Inch Thin Section Four-Point Contact Ball Bearings – Sealed Type X

LYDL Equal Section Thin Section Sealed Four-Point Contact Ball Bearings Type X Technical Parameters

Note: Kaydon® and Silverthin® part numbers are used for interchange reference only. LYDL manufactures compatible equal section thin section sealed four-point 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 Four-Point Contact Ball Bearings Type X

Product Overview

LYDL Equal Section Thin Section Sealed Four-Point Contact Ball Bearings, also known as sealed Type X thin section bearings, are precision thin section bearings designed for compact rotary systems requiring combined load capacity, space-saving structure, grease retention, and improved contamination protection.

This bearing series combines a constant cross-section design, four-point contact raceway structure, and integrated seals. The constant cross-section structure helps reduce equipment weight and save radial installation space, while the four-point contact design allows one bearing to support radial load, axial load in both directions, and moment load under suitable operating conditions.

Compared with open Type X four-point contact thin section bearings, the sealed Type X design provides better protection against dust, light contamination, and lubricant loss. Compared with sealed radial contact thin section bearings, sealed Type X bearings offer stronger combined load capability and better support for bidirectional axial load and moment load. Compared with angular contact thin section bearings, sealed Type X bearings can often simplify compact bearing arrangements where a matched pair is difficult to install.

LYDL sealed four-point contact thin section bearings are widely used in robotics, precision rotary tables, radar antennas, optical tracking systems, medical equipment, semiconductor machinery, rotary encoders, measuring instruments, inspection systems, and automation equipment.

LYDL manufactures compatible equal section thin section sealed four-point contact ball bearings according to customer drawings, samples, application requirements, and interchange part numbers. Custom options are available for dimensions, material, precision grade, clearance, preload, seal type, lubrication, cage type, packaging, and special working conditions.

Product Brief

1. Equal Section Thin Section Sealed Four-Point Contact Ball Bearings, also known as sealed Type X thin section bearings, feature a constant cross-section four-point contact ball bearing structure with integrated seals for compact rotary systems requiring combined load capacity and contamination protection.
2. Sizes: Bore Diameter: 25.4–1016 mm / 1–40 inch, depending on series availability and sealing structure, suitable for robot joints, precision rotary systems, optical equipment, radar antennas, medical devices, automation machinery, and lightweight rotary mechanisms.
3. Performance Advantages: Compact structure; low weight; supports radial load, axial load in both directions, and moment load in a single bearing; improved dust protection; better grease retention; reduced maintenance compared with open-type bearings.
4. Material: 52100, SUJ2, 100Cr6, 100CrMn6, GCr15SiMn, GCr15 Bearing Steel.
5. Applications: Robotics, precision rotary tables, radar antennas, optical tracking systems, medical equipment, semiconductor equipment, rotary encoders, measuring systems, inspection equipment, automation machinery, and compact sealed rotary modules.
6. Accuracy: P0, P6, P5, P4; customized clearance, preload, seal type, lubrication, cage type, material, and precision grade are available according to drawings and application requirements.

Structural Features

Constant Cross-Section Design

The equal section structure allows the bearing to maintain a compact cross section while the bore diameter increases. This helps engineers design large hollow shafts, compact rotary modules, lightweight platforms, and space-saving mechanical structures.

Four-Point Contact Raceway Structure

The Type X four-point contact raceway structure allows the bearing to support radial load, axial load in both directions, and moment load in one bearing position under suitable operating conditions. This makes it useful for compact mechanisms where using multiple bearings is difficult.

Integrated Sealed Design

The sealed structure helps retain grease inside the bearing and provides improved protection against dust, light contamination, and external particles. This is especially useful in equipment where maintenance access is limited or where clean operation is required.

Combined Load Capacity in a Sealed Bearing

Compared with sealed radial contact thin section bearings, sealed four-point contact bearings provide stronger combined load support. They are suitable for applications where radial load, bidirectional axial load, and moment load may exist at the same time.

