SIST EN 4850:2022

Aerospace series - Screw, 100° countersunk normal head, Spiral Drive Recess, coarse tolerance normal shank, medium length thread, in alloy steel, cadmium plated - Classification: 1 100 MPa (at ambient temperature)/235 °C

This document specifies the characteristics of externally threaded fasteners, 100° countersunk normal head, Spiral Drive Recess, coarse tolerance normal shank, medium length thread, in alloy steel, cadmium plated, for aerospace applications.
Classification: 1 100 MPa /235 °C .

Luft- und Raumfahrt - 100° Senkschraube mit Spiral Antrieb, grobe Schafttoleranz, mittlere Gewindelänge, aus legiertem Stahl, kadmiert - Klasse: 1 100 MPa (bei Raumtemperatur)/235 °C

Dieses Dokument legt die Eigenschaften von Verbindungselementen mit Außengewinde, 100°-Senkkopfschraube, Spiral-Antrieb, grobe Schafttoleranz, mittellanges Gewinde, aus legiertem Stahl, kadmiert, für Luft- und Raumfahrtanwendungen fest.

Série aérospatiale - Vis à tête fraisée normale 100°, empreinte en spirale, tige normale à tolérance large, filetage moyen, en acier allié, cadmiée - Classification : 1 100 MPa (à température ambiante)/235 °C

Le présent document spécifie les caractéristiques des éléments de fixation à filetage extérieur, à tête fraisée normale 100°, empreinte en spirale, tige normale à tolérance large, filetage moyen, en acier allié, cadmiés, pour les applications aérospatiales.
Classification : 1 100 MPa/235 °C.

Aeronavtika - Vijak, 100° ugrezna glava, spiralna vdolbina, široka toleranca, srednja navojna dolžina, iz legiranega jekla, kadmiran - Klasifikacija: 1100 MPa (pri temperaturi okolice)/235 °C

Ta dokument določa značilnosti zunanjih navojnih veznih elementov – 100° ugrezna glava, spiralna vdolbina, široka toleranca, srednja navojna dolžina, iz legiranega jekla, kadmiranih– za uporabo v aeronavtiki.
Klasifikacija: 1100 MPa/235 °C.

General Information

• Status: Published
• Publication Date: 05-Apr-2022
• ICS: 49.025.10 - Steels
• ICS: 49.030.20 - Bolts, screws, studs
• 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 4850:2022 - Aerospace series - Screw, 100° countersunk normal head, Spiral Drive Recess, coarse tolerance normal shank, medium length thread, in alloy steel, cadmium plated - Classification: 1 100 MPa (at ambient temperature)/235 °C

Overview

EN 4850:2022 is a CEN (ASD‑STAN) aerospace standard that defines the characteristics of a specific externally threaded fastener: a 100° countersunk head screw with Spiral Drive Recess, coarse‑tolerance normal shank, medium thread length, made of alloy steel and cadmium plated. The fastener is classified for a minimum tensile strength of 1 100 MPa at ambient temperature and is rated for service up to 235 °C. This standard is intended for use in aerospace manufacture, procurement and quality assurance where reproducible, high‑strength countersunk screws are required.

Key topics and technical requirements

• Configuration, dimensions and masses: Dimensional data (MJ thread sizes and length codes) and mass tables are provided; dimensions are expressed in millimetres and apply after surface treatment.
• Threading and drives: External threads follow ISO 3353‑1 (rolled external threads) and MJ limits per ISO 5855‑2. Spiral Drive Recess geometry and requirements are referenced to EN 4609.
• Material specification: Materials are specified by reference to EN 2137 or EN 3514 (alloy steels meeting the 1 100 MPa class).
• Surface treatment: Cadmium plating per EN 2133 with a recommended deposit of 8–14 µm on contactable surfaces; post‑treatment codes (A–D) define chromate or non‑chromium passivation options (ISO 4520 referenced).
• Form, position and roughness: Tolerances of form and position per ISO 7913. Surface roughness: Ramax = 0.8 µm for bearing surfaces and Ramax = 3.2 µm for other surfaces.
• Marking and designation: Indented marking rules and drive/hole codes referenced; marking standard EN 2424 applies.
• Quality and approval: Manufacturer approval, production controls and qualification follow EN 9100 / EN 9133 / ISO 8168 principles for aerospace fasteners.
• Intellectual property note: A patent claim (Spiral Drive System - e.g., EP1025370B1 / MORTORQ® trade name) is declared; license negotiation responsibility lies with the patent holder.

