SIST EN 4048:2005
(Main)Aerospace series - Nuts, self-locking, MJ threads, in heat resisting nickel base alloy NI-PH2601 (Inconel 718), MoS2 coated - Classification: 1 550 MPa (at ambient temperature) / 425 °C - Technical specification
Aerospace series - Nuts, self-locking, MJ threads, in heat resisting nickel base alloy NI-PH2601 (Inconel 718), MoS2 coated - Classification: 1 550 MPa (at ambient temperature) / 425 °C - Technical specification
This standard specifies the characteristics, qualification and acceptance requirements for self-locking nuts with MJ threads in NI-PH2601, MoS2 coated, for aerospace applications.
Classification: 1 550 MPa ) / 425 °C )
It is applicable whenever referenced.
Luft- und Raumfahrt - Muttern, selbstsichernd, MJ-Gewinde, aus hochwarmfester Nickelbasislegierung NI-PH2601 (Inconel 718), MoS2-beschichtet - Klasse: 1 550 MPa (bei Raumtemperatur) / 425 °C - Technische Lieferbedingungen
Diese Norm legt die Eigenschaften sowie die Qualifikations- und Annahmebedingungen für selbstsichernde Muttern mit MJ-Gewinde aus NI-PH2601, MoS2-beschichtet, fest.
Klasse: 1 550 MPa ) / 425 °C )
Sie ist immer dann anzuwenden, wenn auf sie verwiesen wird.
Série aérospatiale - Écrous, a freinage interne, a filetage MJ, en alliage résistant a chaud a base de nickel NI-PH2601 (Inconel 718), revetus MoS2 - Classification : 1 550 MPa (a température ambiante) / 425 °C - Spécification technique
La présente norme spécifie les caractéristiques, les exigences de qualification et de réception des écrous a freinage interne a filetage MJ en NI-PH2601, revetus MoS2, pour applications aérospatiales.
Classification : 1 550 MPa ) / 425 °C )
Elle est applicable chaque fois qu'elle est citée en référence.
Aerospace series - Nuts, self-locking, MJ threads, in heat resisting nickel base alloy NI-PH2601 (Inconel 718), MoS2 coated - Classification: 1 550 MPa (at ambient temperature) / 425 °C - Technical specification
General Information
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Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 4048:2005
01-junij-2005
1DGRPHãþD
SIST EN 4048:2004
Aerospace series - Nuts, self-locking, MJ threads, in heat resisting nickel base
alloy NI-PH2601 (Inconel 718), MoS2 coated - Classification: 1 550 MPa (at ambient
temperature) / 425 °C - Technical specification
Aerospace series - Nuts, self-locking, MJ threads, in heat resisting nickel base alloy NI-
PH2601 (Inconel 718), MoS2 coated - Classification: 1 550 MPa (at ambient
temperature) / 425 °C - Technical specification
Luft- und Raumfahrt - Muttern, selbstsichernd, MJ-Gewinde, aus hochwarmfester
Nickelbasislegierung NI-PH2601 (Inconel 718), MoS2-beschichtet - Klasse: 1 550 MPa
(bei Raumtemperatur) / 425 °C - Technische Lieferbedingungen
Série aérospatiale - Écrous, a freinage interne, a filetage MJ, en alliage résistant a chaud
a base de nickel NI-PH2601 (Inconel 718), revetus MoS2 - Classification : 1 550 MPa (a
température ambiante) / 425 °C - Spécification technique
Ta slovenski standard je istoveten z: EN 4048:2004
ICS:
49.030.30 Matice Nuts
SIST EN 4048:2005 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 4048:2005
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SIST EN 4048:2005
EUROPEAN STANDARD
EN 4048
NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2004
ICS 49.030.30 Supersedes EN 4048:2003
English version
Aerospace series - Nuts, self-locking, MJ threads, in heat
resisting nickel base alloy NI-PH2601 (Inconel 718), MoS2
coated - Classification: 1 550 MPa (at ambient temperature) /
425 °C - Technical specification
Série aérospatiale - Écrous, à freinage interne, à filetage Luft- und Raumfahrt - Muttern, selbstsichernd, MJ-
MJ, en alliage résistant à chaud à base de nickel NI- Gewinde, aus hochwarmfester Nickelbasislegierung NI-
PH2601 (Inconel 718), revêtus MoS2 - Classification : 1 PH2601 (Inconel 718), MoS2-beschichtet - Klasse: 1 550
550 MPa (à température ambiante) / 425 °C - Spécification MPa (bei Raumtemperatur) / 425 °C - Technische
technique Lieferbedingungen
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
under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, 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
© 2004 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 4048:2004: E
worldwide for CEN national Members.
