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Super-Precision Axial-Radial Cylindrical Roller Bearings NRT 325 B

Super-Precision Axial-Radial Cylindrical Roller Bearings NRT 325 B

The NRT 325 B is a super-precision cylindrical roller bearing with a 325mm bore and 450mm outer diameter, designed for combined loads. Made from chrome steel, it handles radial loads up to 134 kN and axial loads up to 153 kN.

Its brass cage ensures smooth operation, while the grease or oil lubrication options allow speeds of 110 to 220 r/min. The bearing works in temperatures from -30°C to 110°C, making it versatile for various conditions.

With a weight of 25kg, it’s robust yet manageable for industrial use. Ideal for heavy machinery or precision equipment where both radial and axial loads are present. Compliant with RoHS and REACH standards for safety and environmental care.

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Product Parameters

  • Part Number NRT 325 B
  • Size 325 mm x 450 mm x 60 mm
  • System of Measurement Metric
  • Roller Bearing Type Cylindrical
  • For Load Direction Combined
  • Bore Dia 325 mm
  • Bore Dia Tolerance -0.023mm to 0
  • Outer Dia 450 mm
  • Outer Dia Tolerance -0.023mm to 0
  • Width 60 mm
  • Height Tolerance -0.40mm to 0
  • Shoulder Diameter Inner Ring - Large Shoulder 415 mm
  • Outer Ring (Housing Washer) Width 20 mm
  • Distance 40 mm
  • Inner Ring (Shaft/Locating Washer) Hole Pitch Circle Diameter 342 mm
  • Outer Ring (Housing Washer) Hole Pitch Circle Diameter 430 mm
  • Inner Ring (Shaft/Locating Washer) Through Hole 9.3 mm
  • Inner Ring (Shaft Washer) Sinkhole 15 mm
  • Outer Ring (Housing Washer) Through Hole 9.3 mm
  • Inner Ring (Shaft Washer) Sinkhole Depth 8.2 mm
  • Outer Ring (Housing Washer) Chamfer Dimension r1 (min.) 0.6 mm
  • Chamfer Dimension r2 (min.) 0.6 mm
  • Basic Dynamic Load Rating - Radial Direction 134 kN
  • Basic Static Load Rating - Radial Direction 450 kN
  • Basic Dynamic Load Rating - Axial Direction 153 kN
  • Attainable Speed For Grease Lubrication 110 r/min
  • Attainable Speed For Oil-Air Lubrication 220 r/min
  • Axial Preload 12 kN
  • Axial Unloading Force 26 kN
  • Frictional Moment 45 N·m
  • Axial Stiffness For Preload A (sets of two brgs back-to-back or face-to-face) 28600000 kN/µm
  • Axial Stiffness For Preload B (sets of two brgs back-to-back or face-to-face) 8900000 kN/µm
  • Moment Stiffness 427 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 25 kg

Features

Performance Features of NRT 325 B Bearing

NRT 325 B Bearing is designed for combined load applications, with a basic dynamic load rating of 134 kN in the radial direction and 153 kN in the axial direction.
Its chrome steel construction ensures durability and resistance to wear in demanding conditions.

The bearing’s brass cage maintains roller alignment, enhancing operational stability and reducing friction.
With attainable speeds of 110 r/min for grease lubrication and 220 r/min for oil-air lubrication, it offers flexibility in various industrial settings.

NRT 325 B Bearing’s axial stiffness ranges from 8,900,000 kN/µm to 28,600,000 kN/µm, providing reliable performance under different preload conditions.
Its temperature range of -30° to 110 °C ensures consistent operation in diverse environments.

The bearing’s precise dimensions (325 mm x 450 mm x 60 mm) and tight tolerances make it suitable for high-precision applications.
Its robust design and high load capacity make it a dependable choice for heavy-duty machinery.

Application

Industrial Uses of NRT 325 B Bearing
NRT 325 B Bearing is commonly used in heavy industrial machinery, such as large lathes and milling machines, where its combined load capacity handles both radial and axial forces efficiently. The chrome steel construction ensures durability in demanding environments.

In wind turbines, NRT 325 B Bearing supports the main shaft, providing reliable performance under varying loads and speeds. Its brass cage helps reduce friction, extending service life in these critical applications.

For railway applications, NRT 325 B Bearing is found in axle boxes, where its high stiffness and load ratings ensure smooth operation. The metric dimensions make it compatible with European and Asian rail systems.

Automotive vs Aerospace: Applications of NRT 325 B Bearing
In automotive testing rigs, NRT 325 B Bearing handles high loads and speeds, ensuring accurate performance measurements. Its grease lubrication option simplifies maintenance in these settings.

Aerospace applications benefit from NRT 325 B Bearing’s precision in landing gear systems, where reliability is paramount. The oil-air lubrication option allows for higher speeds in these specialised environments.

Key Fields for NRT 325 B Bearing
NRT 325 B Bearing is ideal for large pumps in the oil and gas industry, where its axial-radial design manages complex loads. The temperature range suits both hot and cold operating conditions.

In paper manufacturing, NRT 325 B Bearing supports rollers, ensuring consistent performance under heavy loads. The brass cage material resists corrosion from moisture in these environments.

Q&A

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