LYDL Equal Section Thin Section Sealed Radial Contact Ball Bearings Technical Parameters

Model	d (in)	d (mm)	D (in)	D (mm)	B (in)	B (mm)	Weight (kg)	Radial Static Co (N)	Radial Dynamic Cr (N)	Limiting Speed (RPM)	Kaydon Equivalent	Silverthin Equivalent
LYDL-040UU	4.00	101.600	4.7500	120.650	0.5000	12.700	0.249	9,340	5,740	1,640	JU040CP0	JSU040CP0
LYDL-042UU	4.25	107.950	5.0000	127.000	0.5000	12.700	0.263	9,880	5,870	1,520	JU042CP0	JSU042CP0
LYDL-045UU	4.50	114.300	5.2500	133.350	0.5000	12.700	0.277	10,410	6,010	1,440	JU045CP0	JSU045CP0
LYDL-047UU	4.75	120.650	5.5000	139.700	0.5000	12.700	0.295	10,940	6,090	1,360	JU047CP0	JSU047CP0
LYDL-050UU	5.00	127.000	5.7500	146.050	0.5000	12.700	0.308	11,520	6,180	1,300	JU050CP0	JSU050CP0
LYDL-055UU	5.50	139.700	6.2500	158.750	0.5000	12.700	0.336	12,590	6,410	1,180	JU055CP0	JSU055CP0
LYDL-060UU	6.00	152.400	6.7500	171.450	0.5000	12.700	0.367	13,660	6,630	1,080	JU060CP0	JSU060CP0
LYDL-065UU	6.50	165.100	7.2500	184.150	0.5000	12.700	0.395	14,750	6,810	1,000	JU065CP0	JSU065CP0
LYDL-070UU	7.00	177.800	7.7500	196.850	0.5000	12.700	0.422	15,790	6,980	920	JU070CP0	JSU070CP0
LYDL-075UU	7.50	190.500	8.2500	209.550	0.5000	12.700	0.449	16,860	7,120	860	JU075CP0	JSU075CP0
LYDL-080UU	8.00	203.200	8.7500	222.250	0.5000	12.700	0.481	17,930	7,340	810	JU080CP0	JSU080CP0
LYDL-090UU	9.00	228.600	9.7500	247.650	0.5000	12.700	0.535	20,060	7,700	720	JU090CP0	JSU090CP0
LYDL-100UU	10.00	254.000	10.7500	273.050	0.5000	12.700	0.594	22,200	7,920	650	JU100CP0	JSU100CP0
LYDL-110UU	11.00	279.400	11.7500	298.450	0.5000	12.700	0.649	24,330	8,360	590	JU110CP0	JSU110CP0
LYDL-120UU	12.00	304.800	12.7500	323.850	0.5000	12.700	0.708	26,470	8,780	540	JU120CP0	JSU120CP0

Note: Kaydon® and Silverthin® part numbers are used for interchange reference only. LYDL manufactures compatible equal section thin section sealed radial contact ball bearings according to customer drawings, dimensions, load requirements, and application conditions. Kaydon® and Silverthin® are registered trademarks of their respective owners.

Equal Section Thin Section Sealed Radial Contact Ball Bearings

Product Overview

LYDL Equal Section Thin Section Sealed Radial Contact Ball Bearings are precision thin section bearings designed for compact rotary systems requiring smooth rotation, low weight, space-saving structure, grease retention, and improved contamination protection. This bearing series combines a constant cross-section radial contact structure with integrated sealing. Compared with standard ball bearings, equal section thin section bearings can help reduce equipment weight and save radial installation space. Compared with open-type radial contact thin section bearings, the sealed design provides better protection against dust, light contamination, and lubricant loss. The radial contact raceway structure is mainly designed to support radial loads. It can also support limited axial loads under suitable operating conditions, but it is not the first choice for high axial stiffness, heavy axial preload, or high moment load applications. For higher axial rigidity or paired preload arrangements, angular contact thin section bearings are recommended. For combined radial, bidirectional axial, and moment loads in a single bearing position, four-point contact Type X thin section bearings may be more suitable. LYDL sealed radial contact thin section bearings are widely used in automation equipment, measuring instruments, rotary encoders, optical systems, medical equipment, semiconductor machinery, inspection systems, laboratory devices, and compact rotary mechanisms where clean operation and reduced maintenance are important. LYDL manufactures compatible equal section thin section sealed radial contact ball bearings according to customer drawings, samples, application requirements, and interchange part numbers. Custom options are available for dimensions, material, precision grade, clearance, lubrication, seal type, cage type, packaging, and special working conditions.

