Precision Crossed Roller Bearings

BBS Series Crossed Roller Bearings

Our BBS series crossed roller bearings are designed for excellence in demanding environments. Featuring superior rigidity and high-precision rotation, the BBS series ensures stable and smooth motion even under complex loading conditions. Its integrated structure provides exceptional durability and simplified installation, making it the preferred choice for high-end manufacturing, medical equipment, and sophisticated robotic joints where performance cannot be compromised. Interchangeable with mainstream CRBS type crossed roller bearings for industrial robots, rotary tables and precision automation systems.

Equivalent: Compatible with CRBS Series Crossed Roller Bearings

Inner Ring Diameter(shaft diameter)：50mm——200mm

Precision Class: P5/P4/P2

Basic Load Rating(radial): 5.1kN——25.8 kN

Delivery time: In Stock

What is BBS Series Crossed Roller Bearing?

The BBS Series is a specialized type of roller bearing where cylindrical rollers are arranged orthogonally—crossing each other at 90° angles—within a single V-groove track.

Unlike traditional ball bearings, the BBS series features integrated inner and outer rings with pre-drilled mounting holes. This "all-in-one" design by BYBearings eliminates the need for press-fit housings or specialized flange plates, significantly simplifying the mechanical structure.

Key Features of BBS Series Crossed Roller Bearings

BYBearings manufactures the BBS series to ensure the following advantages:

High Rotational Accuracy: The integrated structure minimizes mounting errors and ensures stable, ultra-precise rotation.

Multi-Directional Load Support: The 90° cross-array allows a single bearing to handle radial, axial, and moment (tilting) loads simultaneously.

Superior Rigidity: Roller-to-track contact is linear rather than point-based (as in ball bearings), providing much higher stiffness.

Compact & Space-Saving: By combining the functions of two traditional bearings into one, it reduces the overall footprint of the machine joint.

Applications of BBS Series Crossed Roller Bearings

Because of their high precision and compact nature, BBS bearings from BYBearings are widely used in:

Industrial Robots: Specifically in waist, elbow, and wrist joints.

Medical Equipment: High-precision CT scanners and X-ray rotary tables.

CNC Machinery: Precision rotary tables and indexing heads.

Optical & Measurement Devices: Providing stable motion for high-end cameras and sensors.

Techspecs of BBS Series Crossed Roller Bearings

The BBS Series is defined by several critical metrics:

Bore Diameter (d): Ranging from 50mm to over 200mm.

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

Material: High-carbon chromium bearing steel (GCr15) or stainless steel for corrosive environments.

Internal Clearance: Adjusted during manufacturing to offer zero clearance or light preload for maximum rigidity.

How Does BBS Series Crossed Roller Bearing Work?

The magic lies in the 90° V-groove. Because the rollers are alternatingly crossed, they act like two rows of bearings compressed into one track. When an axial force pushes from the top, half the rollers take the load; when a radial force pushes from the side, the other half stabilize the bearing. This unique geometry allows the BBS series to maintain its position even under complex, fluctuating forces.

How to Install BBS Series Crossed Roller Bearings

Installation is simplified thanks to the BYBearings integrated design:

Preparation: Clean the mounting surface and ensure the shaft and housing are free of burrs.

Alignment: Align the pre-drilled mounting holes of the bearing with those of the machine.

Cross-Tightening: Insert the mounting bolts. Use a torque wrench to tighten them in a diagonal "star" pattern to ensure even pressure distribution.

Verification: Gently rotate the bearing by hand to ensure smooth motion before full power-up.

Price of BBS Series Crossed Roller Bearings

The pricing for the BBS series is influenced by several factors:

Size: Larger bore diameters require more material and precision grinding.

Accuracy Class: P2 (ultra-precision) will carry a premium over P5.

Quantity: Wholesale orders significantly reduce the unit cost.

Customization: Specific coatings or material upgrades will affect the final quote.

Supplier of BBS Series Crossed Roller Bearings

BYBearings is a globally recognized supplier and manufacturer of premium crossed roller bearings. We pride ourselves on:

Strict Quality Control: Every BBS bearing undergoes rigorous testing before shipment.

Technical Support: Our engineers assist you in selecting the perfect model for your specific torque and load requirements.

Fast Global Shipping: We maintain a large inventory of standard BBS models to minimize your downtime.

Shaft Dia. (mm)	Model	ID (d) mm	OD (D) mm	Pitch Circle dp (mm)	Width B/B1 (mm)	Chamfer r (min) mm	Shoulder ds (mm)	Shoulder Dh (mm)	Basic Dyn. C (kN)	Basic Stat. C0 (kN)	Weight (kg)	Remarks
50	BBS508	50	66	57	8	0.5	53.5	60.5	5.1	7.19	0.08	BRAU5008
60	BBS608	60	76	67	8	0.5	63.5	70.5	5.68	8.68	0.09	BRAU6008
70	BBS708	70	86	77	8	0.5	73.5	80.5	5.98	9.8	0.1	BRAU7008
80	BBS808	80	96	87	8	0.5	83.5	90.5	6.37	11.3	0.11	BRAU8008
90	BBS908	90	106	97	8	0.5	93.5	100.5	6.76	12.4	0.12	BRAU9008
100	BBS1008	100	116	107	8	0.5	103.5	110.5	7.15	13.9	0.14	BRAU10008
110	BBS1108	110	126	117	8	0.5	113.5	120.5	7.45	15	0.15	BRAU11008
120	BBS1208	120	136	127	8	0.5	123.5	130.5	7.84	16.5	0.17	BRAU12008
130	BBS1308	130	146	137	8	0.5	133.5	140.5	7.94	17.6	0.18	BRAU13008
140	BBS1408	140	156	147	8	0.5	143.5	150.5	8.33	19.1	0.19	BRAU14008
150	BBS1508	150	166	157	8	0.5	153.5	160.5	8.82	20.6	0.2	BRAU15008
160	BBS16013	160	186	170	13	0.5	165	179	23.3	44.9	0.59	BRAU16013
170	BBS17013	170	196	180	13	0.8	175	189	23.5	46.5	0.64	BRAU17013
180	BBS18013	180	206	190	13	0.8	185	199	24.5	49.8	0.68	BRAU18013
190	BBS19013	190	216	200	13	0.8	195	209	24.9	51.5	0.69	BRAU19013
200	BBS20013	200	226	210	13	0.8	205	219	25.8	54.7	0.71	BRAU20013

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.