INA NA4905 Needle Roller Bearings 25×42×17 mm
The INA NA4905 is a high-performance single-row needle roller bearing with an inner ring, part of the Schaeffler Group's premium INA bearing portfolio renowned for exceptional precision and durability in industrial applications. As a member of the 49 dimension series, this bearing combines a compact design with impressive load-carrying capabilities, making it ideal for space-constrained machinery requiring reliable radial load support.
The INA NA4905 is a high-performance single-row needle roller bearing with an inner ring, part of the Schaeffler Group's premium INA bearing portfolio renowned for exceptional precision and durability in industrial applications. As a member of the 49 dimension series, this bearing combines a compact design with impressive load-carrying capabilities, making it ideal for space-constrained machinery requiring reliable radial load support.
Key Specifications
| Parameter | Value | Description |
|---|---|---|
| Model Designation | NA4905 | Single-row needle roller bearing with inner ring |
| Dimensions (d × D × B) | 25 × 42 × 17 mm | Inner diameter: 25 mm, Outer diameter: 42 mm, Width: 17 mm |
| Bearing Type | Machined needle roller bearing | Precision-manufactured components for optimal performance |
| Dynamic Load Rating (Cr) | 27.5 kN | Maximum radial load capacity under dynamic conditions |
| Static Load Rating (C0r) | 32.5 kN | Maximum radial load capacity under static conditions |
| Limiting Speed (Grease Lubrication) | 14,400 RPM | Recommended maximum operating speed with proper lubrication |
| Sealing Options | Open (standard), 2RSR (double lip seals), XL (extended performance) | Customizable for specific application requirements |
| Weight | 0.063 kg | Lightweight design for reduced rotational inertia |
Technical Features & Advantages
- High Radial Load Capacity: The large number of needle rollers (small diameter relative to length) enables this bearing to handle significantly higher radial loads than comparably sized ball bearings.
- Compact Cross-Section: The 49 series design offers an optimal balance between size and performance, perfect for applications with limited installation space.
- Integral Inner Ring: Provides a hardened, precision-ground raceway that ensures consistent roller guidance and extends bearing service life.
- Separable Design: Facilitates easy mounting and dismounting, simplifying maintenance procedures and reducing downtime.
- Annular Lubrication Groove: Standard feature on the outer ring with lubrication holes for efficient relubrication and prolonged operational lifespan.
- X-life Quality: Manufactured to INA's premium X-life standards, delivering up to 50% longer service life compared to conventional bearings under the same operating conditions.
Applications
The INA NA4905 is widely used in various industrial sectors, particularly in:
- Printing machinery (Heidelberg, Komori, and other leading press manufacturers)
- Textile equipment requiring compact, high-load solutions
- Agricultural machinery and construction equipment
- Gearboxes and transmissions
- Pumps, compressors, and conveyor systems
- Robotics and automation technology
- General mechanical engineering applications where space optimization is critical
Installation & Maintenance Guidelines
- Mounting: The separable design allows fitting the inner ring onto the shaft first, followed by the outer ring and roller-cage assembly. Ensure proper alignment to prevent edge loading.
- Lubrication: Requires appropriate grease or oil lubrication based on operating speed and temperature. The annular groove facilitates easy relubrication during maintenance cycles.
- Operating Conditions: Designed for continuous operation within a temperature range of -30°C to +120°C (with standard lubricants).
- Replacement Interchangeability: Directly interchangeable with equivalent models from other manufacturers, including KOYO NA4905A, IKO NA4905, and NTN NA4905R.
Quality Assurance
As a Schaeffler Group product, the INA NA4905 undergoes rigorous quality control processes throughout manufacturing, from raw material selection to final inspection. All bearings meet or exceed international ISO standards for precision, reliability, and performance, ensuring consistent operation even in demanding industrial environments.
