SIST EN 4853:2022

Aerospace series - Externally threaded fastener, 100° countersunk normal head, Spiral Drive Recess - Classification: 1 100 MPa (at ambient temperature)/425 °C

This document specifies the characteristics of externally threaded fasteners, 100° countersunk normal head, Spiral Drive Recess, for aerospace applications.
Classification: 1 100 MPa /425 °C .

Luft- und Raumfahrt - Verbindungselement mit Außengewinde, 100° Senkkopf, mit Spiral-Antrieb - Klasse: 1 100 MPa (bei Raumtemperatur)/425 °C

Dieses Dokument legt die Eigenschaften von Verbindungselementen mit Außengewinde, 100° Senkkopf-schrauben mit Spiral-Antrieb für Anwendungen in der Luft- und Raumfahrt fest.
Klasse: 1 100 MPa /425 °C .

Série aérospatiale - Élement de fixation à filetage extérieur, tête fraisée normale 100°, empreinte en spirale - Classification : 1 100 MPa (à température ambiante)/425 °C

Le présent document spécifie les caractéristiques des éléments de fixation à filetage extérieur, à tête fraisée normale 100°, empreinte en spirale, pour les applications aérospatiales.
Classification : 1 100 MPa/425 °C.

Aeronavtika - Spojni elementi z zunanjim navojem, 100° ugrezna glava, spiralna vdolbina - Klasifikacije: 1 100 MPa (pri temperaturi okolice)/425 °C

Ta dokument določa značilnosti zunanjih navojnih veznih elementov – 100° ugrezna glava, spiralna vdolbina – za uporabo v aeronavtiki.
Klasifikacija: 1100 MPa/425 °C.

General Information

• Status: Published
• Publication Date: 05-Apr-2022
• ICS: 49.030.01 - Fasteners in general
• Technical Committee: I13 - Imaginarni 13
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 30-Mar-2022
• Due Date: 04-Jun-2022
• Completion Date: 06-Apr-2022
• Ref Project: EN 4853:2022 - Aerospace series - Externally threaded fastener, 100° countersunk normal head, Spiral Drive Recess - Classification: 1 100 MPa (at ambient temperature)/425 °C

Overview

EN 4853:2022 is a CEN (ASD-STAN) aerospace standard that specifies the characteristics of externally threaded fasteners with a 100° countersunk normal head and a Spiral Drive Recess. It defines the classification 1 100 MPa (at ambient temperature) / 425 °C, i.e. the minimum tensile-strength class and the maximum service temperature. The standard covers dimensional requirements, surface finish, marking, testing and technical specification essentials for aerospace assemblies using these countersunk fasteners.

Key topics and technical requirements

• Fastener geometry and dimensions: Detailed head, recess and grip-length dimensions (see Figure 1, Tables 1–3). Dimensions and tolerances are expressed in millimetres and apply after surface treatment. Threads conform to UNJ/UNJF requirements (ISO 3161, ISO 3353-1).
• Recess / drive type: Spiral Drive Recess (MORTORQ® referenced) - geometrical definition and requirements align with EN 4609. Note: the document records a possible patent (EP1025370B1) associated with the Spiral Drive System.
• Mechanical classification: Classification 1 100 MPa / 425 °C (minimum tensile strength at ambient temperature and maximum temperature without permanent change).
• Surface finish and roughness: Specified Ra max values - bearing surfaces (underhead, fillet, shank, thread) Ramax = 0.8 µm; all other surfaces Ramax = 3.2 µm; edge breaks 0.1–0.4 mm.
• Materials and treatments: References to applicable material specifications (steel, titanium, heat-resisting alloys) and surface treatments including cadmium, passivation and dry-film lubricants (see normative references EN 2133, EN 2516, EN 2491, EN 3021).
• Quality controls and tests: Requirements for marking, designation, fatigue testing, oversize bolts, and gauging (countersink/head protrusion per NAS9800).

Applications and who uses it

EN 4853:2022 is intended for:

• Aerospace fastener manufacturers producing 100° countersunk, spiral-drive externally threaded fasteners
• Aircraft OEMs and Tier suppliers specifying fasteners for structural, aerodynamic or flush-mounted joints
• Procurement and quality engineering teams requiring compliant part definition, marking and acceptance criteria
• Maintenance, repair and overhaul (MRO) organizations verifying replacement fasteners and service limits (including high-temperature exposure up to 425 °C)

Typical applications include flush-mounted structural joints, skin panels and aerodynamic surfaces where countersunk heads and high-strength, temperature-resistant fasteners are required.