Compact Replacement for More Complex Arrangements

In some applications, a sealed Type X bearing can simplify the bearing arrangement by reducing the need for two angular contact bearings. This helps save space, reduce assembly complexity, and improve design flexibility.

Smooth Rotation with Controlled Clearance or Preload

LYDL can control internal clearance or light preload according to application requirements. Proper clearance or preload helps improve rigidity, running stability, positioning accuracy, and service life.

Custom Sealing and Lubrication Options

LYDL can provide suitable seal type, grease, clearance, preload, cage design, and precision grade according to speed, temperature, working environment, and maintenance requirements.

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

Different thin section bearing structures are suitable for different load conditions, speed requirements, and working environments.

Technical Parameters Table

The technical parameter table should be placed below this section. The table can include common LYDL equal section thin section sealed four-point 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 four-point contact ball bearings are suitable for compact rotary systems requiring combined load capacity, sealing protection, grease retention, and stable rotational performance.

Typical applications include:

Robotics and robot joints
Precision rotary tables
Radar and antenna systems
Optical tracking systems
Medical imaging equipment
Semiconductor equipment
Rotary encoders
Measuring instruments
Inspection systems
Precision gimbals
Automation machinery
Lightweight rotary platforms
Positioning systems
Compact sealed rotary modules
Aerospace auxiliary mechanisms
Clean environment rotary systems

For applications where radial load, axial load in both directions, moment load, and contamination protection are required in one bearing position, sealed Type X thin section bearings are often a practical choice.

Selection Guide

Selecting the correct sealed Type X thin section bearing depends on load direction, moment load, sealing requirement, installation space, rigidity, speed, precision grade, clearance or preload, lubrication, and working environment.

Choose Sealed Type X for Combined Loads and Protection

Sealed Type X four-point contact thin section bearings are recommended when the application requires radial load support, axial load support in both directions, moment load resistance, grease retention, and improved protection against dust or light contamination.

Choose Open Type X for Lower Torque or Higher Speed

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

Choose Sealed Radial Contact Type for Mainly Radial Loads

If the application mainly carries radial load and requires sealing protection, but does not need strong bidirectional axial load or moment load capacity, sealed radial contact thin section bearings may be a better and more economical choice.

Choose Angular Contact Type for High Axial Stiffness

If the application requires controlled preload, high axial stiffness, or a paired bearing arrangement, angular contact thin section bearings are usually recommended. Type A angular contact bearings are especially suitable when two bearings can be mounted as a matched pair.

Check Moment Load Requirements

For robot joints, optical platforms, radar antennas, and compact rotary tables, moment load is often an important selection factor. Sealed Type X bearings can support moment load in compact structures, but the final model should be selected according to load value, bearing size, speed, and required service life.

Consider Seal Friction and Limiting Speed

The seal improves grease retention and contamination protection, but it may increase friction torque and reduce limiting speed compared with open bearings. For higher speed applications, seal type, grease, clearance, preload, and temperature rise should be checked carefully.

Confirm Clearance or Preload

Clearance and preload affect rigidity, friction torque, operating temperature, positioning accuracy, and service life. Light preload may improve rigidity in precision positioning systems, while suitable clearance may be better for lower torque and higher speed.

Provide Application Data for Accurate Selection

To recommend the correct sealed Type X bearing model, please provide the bearing model or drawing, bore diameter, outside diameter, width, radial load, axial load, moment load, speed, precision grade, clearance or preload requirement, seal requirement, lubrication method, temperature, and working environment.

Interchange Reference

LYDL manufactures compatible equal section thin section sealed four-point 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 Type X four-point contact thin section bearing series.

