Precision Crossed Roller Bearings

BX Series Crossed Roller Bearings

The BX Series Crossed Roller Bearing is a high-precision, integral ring bearing featuring cylindrical rollers arranged perpendicularly in a 90° V-shaped raceway. This unique crossed-roller configuration enables a single bearing to simultaneously support radial, axial, and moment loads with exceptional rigidity and rotational accuracy. Designed with un-split inner and outer rings, the BX series offers enhanced structural integrity and simplified installation. It is ideal for demanding applications such as industrial robotics, CNC rotary tables, medical imaging equipment, and precision measuring instruments. Interchangeable with mainstream SX type crossed roller bearings for industrial robots, rotary tables and precision automation systems.

Equivalent: Compatible with SX Series Crossed Roller Bearings

Inner Ring Diameter：70mm——500mm

Precision Class: P5/P4/P2

Basic Load Rating(axial): 15.4kN——560kN

Basic Load Rating(radial):11kN——395 kN

Delivery time: In Stock

What is BX series Crossed Roller Bearings?

The BX series Crossed Roller Bearings represent a sophisticated motion control solution engineered for applications where space is at an absolute premium but performance cannot be compromised. 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.

Unlike traditional bearings that require pair-mounting, a single BX series Crossed Roller Bearings unit functions as a complete rotary system. Developed by BYBearings, this series utilizes advanced manufacturing techniques to ensure that the integrated rings provide a stable, "all-in-one" platform, lowering the risk of assembly errors.

Features of BX series Crossed Roller Bearings

Exceptional Rotational Accuracy: Grinding processes ensure minimal radial and axial runout for sub-micron consistency.

Simplified Integrated Mounting: Features pre-drilled, countersunk mounting holes, eliminating the need for complex press-fit housings.

High Load-Carrying Capacity in a Slim Profile: Linear contact between the rollers and the raceway provides a significantly larger contact area than ball bearings.

Universal Multi-Directional Load Support: Simultaneously handles radial loads, axial loads from both directions, and moment (tilting) loads.

High Rigidity & Low Friction: Optimized internal preload maintains maximum stiffness with minimal frictional torque.

Applications of BX series Crossed Roller Bearings

Industrial Robotics & Cobots: Core components in robotic arm joints where they provide torque density and stability.

Precision Rotary Tables: Enabling smooth rotation for CNC machining centers and laser cutting machines.

Advanced Medical Diagnostic Systems: Ensures silent, vibration-free motion for CT scanners and MRI gantries.

Aerospace & Satellite Communication: Used in gimbal systems and antenna positioning units.

Semiconductor Manufacturing: Essential for wafer handling robots requiring nanometer-level accuracy.

Techspecs of BX series Crossed Roller Bearings

Precision Classes: Available in P5, P4, and ultra-precision P2 grades.

Optimized Internal Clearance: Adjusted during manufacturing to offer zero clearance or precise preload.

Premium Material Science: High-purity, vacuum-degassed GCr15 bearing steel for maximum fatigue resistance.

Sealing & Lubrication: Options for low-torque seals and cleanroom-compatible grease.

How does BX series Crossed Roller Bearings work?

The mechanical efficiency lies in the 90° V-groove geometry. In the BX series Crossed Roller Bearings, the rollers are alternatingly crossed, acting like two rows of bearings compressed into a single track. This configuration allows the bearing to maintain absolute center-point stability even under combined fluctuating forces.

How to Install BX series Crossed Roller Bearings

Pre-Installation Cleaning: Clean mounting surfaces and ensure the shaft/housing are free of burrs.

Precision Alignment: Align mounting holes with the machine interface without excessive force.

Sequential Fastening: Use a torque wrench to tighten bolts in a diagonal "star" pattern in incremental stages.

Operational Testing: Rotate manually to ensure smooth motion without irregular resistance.

Price of BX series Crossed Roller Bearings

The pricing is determined by dimensional scale, accuracy grade (P2 vs. P5), and industrial order volume. BYBearings operates with a tiered pricing model to offer substantial cost-per-unit reductions for large-scale partnerships.

Supplier of BX 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 BX 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 BX 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.

Model	ID (d) mm	OD (D) mm	Roller Pitch Circle Dia. dp (mm)	Width (B) mm	Grease Hole	Chamfer r (min) mm	Shoulder Height (mm)		Axial Load Rating (kN)		Radial Load Rating (kN)		Weight (kg)
Model	ID (d) mm	OD (D) mm	Roller Pitch Circle Dia. dp (mm)	Width (B) mm	Grease Hole	Chamfer r (min) mm	de	Di	Dyn. (Ca)	Stat. (Coa)	Dyn. (Cr)	Stat. (Cor)	Weight (kg)
BX011814	70	90	80	10	1	0.6	79.5	80.5	15.4	51	11	20	0.3
BX011818	90	115	102	13	1.2	1	101.5	102.5	26	91	18	37	0.4
BX011820	100	125	112	13	1.2	1	111.5	112.5	28	102	19	41	0.5
BX011824	120	150	135	16	1.5	1	134.4	135.6	38	146	27	59	0.8
BX011828	140	175	157	18	1.5	1.1	156.3	157.7	64	240	45	96	1.1
BX011832	160	200	180	20	1.5	1.1	179.2	180.8	69	275	49	111	1.7
BX011836	180	225	202	22	2	1.1	201.2	202.8	96	381	69	153	2.3
BX011840	200	250	225	24	2	1.5	224.2	225.8	102	425	72	170	3.1
BX011848	240	300	270	28	2	2	269.2	270.8	148	640	105	255	5.3
BX011860	300	380	340	38	2.5	2.1	339.2	340.8	243	1070	173	425	12
BX011868	340	420	380	38	2.5	2.1	379.2	380.8	260	1220	185	485	13.5
BX011880	400	500	450	46	2.5	2.5	449	451	385	1800	275	720	24
BX0118/500	500	620	560	56	2.5	3	558.8	561.2	560	2750	395	1100	44

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.