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Super-Precision Axial-Radial Cylindrical Roller Bearings NRT 650 A

Super-Precision Axial-Radial Cylindrical Roller Bearings NRT 650 A

The NRT 650 A is a super-precision cylindrical roller bearing with a large 650mm bore and 870mm outer diameter, designed to handle both radial and axial loads. Made from durable chrome steel, it supports dynamic loads up to 413 kN radially and 365 kN axially.

Its brass cage ensures smooth operation, while the design allows speeds of 55 r/min with grease lubrication or 110 r/min with oil-air lubrication. The bearing can handle axial preloads up to 27 kN, making it stable under heavy loads.

With a temperature range of -30°C to 110°C, it’s suitable for demanding environments. The large size and high stiffness make it ideal for heavy machinery like turbines or large industrial equipment.

Weighing 170kg, it’s built for robust performance. Compliant with RoHS and REACH standards, it’s a reliable choice for precision applications.

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Product Parameters

  • Part Number NRT 650 A
  • Size 650 mm x 870 mm x 122 mm
  • System of Measurement Metric
  • Roller Bearing Type Cylindrical
  • For Load Direction Combined
  • Bore Dia 650 mm
  • Bore Dia Tolerance -0.04mm to 0
  • Outer Dia 870 mm
  • Outer Dia Tolerance -0.045mm to 0
  • Width 122 mm
  • Height Tolerance -0.70mm to 0
  • Shoulder Diameter Inner Ring - Large Shoulder 800 mm
  • Outer Ring (Housing Washer) Width 34 mm
  • Distance 78 mm
  • Inner Ring (Shaft/Locating Washer) Hole Pitch Circle Diameter 680 mm
  • Outer Ring (Housing Washer) Hole Pitch Circle Diameter 830 mm
  • Inner Ring (Shaft/Locating Washer) Through Hole 14 mm
  • Inner Ring (Shaft Washer) Sinkhole 20 mm
  • Outer Ring (Housing Washer) Through Hole 14 mm
  • Inner Ring (Shaft Washer) Sinkhole Depth 13 mm
  • Outer Ring (Housing Washer) Chamfer Dimension r1 (min.) 1 mm
  • Chamfer Dimension r2 (min.) 1 mm
  • Basic Dynamic Load Rating - Radial Direction 413 kN
  • Basic Static Load Rating - Radial Direction 1600 kN
  • Basic Dynamic Load Rating - Axial Direction 365 kN
  • Attainable Speed For Grease Lubrication 55 r/min
  • Attainable Speed For Oil-Air Lubrication 110 r/min
  • Axial Preload 27 kN
  • Axial Unloading Force 59 kN
  • Frictional Moment 200 N·m
  • Axial Stiffness For Preload A (sets of two brgs back-to-back or face-to-face) 60000000 kN/µm
  • Axial Stiffness For Preload B (sets of two brgs back-to-back or face-to-face) 17200000 kN/µm
  • Moment Stiffness 3209 kN·m/mrad
  • Ring Material Chrome Steel
  • Roller Material Chrome Steel
  • Cage Material Brass
  • Lubrication Grease, Oil
  • Temperature Range -30° to 110 °C
  • RoHS Compliant
  • REACH Compliant
  • Weight 170 kg

Features

Performance Features of NRT 650 A Bearing

NRT 650 A Bearing is designed for combined load applications, with a bore diameter of 650 mm and outer diameter of 870 mm.
Its chrome steel rings and rollers provide excellent durability, handling dynamic radial loads up to 413 kN.

The brass cage ensures smooth operation, even under high axial preloads of 27 kN.
With grease lubrication, it achieves speeds of 55 r/min, while oil-air lubrication allows for 110 r/min.

NRT 650 A Bearing operates in temperatures from -30° to 110°C, making it suitable for various environments.
Its axial stiffness reaches 60,000,000 kN/µm, ensuring stability in demanding conditions.

The bearing’s weight of 170 kg reflects its robust construction, built for long-term reliability.
Its compliance with RoHS and REACH standards ensures environmental and safety adherence.

Application

Industrial Uses of NRT 650 A Bearing
NRT 650 A Bearing is commonly used in heavy industrial machinery, such as large gearboxes and rolling mills, where combined axial and radial loads are present. Its robust design ensures reliable performance even under demanding conditions.
The bearing’s high load capacity makes it suitable for wind turbine applications, where it handles significant forces while maintaining smooth operation. Brass cage construction adds durability, reducing wear over time.

Where Is NRT 650 A Bearing Used?
In steel production plants, NRT 650 A Bearing supports rolling equipment, providing stability under extreme loads. Its precise tolerances help maintain alignment in high-stress environments.
For marine applications, this bearing is ideal for propeller shafts, offering resistance to corrosion and consistent performance in harsh conditions.

Optimized for Performance: NRT 650 A Bearing
NRT 650 A Bearing excels in paper manufacturing machinery, where its axial-radial load handling keeps production lines running smoothly. The chrome steel rollers enhance longevity.
In mining equipment, this bearing’s grease lubrication option ensures reliable operation in dusty environments. Its large size accommodates heavy-duty requirements.

Automotive vs Aerospace: Applications of NRT 650 A Bearing
In automotive testing rigs, NRT 650 A Bearing provides precise load handling for durability assessments. Its high stiffness ensures accurate measurements.
For aerospace ground support equipment, the bearing’s temperature range suits various climates. Oil-air lubrication allows for higher speeds when needed.

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