Applications and practical use

• Used where flush, high‑strength countersunk fastening is required in aircraft structures, interiors, assemblies and repair kits.
• Typical users: aerospace design engineers, fastener manufacturers, procurement/specification teams, quality managers, and MRO (maintenance, repair and overhaul) organizations.
• Helps ensure interchangeability, corrosion protection, mechanical performance and traceability for critical aerospace fasteners.

Related standards

• EN 2133 (cadmium plating), EN 2137 / EN 3514 (steel grades), EN 4609 (Spiral Drive), EN 2424 (marking)
• ISO 3353‑1, ISO 5855‑2, ISO 7913, ISO 8168, EN 9100, EN 9133, ISO 4520

Keywords: EN 4850:2022, aerospace screw standard, 100° countersunk, Spiral Drive Recess, cadmium plated fasteners, MJ thread, alloy steel fastener.

Standards Content (Sample)

SLOVENSKI STANDARD
01-maj-2022
Aeronavtika - Vijak, 100° ugrezna glava, spiralna vdolbina, široka toleranca,
srednja navojna dolžina, iz legiranega jekla, kadmiran - Klasifikacija: 1100 MPa (pri
temperaturi okolice)/235 °C
Aerospace series - Screw, 100° countersunk normal head, Spiral Drive Recess, coarse
tolerance normal shank, medium length thread, in alloy steel, cadmium plated -
Classification: 1 100 MPa (at ambient temperature)/235 °C
Luft- und Raumfahrt - 100° Senkschraube mit Spiral Antrieb, grobe Schafttoleranz,
mittlere Gewindelänge, aus legiertem Stahl, kadmiert - Klasse: 1 100 MPa (bei
Raumtemperatur)/235 °C
Série aérospatiale - Vis à tête fraisée normale 100°, empreinte en spirale, tige normale à
tolérance large, filetage moyen, en acier allié, cadmiée - Classification : 1 100 MPa (à
température ambiante)/235 °C
Ta slovenski standard je istoveten z: EN 4850:2022
ICS:
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 4850
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2022
EUROPÄISCHE NORM
ICS 49.030.20
English Version
Aerospace series - Screw, 100° countersunk normal head,
Spiral Drive Recess, coarse tolerance normal shank,
medium length thread, in alloy steel, cadmium plated -
Classification: 1 100 MPa (at ambient temperature)/235
°C
Série aérospatiale - Vis à tête fraisée normale 100°, Luft und Raumfahrt - 100° Senkschraube mit Spiral
empreinte en spirale, tige normale à tolérance large, Antrieb, grobe Schafttoleranz, mittlere Gewindelänge,
filetage moyen, en acier allié, cadmiée - Classification : aus legiertem Stahl, kadmiert - Klasse: 1 100 MPa (bei
1 100 MPa (à température ambiante)/235 °C Raumtemperatur)/235 °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 4850:2022 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 . 6
4.1 Configuration — Dimensions — Masses . 6
4.2 Tolerances of form and position . 10
4.3 Materials . 10
4.4 Surface treatment . 10
5 Designation . 11
6 Marking . 11
7 Technical specification . 12
Bibliography. 13

European foreword
This document (EN 4850:2022) 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, coarse tolerance normal shank, medium length thread, in alloy steel, cadmium
plated, for aerospace applications.
1 2
Classification: 1 100 MPa /235 °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 th
...