The YRT80 is a high-precision, combined axial-radial bearing (commonly referred to as a turntable bearing or rotary table bearing) manufactured to DIN 616 / ISO 104 standards. It is specifically engineered to accommodate simultaneous axial loads, radial loads, and tilting moments with extremely high running accuracy and rigidity.

This bearing type is the industry standard for applications requiring precise rotary motion, particularly in machine tools and measurement equipment.

1. Design and Construction
The YRT80 features a unique integrated design consisting of several key components:
– Solid Bearing Rings: An inner ring and an outer ring made from bearing steel.
– Two Row Cylindrical Roller Arrangements: It contains two independent sets of rollers. One set is arranged axially (90-degree contact) to handle thrust loads in both directions, while the other set is arranged radially to guide the rotation and handle radial forces.
– High-Precision Cage: Made from brass or polyamide, it ensures even roller spacing and reduces friction.
– Pre-Drilled Mounting Holes: A defining feature of the YRT series. Both the inner and outer rings come with evenly distributed through-holes or threaded bores. This allows for direct bolt fixation to machine interfaces without the need for complex clamping or additional retaining rings, simplifying installation and ensuring a rigid connection.

2. Technical Specifications (YRT80)
The specific dimensions and load ratings for the YRT80 are standardized:
– Bore Diameter (d): 80 mm
– Outer Diameter (D): 146 mm
– Height (H): 35 mm
– Load Ratings (Approximate):
– Axial load rating (dynamic/static): High bidirectional capacity (typically in the range of 50–100 kN depending on direction).
– Radial load rating: Moderate radial capacity.
– Precision: Typically manufactured to P4 or P2 running accuracy, ensuring minimal radial runout and axial runout.

3. Key Features
– High Running Accuracy: The YRT80 ensures extremely low runout tolerances, making it suitable for tasks where concentricity and perpendicularity are critical.
– High Rigidity: Due to the preload generated by the axial roller arrangement and the robust ring design, the bearing exhibits very low elastic deformation under load.
– Combined Load Capability: It can simultaneously support heavy axial loads (in both directions), radial forces, and tilting moments from a single, compact unit.
– Ease of Mounting: The integrated mounting holes eliminate the need for auxiliary locking elements, allowing for a simplified and highly rigid bolt-on connection.

4. Common Applications
The performance characteristics of the YRT80 make it ideal for:
– Rotary Tables: The primary application for milling, grinding, and EDM rotary tables.
– Indexing Tables: For precise positioning in automation and assembly lines.
– Direct Drives: Integration with torque motors in high-speed, high-precision rotary axes.
– Antenna and Radar Systems: Where precise azimuth positioning is required.
– Medical Technology: In CT scanners or other large rotating gantries.

5. Installation Guidelines
To achieve the specified performance from a YRT80 bearing:
1. Surface Preparation: The mating surfaces on the housing and shaft must be machined to a high degree of flatness and perpendicularity to avoid distortion.
2. Bolt Fixation: Use high-strength bolts (usually property class 10.9 or 12.9) tightened to the specified torque to ensure the bearing rings are securely clamped.
3. Lubrication: The bearing is typically supplied with a high-quality grease suitable for a wide temperature range. Regular relubrication is required based on duty cycle.

The YRT80 is a high-performance, ready-to-mount unit that combines the functions of an axial bearing, a radial bearing, and a moment bearing into one compact, precise, and rigid package. Its standardized dimensions and bolt-fixing design make it the preferred choice for engineers building precision rotary axes in machine tools and industrial automation.

Combined bearing 4.063

D=149mm

H=78.5mm

h=58.5mm

d=60mm

T=103mm

Combined bearing 4.064

D=149mm

H=86mm

h=67mm

d=60mm

T=108mm

The new finished U profile stud type track roller bearings with ball & cage structure, the oil seal design can prevent the contaminants outside.

The bearings can support high radial- and axial forces in both directions. The special curved shape of the outer ring creates two contact surfaces with the guide rail.

With these track roller bearings, carriages will run quickly and quietly on guide rails.

These track rollers are lubricated and maintenance-free during their service-life.

The double roller back-up rollers with pin back-up rolls mainly used in the flattening and straightening lines of steel, stainless steel and aluminium sheets. The outer rings and the shaft are made in hardening and tempering steel with high hardness (up to 62 HRc). The shaft can be made also in case hardening steel in relations to the dimensions. They are available with sealing system (lamellar double or triple rings), thermoplastic seals and labyrinth system.

The internal design with needle roller and cage assembly or full complement rollers, so it can bear very high radial load capacity. The backup rollers work with the work rolls and the intermediate rolls in the levelling lines.

NNTR 80X200X90.2ZL support roller, backup roller, yoke type track roller

Outside dia.: 200mm

Bore dia.: 80mm

Width: 90mm

Weight: 16.8kg

NNTR 80X200X90.2ZL Support roller (yoke-type track roller), backup roller with flange rings, integral sealing and relubrication feature, they are designed to run on all types of tracks and to be used in cam drives, conveyor systems, etc.

Very high radial load carrying capacity
Accommodate relatively heavy axial loads due to skew or tilting
Long service life
Easy to mount
Sealed for increased reliability, with relubrication feature