SIST EN 2596:2009

• Abstract:

  This standard specifies the characteristics of lock washers in corrosion resisting steel, cadmium plated, with radial serrations primarily intended for flight control rods.; These lock washers are intended to immobilise the rod end in relation to the rod body, whilst allowing a precise positional adjustment.

• Status: Published
• Publication Date: 24-Mar-2009
• ICS: 49.030.50 - Washers and other locking elements
• Technical Committee: I13 - Imaginarni 13
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 19-Jan-2009
• Due Date: 26-Mar-2009
• Completion Date: 25-Mar-2009
• Ref Project: EN 2596:2006 - Aerospace series - Washers, lock, with radial serrations in corrosion resisting steel, cadmium plated for flight control rods - Dimensions

• Replaces: SIST EN 2596:2001 - Aerospace series - Washers, lock, with radial serrations, in corrosion resisting steel, cadmium plated - Dimensions
• Effective Date: 01-May-2009
• Replaces: SIST EN 2596:2001/AC1:2001 - Aerospace series - Washers, lock, with radial serrations, in corrosion resisting steel, cadmium plated - Dimensions
• Effective Date: 01-May-2009
• Refers: SIST EN 9100:2018 - Quality Management Systems - Requirements for Aviation, Space and Defense Organizations
• Effective Date: 28-Jan-2026
• Refers: SIST EN 2133:2021 - Aerospace series - Cadmium plating of steels with specified tensile strength ≤ 1 450 MPa, copper, copper alloys and nickel alloys
• Effective Date: 28-Jan-2026

SIST EN 2596:2009 is the Slovenian adoption of EN 2596:2006 from SIST. It specifies the dimensions and key characteristics of cadmium-plated lock washers in corrosion-resisting steel with radial serrations for flight control rods, so the washer can immobilise the rod end relative to the rod body while still allowing precise positional adjustment.

What does SIST EN 2596:2009 specify?

SIST EN 2596:2009 covers lock washers with radial serrations for flight control rods. The standard defines the washer form, material, surface treatment, marking and designation needed to identify the correct part for aerospace use.

The document is organised into six clauses: Scope, Normative references, Required characteristics, Designation, Marking and Qualification. Its technical detail is concentrated in Clause 3 and the supporting figures and tables, which give the geometry, codes and mass data used to specify the washer correctly.

What are the key requirements of SIST EN 2596:2009?

• Clause 3.1 ties the part shape to Figures 1 to 3 and the sizes to Tables 1 and 2. The dimensions apply after cadmium plating, so inspection and acceptance must be based on the finished plated part, not the unplated blank.

• Clause 3.2 sets the surface roughness before cadmium plating. This matters because the manufacturer has to control the pre-plating finish to get the intended performance and coating quality.

• Clause 3.3 specifies the material as steel according to EN 2540 or EN 2538. EN 2538 is marked inactive for new design, so current design work should use the material route intended by the standard for new applications.

• Clause 3.4 requires cadmium plating according to EN 2133, with a thickness of 10 µm to 20 µm and without chromatation. In practice, this defines the corrosion-protection finish and the coating process the supplier has to control.

• Clause 4 gives the designation system. The designation uses a description block and an identity block, with the diameter code from Table 1 and the washer code from Table 3. This matters for ordering, drawing notes and part traceability.

• Clause 5 sets the marking rules. Each washer and its packaging are marked with the identity block, and the marking method and position are left to the manufacturer. The marking should be indelible where possible and must not affect the washer properties.

• Clause 6 links qualification to EN 9100. For users, this means supply and acceptance sit within an aerospace quality management system rather than only a dimensional check.

What terms does SIST EN 2596:2009 define?

• Lock washer assembly - The complete washer assembly identified by code C in Table 3.

• Element, rod body side - The part shown in Figure 1 and identified by code A; it is the side that interfaces with the rod body.

• Element, rod end side - The part shown in Figure 2 and identified by code B; it is the side that interfaces with the rod end.

• Description block - The first part of the designation, which states the washer type and the relevant codes.

• Identity block - The second part of the designation, which carries the standard number and the code needed to identify the exact washer.

• Diameter code - The size code from Table 1, such as 08, 10, 12, 14 or 16, used to select the correct washer dimensions.

Who uses SIST EN 2596:2009?

SIST EN 2596:2009 is used by aerospace designers, fastener and washer manufacturers, quality engineers, and procurement staff working on flight control rod assemblies. It helps them specify the correct washer geometry, choose the right material and coating, and check that the part is marked and designated in a consistent way.

It is also useful for inspectors and suppliers who need a common definition of the part before production, receiving inspection or configuration control.

What changed in SIST EN 2596:2009 from the previous edition?

SIST EN 2596:2009 replaces SIST EN 2596:2001 and SIST EN 2596:2001/AC1:2001. The European foreword also states that EN 2596:2006 supersedes EN 2596:1988.

Which standards are used with SIST EN 2596:2009?

• EN 2133 - Defines the cadmium plating requirement used for the washer surface treatment.

• EN 2538 - Gives one of the permitted steel material specifications named in Clause 3.3.

• EN 2540 - Gives the other permitted steel material specification named in Clause 3.3.

• EN 9100 - Provides the quality management system basis used for qualification.

What does the SIST EN 2596:2009 document contain?

The document contains configuration figures for the rod body side, rod end side and lock washer assembly, plus dimensional tables that define the sizes, serration counts and masses. It also includes the designation example and the code table used to build the part identity.

In practical use, this makes the standard a specification for geometry, material, coating, identification and qualification rather than a test-method document. The tables and figures are the parts that a designer, buyer or inspector would use when matching a washer to a flight control rod application.

SLOVENSKI STANDARD
01-maj-2009
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SIST EN 2596:2001
SIST EN 2596:2001/AC1:2001
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Aerospace series - Washers, lock, with radial serrations in corrosion resisting steel,
cadmium plated for flight control rods - Dimensions
Luft- und Raumfahrt - Sicherungen, radialverzahnt aus korrosionsbeständigem Stahl,
verkadmet für Bediengestänge von Flugsteuerungen - Maße
Série aérospatiale - Freins à stries radiales en acier résistant à la corrosion, cadmiés
pour bielles de commandes de vol - Dimensions
Ta slovenski standard je istoveten z: EN 2596:2006
ICS:
49.030.50 Podložke in drugi blokirni Washers and other locking
elementi elements
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 2596
NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2006
ICS 49.060 Supersedes EN 2596:1988
English Version
Aerospace series - Washers, lock, with radial serrations in
corrosion resisting steel, cadmium plated for flight control rods -
Dimensions
Série aérospatiale - Freins à stries radiales en acier Luft- und Raumfahrt - Sicherungen, radialverzahnt aus
résistant à la corrosion, cadmiés pour bielles de korrosionsbeständigem Stahl, verkadmet für
commandes de vol - Dimensions Bediengestänge von Flugsteuerungen - Maße
This European Standard was approved by CEN on 6 January 2006.
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
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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
© 2006 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 2596:2006: E
worldwide for CEN national Members.

Contents Page
Foreword .3
1 Scope.4
2 Normative references.4
3 Required characteristics.4
4 Designation.6
5 Marking.7
6 Qualification.7

Foreword
This European Standard (EN 2596:2006) 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 November 2006, and conflicting national standards shall be withdrawn
at the latest by November 2006.
Attention is drawn to the possibility that some of the elemen
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