Crossed Roller Bearings High‑Precision for Robot & CNC Rotary Table

Crossed Roller Bearings High‑Precision for Robot & CNC Rotary Table

Crossed roller bearings adopt 90° crossed cylindrical rollers, can bear radial, axial and tilting moment loads simultaneously. Compact size, ultra‑high rotational accuracy, widely used in industrial robots, precision rotary tables, medical devices and semiconductor machinery. Hongjing offer standard series and custom non‑standard solutions.

What is Crossed Roller Bearing

Crossed roller bearings are precision rolling bearings with cylindrical rollers arranged orthogonally at 90° in V‑shaped raceways. One single bearing can withstand radial load, bidirectional axial load and tilting moment load at the same time. The compact design replaces multiple bearing combinations, saving installation space, delivering high rigidity and excellent rotational accuracy. Available in P5 / P4 / P2 precision grades, with spacer retainer or full‑complement roller options.

Main Series of Crossed Roller Bearings

RB Series (Outer Ring Split, Inner Ring Rotation)

Basic standard series, split outer ring, integral inner ring. Optimized for inner‑ring high‑speed rotation, widely used for robot joints and rotary tables.

Hongjing RB bearing.jpg

RE Series (Inner Ring Split, Outer Ring Rotation)

Same dimension as RB series, split inner ring, integral outer ring. Ideal for outer‑ring rotation applications.

RE cross roller bearing.jpg

RU Series (Integral Inner & Outer Ring with Mounting Holes)

Integrated inner & outer ring with pre‑drilled mounting holes. No extra flange required, easy installation, stable rotation performance. Suitable for both inner‑ring and outer‑ring rotation.

Hongjing RU bearing.jpg

CRB / CRBC Series (IKO Compatible)

High‑rigidity crossed roller bearings, CRBC with sealed design. Suitable for heavy‑load precision rotating units.

交叉滚子轴承CRBH.png

RA / SX Ultra‑Thin Series

Ultra‑thin cross‑section, lightweight compact structure. Perfect for space‑limited robotic joints, miniature precision instruments.

RA thin wall bearing.jpg

Series	Structure	Precision Grade	Main Feature	Typical Application
RB	Outer ring split	P5/P4/P2	Inner‑ring rotation	Robot joints, rotary table
RE	Inner ring split	P5/P4/P2	Outer‑ring rotation	Rotary unit
RU	Integral ring with mounting holes	P5/P4/P2	No flange needed	Robot, turntable
CRBC	Sealed full‑complement	P5/P4	Heavy‑load sealed	Precision machinery
RA/SX	Ultra‑thin section	P5/P4	Lightweight compact	Mini‑robot, instrument

Key Advantages

✅ Simultaneously bear radial, axial & tilting moment loads

✅ Ultra‑high rigidity, minimal elastic deformation

✅ High rotational accuracy, low backlash

✅ Compact structure, reduce assembly space

✅ Adjustable preload for optimal performance

✅ Standard & custom non‑standard designs supported

Typical Applications

• Industrial robot joints, collaborative robot rotary units

• CNC machine tool rotary tables, indexing tables

• Medical imaging equipment, CT / MRI rotating parts

• Semiconductor equipment, lithography & inspection machines

• Precision measuring instruments, optical equipment

• Automation rotary platforms, turntable equipment

Series	Equivalent Model	Ring Structure	Recommended Rotation	Mounting Holes
RB	CRBC (IKO)	Outer‑ring split, inner‑ring integrated	Inner‑ring rotation	No mounting holes
RE	‑	Inner‑ring split, outer‑ring integrated	Outer‑ring rotation	No mounting holes
RU	CRBH (IKO)	Fully‑integrated inner & outer ring	Inner or outer‑ring rotation	Inner & outer ring mounting holes
CRBC	RB (THK)	Outer‑ring split, inner‑ring integrated	Inner‑ring rotation	No mounting holes
CRBH	RU (THK)	Fully‑integrated inner & outer ring	Inner or outer‑ring rotation	No mounting holes
CRBS	RA (THK)	Fully‑integrated inner & outer ring	Inner or outer‑ring rotation	No mounting holes
RA	CRBS (IKO)	Fully‑integrated inner & outer ring	Inner or outer‑ring rotation	No mounting holes
SX	XSU (INA)	Fully‑integrated inner & outer ring	Inner or outer‑ring rotation	No mounting holes
Custom Non‑Standard	‑	Custom design per drawing	Custom rotation	Custom holes