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Cross Roller Bearings

CRBC crossed roller bearings

CRBC crossed roller bearings are a type of high-precision bearing (often from brands like IKO) featuring cylindrical rollers arranged perpendicularly (crossed) for high rigidity, compact size, and the ability to handle loads in all directions (radial, axial, moment), making them ideal for industrial robots, machine tool tables, and automation where accuracy and space are critical, with the "CRBC" designation typically meaning a split outer ring for easy mounting and inner ring rotation.

Structural Features:

Inner Ring: Integral structure;

Outer Ring: Split structure (facilitates preload adjustment);

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

Accuracy Classes:

Rotational Accuracy: P5, P4, P2

Size:

Inner Diameter: 30–800 mm;

Outer Diameter: 55–1030 mm;

Cross-section Height: 10–100 mm

Materials:

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

Cages:

Nylon 66 (lightweight), brass (high-strength), or custom composite materials

Sealing Options:

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

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

Delivery/Customization:

Standard models: 7–15 days;

Customized models: Negotiated according to design complexity; OEM cooperation supported

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Techspecs

Cross Roller Bearing CRBC Series
MODEL		SIZES(MM)				MOUNTING		NB.CRBC		NB.CRB		WEIGHT
With cage	Fully rollers	d	D	B	r (min)	DIMENSIONS		Dynamic Load Rating	Static Load Rating	Dynamic Load Rating	Static Load Rating	KG
With cage	Fully rollers	mm	mm	mm	r (min)	(mm)		C(KN)	Co(KN)	C(KN)	Co(KN)	KG
NB.CRBC3010	NB.CRB3010	30	55	10	0.3	34	44	3.8	4.1	5.29	6.35	0.12
NB.CRBC4010	NB.CRB4010	40	65	10	0.3	44	54	4.28	5.14	5.98	8.04	0.15
NB.CRBC5013	NB.CRB5013	50	80	13	0.6	55	71	10.7	12.6	14.2	18.4	0.29
NB.CRBC6013	NB.CRB6013	60	90	13	0.6	64	81	11.6	14.6	15.4	21.5	0.33
NB.CRBC7013	NB.CRB7013	70	100	13	0.6	75	91	12.3	16.7	17	25.5	0.38
NB.CRBC8016	NB.CRB8016	80	120	16	0.6	86	107	18.2	25.5	24.3	37.5	0.74
NB.CRBC9016	NB.CRB9016	90	130	16	1	98	118	19.4	28.6	25.9	42.1	0.81
NB.CRBC10020	NB.CRB10020	100	150	20	1	108	134	31.5	45.1	39.4	61.1	1.45
NB.CRBC11020	NB.CRB11020	110	160	20	1	118	144	33.5	50.7	41.2	66.7	1.56
NB.CRBC12025	NB.CRB12025	120	180	25	1.5	132	164	47.7	70.5	59.9	95.4	2.62
NB.CRBC13025	NB.CRB13025	130	190	25	1.5	140	172	49.2	74.8	61	99.8	2.82
NB.CRBC14025	NB.CRB14025	140	200	25	1.5	151	183	50.7	79.2	64.1	108	2.96
NB.CRBC15025	NB.CRB15025	150	210	25	1.5	160	192	53.8	87.7	65	113	3.16
NB.CRBC15030	NB.CRB15030	150	230	30	1.5	166	202	69.2	108	85.9	144	5.3
NB.CRBC20025	NB.CRB20025	200	260	25	2	208	239	60.2	110	75.3	148	4
NB.CRBC20030	NB.CRB20030	200	280	30	2	218	262	108	178	133	234	6.7
NB.CRBC20035	NB.CRB20035	200	295	35	2	221	274	137	215	168	282	9.58
NB.CRBC25025	NB.CRB25025	250	310	25	2.5	259	290	67.2	136	83.9	183	4.97
NB.CRBC25030	NB.CRB25030	250	330	30	2.5	265	310	116	208	146	283	8.1
NB.CRBC25040	NB.CRB25040	250	355	40	2.5	271	330	179	299	215	382	14.8
NB.CRBC30025	NB.CRB30025	300	360	25	2.5	310	341	73.8	162	91.9	217	5.88
NB.CRBC30035	NB.CRB30035	300	395	35	2.5	318	372	163	299	205	408	13.4
NB.CRBC30040	NB.CRB30040	300	405	40	2.5	321	381	194	351	235	451	17.2
NB.CRBC40035	NB.CRB40035	400	480	35	2.5	414	457	133	300	165	400	14.5
NB.CRBC40040	NB.CRB40040	400	510	40	2.5	423	483	222	455	270	590	23.5
NB.CRBC40070	NB.CRB40070	400	580	70	2.5	430	532	470	811	576	1060	72.4
NB.CRBC50040	NB.CRB50040	500	600	40	2.5	517	573	211	497	259	648	26
NB.CRBC50050	NB.CRB50050	500	625	50	2.5	531	592	247	561	306	747	41.7
NB.CRBC50070	NB.CRB50070	500	680	70	2.5	530	633	536	1020	653	1330	86.1
NB.CRBC60040	NB.CRB60040	600	700	40	3	621	676	231	581	287	774	30.6
NB.CRBC60070	NB.CRB60070	600	780	70	3	630	734	591	1230	700	1540	102
NB.CRBC600120	NB.CRB600120	600	870	120	3	643	817	1250	2210	1490	2800	274
NB.CRBC70045	NB.CRB70045	700	815	45	3	730	785	250	681	301	917	46.5
NB.CRBC70070	NB.CRB70070	700	880	70	3	731	834	630	1390	766	1810	115
NB.CRBC700150	NB.CRB700150	700	1020	150	3	751	953	1660	3010	1980	3820	478
NB.CRBC80070	NB.CRB80070	800	950	70	4	831	907	417	1090	513	1440	109
NB.CRBC800100	NB.CRB800100	800	1030	100	4	840	972	936	2040	1140	2640	247

