EN 3285:1994

Aerospace series - Bearings, airframe rolling - Rigid single row ball bearings in steel, cadmium plated - Diameter series 0 and 2 - Normal clearance category - Dimensions and loads

This standard specifies the characteristics of rigid single row ball bearings i in steel, cadmium plated, or diameter series 0 and 2 designed to withstand only slow rotations and oscillations under load. They are intended for use between fixed and moving parts of the aircraft structure and their control mechanisms. The airframe rolling bearings defined in this standard are used from -54°C to +150°C.

Luft- und Raumfahrt - Flugwerklager - Einreihige Rillenkugellager aus Stahl, verkadmet - Durchmesserreihen 0 und 2 - Normale Lagerluft - Maße und Belastungen

Diese Norm legt die Eigenschaften von einreihigen Rillenkugellagern aus Stahl, verkadmet, der Durchmesserreihen 0 und 2 fest, die so ausgelegt sind, dass sie unter Belastung nur langsamen Dreh- und Schwenkbewegungen standhalten. Sie sind zur Verwendung zwischen starren und beweglichen Flugwerkteilen und deren Steuerungseinrichtugen vorgesehen. Die in der vorliegenden Norm festgelegten Flugwerklager sind in dem Temperatur- bereich von -54°C bis +150°C anwendbar.

Série aérospatiale - Roulements pour structures d'aéronefs - Roulements en acier, cadmiés, rigides, à une rangée de billes - Série de diamètres 0 et 2 - Catégorie à jeux normaux - Dimensions et charges

La présente norme spécifie les caractéristiques des roulements en acier, cadmiés, rigides, à une rangée de billes, séries de diamètres 0 et 2 conçus pour supporter en charge uniquement des rotations lentes et des oscillations faibles. Ils sont destinés à être utilisés entre les éléments fixes et mobiles de la structure des aéronefs et de leurs mécanismes de commande. Les roulements de structure définis par la présente norme sont utilisables dans l'intervalle de température de -54°C à +150°C.

Aerospace series - Bearings, airframe rolling - Rigid single row ball bearings in steel, cadmium plated - Diameter series 0 and 2 - Normal clearance category - Dimensions and loads

General Information

• Status: Published
• Publication Date: 22-May-1994
• Withdrawal Date: 29-Nov-1994
• ICS: 49.035 - Components for aerospace construction
• Technical Committee: ASD-STAN - Aerospace
• Drafting Committee: ASD-STAN/D 3 - Mechanical
• Current Stage: 9093 - Decision to confirm - Review Enquiry
• Start Date: 21-Jan-2025
• Completion Date: 14-May-2025
• Ref Project: SIST EN 3285:2001 - Aerospace series - Bearings, airframe rolling - Rigid single row ball bearings in steel, cadmium plated - Diameter series 0 and 2 - Normal clearance category - Dimensions and loads

Overview

EN 3285:1994 is a European aerospace standard that defines the specifications for rigid single row ball bearings used in airframe rolling applications. These bearings are manufactured from steel and cadmium plated to ensure durability and corrosion resistance. The standard covers bearings in diameter series 0 and 2 with a normal clearance category, detailing both dimensions and load capacities. Designed for use in aircraft structures and control mechanisms, these bearings are optimized for slow rotations and oscillations under load, operating effectively across a temperature range from -54°C to +150°C.

Key Topics

• Bearing Type and Material: Rigid single row ball bearings made from steel and finished with a cadmium plating to enhance corrosion resistance in aerospace environments.
• Diameter Series: Specifies diameter series 0 and 2, focusing on smaller-sized bearings typical for critical aerospace applications.
• Clearance Category: Normal clearance is defined to ensure optimal performance under operating conditions involving slow rotation and oscillation.
• Dimensions and Loads: Precise dimensional parameters and load ratings are established, supporting consistent quality and interchangeability.
• Operating Conditions: Bearings are suitable for use between fixed and moving parts in aircraft, capable of functioning within a wide temperature range (-54°C to +150°C) relevant for aerospace environments.
• Application Scope: Intended specifically for airframe rolling elements subjected to slow motion and oscillatory loads rather than continuous high-speed rotation.

Applications

EN 3285:1994 bearings are integral components for aerospace engineering, particularly in:

• Aircraft Structural Assemblies: Facilitating relative movement between fixed and moving airframe parts such as wing flaps, landing gear, and control surfaces.
• Control Mechanisms: Supporting components where precise and reliable oscillatory motion is essential for flight control systems.
• Environmental Resilience: Their cadmium-plated surface and operating temperature range make these bearings suitable for harsh aerospace conditions including extreme cold and moderate heat environments.
• Maintenance and Interchangeability: Standardized dimensions and load ratings ensure easy replacement and maintenance within aircraft systems, improving operational reliability and lifespan.

Related Standards

• EN 1337 Series – Structural steel bearing standards which may complement aerospace bearing requirements for supporting frameworks.
• ISO 15243 – Rolling bearings failure modes and effects, providing quality assurance guidelines relevant for aerospace bearings.
• EN 3651 – Aerospace series bearings general conditions and requirements that frame broader parameters for aerospace component standardization.
• MIL-STD-810 – Environmental engineering considerations and laboratory tests which define environmental test methods that aerospace bearings must withstand.

By adhering to EN 3285:1994, aerospace manufacturers and maintenance teams can ensure that the rolling bearings used within their aircraft are optimized for reliability, dimensional accuracy, and suitable for harsh operational conditions, improving overall safety and performance in aviation systems.

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Aerospace series - Bearings, airframe rolling - Rigid single row ball bearings in steel, cadmium plated - Diameter series 0 and 2 - Normal clearance category - Dimensions and loadsLuft- und Raumfahrt - Flugwerklager - Einreihige Rillenkugellager aus Stahl, verkadmet - Durchmesserreihen 0 und 2 - Normale Lagerluft - Maße und BelastungenSérie aérospatiale - Roulements pour structures d'aéronefs - Roulements en acier, cadmiés, rigides, a une rangée de billes - Série de diametres 0
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