kSIST FprEN 6046:2025

• Abstract:

  This document specifies the characteristics of inch based spherical plain bearing, metal to metal, in corrosion resisting steel, narrow series.; They are intended for use in fixed or moving parts of the aircraft structure and their control mechanisms.; They are used in the temperature range as determined by the grease capability as below:; - code A: greased as per MIL-PRF-23827 Type I, operating temperature range −73 °C to 121 °C;; - code B: greased as per MIL-PRF-81322, operating temperature range −54 °C to 177 °C.; The range of application for bearings lubricated with grease per code A is limited to 121 °C.; In both cases the spherical surface of the outer or inner ring are provided with a dry-film lubricant as per MIL-PRF-46010 or equivalent (anti-seizing protection).; The slide hole treatment either at the outer ring or inner ring.

• Status: Not Published
• Public Enquiry End Date: 30-Jul-2024
• ICS: 21.100.01 - Bearings in general
• ICS: 49.035 - Components for aerospace construction
• Technical Committee: I13 - Imaginarni 13
• Current Stage: 5020 - Formal vote (FV) (Adopted Project)
• Start Date: 27-Oct-2025
• Due Date: 15-Dec-2025
• Completion Date: 28-Oct-2025
• Ref Project: EN 6046:2026 - Aerospace series - Bearing, spherical, plain, in corrosion resisting steel - Narrow series - Dimensions and loads - Inch series

• Revises: SIST EN 6046:2020 - Aerospace series - Bearing, spherical, plain, in corrosion resisting steel - Narrow series - Dimensions and loads - Inch series
• Effective Date: 30-Aug-2023

kSIST FprEN 6046:2025 is a CEN aerospace standard for inch-based spherical plain bearings in corrosion resisting steel, narrow series. It specifies the dimensions, loads, clearances, materials, surface treatment, marking and quality rules for bearings used in aircraft structure and control mechanisms, including grease code A and code B service conditions.

What does kSIST FprEN 6046:2025 specify?

kSIST FprEN 6046:2025 covers metal-to-metal spherical plain bearings in corrosion resisting steel for fixed or moving aircraft structural parts and control mechanisms. The document is organized into clauses 1 to 8, with Figures 1 to 5 and Tables 1 to 3 providing the design and performance data.

The scope also defines the lubrication conditions, dry-film protection and slide-hole treatment used with these bearings. In practice, that means the buyer or designer has to choose the bearing code set that matches the temperature, lubrication and installation method.

What are the key requirements of kSIST FprEN 6046:2025?

kSIST FprEN 6046:2025 ties the product to a small set of design, material and performance rules that matter directly in selection and acceptance.

• Clause 1 defines code A and code B grease conditions, each linked to a MIL-PRF grease and a service temperature range. Code A is limited to 121 °C, so it suits lower-temperature applications only.
• Clause 4.1 says configuration, dimensions, tolerances and mass follow Figures 1-2 and Table 1, and the values apply after surface treatment. That means final inspection should be done on the finished part, not on an untreated blank.
• Clause 4.2 gives the surface roughness requirements from Figures 1-2, with values applying before surface treatment. This separates machining checks from coating checks.
• Clause 4.3 assigns the ring materials: the inner ring uses EN 2030 material, and the outer ring uses EN 3161 material, each with a specified hardness band. This is the basis for material certification and hardness control.
• Clause 4.4 defines surface-treatment options, including the basic condition and code Z, which adds cadmium plating on the outer ring followed by chromating. The same clause also distinguishes code S and code R for bearings without or with swaging grooves.
• Clause 4.5 links loads and clearances to Tables 2 and 3. The load table separates permissible and ultimate static loads, and notes that installed push-out loads may be lower than the table values.
• Clause 5 builds the designation from the standard number, grease code, clearance code, diameter code, grease-hole code, swaging-groove code and surface-treatment code. That gives a single ordering and specification string.
• Clause 6 requires marking in accordance with EN 2424, style A, and allows the manufacturer part number. Clause 8 requires an approved aerospace production organization, a quality management system and a documented qualification procedure.