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SIST EN 4048:2005
EN 4048:2004 (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.7
4.2.3 Responsibility.7
4.2.4 Inspection and test report.7
5 Requirements.8
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SIST EN 4048:2005
EN 4048:2004 (E)
Foreword
This document EN 4048:2004 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 Standard shall be given the status of a national standard, either by publication of an identical
text or by endorsement, at the latest by May 2005, and conflicting national standards shall be withdrawn at
the latest by May 2005.
This document supersedes EN 4048:2003.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland
and the United Kingdom.
3
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SIST EN 4048:2005
EN 4048:2004 (E)
1 Scope
This standard specifies the characteristics, qualification and acceptance requirements for self-locking nuts with
MJ threads in NI-PH2601, MoS coated, for aerospace applications.
2
1) 2)
Classification: 1 550 MPa / 425 °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 1463, Metallic and oxide coatings – Measurement of coating thickness – Microscopical method
ISO 2859-1, Sampling procedures for inspection by attributes – Part 1: Sampling schemes indexed by
acceptance quality limit (AQL) for lot-by-lot inspection
ISO 3452, Non-destructive testing – Penetrant inspection – General principles
ISO 4288, Geometrical Product Specifications (GPS) – Surface texture: Profile method – Rules and
procedures for the assessment of surface texture
ISO 5855-2, Aerospace – MJ threads – Part 2: Limit dimensions for bolts and nuts
ISO 8642, Aerospace – Self-locking nuts with maximum operating temperature greater than 425 °C – Test
methods
EN 2491, Aerospace series – Molybdenum disulphide dry lubricants – Coating methods
EN 9133, Aerospace series – Quality management systems – Qualifiation Procedure for Aerospace
3)
Standard Parts
4)
ASTM E112-96, 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
batch
quantity of finished parts, 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
3.2
inspection lot
quantity of parts from a single production batch with the same part number which completely defines the part
1) Correspond to the minimum tensile stress which the nut is able to withstand at ambient temperature without breaking
or cracking when tested with a bolt of a higher strength class.
2) Maximum test temperature of the parts
3) Published as AECMA Prestandard at the date of publication of this standard
4) Published by: American Society for Testing and Materials (ASTM), 1916, Race Street, Philadelphia, PA 19103, USA
4
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SIST EN 4048:2005
EN 4048:2004 (E)
3.3 Surface discontinuities
3.3.1
crack
rupture in the material which may extend in any direction and which may be intercrystalline or transcrystalline
in character
3.3.2
seam
open surface defect
3.3.3
lap
surface defect caused by folding over metal fins or sharp corners and then rolling or forging them into the
surface
3.3.4
inclusions
non-metallic particles originating from the material manufacturing process. These particles may be isolated
or arranged in strings.
3.4
test temperature
ambient temperature unless otherwise specified
3.5
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
3.6
critical defect
a defect that, according to judgement and experience, is likely to result in hazardous or unsafe conditions for
individuals using, maintaining, or depending upon the considered product, or that is likely to prevent
performance of the function of a major end item
3.7
major defect
a defect other than critical, that is likely to result in a failure or to reduce materially the usability of the
considered product for its intended purpose
3.8
minor defect
a defect that is not likely to reduce materially the usability of the considered product for its intended purpose,
or that is a departure from established specification having little bearing on the effective use or operation of
this product
3.9
sampling plan
a plan according to which one or more samples are taken in order to obtain information and possibly to reach
a decision
3.10
limiting quality (LQ )
10
in a sampling plan, the quality limit which corresponds to a specified 10 % probability of acceptance
3.11
acceptance quality limit (AQL)
a quality limit which in a sampling plan corresponds to a specified but relatively high probability of
acceptance
It is the maximum per cent defective (or the maximum number of defects per hundred units) that, for
purposes of sampling inspection can be considered satisfactory as a process average.
