LYDL BB Series Metric Thin Section Ball Bearings Technical Parameters

Model	Weight (kg)	d (mm)	D (mm)	B (mm)	R	Dynamic Radial Load (kg)	Dynamic Axial Load (kg)	Dynamic Moment Load (N·m)	Standard Diametral Clearance (mm)	Inner Runout (mm)	Outer Runout (mm)	Kaydon Equivalent
LYDL-3010	0.10	30	55	10	1	497	675	78	0.025–0.038	0.010	0.010	BB3010
LYDL-3510	0.11	35	60	10	1	513	709	90	0.030–0.043	0.010	0.010	BB3510
LYDL-4010	0.12	40	65	10	1	553	776	107	0.030–0.043	0.013	0.013	BB4010
LYDL-4510	0.13	45	70	10	1	591	839	125	0.030–0.043	0.013	0.013	BB4510
LYDL-5013	0.24	50	80	13	1	948	1,321	227	0.030–0.056	0.013	0.013	BB5013
LYDL-6013	0.30	60	90	13	1	1,010	1,436	279	0.030–0.056	0.013	0.013	BB6013
LYDL-7013	0.31	70	100	13	1	1,108	1,601	346	0.030–0.056	0.015	0.015	BB7013
LYDL-8016	0.62	80	120	16	1	1,679	2,417	618	0.030–0.056	0.015	0.015	BB8016
LYDL-9016	0.73	90	130	16	1.5	1,773	2,584	718	0.041–0.066	0.015	0.015	BB9016
LYDL-10020	1.21	100	150	20	1.5	2,395	3,480	1,102	0.041–0.066	0.015	0.015	BB10020
LYDL-11015	0.66	110	145	15	1	1,390	2,097	652	0.041–0.066	0.015	0.020	BB11015
LYDL-11020	1.36	110	160	20	1.5	2,524	3,720	1,300	0.041–0.066	0.015	0.020	BB11020
LYDL-12025	2.13	120	180	25	2	3,981	5,745	2,197	0.050–0.080	0.020	0.020	BB12025
LYDL-13025	2.27	130	190	25	2	4,098	5,968	2,412	0.050–0.080	0.025	0.025	BB13025
LYDL-14025	2.50	140	200	25	2	4,359	6,402	2,726	0.050–0.080	0.025	0.025	BB14025
LYDL-15013	0.61	150	180	13	1	1,590	2,455	965	0.050–0.080	0.025	0.025	BB15013
LYDL-15025	2.72	150	210	25	2	4,468	6,614	2,959	0.050–0.080	0.025	0.025	BB15025
LYDL-15030	4.54	150	230	30	2	6,403	9,325	4,475	0.050–0.080	0.025	0.025	BB15030
LYDL-20025	3.40	200	260	25	2.5	5,121	7,820	4,333	0.060–0.090	0.030	0.030	BB20025
LYDL-20030	5.72	200	280	30	2.5	7,288	10,980	6,435	0.060–0.090	0.030	0.030	BB20030
LYDL-20035	8.17	200	295	35	2.5	9,367	13,921	8,529	0.060–0.090	0.030	0.030	BB20035
LYDL-25025	4.09	250	310	25	3	5,718	8,939	5,891	0.070–0.100	0.035	0.035	BB25025
LYDL-25030	7.04	250	330	30	3	8,100	12,519	8,641	0.070–0.100	0.035	0.035	BB25030
LYDL-25040	9.08	250	355	40	3	10,324	15,812	11,489	0.070–0.100	0.035	0.035	BB25040
LYDL-30025	4.99	300	360	25	3	6,163	9,821	7,482	0.070–0.100	0.035	0.035	BB30025
LYDL-30035	11.80	300	395	35	3	11,263	17,595	14,399	0.070–0.100	0.035	0.035	BB30035
LYDL-30040	15.44	300	405	40	3	11,240	17,595	14,576	0.070–0.100	0.035	0.035	BB30040
LYDL-40035	12.03	400	480	35	3.5	12,701	20,518	20,560	0.080–0.110	0.040	0.040	BB40035
LYDL-40040	20.66	400	510	40	3.5	12,888	20,919	21,572	0.080–0.110	0.040	0.040	BB40040
LYDL-50040	22.70	500	600	40	3.5	14,381	23,996	29,099	0.090–0.120	0.045	0.045	BB50040
LYDL-50050	38.05	500	625	50	3.5	14,555	24,367	30,120	0.090–0.120	0.045	0.045	BB50050
LYDL-60040	27.24	600	700	40	4	15,709	26,887	37,565	0.090–0.120	0.045	0.045	BB60040
LYDL-70045	44.95	700	815	45	4	16,887	29,634	47,062	0.090–0.120	0.045	0.045	BB70045
LYDL-80070	98.52	800	950	70	5	26,846	47,799	86,420	0.090–0.120	0.050	0.050	BB80070
LYDL-90070	109.87	900	1050	70	5	28,307	51,478	101,535	0.100–0.130	0.050	0.050	BB90070