Product Brief

1. Equal Section Thin Section Sealed Radial Contact Ball Bearings feature a constant cross-section radial contact ball bearing structure with integrated seals, designed for compact rotary systems requiring grease retention and contamination protection.
2. Sizes: Bore Diameter: 25.4–1016 mm / 1–40 inch, depending on series availability and sealing structure, suitable for compact shafts, precision instruments, automation equipment, optical systems, medical devices, and lightweight rotary mechanisms.
3. Performance Advantages: Space-saving design; low weight; smooth rotation; good radial load capacity; improved dust protection; better grease retention; reduced maintenance requirements compared with open-type radial contact bearings.
4. Material: 52100, SUJ2, 100Cr6, 100CrMn6, GCr15SiMn, GCr15 Bearing Steel.
5. Applications: Automation machinery, measuring equipment, rotary encoders, optical instruments, medical equipment, semiconductor equipment, inspection systems, packaging machinery, laboratory devices, and compact rotary modules requiring sealed bearing protection.
6. Accuracy: P0, P6, P5, P4; customized clearance, lubrication, seal type, cage type, material, and precision grade are available according to drawings and application requirements.

Structural Features

Constant Cross-Section Design

The main feature of this series is the equal section structure. Within the same bearing series, the bearing cross section remains nearly constant while the bore diameter increases. This allows engineers to design larger shafts, hollow rotary structures, or compact assemblies without significantly increasing bearing size or weight.

Radial Contact Raceway Structure

The radial contact raceway structure is mainly designed to carry radial loads. It is suitable for smooth rotary systems where radial support, compact installation, and low running torque are important. Limited axial load can be supported under suitable conditions, but heavy axial load or high preload applications should be evaluated carefully.

Integrated Sealed Structure

Compared with open radial contact thin section bearings, sealed radial contact bearings provide better grease retention and improved protection against dust, light contamination, and external particles. This helps reduce maintenance frequency and improves reliability in applications where relubrication is difficult.

Smooth Rotation with Reduced Maintenance

The sealed design helps keep lubricant inside the bearing and reduce contamination entering the raceway area. This makes the series suitable for precision instruments, encoders, optical systems, automation equipment, and medical devices where clean and stable operation is required.

Space-Saving and Lightweight

Thin section sealed radial contact ball bearings are ideal for equipment with limited radial installation space. They help reduce total system weight while maintaining smooth rotation and stable radial support.

Custom Sealing and Lubrication Options

LYDL can provide suitable sealing and lubrication solutions according to speed, temperature, working environment, and maintenance requirements. Grease type, seal material, clearance, and precision grade can be customized according to customer applications.

Difference Between Sealed Radial Contact, Open Radial Contact, Angular Contact, and Type X Bearings

Different thin section bearing structures are suitable for different load directions and working environments.

Item	Sealed Radial Contact Bearings	Open Radial Contact Bearings	Angular Contact Bearings	Four-Point Contact Type X Bearings
Main Load Direction	Mainly radial load	Mainly radial load	Radial load + axial load in one direction	Radial load + axial load in both directions + moment load
Sealing Protection	Better dust protection and grease retention	No seal, easier lubrication and lower seal drag	Usually open or customized	Usually open or customized
Maintenance	Lower maintenance requirement	Requires cleaner environment or regular lubrication	Depends on arrangement and lubrication	Depends on preload and working condition
Friction Torque	Slightly higher than open type due to seals	Usually lower	May be higher when preloaded	Moderate, depending on clearance or preload
Speed Capability	Usually lower than open type because of seal friction	Usually better for higher speed	Depends on preload and lubrication	Depends on clearance, preload, and load condition
Axial Load Capacity	Limited axial load	Limited axial load	Better one-direction axial load capacity	Better bidirectional axial load capacity
Typical Use	Encoders, instruments, optical equipment, medical devices, automation systems	Instruments, clean rotary mechanisms, low-torque systems	Precision rotary axes, paired bearing systems, high axial stiffness applications	Robot joints, rotary tables, radar antennas, compact combined-load systems
Selection Priority	Choose when radial load, sealing, and grease retention are important	Choose when low torque and higher speed are more important	Choose when axial stiffness and preload control are required	Choose when combined load capacity is required in one bearing position

