DKFL NA 4915 Needle Roller Bearing
Machined needle roller bearings are recognized as one of the most efficient industrial bearings in compact power transmission systems. The NA 4915 model comprises a solid ground outer ring with a lubrication groove and hole, a precise needle guiding cage, a dense complement of chrome-steel needle rollers, and an independent ground inner ring.
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Product Detail
Machined Needle Roller Bearing with Inner Ring DKFL NA 4915 Dimensions 75×105×30 mm | Narrow Cross-Section, Exceptional Radial Load Capacity, and High Wear Resistance
The DKFL NA 4915 industrial needle roller bearing, featuring a precision-machined structure with a separate inner ring and an integrated cage, is an ideal and reliable solution for handling heavy radial loads within restricted mounting spaces. Distributed with authenticity assurance and technical supervision by Kamyar Gostar Iranian (KGICO).
Technical Overview and Nature of the NA 4915 Series
Machined needle roller bearings are recognized as one of the most efficient industrial bearings in compact power transmission systems. The NA 4915 model comprises a solid ground outer ring with a lubrication groove and hole, a precise needle guiding cage, a dense complement of chrome-steel needle rollers, and an independent ground inner ring.
The presence of a separate inner ring in this bearing type (denoted by the NA prefix) allows for precise assembly on the shaft with optimal fit and tolerance, without requiring direct surface hardening and grinding of the shaft itself. Furthermore, the robust cage design ensures parallel, vibration-free rotation of the needles at high operating speeds while preventing heat accumulation under concentrated loads.
Designation and Structural Analysis (NA 4915)
NA Prefix: Indicates a machined, solid needle roller bearing supplied with a separate inner ring.
Dimension Series 49: Specifies the ISO international standard for compact needle roller bearings with high load-carrying capacity relative to their sectional volume.
Size Code 15: Defines the bore diameter; multiplying 15 by 5 yields 75 mm for standard shaft mounting.
DKFL Brand Material: Manufactured from alloy bearing steel (100Cr6) subjected to precise heat treatment, dimensional stabilization, and micro-finishing of contact surfaces.
Engineering Supply & Support: Direct import, quality assurance, and specialized technical support under the supervision of Kamyar Gostar Iranian (KGICO).
Technical Specifications and Dimensions Table
| Bore (d) | Outside Diameter (D) | Width (B) | Dynamic Load (Cr) | Static Load (C0r) | Approx. Weight | Reference Speed (Grease/Oil) |
|---|---|---|---|---|---|---|
| 75 mm | 105 mm | 30 mm | ~82.5 - 88.0 kN | ~155.0 - 175.0 kN | ~0.88 kg | ~4,500 - 5,300 rpm |
Key Features and Competitive Advantages of DKFL NA 4915
Extremely Compact Cross-Section
With a 30 mm width and 105 mm outer diameter, radial space is minimized, enabling equipment and housing miniaturization.
Outstanding Static & Dynamic Load Capacity
High needle roller density and linear contact maximize resistance to heavy contact stresses and shock loads.
Simplified Assembly with Separate Inner Ring
Independent mounting of the inner ring on the shaft and the bearing assembly in the housing makes installation and periodic maintenance fast and secure.
Precise and Rigid Steel Cage
Engineered cage design prevents side friction between needles, ensuring uniform lubrication and quiet operation at high speeds.
DKFL Anti-Wear Material
High-purity, controlled-hardness material delivers superior fatigue life (L10) in demanding industrial environments.
KGICO Support & Authenticity
Guaranteed genuine parts, expert replacement consultation, and component selection by Kamyar Gostar Iranian.
Common Heavy Industrial Applications
- Heavy Industrial and Planetary Gearboxes: Shafts supporting sun gears and intermediate gears operating under high torque and crushing radial loads.
- Metal Forming Machinery, Presses, and Rolling Mills: Shock-loaded equipment requiring extremely high static load capacities.
- High-Pressure Hydraulic Pumps and Motors: Piston-driven shafts with restricted outer diameter space limitations.
- Construction Equipment, Cranes, and Hoists: Heavy pulleys, moving sheaves, and hydraulic arm mechanisms.
- Textile Machinery, Printing Presses, and Industrial Rollers: Continuous-speed production line drive rollers with limited axial pressure.
Installation Guidelines and Engineering Warnings
Radial needle roller bearings of the NA series are designed exclusively to support pure radial loads. If axial load components exist on the shaft, simultaneous use of thrust bearings or axial washers is mandatory.
When mounting the bearing, never apply installation force or impacts directly to the cage or needle rollers. Force must be applied exclusively to the ring having the interference fit (inner ring on the shaft or outer ring in the housing) using appropriate tools.
Uniform Lubrication Supply
The outer ring of this bearing features a lubrication groove and hole; when positioning in the housing, align the grease/oil inlet hole precisely with the equipment's lubrication port to keep the needles cooled and lubricated along their entire path.
Frequently Asked Questions (FAQ)
1. What are the main dimensions of the DKFL NA 4915 needle roller bearing?
This bearing features a 75 mm bore diameter, a 105 mm outside diameter, and a total width of 30 mm.
2. What is the difference between the NA 4915 and RNA 4915 series?
The NA model includes an inner ring supplied with the bearing, whereas the RNA model lacks an inner ring and mounts directly onto a hardened and ground shaft surface.
3. Is the NA 4915 bearing resistant to shock loads?
Yes, due to the linear contact surface of the needles and extremely high static load capacity (~160 kN), it provides remarkable resistance against industrial impacts and vibrations.
Request a Quote and Buy DKFL NA 4915 Needle Roller Bearing
To obtain comprehensive technical specifications, check stock availability, and purchase genuine products without intermediaries, contact the technical experts at Kamyar Gostar Iranian.
Submit Inquiry at kgico.co