Related standards

Key normative references include:

• EN 4609 (Spiral drive recess geometry)
• ISO 3161 / ISO 3353-1 (UNJ/UNJF and rolled thread requirements)
• EN 2133, EN 2516, EN 2491, EN 3021 (surface treatments and lubricants)
• NAS/SAE/EN material and fastener specifications cited in the standard

Keywords: EN 4853:2022, aerospace fasteners, 100° countersunk, Spiral Drive Recess, MORTORQ, UNJ threads, fastener classification, high-temperature fasteners.

Standards Content (Sample)

SLOVENSKI STANDARD
01-maj-2022
Aeronavtika - Spojni elementi z zunanjim navojem, 100° ugrezna glava, spiralna
vdolbina - Klasifikacije: 1 100 MPa (pri temperaturi okolice)/425 °C
Aerospace series - Externally threaded fastener, 100° countersunk normal head, Spiral
Drive Recess - Classification: 1 100 MPa (at ambient temperature)/425 °C
Luft- und Raumfahrt - Verbindungselement mit Außengewinde, 100° Senkkopf, mit
Spiral-Antrieb - Klasse: 1 100 MPa (bei Raumtemperatur)/425 °C
Série aérospatiale - Élement de fixation à filetage extérieur, tête fraisée normale 100°,
empreinte en spirale - Classification : 1 100 MPa (à température ambiante)/425 °C
Ta slovenski standard je istoveten z: EN 4853:2022
ICS:
49.030.01 Vezni elementi na splošno Fasteners in general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 4853
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2022
EUROPÄISCHE NORM
ICS 49.030.01
English Version
Aerospace series - Externally threaded fastener, 100°
countersunk normal head, Spiral Drive Recess -
Classification: 1 100 MPa (at ambient temperature)/425
°C
Série aérospatiale - Élement de fixation à filetage Luft- und Raumfahrt - Verbindungselement mit
extérieur, tête fraisée normale 100°, empreinte en Außengewinde, 100° Senkkopf, mit Spiral-Antrieb -
spirale - Classification : 1 100 MPa (à température Klasse: 1 100 MPa (bei Raumtemperatur)/425 °C
ambiante)/425 °C
This European Standard was approved by CEN on 10 January 2022.

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
© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 4853:2022 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 6
4 Requirements . 7
4.1 Configuration — Dimensions . 7
4.2 Tolerances of form and position . 13
4.3 Materials . 14
4.4 Surface treatment . 14
5 Oversize bolts . 15
6 Designation . 17
7 Marking . 17
8 Fatigue testing . 17
9 Technical specification . 18
Bibliography. 19

European foreword
This document (EN 4853:2022) 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 September 2022, and conflicting national standards shall
be withdrawn at the latest by September 2022.
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.
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, Former Yugoslav Republic of Macedonia, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands,
Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
the United Kingdom.
Introduction
Aerospace and Defence Standardisation (ASD-STAN) draws attention to the fact that it is claimed that
compliance with this document may involve the use of a patent “Spiral Drive System for Threaded
Fasteners” EP1025370B1.
ASD-STAN takes no position concerning the evidence, validity and scope of this patent right.
The holder of this patent right has assured ASD-STAN that he/she is willing to negotiate licences under
reasonable and non-discriminatory terms and conditions with applicants throughout the world. In this
respect, the statement of the holder of this patent right is registered with ASD-STAN. Information may be
obtained from:
Phillips Screw Company
301 Edgewater Drive, Suite 320
Wakefield, Massachusetts 01880
USA
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights other than those identified above. ASD-STAN shall not be held responsible for identifying
any or all such patent rights.
1 Scope
This document specifies the characteristics of externally threaded fasteners, 100° countersunk normal
head, Spiral Drive Recess, for aerospace applications.
1 2
Classification: 1 100 MPa /425 °C .
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 2133, Aerospace series — Cadmium plating of steels with specified tensile strength ≤ 1 450 MPa, copper,
copper alloys and nickel alloys
EN 2137, Aerospace series — Steel FE-PL75 — 1 100 MPa ≤ Rm ≤ 1 250 MPa — Bars — De ≤ 100 mm
EN 2424, Aerospace series — Marking of aerospace products
EN 2491, Aerospace series — Molybdenum disulphide dry lubricants — Coating methods
EN 2516, Aerospace series — Passivation of corrosion resisting steels and decontamination of nickel base
alloys
EN 3021, Aerospace series — Molybdenum disulphide dry film lubricants graphite and halogen free —
Technical specification
EN 3514, Steel FE-PL711 — hardened and tempered — 1 100 ≤ Rm ≤ 1 300 MPa — Bar and wire for
bolts — De ≤ 25 mm
EN 3761, Aerospace series — Heat resisting alloy FE-PA2601 — Softened and cold worked — Bar for forged
fasteners — D ≤ 50 mm — 1 100 MPa ≤ Rm ≤ 1300 MPa
EN 3813, Aerospace series — Titanium alloy TI-P64001 (Ti-6Al-4V) — Annealed — Bar and wire for forged
fasteners — De ≤ 50 mm
EN 4473, Aerospace series — Aluminium pigmented coatings for fasteners — Technical specification
EN 4609, Aerospace series — Spiral drive recesses for threaded fasteners — Geometrical definition and
technical requirements
ISO 3161, Aerospace — UNJ threads — General requirements and limit dimensions
ISO 3353-1, Aerospace — Lead and runout threads — Part 1: Rolled external threads
ISO 7913, Aerospace — Bolts and screws, metric — Tolerances of form and position

