Super-Precision Axial-Radial Cylindrical Roller Bearings
NRT super-precision axial-radial cylindrical roller bearings are designed for rotary tables, indexing tables, milling heads, and precision positioning systems that need to support combined axial, radial, and moment loads in a compact bearing arrangement.
Unlike single row or double row super-precision cylindrical roller bearings used mainly in spindle radial support, NRT bearings are built for applications where the bearing must provide high tilting rigidity, axial stiffness, radial support, and accurate rotational positioning. This makes them suitable for equipment that requires precise table rotation rather than only high-speed spindle operation.
TFL supplies NRT axial-radial cylindrical roller bearings from NRT 80 B to NRT 850 A, covering bore diameters from 80 mm to 850 mm. Customers can compare dimensions, preload, frictional moment, axial stiffness, moment stiffness, and lubrication speed according to their rotary table or positioning system requirements.
Axial-Radial Bearing Design for Rotary Table Accuracy
NRT axial-radial cylindrical roller bearings are designed to support axial loads, radial loads, and tilting moments in one compact bearing unit. This makes them different from standard cylindrical roller bearings, which are mainly selected for radial support in spindle or shaft arrangements.
In rotary tables and indexing systems, the bearing must keep the table stable during cutting, positioning, clamping, and repeated rotation. NRT bearings provide high axial stiffness and moment stiffness, helping reduce table deflection and maintain positioning accuracy under combined load conditions.
This page focuses on super-precision axial-radial bearing arrangements, not high-speed spindle bearings. For applications such as CNC rotary tables, vertical turning tables, milling heads, and precision indexing units, NRT bearings are often more relevant than single row or double row spindle cylindrical roller bearings.
Selecting NRT Bearings by Preload, Stiffness and Table Size
Selection of an NRT rotary table bearing usually starts with the required table size and bearing bore diameter. The product range includes models such as NRT 80 B, NRT 120 B, NRT 200 B, NRT 325 B, NRT 460 A, NRT 650 A, and NRT 850 A, covering small precision tables through large positioning systems.
Beyond basic dimensions, buyers should compare axial preload, axial unloading force, frictional moment, axial stiffness, and moment stiffness. These values are important because rotary table bearings must resist tilting and maintain accurate positioning, especially when the machine is exposed to cutting force or uneven workpiece load.
If you are not sure which NRT model fits your rotary table, send TFL the old bearing number, table drawing, bore diameter, outside diameter, mounting hole layout, load condition, or required positioning accuracy. Our team can help check whether the selected bearing size and stiffness level are suitable for your equipment.
Mounting Holes, Lubrication Speed and Replacement Checks
NRT axial-radial bearings include detailed mounting features such as inner ring and outer ring hole pitch circle diameters, through holes, sinkholes, and chamfer dimensions. These details matter because the bearing is often mounted directly into a rotary table, indexing table, or precision positioning structure.
The product data also separates attainable speed for grease lubrication and attainable speed for oil-air lubrication. For example, smaller NRT bearings can run at higher speeds, while larger models such as NRT 650 A and NRT 850 A are selected more for stiffness and load capacity than speed.
When replacing an existing axial-radial bearing, buyers should confirm the complete model number, bore diameter, outside diameter, width, mounting hole pattern, preload, frictional moment, and lubrication method. TFL can help review these details before quotation to reduce the risk of selecting a bearing that fits dimensionally but does not match the machine’s stiffness or mounting requirements.
FREQUENTLY ASKED QUESTIONS
What are NRT axial-radial cylindrical roller bearings used for?
NRT axial-radial cylindrical roller bearings are mainly used in rotary tables, indexing tables, milling heads, vertical turning tables, and precision positioning systems. They support combined axial, radial, and moment loads in one compact bearing arrangement.
How are NRT bearings different from single row spindle cylindrical roller bearings?
Single row super-precision cylindrical roller bearings are mainly used for high-speed spindle radial support. NRT axial-radial bearings are used for rotary table and positioning applications where axial load, radial load, tilting moment, and mounting rigidity must be considered together.
What information is important when selecting an NRT bearing?
Important selection data includes the part number, bore diameter, outside diameter, width, axial preload, frictional moment, moment stiffness, lubrication method, and mounting hole layout. For replacement projects, the old bearing marking or machine drawing is also helpful.
Can NRT bearings be used with grease or oil lubrication?
Yes. The NRT series data includes attainable speeds for both grease lubrication and oil-air lubrication. The correct lubrication method depends on table speed, load condition, machine design, and maintenance requirements.
Can TFL help identify the correct NRT replacement model?
Yes. TFL can help identify the correct NRT super-precision axial-radial cylindrical roller bearing based on the old part number, bearing photo, rotary table drawing, dimensions, or mounting hole pattern.