Turntable Bearings

YRT Bearings

Materials:

Bearing Rings and Rolling Elements: GCr15 high-carbon chromium steel (surface hardness HRC 60-62) or SUS440C stainless steel (corrosion-resistant).

Size Range:

Metric Series:

Inner diameter: 50-1200 mm

Outer diameter: 126-1490 mm

Height: 30-164 mm Accuracy

Class:-Rotational Accuracy: P4, P2

Preload Class: C0, C1, C2


Description

The double-row crossed rollers are arranged orthogonally, and the inner and outer rings feature an integrated V-shaped raceway design, which evenly distributes the load. The clearance is eliminated through pre-tightening adjustment to enhance rigidity and reduce vibration. Performance Features: Ultra-high Precision: The P4-grade precision meets the nanometer-level positioning requirements (such as semiconductor lithography). High Load-bearing Capacity: The rated dynamic load (Cr) can reach up to 610 kN. Low Friction: By optimizing the curvature of the roller end faces and the lubrication design, the temperature rise is ≤10°C (grease lubrication).
YRT Bearings

Features

Composite Load Capacity

It can simultaneously bear radial forces, bidirectional axial forces, and overturning moments.

Ultra-high Rigidity

The double-row roller layout increases the anti-deformation ability by 5 times (compared to single-row bearings).

Long Life

With the surface hardening treatment of GCr15 material, the L10 life is ≥ 30,000 hours.

Integrated Angle Measurement System

Some turntable bearings come with an integrated angle measurement system,enabling high-precision angle measurement for precise positioning and measurement applications.

Working Principle

YRT Bearings
Roller Arrangement and Load Distribution: The double rows of rollers are arranged orthogonally to form an "X"-shaped contact line, dispersing radial and axial forces. Moment loads are transmitted through the diagonals of the rollers, reducing local stress concentration. Lubrication and Sealing: Grease Lubrication: Perfluoropolyether (PFPE) lubricating grease is used, which is suitable for vacuum or high-temperature environments ranging from -30°C to 120°C. Oil Lubrication: An internal circulating oil circuit is installed, suitable for ultra-high-speed scenarios (≤1200 rpm). Thermal Management: The low-friction design and optional forced-cooling options ensure thermal stability.

Techspecs

ModelInner diameterd(mm)Outer diameterD(mm)Height
H(mm)
Axial load(kN)Radial load(kN)Overturning moment(Nm)Limiting speed(rpm)Weight
(kg)
YRT50509025168.515015000.8
YRT808013035301530012002.2
YRT12012018045502560010004.5
YRT15015022555703510008008
YRT2002002906510050160060014.5
YRT2602603707514070250050023
YRT3253254408518090360040035


Application & Case

CNC Machine Tools: Rotating worktables of five-axis machining centers, turntables of turning-milling compound machine tools.

Industrial Robots: Rotating axes of high-precision welding robots, end effectors of assembly robots.

Precision Testing Equipment: Rotating platforms of coordinate measuring machines, driving units of optical testing instruments.

Semiconductor Manufacturing: Turntables of wafer cutting machines, alignment mechanisms of lithography machines.

FAQ

The YRT bearing features a double-row crossed roller design, offering higher rigidity and is specifically designed for turntables. The RA bearing has a single-row ultra-thin design, with an emphasis on compact spaces.
Light preload (C0) is suitable for low-speed and high-precision applications, while heavy preload (C2) is used for high-dynamic load scenarios.
Yes. It requires oil lubrication and uu seals, and the maximum rotational speed can reach 1200 rpm.
Model:YRT50-YRT1200 SIZE(d):50-1200(mm)

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