Precision Crossed Roller Bearings

BRB Series Crossed Roller Bearings

BRB series crossed roller bearings are precision units featuring a separable outer ring and an integrated inner ring. This specialized structure optimizes the bearing for high inner-ring rotation accuracy. Utilizing a compact 90-degree cross-roller arrangement, they handle combined radial, axial, and moment loads with exceptional rigidity and P2/P4 precision grades. These slim, zero-play solutions are essential for high-performance applications like industrial robot joints, CNC rotary tables, and medical devices, where space-saving design and micrometer-level stability are critical. Interchangeable with mainstream RB type crossed roller bearings for industrial robots, rotary tables and precision automation systems.

Equivalent: Compatible with RB Series Crossed Roller Bearings

Inner Ring Diameter(shaft diameter)：36mm——1500mm

Precision Class: P5/P4/P2

Basic Load Rating(radial): 3.23kN——1350kN

Delivery time: In Stock

What is the BRB Series Crossed Roller Bearing?

The BRB Series Crossed Roller Bearing is a high-precision, compact bearing solution where cylindrical rollers are arranged at 90° angles to each other in a V-groove raceway. Produced by specialized manufacturers like BYBearings, this series typically features an integrated inner ring and a split outer ring, allowing it to handle complex radial, axial, and moment loads simultaneously within a single unit.

Features of BRB Series Crossed Roller Bearings

High Rotational Accuracy: The integrated inner ring design makes it ideal for applications requiring high precision during inner ring rotation.

Superior Rigidity: The linear contact of the rollers provides significantly more stiffness and less deformation under load compared to ball bearings.

Space Efficiency: A single BRB bearing can replace a complex set of multiple bearings, reducing the overall footprint of the machine joint or table.

Preload Customization: The split outer ring allows for the precise adjustment of internal clearance or the application of a preload to eliminate mechanical play.

Applications of BRB Series Crossed Roller Bearings

Robotics: Main pivot joints and swiveling units for industrial robot arms.

Machine Tools: CNC rotary tables, precision indexing heads, and vertical lathes.

Medical Equipment: Rotating components in CT scanners, X-ray machines, and surgical robots.

Precision Instruments: Semiconductor manufacturing equipment, optical telescopes, and laboratory measuring devices.

Techspecs of BRB Series Crossed Roller Bearings

Precision Class: Available in P5, P4, and P2 grades.

Materials: High-carbon chromium-bearing steel (GCr15/100Cr6) for high wear resistance.

Configurations: Available in various bore diameters (commonly 20mm to 1200mm+) and widths.

Separators: Equipped with nylon spacers or cages to prevent roller-to-roller friction and ensure smooth high-speed rotation.

How do BRB Series Crossed Roller Bearings work?

The bearing works by alternating the orientation of cylindrical rollers at a 90-degree cross-pattern. Because the rollers are arranged in this way, one row of rollers handles thrust (axial) loads and radial loads from one direction, while the alternating rollers handle them from the opposite direction. This "crossed" geometry creates a very stable mechanical center that resists tilting moments (tilting loads) extremely effectively.

How to Install BRB Series Crossed Roller Bearings?

1. Pre-installation Preparation

Quality Inspection: Thoroughly inspect all components for defects and ensure the mounting surfaces are free of burrs or damage. For unmachined casting surfaces, ensure all molding sand and impurities are completely removed.

Cleaning: Clean the bearing and related components with kerosene or gasoline. Ensure all parts are fully dry before proceeding to lubrication.

Lubrication: Apply high-quality lubricant to the components. Do not proceed until the parts are properly cleaned, dried, and lubricated.

2. During Installation

Avoid Impact: Crossed roller bearings are high-precision components. Never strike the bearing directly with a hammer or hard tool.

Uniform Pressure: Use a mounting sleeve or specialized tool to apply uniform pressure across the entire circumference of the ring face to press the bearing into the housing.

Precision Alignment: Carefully maintain the fit accuracy between the bearing, the shaft, and the housing. Ensure the bearing is perfectly seated and axially aligned to prevent tilting or internal stress.

Bolt Tightening (Crucial): Tighten the mounting bolts in a "star" or "diagonal" pattern in 3 to 4 stages. Use a calibrated torque wrench for the final stage to ensure consistent clamping force across all bolts.

3. Post-installation Testing

Manual Inspection: After installation, manually rotate the shaft or bearing housing to check for any resistance, catching, or unusual friction.