Common interchange reference categories include:

Sealed Four-Point Contact Thin Section Bearings
Sealed Type X Thin Section Bearings
Metric Sealed Four-Point Contact Bearings
Inch Size Sealed Four-Point Contact 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 four-point 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 four-point contact ball bearings through material inspection, precision machining, heat treatment, raceway grinding, dimensional measurement, clearance or preload 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
Internal clearance or preload verification
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, stable torque performance, and reliable sealing quality. 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
Forging or ring blank preparation
Precision turning
Heat treatment and stabilization
Precision grinding
Four-point raceway grinding
Raceway superfinishing
Cleaning and demagnetization
Ball and cage preparation
Bearing assembly
Clearance or preload 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, stable combined load performance, reliable sealing performance, and long service life.

Installation & Maintenance

Correct installation is important for the performance and service life of sealed Type X thin section bearings. Improper installation, excessive fitting force, contamination, misalignment, or incorrect preload 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 seals during installation.
Avoid misalignment during installation.
Confirm the bearing mounting direction and fitting method.
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 Type X bearings are designed to reduce maintenance and improve protection, but correct installation, suitable load conditions, and proper shaft and housing accuracy are still important for reliable service life.

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 four-point contact ball bearing?

It is a precision thin section bearing with a constant cross-section design, four-point contact raceway structure, and integrated seals. It can support radial load, axial load in both directions, and moment load while providing grease retention and improved contamination protection.

What is the difference between sealed Type X and open Type X thin section bearings?

Sealed Type X bearings provide better dust protection and grease retention. Open Type X bearings usually have lower friction torque and higher speed capability in clean environments.

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

Sealed radial contact bearings are mainly designed for radial loads. Sealed Type X bearings are better for combined radial load, bidirectional axial load, and moment load in one compact bearing position.

What is the difference between sealed Type X and angular contact thin section bearings?

Angular contact bearings mainly support axial load in one direction and are often used as matched pairs. Sealed Type X bearings can support axial load in both directions and moment load in a single bearing position under suitable conditions.

Can sealed Type X bearings replace two angular contact bearings?

In some compact applications, sealed Type X bearings can reduce the need for two angular contact bearings. However, if very high axial stiffness or special preload control is required, matched angular contact bearings may still be more suitable.

Do sealed Type X bearings have lower speed than open Type X bearings?

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

When should I choose sealed Type X thin section bearings?

Choose sealed Type X bearings when the application requires compact structure, combined load capacity, bidirectional axial load support, moment load resistance, grease retention, and improved protection against dust or light contamination.

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, 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 four-point 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 or preload requirement, material, seal requirement, lubrication requirement, radial load, axial load, moment load, speed, and application environment.

Request a Quote

Looking for equal section thin section sealed four-point contact ball bearings for robotics, rotary tables, radar antennas, optical systems, medical devices, semiconductor equipment, or compact rotary modules?

LYDL can provide standard and customized sealed Type X thin section four-point contact 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 or preload requirement
Seal requirement
Radial load, axial load, and moment load
Speed and working 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 four-point contact ball bearings.

Available JU Sizes at a Glance

LYDL manufactures the sealed Type X series in eight standard inch sizes covering 101.6 mm to 304.8 mm bores, all with a constant 12.7 mm cross-section and integral double seals. Select a size for full dimensions, reference load ratings and mounting details:

• JU040XP0 Sealed Four-Point Contact Bearing (101.6 × 120.65 × 12.7 mm)
• JU045XP0 Sealed Four-Point Contact Bearing (114.3 × 133.35 × 12.7 mm)
• JU050XP0 Sealed Four-Point Contact Bearing (127 × 146.05 × 12.7 mm)
• JU060XP0 Sealed Four-Point Contact Bearing (152.4 × 171.45 × 12.7 mm)
• JU070XP0 Sealed Four-Point Contact Bearing (177.8 × 196.85 × 12.7 mm)
• JU080XP0 Sealed Four-Point Contact Bearing (203.2 × 222.25 × 12.7 mm)
• JU100XP0 Sealed Four-Point Contact Bearing (254 × 273.05 × 12.7 mm)
• JU120XP0 Sealed Four-Point Contact Bearing (304.8 × 323.85 × 12.7 mm)

JU Series Size Chart (Sealed Type X)