DKFL NA 4911 Needle Roller Bearing
Machined needle roller bearings are valued in engineering applications for their small cross-section and exceptionally high load capacity. The NA 4911 consists of an outer ring, a rigid cage, precision needle rollers, and a separate inner ring. The inner ring makes it suitable for use with shafts that are not hardened and ground.
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Product Detail
Machined Needle Roller Bearing with Inner Ring DKFL NA 4911 Dimensions 55×80×25 mm | Compact Design, High Radial Load Capacity, and Exceptional Durability
The DKFL NA 4911 needle roller bearing, featuring a precisely engineered design and a separate inner ring, is an ideal choice for applications with limited radial space and very heavy radial loads. This industrial-quality product is supplied by Kamyar Gostar Iranian (KGICO).
Technical Overview of the DKFL NA 4911 Needle Roller Bearing
Machined needle roller bearings are valued in engineering applications for their small cross-section and exceptionally high load capacity. The NA 4911 consists of an outer ring, a rigid cage, precision needle rollers, and a separate inner ring. The inner ring makes it suitable for use with shafts that are not hardened and ground.
The separate inner ring, indicated by the NA designation, simplifies installation and removal, while supporting smooth, stable operation at higher speeds and under fluctuating mechanical stresses.
Designation and Structural Analysis (NA 4911)
Prefix NA: Indicates a machined needle roller bearing supplied with a separate inner ring.
Series 49: Identifies a compact-section needle roller bearing series with standardized dimensions.
Number 11: The bore code; 11 × 5 gives a 55 mm shaft diameter.
DKFL Brand: Manufactured from alloy steels designed to resist fatigue and wear, with dimensional tolerances suited to industrial applications.
Distribution and Support: Supplied by Kamyar Gostar Iranian (KGICO), with product authenticity and quality assurance.
Technical Specifications and Dimensions
| Bore (d) | Outside Diameter (D) | Width (B) | Dynamic Load (Cr) | Static Load (C0r) | Approx. Weight | Reference Speed |
|---|---|---|---|---|---|---|
| 55 mm | 80 mm | 25 mm | ~57.6 kN | ~97.3 kN | ~0.41 kg | ~6,300 rpm |
Key Features and Competitive Advantages of the DKFL NA 4911
Compact Cross-Section
A space-saving design that makes efficient use of applications with limited radial installation space.
Very High Radial Load Capacity
A high number of needle rollers helps the bearing withstand heavy loads and mechanical shock.
Separate Inner Ring
Offers greater shaft design flexibility and reduces dependence on a hardened shaft surface at the bearing position.
Rigid Cage and Precise Guidance
The engineered cage accurately guides the rollers, helping limit friction and heat during operation.
Durable DKFL Materials
Made from specialized steel and heat-treated to support reliable service life.
Professional Supply by KGICO
Technical support and access to authentic industrial products through Kamyar Gostar Iranian.
Common Industrial Applications
- Industrial and automotive gearboxes: High-speed, heavily loaded shafts where radial installation space is limited.
- Machine tools and turning equipment: Rotary drive mechanisms requiring accurate operation.
- Heavy-duty pumps and compressors: Internal hydraulic and power-transmission components.
- Textile and printing industries: Rollers and rotary equipment subject to concentrated radial loads.
- Mechanical power-transmission systems: Planetary gearboxes and general industrial drive systems.
Installation, Maintenance, and Engineering Recommendations
Needle roller bearings are designed to support radial loads and are not intended to carry pure axial loads. Where axial loads are present, use suitable complementary bearings, such as thrust bearings.
When pressing the rings onto the shaft or into the housing, use the correct tools and apply force evenly to avoid damaging the precision roller and raceway surfaces.
Use Appropriate Lubrication
Given the bearing’s operating speed and load, use a suitable high-quality grease or oil and carry out periodic inspections to help extend service life.
Frequently Asked Questions (FAQ)
1. What is the main advantage of the NA 4911 needle roller bearing over conventional ball bearings?
Its compact cross-section allows it to support significantly heavier radial loads in applications with limited installation space.
2. What does the NA prefix in this product designation mean?
The NA prefix identifies a machined needle roller bearing supplied with a separate inner ring, making it easier to install on a shaft.
3. What are the dimensions and load capacity of the DKFL NA 4911?
It has a 55 mm bore, an 80 mm outside diameter, and a 25 mm width. Its radial dynamic load rating is approximately 57.6 kN.
Request a Quote for the DKFL NA 4911 Needle Roller Bearing
For stock availability, wholesale pricing, and technical consultation, contact the team at Kamyar Gostar Iranian (KGICO).
Inquire and Order at kgico.co