What terms does kSIST FprEN 6046:2025 define?

kSIST FprEN 6046:2025 uses a few key symbols and codes that are important for design and checking.

• spherical plain bearing - a metal-to-metal bearing with spherical contact surfaces that allows angular movement.
• code A - the grease condition based on MIL-PRF-23827 Type I for the lower operating temperature range.
• code B - the grease condition based on MIL-PRF-81322 for the wider, higher-temperature range.
• code E / F / G - the grease-hole configurations: no grease holes, grease holes on the inner ring, or grease holes on the outer ring.
• α - the maximum angle of tilt between the outer ring and inner ring while the spherical surfaces remain fully in contact.
• Clearance - the radial or axial play defined and tested according to EN 2337.
• dmp, Dmp, ds, Ds - the symbols for mean diameter deviations and single diameter deviations used for tolerance control.

Who uses kSIST FprEN 6046:2025?

kSIST FprEN 6046:2025 is used by aerospace bearing manufacturers, airframe designers, control-system engineers, buyers and quality teams. They use it to select a bearing size and code combination, specify materials and surface treatment, check loads and clearances, and verify marking and qualification before release or acceptance.

What changed in kSIST FprEN 6046:2025 from the previous edition?

kSIST FprEN 6046:2025 supersedes EN 6046:2020. The listed technical changes are updated normative references and a correction to the alpha value for diameter codes 14 and 16 in Table 1.

Which standards are used with kSIST FprEN 6046:2025?

kSIST FprEN 6046:2025 relies on several companion standards and referenced documents:

• EN 2030 - material specification for the inner ring.
• EN 3161 - material specification for the outer ring.
• EN 2133 - cadmium plating used for code Z.
• EN 2337 - technical specification, including load and clearance definitions and testing.
• EN 2424 - marking of aerospace products.
• ISO 8075 - surface treatment of hardenable stainless steel parts.
• ISO 1132-1 - tolerance terms and symbols.
• TR 4475 - vocabulary plus definitions for loads and clearance.
• EN 9100 and EN 9133 - quality management and qualification procedure references used in Clause 8.
• MIL-PRF-23827, MIL-PRF-81322 and MIL-PRF-46010 - grease and dry-film lubricant conditions named in the scope.

What does the kSIST FprEN 6046:2025 document contain?

Figures 1 and 2 show the bearing forms, including the S and R swaging-groove versions and the treated surfaces. Figures 3 to 5 show the grease-hole arrangements for codes E, F and G. Tables 1 to 3 provide the dimensions, tolerances, mass, loads and clearances used for design and acceptance. Clause 5 gives the designation structure, Clause 6 covers marking, and Clause 8 sets the production and qualification expectations.

SLOVENSKI STANDARD
oSIST prEN 6046:2024
01-julij-2024
Aeronavtika - Kroglični drsni ležaji iz korozijsko odpornega jekla - Ozki tip - Mere
in obremenitve - Palčne mere
Aerospace series - Bearing, spherical, plain, in corrosion resisting steel - Narrow series -
Dimensions and loads - Inch series
Luft- und Raumfahrt - Gelenklager aus korrosionsbeständigem Stahl - Schmale Reihe -
Maße und Belastungen - Inch-Reihe
Série aérospatiale - Rotule lisse en acier résistant à la corrosion - Série étroite -
Dimensions et charges - Série en inches
Ta slovenski standard je istoveten z: prEN 6046
ICS:
21.100.01 Ležaji na splošno Bearings in general
49.035 Sestavni deli za letalsko in Components for aerospace
vesoljsko gradnjo construction
oSIST prEN 6046:2024 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

oSIST prEN 6046:2024
oSIST prEN 6046:2024
DRAFT
EUROPEAN STANDARD
prEN 6046
NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2024
ICS 49.035 Will supersede EN 6046:2020
English Version
Aerospace series - Bearing, spherical, plain, in corrosion
resisting steel - Narrow series - Dimensions and loads -
Inch series
Série aérospatiale - Rotule lisse en acier résistant à la Luft- und Raumfahrt - Gelenklager aus
corrosion - Série étroite - Dimensions et charges - Série korrosionsbeständigem Stahl - Schmale Reihe - Maße
en inches und Belastungen - Inch-Reihe
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
© 2024 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 6046:2024 E
worldwide for CEN national Members.