Note: Kaydon® part numbers are used for interchange reference only. LYDL BB series metric ball bearings can be used as an alternative solution for some RB series crossed roller bearing applications, depending on load direction, moment load, rigidity, speed, mounting structure, and accuracy requirements. Final selection should be confirmed according to drawings and working conditions.

BB Series Metric Thin Section Ball Bearings

Product Overview

LYDL BB Series Metric Thin Section Ball Bearings are compact metric ball bearings designed for applications requiring smooth rotation, low friction torque, lightweight structure, and space-saving installation. This series can be used as an alternative solution for selected RB series crossed roller bearing applications, especially where the working condition does not require the very high rigidity of crossed roller bearings, but still needs radial load, axial load, and moment load support in a compact bearing structure. Compared with RB crossed roller bearings, BB series metric ball bearings generally provide smoother rotation, lower friction torque, and lighter running performance. They are suitable for applications such as automation equipment, measuring instruments, optical systems, medical equipment, compact rotary tables, light-duty robot joints, inspection systems, and precision mechanical assemblies. However, BB series bearings are not a universal replacement for all RB crossed roller bearings. Final selection should be confirmed according to load direction, moment load, rigidity requirement, rotational accuracy, mounting structure, speed, clearance, and service life requirements. LYDL manufactures BB series metric thin section ball bearings according to customer drawings, samples, application requirements, and interchange references. Custom options are available for dimensions, material, precision grade, clearance, preload, lubrication, packaging, and special working conditions.

Product Brief

1. BB Series Metric Thin Section Ball Bearings are compact metric ball bearings designed as an alternative solution for selected RB series crossed roller bearing applications where smooth rotation, lower friction torque, and space-saving design are required.
2. Sizes: Bore Diameter: 30–900 mm, suitable for compact rotary structures, automation equipment, measuring systems, lightweight rotary tables, robot auxiliary joints, and precision mechanical assemblies.
3. Performance Advantages: Compact metric design; low friction torque; smooth rotation; lower weight; good radial, axial, and moment load capacity; easier rotation compared with high-preload crossed roller bearing arrangements.
4. Material: 52100, SUJ2, 100Cr6, 100CrMn6, GCr15SiMn, GCr15 Bearing Steel.
5. Applications: Automation machinery, rotary tables, measuring equipment, optical instruments, medical equipment, light-duty robot joints, precision turntables, inspection systems, packaging machinery, and compact rotary modules.
6. Accuracy: P0, P6, P5, P4; customized clearance, preload, lubrication, material, precision grade, and special dimensions are available according to drawings and application requirements.

Structural Features

Metric Thin Section Design

BB series bearings adopt a compact metric thin section structure. Compared with standard deep groove ball bearings, they provide a larger bore diameter with a relatively compact cross section, helping engineers reduce installation space and optimize lightweight rotary structures.

Ball Bearing Structure

The rolling elements are precision balls rather than cylindrical rollers. This structure helps reduce friction torque and provides smoother rotation, especially in light to medium load applications.

