Gates RNA 49 Series Machined Needle Roller Bearing | High Radial Load Capacity (No Inner Ring)

The GATES RNA 49 Series represents a premium class of machined needle roller bearings, specifically designed for applications requiring extremely high radial load carrying capacity within a compact envelope. This design utilizes high-precision, deep-drawn outer rings and robust cage and roller assemblies, resulting in exceptional operational rigidity and minimized deflection under heavy continuous loads. The key characteristic of the RNA series is the omission of an inner ring, allowing the shaft itself to serve as the inner raceway, provided the shaft surface is appropriately hardened and ground to meet stringent tolerance requirements (typically HRC 58-64 and fine finish). This configuration maximizes the effective roller length and ensures optimized load distribution, making the RNA 49 series the preferred choice when space constraints are severe but performance cannot be compromised. Optimized for heavy-duty industrial machinery, the RNA 49 series excels in critical applications such as gearboxes, machine tool spindles, automotive transmissions, and large hydraulic pump assemblies. By integrating the shaft as the inner raceway, designers can achieve greater rotational accuracy and stiffness compared to standard ball bearings in the same footprint. GATES manufacturing standards ensure highly precise roller geometry and minimal friction, contributing to reduced operating temperatures and extended service life. Each bearing is manufactured from high-grade bearing steel, offering reliable performance under high speeds and demanding operational cycles, reinforcing equipment longevity and reducing maintenance overhead.

Key Features

• Extremely High Radial Load Capacity due to optimized roller-to-raceway contact.
• Space-Saving Design: No inner ring allows for maximum capacity within a minimal cross-section.
• High Rigidity and Low Deflection suitable for precision indexing and machine tool applications.
• Robust Caged Roller Assembly ensures precise roller guidance and high limiting speeds.
• Machined Outer Ring provides superior strength and tolerance accuracy compared to drawn cup alternatives.
• Ideal for applications where the shaft can be induction hardened and precision ground (HRC 58-64).

Technical Specifications