Precision Crossed Roller Bearings

BSU Series Crossed Roller Bearings

BSU series Crossed Roller Bearings are high-precision, integrated rotary systems designed for heavy-duty applications that demand extreme rigidity and space-saving efficiency. Featuring a unique orthogonal roller arrangement within a single raceway, this series effectively replaces complex multi-bearing setups to handle axial, radial, and moment loads simultaneously. These robust bearings provide a stable, high-torque platform for large-scale industrial robotics, precision rotary tables, medical imaging equipment, and radar pedestals, ensuring sub-micron accuracy in the most demanding motion control environments. Interchangeable with mainstream XSU type crossed roller bearings for industrial robots, rotary tables and precision automation systems.

Equivalent: Compatible with XSU Series Crossed Roller Bearings

Inner Ring Diameter(shaft diameter)：130mm——1024mm

Precision Class: P5/P4/P2

Basic Load Rating(axial): 66kN——390kN

Basic Load Rating(radial):42kN——246 kN

Delivery time: In Stock

What is BSU series Crossed Roller Bearings?

The BSU series Crossed Roller Bearings represent a sophisticated motion control solution engineered for large-scale applications where heavy-duty performance and extreme precision must coexist. This series is characterized by its unique internal geometry: cylindrical rollers are arranged orthogonally—crossing each other at 90° angles—within a single, precision-ground V-groove raceway.

Engineered by BYBearings, the BSU series Crossed Roller Bearings are specifically designed for larger shaft diameters, ranging from 130mm to 1024mm. Unlike traditional bearing arrangements that require multiple components to handle complex forces, a single BSU series Crossed Roller Bearings unit functions as a complete, integrated rotary system. This design significantly reduces the mechanical footprint while providing a stable, high-torque platform for heavy machinery.

Features of BSU series Crossed Roller Bearings

BYBearings manufactures the BSU series Crossed Roller Bearings with meticulous attention to detail, ensuring the following industry-leading advantages:

Massive Load-Carrying Capacity: Designed for heavy-duty industrial use, the BSU series Crossed Roller Bearings offer basic axial load ratings from 66kN to 390kN and radial load ratings from 42kN to 246kN.

Exceptional Rotational Accuracy: Despite their large scale, these bearings maintain ultra-high precision, with manufacturing standards reaching P5, P4, and P2 grades to ensure minimal runout.

Integrated Mounting Infrastructure: The BSU series Crossed Roller Bearings feature integrated mounting holes on both the inner and outer rings. This allows for direct bolting to the mounting surface, eliminating the need for complex clamping plates or specialized housings.

High Rigidity & Center-Point Stability: The orthogonal roller arrangement provides linear contact with the raceway, ensuring that the BSU series Crossed Roller Bearings remain rigid even under intense moment (tilting) loads.

Space-Efficient Integrated Design: By combining axial and radial support into a single unit, the BSU series Crossed Roller Bearings simplify the overall structure of large-scale rotary systems.

Applications of BSU series Crossed Roller Bearings

Because of their high precision, high load handling, and large-diameter capabilities, BSU series Crossed Roller Bearings from BYBearings are widely used in:

Large-Scale Industrial Robotics: Providing the structural foundation for heavy-payload robotic bases and primary rotation joints.

Precision Rotary Tables: Enabling smooth, high-torque rotation for large-scale CNC vertical lathes, boring mills, and heavy indexing tables.

Large Medical Imaging Equipment: Used in the main gantries of advanced CT and MRI scanners where silent, ultra-precise motion is required.

Radar & Satellite Pedestals: Providing stable support for large-diameter antenna systems that must maintain accuracy under wind and gravitational loads.

Heavy Construction Machinery: Integrated into precision joints for cranes and tunneling equipment where BSU series Crossed Roller Bearings ensure long-term reliability.

Techspecs of BSU series Crossed Roller Bearings

The BSU series Crossed Roller Bearings from BYBearings are built to the following technical standards:

Shaft Diameter (d): Accommodating large shafts from 130mm up to 1024mm.

Precision Classes: Available in P5, P4, and ultra-precision P2 grades for various industrial tolerances.

Load Performance: Axial load ratings of 66kN–390kN; Radial load ratings of 42kN–246kN.

Material Excellence: Crafted from high-purity GCr15 bearing steel or specialized alloys to ensure maximum wear resistance and fatigue life.

Availability: Most standard BSU series Crossed Roller Bearings models are In Stock, ensuring rapid delivery for critical projects.

