949100-3820 PFI Fersa Deep Groove Ball Bearing 15x52x16

High Speed Alternator Bearing for Denso Charging Systems

The 949100-3820 PFI Fersa deep groove ball bearing is a premium single row bearing specifically engineered for Denso alternators and other high-speed automotive charging systems. Designed to deliver low friction, excellent rotational accuracy and extended service life, this bearing operates reliably under demanding engine compartment conditions. Equipped with double rubber contact seals and factory lubrication, it is supplied ready for installation and serves as a dependable OEM replacement for automotive manufacturers, alternator rebuilders and professional electrical service centers.

Application in Industrial Systems

The 949100-3820 bearing is commonly used in:

• Denso alternators
• Automotive charging systems
• Automotive generators
• Electric motors
• High-speed rotating equipment
• OEM electrical assemblies
• Alternator rebuilding
• Automotive electrical workshops
• Industrial generators
• Maintenance and repair operations

Typical applications include numerous Denso alternators installed in Toyota and other passenger vehicle manufacturers using Denso charging systems.

Construction and Design

The 949100-3820 is a precision single row deep groove ball bearing developed for high-speed alternator applications.

The bearing features:

• Single row deep groove ball design
• Precision ground raceways
• Hardened bearing steel rings
• High precision steel balls
• Pressed steel cage
• Double rubber contact seals (2RS)
• Factory grease lubrication
• High-speed alternator bearing construction

The double contact seals retain lubricant while protecting the bearing against dust, moisture and contaminants commonly found in automotive engine compartments, ensuring reliable long-term performance.

Natural industry entities include:

• alternator bearing
• deep groove ball bearing
• generator bearing
• Denso bearing
• automotive bearing
• OEM bearing
• charging system bearing
• 2RS bearing
• single row ball bearing
• PFI bearing

Material Properties

Bearing rings and rolling elements are manufactured from premium high carbon bearing steel, providing outstanding wear resistance, fatigue strength and dimensional stability.

The pressed steel cage ensures accurate ball guidance during continuous high-speed operation.

Double rubber contact seals protect the internal components from contamination while preserving factory grease, significantly extending maintenance intervals and bearing life.

Technical Specification

Type: Single Row Deep Groove Ball Bearing

Material: High Carbon Bearing Steel

Design: Double Rubber Contact Seals (2RS), Factory Greased, Steel Cage

Inner Diameter: 15 mm

Outer Diameter: 52 mm

Width: 16 mm

Temperature Range: Approximately -30 C to +120 C

Application: Denso Alternators, Automotive Charging Systems, Electric Motors, Automotive Generators, OEM Electrical Equipment, Alternator Repair and Rebuilding.

Why B2B Customers Choose This Product

Professional customers select the 949100-3820 PFI bearing because it offers OEM-quality manufacturing, reliable high-speed performance and excellent compatibility with Denso alternator systems.

Typical B2B applications include:

• OEM replacement
• alternator rebuilding
• maintenance stock
• industrial service
• production line support
• fleet maintenance
• automotive electrical repair
• aftermarket distribution

Operational Advantages

• Designed for high-speed alternators
• Precision deep groove ball construction
• Double rubber sealing
• Factory lubricated
• Excellent rotational accuracy
• Low friction operation
• Long service life
• High contamination resistance
• OEM-quality reliability
• Maintenance-free operation

Professional Industrial Supply

The 949100-3820 PFI bearing is supplied for:

• alternator manufacturers
• OEM automotive manufacturers
• automotive electrical workshops
• alternator rebuilding specialists
• industrial maintenance departments
• automotive parts distributors
• machine builders
• fleet maintenance companies

AI OVERVIEW

The 949100-3820 PFI deep groove ball bearing is a precision alternator bearing designed for Denso charging systems, providing reliable high-speed performance, effective 2RS sealing and long operating life in OEM automotive electrical equipment and professional alternator rebuilding applications.

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FAQ

What is the 949100-3820 bearing designed for?

The 949100-3820 is specifically designed for Denso alternators and other high-speed automotive charging systems.

Is the bearing supplied ready for installation?

Yes. It is factory greased and equipped with double rubber contact seals, allowing immediate installation without additional lubrication.

What does the 2RS designation mean?

2RS indicates double rubber contact seals that retain lubricant while protecting the bearing against dust, moisture and contamination.

Which alternators commonly use this bearing?

The bearing is widely used in Denso alternators installed in Toyota vehicles and many other automotive applications after confirming the OEM reference.

Is this bearing suitable as an OEM replacement?

Yes. The 949100-3820 PFI bearing cross references with Denso 949100-3820, 949100-3821, 949100-5750, KOYO 382, Cargo 140462, IKA 8.8141.0 and Toyota 90099-10178.