5
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SIST EN 4048:2005
EN 4048:2004 (E)
3.12
finished nut
a nut ready for use, inclusive of any possible treatments and/or surface coatings, as specified in the product
standard or definition document
3.13
definition document
document specifying all the requirements for finished nuts
3.14
self-locking torque
the torque to be applied to the nut or bolt to maintain movement of rotation in relation to the associated part,
the assembly being under no axial load and the nut locking system being completely engaged with the bolt
(minimum protrusion of two pitches including end chamfer)
3.15
seating torque
the tightening torque to be applied to the nut or bolt to introduce or to increase the axial load in the assembly
3.16
unseating torque
the untightening torque to be applied to the nut or bolt to reduce or remove the axial load in the assembly
3.17
breakaway torque
the torque required to start unscrewing the nut or bolt with respect to the associated part, with the nut locking
device still fully engaged on the bolt, but after the axial load in the assembly has been removed by
unscrewing half a turn followed by a halt in rotational movement
3.18
wrench feature torque
the torque to be applied to the wrenching feature of the nut
4 Quality assurance
4.1 Qualification
EN 9133
Qualification inspections and tests (requirements, methods, numbers of nuts) are specified in Table 1. They
shall be carried out on:
each type and diameter of nut;
46 nuts selected from a single inspection lot by simple random sampling.
The test programme may possibly be reduced, or the qualification of a nut be granted without inspection or
testing. Any such decision shall be based on the results obtained on similar types and diameters of nuts
provided that the design and manufacturing conditions are identical.
Table 2 indicates the allocation of nut 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
constituting the batch satisfy the requirements of this standard.
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SIST EN 4048:2005
EN 4048:2004 (E)
4.2.2 Conditions
Acceptance inspections and tests (requirements, methods, numbers of nuts) are specified in Table 1; they
shall be carried out on each production batch or inspection lot. Nuts from the batch or lot to be tested shall
be selected by simple random sampling.
Each nut 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 number of nuts 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.
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SIST EN 4048:2005
EN 4048:2004 (E)
5 Requirements
See Table 1.
Table 1 — Technical requirements and test methods
a
Clause Characteristic Requirement Inspection Q/A Sample
and test method size
5.1 Material In accordance with the
Chemical analysis or Q
product standard or definition certificate of conformity
A
document issued by the manufacturer of
the semi-finished product
5.2 Dimensions, In accordance with the Standard gauging Q 43
tolerances and product standard or definition
A Tables
tolerances of document
3 and 4
form and position
5.3 Manufacturing
5.3.1 Forming Nuts shall be formed by a hot The method of forming shall Q
or cold forming process. be indicated.
If hot formed, the forming
temperature shall not exceed
1 150 °C and they shall be air
cooled or faster.
The equipment shall ensure a
uniform temperature
throughout the production
batch.
5.3.2 Heat treatment The heat treatment medium Calibration of the heat Q
or atmosphere shall not treatment equipment shall be
cause any surface confirmed.
contamination except as
permitted by 5.5.4.
Any scale which will not be Visual examination
removed by subsequent
machining shall be removed
by abrasive blasting with an
appropriate equipment.
Solution treat (if applicable) Examination of the heat
at a temperature of 950 °C to treatment specification
980 °C, hold 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 treatment at
(720 ± 5) °C, held at
temperature for 8 h ± 15 min,
furnace cooled at (55 ± 5) °C
per hour to (620 ± 5) °C, held
at 620 °C for 8 h ± 5 min,
followed by air cooling or
faster.
Instead of the 55 °C per hour
cooling rate to 620 °C, parts
may be furnace cooled at any
rate provided the time at
620 °C is adjusted to give a
total precipitation time of
18 h min.
continued
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SIST EN 4048:2005
EN 4048:2004 (E)
Table 1 (continued)
a
Clause Characteristic Requirement Inspection Q/A Sample
and test method size
5.3.3 Bearing surface In accordance with the ISO 8642 Q 43
perpendicularity product standard or definition
document
A Tables
3 and 4
For non-floating plate nuts
having a bearing surface
exceeding × 1,5 the thread
nominal diameter, the
perpendicularity requirement
shall, unless otherwise
specified by the product
standard or definition
document, apply only to that
portion of
...
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