Precision Crossed Roller Bearings

BRU(CRBF) Series Crossed Roller Bearings

The BRU (CRBF) Series features an integrated inner and outer ring design with pre-drilled mounting holes, eliminating the need for additional housing or support flanges and simplifying installation. This structure minimizes the impact on internal bearing performance, ensuring stable rotation accuracy and consistent torque. The crosswise-arranged rollers in a V-shaped groove enable the bearing to support radial, axial, and moment loads simultaneously with high rigidity. Suitable for both inner- and outer-ring rotation, the series offers micron-level precision in a compact design. Widely used in industrial robots, precision turntables, medical instruments, and automation equipment, the BRU series is an ideal solution for high-precision transmission and system miniaturization. Interchangeable with mainstream RU type crossed roller bearings for industrial robots, rotary tables and precision automation systems.

Equivalent: Compatible with RU Series Crossed Roller Bearings

Inner Ring Diameter(shaft diameter)：10mm——350mm

Precision Class: P5/P4/P2

Basic Load Rating(radial): 2.9kN——222kN

Delivery time: In Stock

What is BRU (CRBF) Series Crossed Roller Bearing?

The BRU (CRBF) Series Crossed Roller Bearing is a high-precision, compact bearing solution designed for advanced rotary motion. It features an integrated inner and outer ring structure with cylindrical rollers arranged crosswise at 90° angles in a V-shaped groove. This sophisticated design allows a single bearing to handle radial, axial, and moment loads simultaneously, replacing more complex and bulky multi-bearing setups.

Features of BRU (CRBF) Series Crossed Roller Bearings

Integrated Construction & Simplified Assembly: The inner and outer rings are manufactured as a single unit, eliminating the need for additional housing or supporting flanges. Equipped with precision pre-drilled mounting holes, the BRU (CRBF) allows for direct attachment to equipment, significantly streamlining the installation process.

Extreme Rigidity with Cross-Roller Design: Featuring a unique 90-degree cross-roller arrangement, this series is engineered to handle complex radial, axial, and moment loads simultaneously. The linear contact of the rollers provides high stiffness and minimal elastic deformation.

Ultra-High Precision (Up to 0.001mm): Manufactured to meet P5, P4, and P2 precision grades, BRU (CRBF) bearings deliver exceptional running accuracy. Our P2/P4 grade products achieve rotational runout precision as fine as 0.001mm.

Performance Stability via Advanced Heat Treatment: We maintain strict control over the heat treatment process, utilizing multiple tempering cycles for comprehensive stress relief. This ensures the integrated structure remains dimensionally stable over time, maintaining consistent torque regardless of installation pressure.

Premium Quality & Global Interchangeability: Produced in strict accordance with international standards, BRU (CRBF) bearings offer strong interchangeability. They serve as reliable, high-performance alternatives to imported brands.

Versatile Dual-Ring Rotation: The symmetric integrated design ensures the bearing performs with the same high level of precision and stability whether the application requires inner-ring rotation or outer-ring rotation.

Applications of BRU (CRBF) Series Crossed Roller Bearings

The versatility of the BRU (CRBF) series makes it the preferred choice for:

Industrial Robotics: Precise joints and swiveling units for robotic arms.

Precision Turntables: CNC rotary tables and indexing heads.

Medical Equipment: High-precision scanning devices and surgical robots.

Aerospace & Automation: Optical measuring instruments and precision positioning systems.

Techspecs of BRU (CRBF) Series Crossed Roller Bearings

Material: High-quality GCr15 (SAE52100) bearing steel for maximum durability.

Loading: Multi-directional loading (Radial, Axial, and Moment).

Precision Ratings: High-precision grades P5, P4, and P2.

Rotation Type: Optimized for both inner-ring and outer-ring rotation.

How does BRU (CRBF) Series Crossed Roller Bearings work?

The working principle is based on the 90° V-groove race where rollers are oriented perpendicularly in an alternating pattern. This configuration increases the contact surface compared to standard ball bearings. As the bearing rotates, these rollers distribute the load across the entire race, ensuring smooth motion and high torque consistency even under complex stress directions.