Description

Design Principles: The 90° orthogonal crossed arrangement of rollers forms a symmetrical contact line, evenly distributing radial, axial and moment loads and reducing local stress concentration. The split outer ring design allows precise preload adjustment via shims, while the integral inner ring structure ensures high rigidity and rotational accuracy, reducing cumulative assembly errors. Performance Features: Thin-section and Compact: Minimum cross-section height of 7mm, suitable for precision equipment with limited space. High Rigidity: The crossed roller layout enhances deformation resistance by more than 3 times, meeting the requirements of high-torque working conditions. Precision Adjustable: The split outer ring facilitates preload adjustment, adapting to different precision and load requirements. Import Substitute: All technical indicators meet world-class standards, which can directly replace similar products of brands such as IKO. Customization Options: Supports non-standard size customization, hybrid design with ceramic rollers, corrosion-resistant material (SUS440C), and special lubrication solutions for vacuum/high-temperature environments.

Features

Composite Load Bearing Capacity

A single bearing simultaneously bears radial, axial, and moment loads, simplifying equipment structural design.

High Rigidity and Precision

P2-class precision meets micron-level positioning requirements, and high rigidity ensures stability during cutting, machining, and other working conditions.

Easy Installation and Adjustment

The split outer ring design facilitates preload adjustment and maintenance, making it suitable for complex assembly scenarios.

Excellent Space Adaptability

The thin-walled structure significantly saves installation space, adapting to the compact layout requirements of robots, micro-devices, and other equipment.

High Cost-Effectiveness

Independently researched, developed, and manufactured in China, it replaces imported products, reduces procurement costs, and ensures a stable supply.

Working Principle

Roller Arrangement and Load Distribution: The 90° orthogonal cross arrangement of rollers forms "X"-shaped contact lines, which evenly distributes radial, axial, and moment loads to each roller, avoiding local stress overload. Moment loads are transmitted through diagonal rollers, further improving load-bearing efficiency and structural stability. Lubrication and Sealing: Sealing Protection: Double contact seals (UU/U) effectively block dust and liquid intrusion, adapting to complex industrial environments; the open-type design meets the long-term operation requirements of clean environments. Thermal Management: Precision polishing of roller end faces (Ra≤0.1μm) and low-friction design control operating temperature rise (typical temperature rise ≤12°C), ensuring the thermal stability of precision equipment. Installation Compatibility: The split outer ring structure simplifies installation and preloading processes, allowing precise control of preload force by adding or removing adjustment shims. It is compatible with standard interference fits (shaft h6/housing bore H7) and meets the assembly tolerance requirements of most industrial equipment.

Application & Case

1. Industrial Robots & Collaborative Robots (Cobots)

Robot arm joints

Wrist units

End-effectors requiring precise rotation
CRBC bearings provide high rigidity, minimal rotational error, and strong moment load capacity—ideal for robotic motion.

2. Precision Rotary Tables

CNC indexing tables

Rotary positioning platforms

Laser cutting and inspection rotaries
Crossed rollers give high axial and radial stiffness, essential for accurate angular positioning.

3. Medical Equipment

CT scanner rotary parts

MRI positioning systems

Surgical robots
The quiet, smooth, high-precision rotation is suitable for sensitive medical devices.

4. Semiconductor Manufacturing Equipment

Wafer handling arms

Lithography stages

Inspection/measurement stages
CRBC bearings deliver extremely stable, low-friction rotation, crucial for semiconductor precision.

5. Optical & Photonics Instruments

Telescope mounts

Camera gimbals

Beam-steering platforms
Their ultra-low rotational error ensures stability in optical alignment.

6. Aerospace & Defense Equipment

Satellite antenna gimbals

Radar rotation units

UAV cameras & stabilizers
Lightweight and high-rigidity performance is ideal for mission-critical systems.

7. Machine Tool Equipment

Tool changers

Measuring heads

Small precision spindles
Stable rotation improves machining repeatability.

8. Automation Systems

Pick-and-place machines

Precision indexing arms

Automated inspection devices
They handle both multi-direction loads and repetitive high-speed cycles.

9. Measuring & Metrology Systems

CMM (coordinate measuring machines) rotate axes

Laser measurement tools

High-accuracy encoder systems
The smooth, backlash-free rotation is essential for sub-micron precision measurements.

10. Small Slewing & Turntable Mechanisms

Compact industrial turntables

Light-load slewing rings

Pan-tilt mechanisms

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FAQ

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

The CRBC type features a split outer ring design for easy preload adjustment; the CRBH type adopts an integral inner and outer ring design, suitable for more compact spaces. Both can bear composite loads, and the selection depends on the installation adjustment requirements and space conditions.

Does the CRBC type bearing support replacement of imported brands?

Yes, the product's precision, rigidity and service life all meet world-class standards, which can directly replace imported series such as IKO CRB, with shorter delivery cycle and higher cost performance.

What is the delivery time for non-standard sizes?

Usually 6-10 weeks. Specifically, it needs to be determined according to the design complexity, material supply and production schedule, and urgent production services are supported.

How to select the model for humid or corrosive environments?

It is necessary to select bearings made of SUS440C stainless steel, matched with special corrosion-resistant grease, and choose the UU/U sealing type to improve protection performance and service life.

CNC Machinery

Precision Bearings

Non-standard Machinery Parts

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