How does BSU series Crossed Roller Bearings work?

The mechanical efficiency of the BSU series Crossed Roller Bearings lies in the 90° V-groove geometry. In the BSU series Crossed Roller Bearings, the rollers are alternatingly crossed, effectively acting like two rows of bearings compressed into a single track. When a massive axial force pushes from the top, half of the rollers take the load; when a radial force or a moment load tries to tilt the axis, the other half stabilize the system. This unique configuration allows large-diameter BSU series Crossed Roller Bearings to maintain absolute stability even under complex, combined forces.

How to Install BSU series Crossed Roller Bearings

Proper installation is the key to unlocking the full potential of BYBearings' precision design. Follow these professional steps:

Pre-Installation Cleaning: Thoroughly clean the mounting surfaces. Ensure the shaft and housing are free of burrs or surface irregularities.

Precision Alignment: Carefully align the pre-drilled mounting holes of the BSU series Crossed Roller Bearings with the machine interface.

Sequential Fastening: Insert high-strength mounting bolts. Using a calibrated torque wrench, tighten the bolts in a diagonal "star" pattern in 3-4 incremental stages.

Operational Testing: After installation, rotate the assembly manually. The BSU series Crossed Roller Bearings should rotate smoothly with consistent torque across the entire diameter.

Price of BSU series Crossed Roller Bearings

The pricing structure for the BSU series Crossed Roller Bearings is determined by the specific requirements of your project:

Dimensional Scale: As the bore diameter approaches 1024mm, material and grinding costs increase significantly.

Accuracy Grade Requirements: High-precision P2 models involve more intensive quality validation.

Industrial Order Volume: BYBearings provides substantial cost-per-unit reductions for large-scale industrial orders and wholesale partnerships.

In-Stock Advantage: Standard BSU series Crossed Roller Bearings models are ready for shipment, offering the best market value for rapid deployment.

Supplier of BSU series Crossed Roller Bearings

BYBearings is a nationally recognized High-Tech Enterprise dedicated to the integrated design, development, manufacturing, and global sales of high-precision bearings. As an industry leader, we maintain a state-of-the-art production facility where every BSU series Crossed Roller Bearings unit is crafted using advanced proprietary technologies and rigorous quality control protocols. By managing the entire lifecycle from initial R&D to final distribution, BYBearings ensures that our BSU series Crossed Roller Bearings deliver unmatched reliability and performance. Our commitment to innovation and excellence makes us the trusted partner for clients worldwide seeking cost-effective, world-class precision motion solutions with minimal lead times.

Shaft Dia. (mm)	Model	ID (d) mm	OD (D) mm	Width (B) mm	Mounting Holes (nB)	Chamfer r (min) mm	ø La (mm)	□ Li (mm)	Axial Load Rating (kN)		Radial Load Rating (kN)		Limiting Speed (r/min)	Weight (kg)
Shaft Dia. (mm)	Model	ID (d) mm	OD (D) mm	Width (B) mm	Mounting Holes (nB)	Chamfer r (min) mm	ø La (mm)	□ Li (mm)	Dyn. (Ca)	Stat. (Coa)	Dyn. (Cr)	Stat. (Cor)	Limiting Speed (r/min)	Weight (kg)
130	BSU080168	130	205	25	12	1.1	190	145	66	240	42	96	227	3.3
150	BSU080188	150	225	25.4	16	1.1	210	165	71	275	46	110	203	3.7
180	BSU080218	180	255	25.4	20	1.1	240	195	77	315	49	127	175	4.3
220	BSU080258	220	295	25.4	24	1.5	280	235	84	375	54	151	148	5.1
280	BSU080318	280	355	25.4	28	1.5	340	295	93	465	59	185	120	6.3
360	BSU080398	360	435	25.4	36	2	420	375	106	590	68	236	96	7.8
344	BSU140414	344	484	56	24	2	460	368	220	520	146	225	-	28
474	BSU140544	474	614	56	32	2.5	590	498	270	680	170	330	-	38
574	BSU140644	574	714	56	36	2.5	690	598	260	830	183	405	-	44
674	BSU140744	674	814	56	40	3	790	698	315	930	200	455	-	52
774	BSU140844	774	914	56	40	3	890	798	340	1050	215	510	-	60
874	BSU140944	874	1014	56	44	3	990	898	360	1170	227	580	-	67
1024	BSU141094	1024	1164	56	48	4	1140	1048	390	1360	246	670	-	77

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.