How to Install BRU (CRBF) Series Crossed Roller Bearings?

Pre-installation Preparation: Thoroughly clean the bearing seat and all associated components. Inspect the bearing seat for any damage or irregularities, as any defect can negatively impact installation accuracy.
The Installation Process: Place the bearing horizontally onto the seat. Use a flat, small wooden block on the surface of the bearing as a buffer. Using a small hammer, gently tap the wooden block in a balanced sequence. Gradually drive the bearing into the seat until it is perfectly flush with the base.
Post-installation Inspection: Check the overall appearance for any damage, test the rotation speed, and listen closely for any unusual noise.

Operational Inspection of BRU (CRBF) Series Crossed Roller Bearings

Manual Inspection (For Small Bearings): Manually rotate the bearing to ensure smooth motion. This helps identify irregularities caused by foreign objects, scratches, or uneven torque resulting from improper installation.

Inertia Inspection (For Large Bearings): Start the equipment without load, then immediately switch off the power. Let the bearing rotate due to inertia to check for vibrations, abnormal noises, or friction.

Power-on Test & Load Gradation: Operate at low speed under no-load conditions, then gradually increase to rated levels. Monitor for unusual noises, abnormal temperature spikes, or lubricant discoloration.

Temperature Monitoring: Typically, temperature stabilizes after 1–2 hours. A rapid or excessive rise may indicate improper installation, over-lubrication, or insufficient clearance.

Rust Prevention Treatment

Correct Paint Selection: Avoid paints containing oxidative components; solvent-free paints are the most suitable.

Immersion Method: Suitable for small bearings by dipping them in anti-rust grease.

Brushing Method: For bearings with complex shapes, apply a moderate, even layer of anti-rust oil manually.

Spray Method: Standard for large-scale bearings using solvent-diluted anti-rust oil. Ensure fire safety measures are followed.

Price of BRU (CRBF) Series Crossed Roller Bearings

The price depends on the dimensions, precision requirements, and order quantity. Because this series integrates multiple components, it reduces the cost of peripheral parts and installation time. For a specific project quotation, please consult with our sales team.

Supplier of BRU (CRBF) Series Crossed Roller Bearings

BYBearings (Luoyang Boying Bearing Co., Ltd) is a leading professional manufacturer specializing in the research, development, and production of high-precision Crossed Roller Bearings and YRT Rotary Table Bearings.

BYBearings is committed to helping our clients achieve system miniaturization and superior mechanical performance through our high-quality, high-stability bearing solutions.

BRU

Shaft Diameter (mm)	Model	Bore Diameter (mm)	Outer Diameter (mm)	Roller Pitch Diameter (mm)	Width (mm)	Chamfer Dimension r (min)	Inner Ring Shoulder Diameter ds (mm)	Outer Ring Shoulder Diameter Dh (mm)	Dynamic Radial Load Rating C (kN)	Static Radial Load Rating Co (kN)	Weight (kg)
10	BRU28	10	52	29	8	0.3	25	32	2.9	2.4	0.12
20	BRU42	20	70	42	12	0.6	37	47	7.35	8.35	0.29
35	BRU66	35	95	66	15	0.6	59	74	17.5	22.3	0.62
55	BRU85	55	120	85	15	0.6	79	93	20.3	29.5	1
80	BRU124(G/X)	80	165	124	22	1	114	134	33.1	50.9	2.6
90	BRU148(G/X)	90	210	147.5	25	1.5	133	162	49.1	76.8	4.9
115	BRU178(G/X)	115	240	178	28	1.5	161	195	80.3	135	6.8
160	BRU228(G/X)	160	295	227.5	35	2	208	246	104	173	11.4
210	BRU297(G/X)	210	380	297.3	40	2.5	272	320	156	281	21.3
350	BRU445(G/X)	350	540	445.4	45	2.5	417	473	222	473	35.4

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.