Radial, Axial, and Moment Load Capability

BB series metric ball bearings can support radial load, axial load, and moment load under suitable operating conditions. This makes them a practical alternative for selected RB crossed roller bearing applications where the load and rigidity requirements are moderate.

Lower Friction Compared with Crossed Roller Bearings

Compared with crossed roller bearings, ball bearing structures usually have lower rolling resistance. This can be useful in equipment requiring smooth rotation, lower starting torque, lower running torque, and easier manual or motor-driven rotation.

Compact Alternative for Selected RB Applications

In some rotary systems, BB series bearings can be considered as an alternative to RB crossed roller bearings when the application does not require extremely high rigidity, high preload, or heavy moment load capacity.

Custom Manufacturing Options

LYDL can customize BB series metric ball bearings according to drawings or application requirements, including dimensions, material, cage type, lubrication, precision grade, clearance, preload, packaging, and marking.

Difference Between BB Series Ball Bearings and RB Crossed Roller Bearings

BB series metric ball bearings and RB series crossed roller bearings can sometimes be used in similar compact rotary structures, but their internal structures and performance priorities are different.

Item	BB Series Metric Ball Bearings	RB Series Crossed Roller Bearings
Rolling Element	Precision balls	Cylindrical rollers arranged crosswise
Main Advantage	Smooth rotation, lower friction torque, compact design	High rigidity, high moment load capacity, high precision support
Load Capacity	Suitable for light to medium combined loads	Better for high radial, axial, and moment loads
Moment Rigidity	Moderate	Higher
Friction Torque	Usually lower	Usually higher, especially with preload
Running Smoothness	Very good for low-torque rotation	Good, but preload may increase torque
Installation Sensitivity	Generally easier	More sensitive to mounting accuracy and preload
Typical Applications	Automation, instruments, light rotary tables, optical devices	Robot joints, precision rotary tables, machine tools, high-rigidity mechanisms
Replacement Suitability	Suitable for selected RB applications with moderate rigidity requirements	Better for high-rigidity and high-load applications

Difference Between BB Series and Other Thin Section Bearing Types

BB series bearings should also be distinguished from standard thin section radial contact, angular contact, and four-point contact bearings.

Bearing Type	Main Characteristics	Recommended Use
BB Series Metric Ball Bearings	Compact metric structure, smooth rotation, radial/axial/moment load capability under suitable conditions	Alternative solution for selected RB applications, compact rotary systems
Radial Contact Thin Section Bearings	Mainly designed for radial loads and low friction rotation	Encoders, measuring instruments, automation equipment
Angular Contact Thin Section Bearings	Supports axial load in one direction, suitable for matched pair arrangements	Precision rotary axes, higher axial stiffness applications
Four-Point Contact Type X Bearings	Supports radial load, bidirectional axial load, and moment load in one bearing position	Compact combined-load rotary systems
RB Crossed Roller Bearings	High rigidity with crossed cylindrical rollers	Robot joints, machine tools, precision rotary tables, high moment load applications

 

Typical Applications

LYDL BB series metric thin section ball bearings are suitable for compact rotary systems requiring smooth rotation, low friction torque, moderate combined load capacity, and space-saving installation. Typical applications include: Automation machinery Lightweight rotary tables Measuring instruments Optical instruments Medical equipment Inspection systems Packaging machinery Compact rotary modules Light-duty robot joints Precision turntables Positioning systems Laboratory equipment Semiconductor auxiliary equipment Industrial rotary mechanisms Custom mechanical assemblies For applications requiring extremely high rigidity, heavy moment load, or high preload accuracy, RB crossed roller bearings may still be the better choice.

Selection Guide

Selecting the correct BB series metric ball bearing depends on load direction, moment load, rigidity requirement, installation space, speed, rotational accuracy, clearance, and working environment.

Choose BB Series for Smooth Rotation and Lower Torque

BB series bearings are recommended when the application needs compact installation, smooth rotation, and lower friction torque. They are especially suitable for light to medium load rotary systems.

