oSIST prEN 3155-066:2026

• Abstract:

  This document specifies the required characteristics, tests and tooling applicable to female electrical contacts, type A, crimp, class S, size 8, used in elements of connection in accordance with EN 3155-002.; It can be used together with EN 3155-001.; The associated male contacts are specified in EN 3155-065.

• Status: Not Published
• Public Enquiry End Date: 14-Sep-2026
• ICS: 49.060 - Aerospace electric equipment and systems
• Technical Committee: I13 - Imaginarni 13
• Current Stage: 4020 - Public enquire (PE) (Adopted Project)
• Start Date: 15-Jul-2026
• Due Date: 02-Dec-2026
• Completion Date: 15-Sep-2026
• Ref Project: prEN 3155-066 - Aerospace series - Electrical contacts used in elements of connection - Part 066: Contacts, electrical, female, type A, crimp, class S, size 8 - Product standard

• Referred By: SIST EN IEC 61400-8:2024 - Wind energy generation systems - Part 8: Design of wind turbine structural components (IEC 61400-8:2024)
• Effective Date: 09-Feb-2026
• Referred By: SIST EN ISO/ASTM 52909:2023 - Additive manufacturing of metals - Finished part properties - Orientation and location dependence of mechanical properties for metal powder bed fusion (ISO/ASTM 52909:2022)
• Effective Date: 28-Jan-2026
• Referred By: SIST EN ISO 52909:2024 - Additive manufacturing of metals - Finished part properties - Orientation and location dependence of mechanical properties for metal parts (ISO/ASTM 52909:2024)
• Effective Date: 28-Jan-2026
• Referred By: SIST EN 17533:2020 - Gaseous hydrogen - Cylinders and tubes for stationary storage
• Effective Date: 28-Jan-2026

oSIST prEN 3155-066:2026 is SIST’s Slovenian publication of the draft European Standard prEN 3155-066 for aerospace electrical contacts. It specifies the required characteristics, tests and tooling for female, type A, crimp, class S, size 8 contacts used in elements of connection, and it is meant to be read with EN 3155-002 and, where needed, EN 3155-001.

What does oSIST prEN 3155-066:2026 specify?

oSIST prEN 3155-066:2026 covers female electrical contacts, type A, crimp, class S, size 8, for use in elements of connection. The associated male contacts are in EN 3155-065, and the document can be used together with EN 3155-001 for shared technical specification, marking and gauge requirements.

The document is organized into:

• Scope
• Normative references
• Terms and definitions
• Required characteristics
• Designation
• Marking
• Technical specification
• Bibliography

What are the key requirements of oSIST prEN 3155-066:2026?

oSIST prEN 3155-066:2026 sets the contact’s key geometry, materials, tooling and verification methods. In practice, that means it tells manufacturers what to make, what tools to use, how to identify the part, and how to check it.

• Type and temperature range - Clause 4.1 states that type A contacts are for general application, and class S corresponds to an operating temperature range from -65 °C to 200 °C. This matters when selecting the contact for aircraft environments with wide thermal variation.

• Dimensions and mass - Clause 4.2 requires dimensions and mass to follow Figure 1 and Table 1, with dimensions and tolerances given in millimetres and applied after surface treatment. This is what inspectors use to confirm interchangeability and fit.

• Colour identification - Clause 4.3 links marking by colour code to Table 2 and ISO 8843. For users, this gives a quick visual way to distinguish contact and barrel combinations.

• Materials and finish - Clause 4.4 specifies a copper alloy body with gold on an appropriate undercoat. This matters for conductivity and surface durability.

• Permissible cables and crimp tooling - Clause 4.5 links the contact and barrel sizes to permissible conductor sizes and rated test current. Clause 4.6 then requires crimping tools to conform to MIL-DTL-22520, and insertion/extraction tools to conform to MIL-I-81969. This is the practical basis for choosing wire size and assembly tooling.

• Cable stripping - Clause 4.7 gives the stripped cable length range in Table 6. Assemblers use this to prepare the wire consistently before crimping.

• Verification tests - Clause 4.8 maps the required tests in Table 7 to EN 2591 methods. The table includes visual examination, dimensions and mass, electrical checks, endurance, temperature cycling, salt mist, shock, vibration, crimp strength, coating checks and magnetic permeability. Some tests carry specific conditions, such as endurance at 200 °C for 1 000 h, rapid temperature change between 200 °C and -65 °C, and magnetic permeability limited to 2.

• Designation, marking and technical specification - Clause 5 gives the designation format and delivery codes, including options for sealing sleeves. Clauses 6 and 7 defer marking and technical specification to EN 3155-001. This helps procurement and production use the same part description and markings.

What terms does oSIST prEN 3155-066:2026 define?

• Type A - The document says type A contacts are for general application.
• Class S - Class S corresponds to an operating temperature range from -65 °C to 200 °C.
• AWG - AWG means closest American Wire Gauge.
• Contact size - This is the size designation used in Table 1 and in the part designation.
• Barrel size - This is the barrel designation used alongside contact size in the part designation.
• Delivery code - The delivery code identifies whether the contact is supplied without a sealing sleeve or with a sealing sleeve in one of the EN 4530-004 variants.

Who uses oSIST prEN 3155-066:2026?

oSIST prEN 3155-066:2026 is used by aerospace connector manufacturers, cable harness assemblers, test laboratories, quality teams and buyers who need to specify or verify female crimp contacts. It is also relevant to design engineers selecting matching contacts, inspectors checking dimensions and marking, and production teams choosing the correct crimping, insertion and extraction tools.

