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Cross Roller Bearings

CRBT crossed roller bearing

CRBT crossed roller bearings are specifically designed for space-constrained high-precision applications, featuring an integral ultra-thin inner and outer ring structure with precision-ground raceways and 90° orthogonal "X"-shaped cylindrical rollers. They can simultaneously bear radial, axial, and moment loads, with excellent compactness, high rigidity, and low-noise performance. The ultra-thin design eliminates space limitations for small equipment, making them ideal for collaborative robots, special service robots, micro mechanical arms, precision instruments, and other devices requiring reliable load-bearing and precise rotation. They fully meet international technical standards and can replace imported bearings of brands such as IKO/THK.

Features:

Inner & Outer Rings: Integral ultra-thin structure with precision-ground integrated raceways (reduces runout errors and saves space);

Roller Arrangement: 90° orthogonal "X"-shaped cylindrical rollers (simultaneously bears radial, axial, and moment loads)

Accuracy Classes:

Rotational Accuracy: P5, P4, P2

Size:

Metric Series:

Inner Diameter: 10–100 mm;Outer Diameter: 21–111 mm;Cross-section Height: 5mm

Materials:

Bearing Rings & Rollers: GCr15 high-carbon chromium steel (surface hardness HRC 60-62) or SUS440C stainless steel (corrosion-resistant);

Cages: Nylon 66 (lightweight, low friction, low noise), brass (high strength, wear-resistant), or custom composite materials

Sealing Options:

Open Type: Requires regular external lubrication, suitable for clean and low-dust precision equipment environments;

Contact Rubber Seals (UU/U): Dustproof and splash-proof, suitable for complex working conditions such as industrial sites and humidity

Delivery/Customization:

Standard models: 7–15 days;

Customized models (including ultra-thin size optimization and hole diameter customization): Negotiated according to design complexity; OEM cooperation and import substitution solutions supported

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Techspecs

Cross Roller Bearing CRBT Series
Shaftdia(mm)	NB Number	Boundary dimensions(mm)				Mounting		Basic dynamic	Basic static	Mass
		Boundary dimensions(mm)				dimensions (mm)		load rating c	load rating C0	(Ref.)g
		d	D	B	rmin	da	Da	N	N	(Ref.)g
10	NB.CRBT105	10	21	5	0.15	12.5	17	1120	811	9
15	NB.CRBT155	15	26	5	0.15	17.5	22	1320	1110	11.9
20	NB.CRBT205	20	31	5	0.15	22.5	27	1400	1290	14.8
25	NB.CRBT255	25	36	5	0.15	27.5	32	1650	1770	18
30	NB.CRBT305	30	41	5	0.15	32.5	37	1770	1970	20.7
35	NB.CRBT355	35	46	5	0.15	37.5	42	2050	2420	24
40	NB.CRBT405	40	51	5	0.15	42.5	47	2200	2520	26.5
45	NB.CRBT455	45	56	5	0.15	47.5	52	2300	3090	29
50	NB.CRBT505	50	61	5	0.15	52.5	57	2280	3200	32.3
55	NB.CRBT555	55	66	5	0.15	57.5	62	2530	3790	35
60	NB.CRBT605	60	71	5	0.15	62.5	67	2630	4090	38
65	NB.CRBT655	65	76	5	0.15	67.5	72	2710	4290	41
70	NB.CRBT705	70	81	5	0.15	72.5	77	2810	4680	44
75	NB.CRBT755	75	86	5	0.15	77.5	82	2900	5050	47
80	NB.CRBT805	80	91	5	0.15	82.5	87	3050	5430	50
85	NB.CRBT855	85	96	5	0.15	87.5	92	3110	5700	53
90	NB.CRBT905	90	101	5	0.15	92.5	97	3190	6030	56
95	NB.CRBT955	95	106	5	0.15	97.5	102	3220	6310	59
100	NB.CRBT1005	100	111	5	0.15	102.5	107	3370	6630	61

Description

Design Principles: The 90° orthogonal crossed arrangement of rollers forms symmetrical "X"-shaped contact lines, evenly distributing radial, axial, and moment loads, avoiding local stress concentration, and adapting to the composite load requirements of compact equipment. The integral ultra-thin design of inner and outer rings reduces assembly steps and cumulative errors, enhances system rigidity and rotational accuracy, and maximizes the compression of installation space. Performance Features: Extremely Ultra-thin: Minimum cross-section height of only 6 mm, breaking space limitations and adapting to the compact layout of micro devices. High Precision and Rigidity: P2-class precision meets micron-level positioning requirements, and the crossed roller layout enhances deformation resistance by more than 2.5 times. Low-noise Operation: Precision polishing of roller end faces (Ra≤0.1μm) + low-friction cage design, operating noise ≤45 dB, suitable for noise-sensitive scenarios. Long Service Life and Stability: Surface hardening treatment of GCr15 material increases fatigue life by 30%, ensuring long-term reliable operation of precision equipment. Customization Options: Supports non-standard ultra-thin size customization, hybrid design with ceramic rollers, corrosion-resistant material (SUS440C), special low-noise lubrication solutions, and vacuum/high-temperature adaptive versions.