Technical Parameters Table

The technical parameter table should be placed below this section. The table can include common LYDL equal section thin section sealed radial contact ball bearing models, bore diameter, outside diameter, width, weight, load ratings, limiting speed, and interchange references.

Typical Applications

LYDL equal section thin section sealed radial contact ball bearings are suitable for compact rotary systems that require smooth rotation, radial support, lubricant retention, and improved protection against dust or light contamination. Typical applications include: Automation machinery Measuring instruments Rotary encoders Optical instruments Medical equipment Semiconductor equipment Inspection systems Packaging machinery Laboratory equipment Precision instruments Compact rotary modules Light-duty robotic mechanisms Positioning devices Aerospace auxiliary mechanisms Clean environment rotary systems For applications requiring heavy axial load, high preload, or strong moment stiffness, angular contact or four-point contact thin section bearings should be considered.

Selection Guide

Selecting the correct sealed radial contact thin section bearing depends on load direction, sealing requirement, installation space, speed, accuracy, lubrication, temperature, and working environment.

Choose Sealed Radial Contact Type for Dust Protection and Grease Retention

Sealed radial contact thin section bearings are recommended when the application mainly carries radial load and requires improved protection against dust, light contamination, and lubricant loss.

Choose Open Radial Contact Type for Lower Torque or Higher Speed

If the application operates in a clean environment and requires lower friction torque or higher speed capability, open radial contact thin section bearings may be more suitable than sealed bearings.

Choose Angular Contact Type for Higher Axial Stiffness

If the application has significant axial load, controlled preload, or higher axial rigidity requirements, angular contact thin section bearings are usually more suitable than radial contact bearings.

Choose Four-Point Contact Type X for Combined Loads

If one bearing position must support radial load, axial load in both directions, and moment load, Type X four-point contact thin section bearings may be the better choice.

Consider Seal Friction and Limiting Speed

The seal improves grease retention and protection, but it may also increase friction torque and reduce limiting speed compared with open bearings. For high-speed applications, seal type, lubrication, clearance, and heat generation should be checked carefully.

Confirm Clearance and Lubrication

Bearing clearance affects running torque, temperature rise, and service life. Grease selection should match the operating speed, temperature, load, and working environment. LYDL can recommend suitable lubrication based on application conditions.

Confirm Precision Grade

For general automation applications, standard precision may be sufficient. For rotary encoders, optical systems, measuring instruments, medical equipment, and precision automation, P5 or P4 accuracy can be selected according to the required running accuracy.

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, speed, precision grade, clearance requirement, sealing requirement, lubrication method, temperature, and working environment.

Interchange Reference

LYDL manufactures compatible equal section thin section sealed radial contact ball bearings according to customer drawings, samples, or interchange part numbers. The models in this series can be used as replacement reference for common sealed radial contact thin section bearing series. Common interchange reference categories include: Sealed Radial Contact Thin Section Bearings Metric Sealed Thin Section Bearings Inch Size Sealed Thin Section Bearings Compact Sealed Thin Section Ball Bearings Custom Sealed Thin Section Bearing Solutions Note: Kaydon® and Silverthin® part numbers are used for interchange reference only. LYDL manufactures compatible thin section sealed radial contact ball bearings according to customer drawings, dimensions, load requirements, and application conditions. Kaydon® and Silverthin® are registered trademarks of their respective owners.