Minimum tensile strength of the material at ambient temperature.
Maximum temperature that the screw can withstand without continuous change in its original characteristics,
after return to ambient temperature. The maximum temperature is determined by the material.
Published as ASD-STAN Prestandard at the date of publication of this standard by AeroSpace and Defence
Industries Association of Europe — Standardization (ASD-STAN) (www.asd-stan.org).
NAS621, Fasteners, Titanium Alloy Procurement Specification
NAS4002, Fastener, Alloy Steel, Externally Threaded, 160 KSI Ftu, 95 KSI Fsu, 450 °F
NAS4003, Fastener, A286 Corrosion Resistant Alloy, Externally Threaded, 160 KSI Ftu, 95 KSI Fsu, 1 000 °F
NAS4004, Fastener, 6AL-4V Titanium Alloy, Externally Threaded, 160 KSI Ftu, 95 KSI Fsu, 450 °F
NAS9800, Head Protrusion Gaging, 100° Flush Head Fasteners, Gage Block, Gage Diameters and Stylus4
SAE AMS4928W, Titanium Alloy Bars, Wire, Forgings, Rings, and Drawn Shapes, 6Al — 4V Annealed
SAE AMS4967M, Titanium Alloy, Bars, Wire, Forgings, and Rings 6.0Al — 4.0V Annealed, Heat Treatable
SAE AMS5731L, Steel, Corrosion and Heat-Resistant, Bars, Wire, Forgings, Tubing, and Rings 15Cr —
25.5Ni — 1.2Mo — 2.1Ti — 0.006B — 0.30V Consumable Electrode Melted, 1 800 °F (982 °C) Solution Heat
Treated
SAE AMS5732J, Steel, Corrosion and Heat-Resistant, Bars, Wires, Forgings, Tubing, and Rings, 15Cr —
25.5Ni — 1.2Mo — 2.1Ti — 0.006B — 0.30V Consumable Electrode Melted 1 800°F (982 °C) Solution and
Precipitation Heat Treated
SAE AMS5737G, Steel, Corrosion and Heat Resistant, Bars, Wire, Forgings, and Tubing 15Cr — 25.5Ni —
1.2Mo — 2.1Ti — 0.006B — 0.30V Consumable Electrode Melted 1 650 °F (899 °C) Solution and
Precipitation Heat Treated
SAE AMS5853D, Steel, Corrosion and Heat-Resistant, Bars and Wire 15Cr — 25.5Ni — 1.2Mo — 2.1Ti —
0.006B — 0.30V, Consumable Electrode Melted, 1 800 °F (982 °C) Solution Treated and Work-Strengthened
Capable of 160 ksi (1 103 MPa) Tensile Strength
SAE AMS6322R, Steel Bars, Forgings, and Rings 0.50Cr — 0.55Ni — 0.25Mo (0.38 — 0.43C) (SAE 8740)
SAE AMS6382R, Steel, Bars, Forgings, and Rings 0.95Cr — 0.20Mo (0.38 — 0.43C) (SAE 4140) Annealed
SAE AMS6415U, Steel, Bars, Forgings, and Tubing 0.80Cr — 1.8Ni — 0.25Mo (0.38 — 0.43C) (SAE 4340)
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
• ISO Online browsing platform: available at https://www.iso.org/obp
• IEC Electropedia: available at https://www.electropedia.org/

Published by: Aerospace Industries Association (AIA), 1000 Wilson Boulevard, Suite 1700, Arlington,
VA 22209-3901, USA.
Published by: Society of Automotive Engineers (SAE), 400 Commonwealth Drive, Warrendale, PA 15096-0001,
USA.
4 Requirements
4.1 Configuration — Dimensions
See Figure 1, Table 1, Table 2 and Table 3.
Dimensions and tolerances are expressed in millimetres and apply after surface treatment.
Roughness shall be as follows:
• bearing surfaces (underhead face, fillet radius, shank, thread): Ramax = 0,8 µm;
• all other surfaces: Ramax = 3,2 µm;
• break sharp edges 0,1 to 0,4.

SIST EN 4
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