Features

Core Advantage of Ultra-thin Compactness

Minimum 6 mm cross-section height, significantly saving installation space, perfectly adapting to space-constrained scenarios such as collaborative robots and micro devices.

High Precision and Low Noise

P2-class micron-level positioning accuracy + ≤45 dB low-noise operation, meeting the stringent requirements of precision equipment and service robots.

Convenient and Efficient Installation

Integral inner and outer ring structure, no complex assembly, compatible with standard interference fits, shortening the installation cycle and reducing labor costs.

Composite Load Bearing

A single bearing simultaneously bears radial, axial, and moment loads, simplifying the structural design of micro devices and improving system integration efficiency.

Cost-effective Import Substitute

Independently researched, developed and manufactured in China, technical indicators are aligned with world-class brands, with stable supply and procurement costs 30%-50% lower than imported products.

Working Principle

Working Principle Roller Arrangement and Load Distribution: The rollers are arranged in a 90° orthogonal cross pattern, forming an "X" shaped contact line, which evenly distributes radial, axial, and moment loads to each roller, preventing localized stress overload. In this compact structure, the symmetrical distribution of contact lines ensures balanced load transfer and improves operational stability. Moment loads are efficiently transmitted through the diagonal rollers, further enhancing load-bearing capacity. Lubrication and Sealing: Sealing Protection: Double-contact seals (UU/U) effectively prevent dust and liquid ingress, suitable for complex industrial environments; the open design reduces operating resistance and meets the requirements of clean and low-noise applications. Thermal Management: Precision polishing of the roller end faces and a low-friction cage design effectively control the operating temperature rise (typical temperature rise ≤14°C), and combined with the heat dissipation characteristics of the ultra-thin structure, ensure thermal stability of precision equipment in compact spaces. Installation Adaptability: The integrated ultra-thin structure of the inner and outer rings simplifies the installation process, eliminating the need for additional positioning components; it is compatible with standard interference fits (shaft h6/bore H7), meeting the assembly tolerance requirements of most miniature equipment and robots, and can be directly bolted or nested for installation.

Application & Case

1. Industrial & Collaborative Robots

Robot arm joints (wrist, elbow, shoulder)

Harmonic drive support bearings

Compact rotary actuators

CRBT bearings provide high moment stiffness and smooth rotation in a very slim profile, ideal for robotic joints.

2. Precision Positioning Systems

High-accuracy rotary stages

Indexing units

6.Aerospace & Defense Systems

UAV camera stabilizers

Satellite antenna gimbals

Inertial navigation platforms

CRBT bearings offer lightweight construction with excellent resistance to combined loads.

7. Automation & Inspection Equipment

Vision-inspection rotaries

Pick-and-place positioning units

Precision assembly machines

The thin structure helps reduce overall machine size while maintaining stiffness.

8. Compact Turntables & Slewing Units

Small slewing mechanisms

Pan-tilt units

Compact indexing tables

CRBT bearings provide slewing-type performance in a much smaller footprint.

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FAQ

What is the core difference between CRBT type and CRBH type crossed roller bearings?

CRBT takes "ultra-thin cross-section" as its core advantage, with a minimum cross-section of only 6 mm, focusing on space-constrained scenarios; CRBH is a conventional ultra-thin design (minimum 8 mm), focusing on general compact requirements. The selection depends on the equipment space margin and load requirements.

Which scenarios are the low-noise characteristics of CRBT type bearings suitable for?

It is suitable for noise-sensitive scenarios such as collaborative robots, medical service robots, and laboratory precision instruments. The noise is ≤45 dB under normal speed, which can meet the silent operation requirements.

What is the delivery time for non-standard ultra-thin sizes?

Usually 6-10 weeks. Specifically, it needs to be determined according to the processing difficulty of ultra-thin sizes, material supply and production schedule. Urgent production services are supported.

How to select the model for corrosive environments?

Bearings made of SUS440C stainless steel should be selected, matched with special corrosion-resistant grease and UU/U sealing type, to improve the service life and stability of the bearing in humid and corrosive medium environments.

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Precision Bearings

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