EN 3685:2019

SLOVENSKI STANDARD
01-december-2019
Nadomešča:
SIST EN 3685:2008
Aeronavtika - Sorniki iz toplotnoodpornega jekla FE-PA2601 (A286) - Klasifikacija:
1100 MPa/650 °C - Tehnična specifikacija
Aerospace series - Bolts in heat resisting steel FE-PA2601 (A286) - Classification: 1 100
MPa/650 °C - Technical specification
Luft- und Raumfahrt - Schrauben aus hochwarmfestem Stahl FE-PA2601 (A286) -
Klasse: 1 100 MPa/650 °C - Technische Lieferbedingungen; Deutsche und Englische
Fassung EN 3685:2008
Série aérospatiale - Vis en acier résistant à chaud FE-PA2601 (A286) - Classification : 1
100 MPa/650 °C - Spécification technique
Ta slovenski standard je istoveten z: EN 3685:2019
ICS:
21.060.10 Sorniki, vijaki, stebelni vijaki Bolts, screws, studs
49.025.10 Jekla Steels
49.030.20 Sorniki, vijaki, stebelni vijaki Bolts, screws, studs
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 3685
EUROPEAN STANDARD
NORME EUROPÉENNE
August 2019
EUROPÄISCHE NORM
ICS 49.030.20 Supersedes EN 3685:2008
English Version
Aerospace series - Bolts in heat resisting steel FE-PA2601
(A286) - Classification: 1 100 MPa/650 °C - Technical
specification
Série aérospatiale - Vis en acier résistant à chaud FE- Luft- und Raumfahrt - Schrauben aus hochwarmfestem
PA2601 (A286) - Classification : 1 100 MPa/650 °C - Stahl FE-PA2601 (A286) - Klasse: 1 100 MPa/650 °C -
Spécification technique 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 3685:2019 E
worldwide for CEN national Members.

Contents
Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 5
4 Certification and quality assurance . 7
4.1 Qualification . 7
4.1.1 Purpose . 7
4.1.2 Conditions . 7
4.1.3 Qualification test requirements and procedures . 7
4.1.4 Qualified manufacturers . 7
4.2 Acceptance . 7
4.2.1 Purpose . 7
4.2.2 Conditions . 8
4.3 Quality system certification . 8
4.3.1 Purpose . 8
4.3.2 Requirements and procedure . 8
4.4 Responsibility for inspection and tests . 8
4.5 Inspection and test report . 8
5 Technical requirements and test methods . 9
Bibliography . 29

European foreword
This document (EN 3685:2019) 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 February 2020, and conflicting national standards
shall be withdrawn at the latest by February 2020.
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.
This document supersedes EN 3685:2008.
According to the CEN-CENELEC Internal Regulations, the national standards organisations 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.
1 Scope
This European standard specifies the technical specification, qualification and quality assurance
requirements for bolts in material FE–PA2601 (A286) of tensile strength class 1 100 MPa at room
temperature, maximum test temperature of material 650 °C.
Primarily for aerospace applications it is applicable to such bolts when referenced on the product
standard or definition document.
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 3041, Aerospace series — Propulsion standard parts — Manufacturing process change procedure for
qualified parts
EN 3761, Aerospace series — Heat resisting alloy FE-PA2601 — Softened and cold worked — Bar for
forged fasteners — D ≤ 50 mm — 1 100 MPa ≤ R ≤ 1 300 MPa
m
EN ISO 3452-1, Non-destructive testing — Penetrant testing — Part 1: General principles
EN ISO 4288, Geometrical product specifications (GPS) — Surface texture: Profile method — Rules and
procedures for the assessment of surface texture
EN ISO 6508-1, Metallic materials — Rockwell hardness test — Part 1: Test 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 7961, Aerospace series — Bolts — Test methods
ASD-STAN/TR 3040-1, Aerospace series — Quality assurance — EN aerospace products — Part 1: List of
approved manufacturers
ASD-STAN/TR 3775, Bolts and pins — Materials
ASTM E112, Standard Test Methods for Determining Average Grain Size

1 In preparation at the date of publication of this European standard (www.asd-stan.org).
2 Published as ASD-STAN-Prestandard at the date of publication of this European standard by AeroSpace and Defence
Industries Association of Europe – Standardization (ASD-STAN) (www.asd-stan.org).
3 Published as ASD-STAN Technical Report at the date of publication of this European standard by AeroSpace and Defence
Industries Association of Europe – Standardization (ASD-STAN) (www.asd-stan.org).
4 Published by: ASTM International, 100 Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, USA.
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:
 ISO Online browsing platform: available at http://www.iso.org/obp
 IEC Electropedia: available at http://www.electropedia.org/
3.1
production batch
quantity of finished parts fabricated by the same process from a single material cast (single heat of
alloy), having the same basic part number and diameter, heat treated together to the same specified
condition and produced as one continuous run
3.2
inspection lot
quantity of parts from a single production batch of the same part number which completely defines the
parts
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
longitudinal surface discontinuity in the form of an unwelded open fold in the material
3.3.3
lap
surface discontinuity caused by folding over metal fins or sharp corners and then rolling or forging
them into the surface
3.3.4
inclusion
non-metallic particles originating from the material manufacturing process
Note 1 to entry: These particles may be isolated or arranged in strings extending longitudinally.
3.4
test temperature
ambient temperature, unless otherwise specified
3.5
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
3.6
critical defect
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
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
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
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
quality level in a sampling plan, which corresponds to a specified and relatively low probability of
acceptance, in this case 10 % probability of acceptance
Note 1 to entry: It is the limiting lot quality characteristic that a lot of this quality would occur.
3.11
Acceptance Quality Limit
AQL
quality limit which in a sampling plan corresponds to a specified but relatively high probability of
acceptance
Note 1 to entry: 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.
3.12
finished bolt
bolt ready for use, inclusive of any possible treatments and/or surface coatings, as specified in the
dimensional standard or definition document
4 Certification and quality assurance
4.1 Qualification
4.1.1 Purpose
The purpose of qualification tests is to ensure that the bolt design and bolt manufacturing conditions
allow the bolt to comply with the requirements of this document.
4.1.2 Conditions
The qualification tests summarized in Table 3 shall be performed on each type and diameter of bolt.
Proposed changes in manufacturing source or procedure shall be subject to the requirements of
EN 3041.
25 bolts selected from a single inspection lot by simple random sampling shall be subjected to the
qualification tests.
The number of bolts to be subjected to each test as well as the method(s) to be used are specified in
Table 1.
The tests to be applied to each bolt are shown in Table 4.
The test programme may possibly be reduced, this decision
...