SIST EN 3284:2001

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

This standard specifies the characteristics of rigid single row ball bearings in steel of 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 - Durchmesserreihen 0 und 2 - Normale Lagerluft - Maße und Belastungen

Diese Norm legt die Eingenschaften von einreihigen Rillenkugellagern aus Stahl 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 Steuerungseinrichtungen 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, rigides, a une rangée de billes - Séries de diametres 0 et 2 - Catégorie a jeux normaux - Dimensions et charges

La présente norme spécifie les caractéristiques des roulements en acier, 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 roulement de structure défins 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 - Diameter series 0 and 2 - Normal clearance category - Dimensions and loads

General Information

• Status: Published
• Publication Date: 31-Dec-2000
• ICS: 49.035 - Components for aerospace construction
• Technical Committee: SS SPL - Technical Board for the general field
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Jan-2001
• Due Date: 01-Jan-2001
• Completion Date: 01-Jan-2001
• Ref Project: EN 3284:1994 - Aerospace series - Bearings, airframe rolling - Rigid single row ball bearings in steel - Diameter series 0 and 2 - Normal clearance category - Dimensions and loads

Relations

• Referred By: SIST EN 3280:2011 - Aerospace series - Bearings, airframe rolling, rigid or self-aligning - Technical specification
• Effective Date: 28-Jan-2026

Overview

SIST EN 3284:2001 is a critical European standard published by CEN defining the characteristics of rigid single row ball bearings in steel, specifically in diameter series 0 and 2. These airframe rolling bearings are engineered for use in aerospace applications and are designed to withstand slow rotations and oscillations under load. The specification details dimensions, load capacities, and the normal clearance category, ensuring parts meet strict performance and safety requirements for airframe use. This standard applies to steel ball bearings intended for operating temperatures between -54°C and +150°C.

Key Topics

• Rigid Single Row Ball Bearings: Specification focuses on non-flexible, single row configurations for structural integrity in aerospace designs.
• Diameter Series 0 and 2: Only bearings within specified diameter ranges are included, standardizing sizing for interchangeability across applications.
• Normal Clearance Category: Establishes expected internal bearing clearances, crucial for optimal performance under varying thermal and mechanical loads.
• Steel Construction: Ensures high strength, durability, and reliability required for components subject to the rigorous demands of aerospace environments.
• Specified Dimensions and Loads: Details on size and permissible loads are provided to assist designers and engineers with component selection and integration.

Applications

SIST EN 3284:2001 bearings are specifically intended for aerospace structures, providing reliable motion between fixed and articulated elements within the aircraft. Typical uses include:

• Fixed and Moving Aircraft Parts: Bearings enable controlled movement in stabilizers, flaps, hinges, and landing gear assemblies, where robustness and precision are essential.
• Control Mechanisms: Serve as critical components in control linkages resisting both vibration and load, yet accommodating only slow rotations or oscillatory movement to maintain flight safety.
• Aerospace Equipment: Suitable for both civil and military aircraft, these standardized bearings support various subsystems exposed to harsh environmental conditions and temperature extremes.
• Replacement and Maintenance: Standardized dimensions simplify sourcing and replacement, aiding maintenance operations and ensuring continued airworthiness.

By adhering to SIST EN 3284:2001, manufacturers and maintenance engineers can ensure compatibility, quality, and compliance in the aerospace sector, fulfilling industry expectations for safety and longevity.

Related Standards

For comprehensive design and application, SIST EN 3284:2001 should be considered alongside other relevant standards in the aerospace domain, such as:

• EN 2377 - Aerospace series covering related bearing types and measurement methods
• EN 3660 - Connectors and associated hardware used in aerospace electrical systems
• EN 3290 - Guidance on slewing bearings and dynamic loads in aircraft systems
• AS9100 - Quality management systems standard for the aerospace industry

These standards complement EN 3284 by establishing broader requirements for aerospace components, contributing to safer and more reliable aircraft systems.

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Keywords: SIST EN 3284:2001, aerospace bearings, airframe rolling bearings, rigid single row ball bearings, steel bearings, diameter series 0 and 2, normal clearance, dimensions and loads, CEN, aircraft structure, aerospace components, high temperature bearings, aviation standards.

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 - Diameter series 0 and 2 - Normal clearance category - Dimensions and loadsLuft- und Raumfahrt - Flugwerklager - Einreihige Rillenkugellager aus Stahl - Durchmesserreihen 0 und 2 - Normale Lagerluft - Maße und BelastungenSérie aérospatiale - Roulements pour structures d'aéronefs - Roulements en acier, rigides, a une rangée de billes - Séries de diametres 0 et 2 - Cat
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