No-load Run-in: If manual rotation is smooth, perform a power-on test at low speed and zero load. Gradually increase the rotational speed and apply load while monitoring for:

Abnormal noise or vibration.

Excessive temperature rise.

Troubleshooting: If any abnormality is detected, stop the operation immediately. Inspect the assembly, check the bolt torque, and resolve the issue before restarting.

Final Commissioning: The bearing system is only ready for formal operation after successfully passing the trial run.

Pro-Tips for BRB Bearings:

Check Tolerances: Always verify that the shaft and housing tolerances match the manufacturer's specifications (e.g., g6 or h7) to avoid excessive internal preload.

Alignment Marks: Look for "V" markings or accuracy marks on the inner and outer rings; align these according to the technical drawing to achieve maximum rotational precision.

Price of BRB Series Crossed Roller Bearings

Prices are typically quote-based and depend on the size (bore diameter) and precision grade (P5 vs P2). Standard industrial sizes generally range from $100 to $1,500 USD. Bulk orders or custom dimensions for specialized machinery will affect the final unit price.

Supplier of BRB Series Crossed Roller Bearings

BYBearings (Luoyang Boying Bearing Co., Ltd) is a professional manufacturer specializing in the research, development, and production of high-precision crossed roller bearings and YRT rotary table bearings.

BRB

Shaft Diameter (mm)	Model Number	Main Dimensions (mm)					Shoulder Height (mm)		Basic Load Rating (kN)		Weight (kg)
Shaft Diameter (mm)	Model Number	d	D	dp	B/B1	r(min)	ds	Dh	C	Co	Weight (kg)
20	BRB2008	20	36	27	8	0.5	23.5	30.5	3.23	3.1	0.04
25	BRB2508	25	41	32	8	0.5	28.5	35.5	3.63	3.83	0.05
30	BRB3010	30	55	41.2	10	0.6	37	47	7.35	8.36	0.12
35	BRB3510	35	60	46.5	10	0.6	41	51.5	7.64	9.12	0.13
40	BRB4010	40	65	51.2	10	0.6	47.5	57.5	8.33	10.6	0.16
45	BRB4510	45	70	56.5	10	0.6	51	61.5	8.62	11.3	0.17
50	BRB5013	50	80	64	13	0.6	57.4	72	16.7	20.9	0.27
60	BRB6013	60	90	74	13	0.6	68	82	18	24.3	0.3
70	BRB7013	70	100	84	13	1	78	92	19.4	27.7	0.35
80	BRB8013	80	110	93	13	0.6	87	104	20.5	30.2	0.58
80	BRB8016	80	120	96.6	16	1	91	111	30.1	42.1	0.7
90	BRB9016	90	130	107	16	1.5	98	118	31.4	45.3	0.75
100	BRB10016	100	140	117	16	1.5	109	129	31.7	48.6	0.83
100	BRB10020	100	150	122	20	1.5	113	133	33.1	50.9	1.45
110	BRB11012	110	135	122.2	12	1	117	127	12.5	24.1	0.4
110	BRB11015	110	145	126.5	15	1	119	136	23.7	41.5	0.75
110	BRB11020	110	160	130.5	20	1.5	120	143	34	54	1.56
120	BRB12016	120	150	132.6	16	1.5	127	141	24.2	43.2	0.72
120	BRB12025	120	180	148.3	25	1	133	164	66.9	100	2.62
130	BRB13015	130	160	142.8	15	2	137	152	25	46.7	0.72
130	BRB13025	130	190	158	25	1	143	174	69.5	107	2.82
140	BRB14016	140	175	154.8	16	2	147	162	25.9	50.1	1
140	BRB14025	140	200	168	25	1.5	154	185	74.8	121	2.96
150	BRB15013	150	180	163.3	13	2	157	172	27	53.5	0.68
150	BRB15025	150	210	178	25	1	164	194	76.8	128	3.16
150	BRB15030	150	230	187.5	30	2	173	211	100	156	5.3
160	BRB16025	160	220	188	25	2	173	204	81.7	135	3.14
170	BRB17020	170	220	191	20	2	184	198	29	62.1	2.21
180	BRB18025	180	240	208	25	2	195	225	84	143	3.44
190	BRB19025	190	240	211.9	25	2	202	222	41.7	82.9	2.99
200	BRB20025	200	260	228	25	2.5	215	245	84.2	157	4
200	BRB20030	200	280	237.5	30	2.5	221	258	114	200	6.7
200	BRB20035	200	295	247.7	35	2.5	225	270	151	252	9.6
220	BRB22025	220	280	248	25	2.5	235	265	92.3	171	4.1
240	BRB24025	240	300	269	25	3	256	281	68.3	145	4.5
250	BRB25025	250	310	277.5	25	3	265	290	69.3	150	5
250	BRB25030	250	330	287.5	30	3	269	306	126	244	8.1
250	BRB25040	250	355	301.6	40	3	275	326	195	348	14.8
300	BRB30025	300	360	330	25	1.5	315	340	76.3	178	5.9
300	BRB30035	300	395	347.7	35	3	322	368	183	367	13.4
300	BRB30040	300	405	351.6	40	2.5	326	377	212	409	17.2
350	BRB35020	350	400	373	20	3.5	363	383	54.1	143	3.9
400	BRB40035	400	480	437	35	1.5	422	459	156	370	14.5
400	BRB40040	400	510	451	40	1.5	428	479	241	531	23.5
450	BRB45025	450	500	474	25	1.5	464	484	61.7	182	6.6
500	BRB50025	500	550	524.2	25	1.5	514	534	65.5	201	7.3
500	BRB50040	500	600	548.8	40	3.5	526	572	239	607	26
500	BRB50050	500	625	561.6	50	3.5	536	587	267	653	41.7
600	BRB60040	600	700	647	40	4	627	673	264	721	29
700	BRB70045	700	815	753.5	45	4	731	777	281	836	46
800	BRB80070	800	950	868.1	70	5	836	900	468	1330	105
900	BRB90070	900	1050	968.1	70	5	937	1001	494	1490	120
1000	BRB1000110	1000	1250	1115	110	6	1057	1171	1220	3220	360
1250	BRB1250110	1250	1500	1365.8	110	6	1308	1423	1350	3970	440