Which standards are used with oSIST prEN 3155-066:2026?

Standard	What it contributes
EN 3155-001	Shared technical specification, gauges and marking rules
EN 3155-002	List and utilization of contacts in elements of connection
EN 3155-065	Matching male contacts
EN 2083	Copper or copper alloy conductors for electrical cables
ISO 8843	Identification system used for colour-code marking
MIL-DTL-22520	Crimping tool specification
MIL-I-81969	Insertion and extraction tool specification
EN 4530-004	Sealing sleeves used with delivery codes A, B and C
EN 2591 series	Test methods used in Table 7 for inspection, electrical, mechanical and environmental checks

What does the oSIST prEN 3155-066:2026 document contain?

The document contains Figure 1 and Tables 1 to 7, which cover dimensions and mass, colour code, permissible cables, tooling, stripping length and test requirements. It also includes a designation example showing how the part reference is built up from contact type, contact size, barrel size and delivery code.

Table 7 is the main compliance map: it points to the EN 2591 test methods and shows which ones apply to this contact type. Clauses 6 and 7 then connect marking and the technical specification back to EN 3155-001.

SLOVENSKI STANDARD
01-september-2026
Aeronavtika - Električni kontakti za uporabo v veznih elementih - 066. del:
Kontakti, električni, ženski, tip A, nagubani, razred S, velikost 8 - Standard za
proizvod
Aerospace series - Electrical contacts used in elements of connection - Part 066:
Contacts, electrical, female, type A, crimp, class S, size 8 - Product standard
Luft- und Raumfahrt - Elektrische Kontakte zur Verwendung in Verbindungselementen -
Teil 066: Elektrische Buchsenkontakte, Typ A, crimpbar, Klasse S, Größe 8 -
Produktnorm
Série aérospatiale - Contacts électriques utilisés dans les organes de connexion - Partie
066 : Contacts électriques, femelles, type A, à sertir, classe S, taille 8 - Norme de produit
Ta slovenski standard je istoveten z: prEN 3155-066
ICS:
49.060 Letalska in vesoljska Aerospace electric
električna oprema in sistemi equipment and systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
EUROPEAN STANDARD
NORME EUROPÉENNE
EUROPÄISCHE NORM
July 2026
ICS 49.060
English Version
Aerospace series - Electrical contacts used in elements of
connection - Part 066: Contacts, electrical, female, type A,
crimp, class S, size 8 - Product standard
Luft- und Raumfahrt - Elektrische Kontakte zur
Verwendung in Verbindungselementen - Teil 066:
Elektrische Buchsenkontakte, Typ A, crimpbar, Klasse
S, Größe 8 - Produktnorm
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee ASD-
STAN.
If this draft becomes a European Standard, 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.

This draft European Standard was established by CEN 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, Türkiye and
United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2026 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 3155-066:2026 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 Required characteristics . 6
4.1 Specific characteristics . 6
4.2 Dimensions and mass . 6
4.3 Marking by colour code . 7
4.4 Material, surface treatment . 8
4.5 Permissible cables . 8
4.6 Tooling . 8
4.6.1 Crimping tools . 8
4.6.2 Insertion/Extraction tools . 9
4.7 Cable stripping . 9
4.8 Tests . 9
4.9 Gauges . 11
5 Designation . 11
6 Marking . 11
7 Technical specification . 11
Bibliography . 12

European foreword
This document (prEN 3155-066:2026) has been prepared prepared by ASD-STAN.
After enquiries and votes carried out in accordance with the rules of this Association, this document has
received the approval of the National Associations and the Official Services of the member countries of
ASD-STAN, prior to its presentation to CEN.
This document is currently submitted to the CEN Enquiry.
Introduction
This document specifies the characteristics of female crimp contacts.
1 Scope
This document specifies the required characteristics, tests and tooling applicable to female electrical
contacts, type A, crimp, class S, size 8, used in elements of connection in accordance with EN 3155-002.
It can be used together with EN 3155-001.
The associated male contacts are specified in EN 3155-065.
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 2083, Aerospace series — Copper or copper alloy conductors for electrical cables — Product standard
EN 2591-101, Aerospace series — Elements of electrical and optical connection — Test methods —
Part 101: Visual examination
EN 2591-102, Aerospace series — Elements of electrical and optical connection — Test methods —
Part 102: Examination of dimensions and mass
EN 2591-202, Aerospace series — Elements of electrical and optical connection — Test methods —
Part 202: Contact resistance at rated current
EN 2591-204, Aerospace series — Elements of electrical and optical connection — Test methods —
Part 204: Discontinuity of contacts in the microsecond range
EN 2591-210, Aerospace series — Elements of electrical and optical connection — Test methods —
Part 210: Electrical overload
EN 2591-301, Aerospace series — Elements of electrical and optical connection — Test methods —
Part 301: Endurance at temperature
EN 2591-305, Aerospace series — Elements of electrical and optical connection — Test methods —
Part 305: Rapid change of temperature
EN 2591-307, Aerospace series — Elements of electrical and optical connection — Test methods —
Part 307: Salt mist
EN 2591-402, Aerospace series — Elements of electrical and optical connection — Test methods —
Part 402: Shock
EN 2591-403, Aerospace series — Elements of electrical and optical connection — Test methods —
Part 403: Sinusoidal and random vibration
EN 2591-406, Aerospace series — Elements of electrical and optical connection — Test methods —
Part 406: Mechanical endurance
EN 2591-415, Aerospace series — Elements of electrical and optical connections — Test methods —
Part 415: Test probe damage (female contacts)
EN 2591-417, Aerospace series — E
...