
2 Normative references .4
3 Terms and definitions .4
4 Quality assurance.6
4.1 Qualification .6
4.2 Acceptance.6
4.2.1 Purpose.6
4.2.2 Conditions .6
4.2.3 Responsibility .7
4.2.4 Inspection and test report.7
5 Requirements.7
Annex A (normative) Checking bearing surface perpendicularity .13
A.1 Inspection device.13
A.2 Procedure .13
A.3 Results to be obtained .13
Annex B (normative) Method of checking locking torque.16
B.1 Inspection device.16
B.2 Procedure .16
B.3 Results to be obtained .16
Annex C (normative) Hardness test.18
C.1 Choice of method.18
C.2 Procedure .18

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SIST EN 3299:2009
EN 3299:2007 (E)
Foreword
This document (EN 3299:2007) 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 2008, and conflicting national standards shall be withdrawn at
the latest by January 2008.
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, 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 the United Kingdom.
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SIST EN 3299:2009
EN 3299:2007 (E)
1 Scope
This 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 referenced documents are indispensable for the application 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.
ISO 3452, Non-destructive testing — Penetrant inspection — General principles.
ISO 3534:1977, Statistics — Vocabulary and symbols.
ISO 5855-2, Aerospace — MJ threads — Part 2: Limit dimensions for bolts and nuts.
EN ISO 4288, Geometrical Product Specifications (GPS) — Surface texture: Profile method — Rules and
procedures for the assessment of surface texture (ISO 4288:1996).
EN ISO 6507-1, Metallic materials — Vickers hardness test — Part 1: Test method (ISO 6507-1:2005).
EN ISO 6508-1, Metallic materials — Rockwell hardness test — Part 1: Test method (scales A, B, C, D, E, F,
G, H, K, N, T) (ISO 6508-1:2005).
2)
EN 2786, Aerospace series — Electrolytic silver plating of fasteners.
EN 9133, Aerospace series — Quality management systems — Qualification procedure for aerospace
standard parts.
3)
ASTM E 112-88, Standard Test Methods for Determining Average Grain Size.
3 Terms and definitions
For the purposes of this standard, the following terms and definitions apply.
3.1
finished nut or ring
a nut or ring ready for use, inclusive of any possible treatments and/or surface coatings, as specified in the
product standard or definition document

1) Maximum test temperature of the parts.
2) Published as ASD Prestandard at the date of publication of this standard.
3) Published by: American Society for Testing and Materials (ASTM), 100 Barr Harbor Drive, PO Box C700, West
Conshohocken, PA 19428-2959, USA.
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SIST EN 3299:2009
EN 3299:2007 (E)
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 defect
3.7.3
lap
surface defect caused by folding over metal fins or sharp corners
3.7.4
inclusions
non-metallic particles originating from the material manufacturing process
These particles may be isolated or arranged in strings.
3.8
sampling plan
a plan according to which one or more samples are taken in order to obtain information and possibly reach a
decision
[ISO 3534, see definition]
3.9
simple random sampling
the 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
[ISO 3534, see definition]
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SIST EN 3299:2009
EN 3299:2007 (E)
3.10
self-locking torque
the 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
the 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
the torque indicated by the dynamometric wrench when tightening
4 Quality assurance
4.1 Qualification
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;
 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.
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 standard.
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.
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SIST EN 3299:2009
EN 3299:2007 (E)
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.
Table 1 — Technical requirements and test methods
a
Clause Characteristic Requirement Inspection and test method Sample
Q/A
size
5.1  Material In accordance with the product Chemical analysis or Q
standard or definition document certificate of compliance

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

A Table 3
form and
position
5.3  Manufacturing The nuts or rings shall be Examination of the Q
manufactured by machining. manufacturing process

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

surface contamination except as
permitted by 5.5.4.
  Solution treat (if applicable) at a Examination of the heat Q
temperature of 900 °C to 980 °C treatment process

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
...