Choose RB Crossed Roller Bearings for High Rigidity

If the application requires very high rigidity, high moment load capacity, high preload stiffness, or precision support for robot joints and machine tool rotary axes, RB crossed roller bearings are usually more suitable.

Evaluate Moment Load Carefully

Although BB series bearings can support moment load under suitable conditions, their moment rigidity is generally lower than crossed roller bearings. For large overturning moment or high stiffness requirements, the bearing selection should be carefully checked.

Check Radial and Axial Loads

BB series bearings can be used when radial and axial loads are within the allowable range. If axial load is dominant or requires high stiffness, angular contact or four-point contact thin section bearings may also be considered.

Consider Speed and Friction Torque

Ball bearing structures are often suitable for smoother and lower-torque operation. For applications requiring frequent rotation, low starting torque, or lightweight drive systems, BB series bearings may offer advantages over high-preload crossed roller bearings.

Confirm Mounting Space

BB series bearings are useful when the design requires a compact metric bearing with relatively large bore diameter and reduced section size. Shaft and housing dimensions should be confirmed before replacement.

Confirm Accuracy and Runout Requirements

For measuring instruments, optical equipment, inspection systems, and precision automation, runout accuracy and clearance should be checked carefully. LYDL can provide precision grades and inspection requirements according to customer applications.

Provide Application Data for Accurate Selection

To recommend the correct bearing model, please provide the bearing model or drawing, bore diameter, outside diameter, width, radial load, axial load, moment load, speed, required rigidity, runout accuracy, clearance requirement, lubrication method, and working environment.

Interchange and Replacement Reference

LYDL BB series metric ball bearings can be used as an alternative solution for some RB series crossed roller bearing applications. The replacement suitability depends on working conditions and should be confirmed according to technical requirements. BB series bearings may be suitable when: The load is light to medium. Lower friction torque is required. Smooth rotation is more important than maximum rigidity. The application does not require heavy preload. Moment load is within the allowable range. The mounting dimensions can be matched or adjusted. The required running accuracy can be achieved. RB crossed roller bearings are usually recommended when: The application requires high rigidity. Moment load is high. Preload stiffness is important. The equipment is a precision robot joint or machine tool rotary axis. High load capacity in a compact space is required. The original design specifically depends on crossed roller bearing stiffness. Note: Kaydon® part numbers and RB series references are used for interchange reference only. LYDL manufactures compatible or alternative bearing solutions according to customer drawings, dimensions, load requirements, and application conditions. Kaydon® and other brand names are registered trademarks of their respective owners.

Quality Assurance

LYDL controls the quality of BB series metric thin section ball bearings through material inspection, precision machining, heat treatment, raceway grinding, dimensional measurement, clearance control, assembly inspection, lubrication control, and final running tests. Key inspection items can include: Material inspection Hardness inspection Dimensional accuracy inspection Raceway surface quality inspection Roundness and runout inspection Diametral clearance inspection Rotational torque inspection Noise and vibration inspection Load-related dimensional inspection Appearance inspection Anti-rust and packaging inspection For precision applications, LYDL can provide P5 and P4 grade bearings with stricter dimensional control and improved running accuracy. Inspection reports can be provided according to customer requirements.

Manufacturing Process

LYDL follows a controlled manufacturing process to ensure stable quality and reliable bearing performance. Typical manufacturing process: Raw material inspection Ring blank preparation Precision turning Heat treatment and stabilization Precision grinding Raceway grinding Raceway superfinishing Cleaning and demagnetization Ball and cage preparation Bearing assembly Clearance inspection Lubrication Running test Final inspection Anti-rust treatment Packaging and shipment Each process is controlled to help ensure accurate dimensions, smooth rotation, stable load performance, and reliable service life.

Installation & Maintenance

Correct installation is important for the performance and service life of BB series metric ball bearings. Improper installation, excessive fitting force, contamination, misalignment, or incorrect clearance may affect running accuracy and cause abnormal torque, noise, temperature rise, or early failure.

