ZKL NJ311 Single Row Cylindrical Roller Bearing

Description:

The ZKL NJ311 Single Row Cylindrical Roller Bearing is used in industrial rotating systems to support high radial loads while allowing axial displacement of the shaft relative to the housing. Commonly installed in electric motors, gearboxes, machine tools, and heavy machinery requiring rigid support and high-speed performance. Maintenance teams, mechanical engineers, and system integrators use this part for repair, retrofit, or replacement to ensure reliable operation and extended equipment life.

Applications:

The ZKL NJ311 bearing is widely used in heavy-duty industrial applications such as large electric motors, pumps, rolling mills, and machine tool spindles where high radial load capacity and rigidity are critical. Its cylindrical roller design allows it to handle heavy loads and operate efficiently at higher speeds, while also accommodating axial movement, making it suitable for applications with thermal expansion or shaft displacement.

Technical Specifications:

• Manufacturer: ZKL
• Model / Part Number: NJ311
• Product Type: Single Row Cylindrical Roller Bearing
• Bore Diameter (d): 55 mm
• Outer Diameter (D): 120 mm
• Width (B): 29 mm
• Weight: Approx. 1.45–1.5 kg
• Bearing Type: Cylindrical roller (NJ design – one rib on inner ring, two on outer)
• Dynamic Load Rating: ~108 kN
• Static Load Rating: ~100 kN
• Reference Speed: ~5300 rpm (grease), ~6300 rpm (oil)
• Cage Type: Steel cage (standard)
• Function: Supports high radial loads and allows axial displacement
• Material: Bearing-grade steel

Common Replacements:

• SKF NJ311 ECP Cylindrical Roller Bearing
• FAG NJ311-E-TVP2 Cylindrical Roller Bearing
• NSK NJ311ET Cylindrical Roller Bearing