oSIST prEN 6046:2024
prEN 6046:2024 (E)
Contents Page
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms, definitions and symbols . 5
4 Requirements . 6
4.1 Configuration, dimensions, tolerances and mass . 6
4.2 Surface roughness . 6
4.3 Material . 6
4.4 Surface treatment . 6
4.5 Loads and clearances . 6
5 Designation . 14
6 Marking . 15
7 Technical specification . 15
8 Quality management systems. 15
Bibliography. 16

oSIST prEN 6046:2024
prEN 6046:2024 (E)
European foreword
This document (prEN 6046:2024) 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 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.
This document will supersede EN 6046:2020.
prEN 6046:2024 includes the following significant technical changes with respect to EN 6046:2020:
— normative references updated;
— value of alpha for diameter codes 14 and 16 in Table 1 corrected.
oSIST prEN 6046:2024
prEN 6046:2024 (E)
Introduction
This document is published at edition P7. Former editions P1 to P6 and drafts may exist for Airbus
development only but without any ASD-STAN official publication. In consequence configuration
management discrepancies with these unofficial documents are under Airbus responsibility.
oSIST prEN 6046:2024
prEN 6046:2024 (E)
1 Scope
This document specifies the characteristics of inch based spherical plain bearing, metal to metal, in
corrosion resisting steel, narrow series.
They are intended for use in fixed or moving parts of the aircraft structure and their control
mechanisms.
They are used in the temperature range as determined by the grease capability as below:
— code A: greased as per MIL-PRF-23827 Type I, operating temperature range −73 °C to 121 °C;
— code B: greased as per MIL-PRF-81322, operating temperature range −54 °C to 177 °C.
The range of application for bearings lubricated with grease per code A is limited to 121 °C.
In both cases the spherical surface of the outer or inner ring are provided with a dry-film lubricant as
per MIL-PRF-46010 or equivalent (anti-seizing protection).
The slide hole treatment either at the outer ring or inner ring.
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 2030, Aerospace series — Steel X105CrMo17 (1.3544) — Hardened and tempered — Bars —
D ≤ 150 mm
e
EN 2133, Aerospace series — Cadmium plating of steels with specified tensile strength ≤ 1 450 MPa,
copper, copper alloys and nickel alloys
EN 2337, Aerospace series — Spherical plain bearings — Technical specification
EN 2424, Aerospace series — Marking of aerospace products
EN 3161, Aerospace series — Steel FE-PM3801 (X5CrNiCu17-4) — Air melted, solution treated and
precipitation treated, bar a or D ≤ 200 mm, R ≥ 930 MPa
m
ISO 1132-1, Rolling bearings — Tolerances — Part 1: Terms and definitions
ISO 8075, Aerospace — Surface treatment of hardenable stainless steel parts
TR 4475, Aerospace series — Bearings and mechanical transmissions for airframe applications —
Vocabulary
3 Terms, definitions and symbols
For the purposes of this document, the terms and definitions given in TR 4475 apply.
ISO and IEC maintain terminology 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/
oSIST prEN 6046:2024
prEN 6046:2024 (E)
Symbols of limit deviations are in accordance with definitions of ISO 1132-1.
𝛼𝛼 maximum angle of tilt of the outer ring with respect to the inner ring, with the spherical
surface of the outer ring being completely in contact with the inner ring
C permissible static axial load
a
C permissible static radial load
s
∆ single plane mean bore diameter deviation
dmp
∆ single plane mean outside diameter deviation
Dmp
∆ deviation of a single bore diameter
ds
∆Ds deviation of a single outside diam
...