Installation Recommendations

Keep the bearing, shaft, housing, and installation tools clean. Check shaft and housing accuracy before installation. Avoid direct impact on the bearing rings. Apply force only to the ring being fitted. Avoid misalignment during installation. Confirm the bearing seating surface and shoulder dimensions. Do not apply excessive preload unless confirmed by the design. Tighten mounting components evenly when required. Rotate the bearing slowly after installation to check smooth running.

Maintenance Recommendations

Use suitable lubrication according to speed, temperature, load, and working environment. Avoid dust, metal chips, moisture, and chemical contamination. Check running torque, noise, and temperature during operation. Avoid overload and excessive impact load. For long-term storage, keep the bearing sealed, dry, and protected from corrosion. If BB series bearings are used as an alternative to RB crossed roller bearings, load direction, moment load, rigidity, and installation structure should be verified before installation.

Packaging & Shipping

LYDL provides protective packaging suitable for domestic and export shipment. Bearings are treated with anti-rust protection and packed according to size, precision grade, shipping method, and customer requirements. Packaging options include: Anti-rust oil or anti-rust film Plastic bag or vacuum packaging Individual box packaging Foam or shockproof protection Export carton Wooden case for large-size bearings Neutral packaging LYDL brand packaging Customized label and marking Shipping methods include: Express delivery Air freight Sea freight Railway shipment Customer-designated forwarder Customized packaging, private label, barcode label, model marking, and customer-required shipping marks are available.

FAQ

What is a BB series metric thin section ball bearing?

It is a compact metric ball bearing designed for smooth rotation, space-saving installation, and combined load support under suitable working conditions.

Can BB series bearings replace RB crossed roller bearings?

BB series bearings can be used as an alternative solution for selected RB crossed roller bearing applications, but they are not suitable for every RB replacement. Final selection depends on load, moment, rigidity, speed, accuracy, and mounting structure.

What is the main difference between BB series and RB crossed roller bearings?

BB series bearings use balls and usually provide smoother rotation and lower friction torque. RB crossed roller bearings use crossed cylindrical rollers and usually provide higher rigidity and higher moment load capacity.

When should I choose BB series instead of RB crossed roller bearings?

BB series bearings are suitable when the application requires compact size, smooth rotation, lower friction torque, and moderate load capacity rather than maximum rigidity.

When should I keep using RB crossed roller bearings?

RB crossed roller bearings are recommended when the application requires high rigidity, high preload stiffness, heavy moment load capacity, or high precision support in robot joints, machine tools, and precision rotary tables.

Can BB series bearings support axial load and moment load?

Yes, BB series bearings can support axial load and moment load under suitable conditions. However, the allowable load and rigidity should be checked according to the specific model and application.

What materials are available?

LYDL can manufacture this series using 52100, SUJ2, 100Cr6, 100CrMn6, GCr15SiMn, and GCr15 bearing steel according to customer requirements.

What precision grades are available?

Available precision grades include P0, P6, P5, and P4. Customized precision, clearance, preload, lubrication, and running accuracy requirements can be discussed according to the application.

What information is needed for quotation?

Please provide the bearing model, interchange reference, drawing, quantity, precision grade, clearance requirement, material, lubrication requirement, radial load, axial load, moment load, speed, and application environment.

Request a Quote

Looking for BB series metric thin section ball bearings as an alternative solution for selected RB crossed roller bearing applications? LYDL can provide standard and customized BB series metric ball bearings according to your drawings, samples, or interchange references. Please send us the following information for a fast quotation: Bearing model or interchange reference Required quantity Drawing or installation dimensions Precision grade Material requirement Clearance or preload requirement Radial load, axial load, and moment load Speed and working conditions Required rigidity and runout accuracy Lubrication requirement Application environment Packaging and marking requirements Contact LYDL today to get technical support, model selection assistance, and a competitive quotation for BB series metric thin section ball bearings.