Production Process

Blueprint · Designing Precision

Given the structural characteristics of crossed roller bearings (rollers arranged in a 90° cross pattern), our technical team uses 3D CAD and finite element analysis (FEA) software to accurately calculate raceway angles, spacing, and interference.

Customizing products based on customer operating conditions, we benchmark against P2/P4/P5 tolerance classes and simulate post-assembly rotational precision in advance. The blueprint serves as the sole standard guiding all subsequent turning, grinding, and inspection processes.

Turning & Grinding · Rough to Mirror

Turning and grinding are the core processes that determine the bearing's geometric precision. We use high-rigidity CNC lathes for step-by-step ring processing, ensuring basic inner/outer diameter and raceway dimensions through rough, semi-finish, and finish turning while leaving grinding allowances.

We employ plunge grinding with formed grinding wheels for the V-shaped raceways of crossed roller bearings, and perform combination matching for the split inner/outer rings to ensure rotational plane runout meets P5 or higher standards.

Assembly · Interlocking Precision

The assembly of crossed roller bearings is more delicate than standard bearings: rollers must be arranged in an alternating cross pattern and precisely guided by spacers or cages.

All components are ultrasonically cleaned, dried, and grouped according to measured dimensions. High rigidity and stable torque are then imparted to the crossed roller bearings through negative clearance or preload adjustments. Assembly is completed in a constant temperature and humidity cleanroom to ensure P4/P2 level precision.

Inspection · Not Missing a Micron

As tolerance classes P5, P4, and P2 become progressively stricter, our inspection equipment and processes are upgraded accordingly:

We use high-precision roundness measuring instruments for dimensional tolerances, dial indicators with dedicated test mandrels for radial and axial runout, profilometers and Coordinate Measuring Machines (CMM) to verify raceway profiles and angles, and dedicated clearance and torque testers to determine clearance and starting torque.

Packaging · Anti-Rust & Protection

The packaging process is equally strict, ensuring zero loss of precision for the crossed roller bearings from the factory until pre-installation.

Eco-friendly anti-rust oil is evenly sprayed to ensure no residual particles in the inner cavity. Each bearing is vacuum-sealed in a thickened PE bag and film for water and dust protection, then boxed using wrapping tape. The outer carton is lined with high-density foam and pearl cotton to prevent transport collisions, and is marked with the model, precision grade (P5/P4/P2), and production batch number.