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Bearing NU 4920 TNGAP DKF
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Product detailed description
The NU 4920 TNGAP DKF is a double-row cylindrical roller bearing engineered to provide high radial load carrying capacity and exceptional rigidity. This bearing is ideal for applications where durability and performance are critical.
Technical Specifications:
- Type: Double-row cylindrical roller bearing
- Bore Type: Cylindrical
- Material: Hardened alloy steel
- Cage Material: High-strength, two-piece, machined brass
- Limiting Speed (Oil Lubrication): 5100 RPM
- Limiting Speed (Grease Lubrication): 4300 RPM
- Precision: ISO Class 0
- Configuration: Two rows of rollers
- Tolerance: ISO Class 0 (RBEC 1)
- Oil Hole: Without oil hole
- Radial Internal Clearance: CN
- Static Load Rating: 26,000 N (5,850 lbf)
- Dynamic Load Rating: 131,000 N (29,500 lbf)
- Enclosure: Open
- Operating Temperature Range: -40 to 120°C (-40 to 250°F)
Dimensional Specifications:
- Inner Diameter (d): 100.000 mm (3.9370 in)
- Outer Diameter (D): 140.000 mm (5.5118 in)
- Width (B): 40.000 mm (1.5748 in)
- Cage Width (C): 40.000 mm (1.5748 in)
- Flange Width (Fw): 113.000 mm (4.4488 in)
- Radius (r): 1.100 mm (0.0433 in)
- Minimum Bore Diameter (da min): 106.500 mm (4.1929 in)
- Minimum Outer Diameter (db min): 110.000 mm (4.3307 in)
- Maximum Outer Diameter (Da max): 133.500 mm (5.2559 in)
- Minimum Outer Diameter (Db min): 131.000 mm (5.1575 in)
- Maximum Outer Diameter (Db max): 133.500 mm (5.2559 in)
- Maximum Chamfer Radius (ras max): 1.000 mm (0.0394 in)
This bearing is suitable for applications requiring high radial load capacity and rigidity, such as machine tools, industrial equipment, and automotive applications.
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DKF (Deutsche Kugellagerfabrik) is a renowned German manufacturer of industrial ball bearings. The company was established in 1904 by Friedrich Wilhelm Witte in Leipzig, and initially produced radial and axial deep groove ball bearings up to 150mm in diameter. Ten years later, DKF expanded its portfolio and started producing needle rollers and complete assembled needle roller bearings.
In 1930, DKF developed a new type of precision ball bearing known as the separating ball bearing, which could absorb both radial and axial forces simultaneously, making it a patent and later a DIN standard. In 1932, UKF Universal-Kugellager-Fabrik GmbH was founded in Berlin-Charlottenburg to offer the new designed separating ball bearing as a universal bearing to replace seven different types of angular contact ball bearings.
Over the years, DKF has continued to innovate and expand its product line, producing needle and deep groove ball bearings, radial and axial bearings, and four point contact ball bearings with split outer rings. During World War II, DKF also produced special bearings for aircraft and tank engines.
In 1945, all DKF plants were confiscated by the Soviet Union for reparation payment purposes. However, by 1947, urgently needed bearings were again made available for the German market.
In the 1960s, DKF used a fully automatic assembly line in Berlin, and in the 1980s, new NC machines were installed. In 1989, the Steyr bearing factory was sold to SKF, and former employees founded the STC-Steyr cooperation in Steyr, Austria. With the end of the GDR in 1990, DKF was sold to FAG Kugelfischer Georg Schäfer KGaA, which later sold all eight bearing plants to the Schaeffler Group in 1990.
Today, DKF Deutsche Kugellagerfabriken GmbH (DKF Group) continues the tradition of manufacturing ball bearings at its Berlin location. The group members STC-Steyr and UKF develop and produce various types and sizes of bearings. With over 80 years of experience, DKF is a trusted and reputable brand in the bearing industry, and customers can rely on their products for precision, durability, and reliability.