Quality Assurance

LYDL controls the quality of equal section thin section sealed radial contact ball bearings through material inspection, precision machining, heat treatment, raceway grinding, dimensional measurement, clearance control, seal inspection, 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 Radial clearance inspection Seal appearance inspection Seal fit and protection inspection Grease filling inspection Rotational torque inspection Noise and vibration inspection Appearance inspection Anti-rust and packaging inspection For precision applications, LYDL can provide P5 and P4 grade bearings with stricter dimensional control, improved running accuracy, and stable rotational performance. Inspection reports can be provided according to customer requirements.

Manufacturing Process

LYDL follows a controlled manufacturing process to ensure stable quality and reliable performance. Typical manufacturing process: Raw material inspection Forging or 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 Grease filling Seal installation Running test Final inspection Anti-rust treatment Packaging and shipment Each process is controlled to help ensure accurate dimensions, smooth raceway surface, reliable sealing performance, stable lubrication, and long service life.

Installation & Maintenance

Correct installation is important for the performance and service life of sealed radial contact thin section bearings. Improper installation, excessive fitting force, contamination, misalignment, or incorrect clearance may affect bearing accuracy and cause abnormal torque, noise, seal damage, 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 and seals. Apply force only to the ring being fitted. Avoid damaging the seal during installation. Avoid misalignment during installation. 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 the bearing within the recommended speed, load, and temperature range. Avoid dust, metal chips, moisture, and chemical contamination. Do not wash out the factory-filled grease unless required by a special process. 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. Sealed bearings are designed to reduce maintenance, but correct installation and suitable working conditions are still important for service life and running accuracy.

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, sealing structure, 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 an equal section thin section sealed radial contact ball bearing?

It is a precision thin section bearing with a constant cross-section design, radial contact raceway structure, and integrated seals. It is mainly used for radial loads while providing grease retention and improved protection against dust or light contamination.

What is the difference between sealed radial contact and open radial contact thin section bearings?

Sealed radial contact bearings provide better dust protection and grease retention. Open radial contact bearings usually have lower friction torque and may be better for clean, higher-speed applications.

Can sealed radial contact thin section bearings support axial load?

They can support limited axial load under suitable conditions, but they are not the best choice for heavy axial load or high axial stiffness applications.

When should I choose angular contact thin section bearings instead?

Angular contact bearings are recommended when the application requires higher axial stiffness, controlled preload, matched pair mounting, or significant axial load capacity.

When should I choose Type X four-point contact thin section bearings?

Type X bearings are recommended when one bearing position must support radial load, axial load in both directions, and moment load in a compact structure.

Do sealed bearings have lower speed than open bearings?

In many cases, sealed bearings have lower limiting speed than open bearings because the seal can add friction and heat. The final speed should be checked according to seal type, grease, clearance, load, and working temperature.

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, seal type, lubrication, and running accuracy requirements can be discussed according to the application.

Can LYDL manufacture bearings according to Kaydon or Silverthin interchange part numbers?

Yes. LYDL can manufacture compatible thin section sealed radial contact ball bearings according to drawings, samples, or interchange part numbers. These part numbers are used only as reference for dimensions and replacement selection.

What information is needed for quotation?

Please provide the bearing model, interchange part number, drawing, quantity, precision grade, clearance requirement, material, seal requirement, lubrication requirement, speed, load conditions, and application environment.

Request a Quote

Looking for equal section thin section sealed radial contact ball bearings for automation equipment, rotary encoders, optical systems, measuring instruments, medical devices, semiconductor equipment, or compact rotary mechanisms? LYDL can provide standard and customized sealed radial contact thin section ball bearings according to your drawings, samples, or interchange part numbers. Please send us the following information for a fast quotation: Bearing model or interchange part number Required quantity Drawing or installation dimensions Precision grade Material requirement Clearance requirement Seal requirement Speed and load conditions Lubrication requirement Working temperature and environment Packaging and marking requirements Contact LYDL today to get technical support, model selection assistance, and a competitive quotation for equal section thin section sealed radial contact ball bearings.