The SX0118/500 crossed roller bearing is an extra-large precision bearing with a 500 mm bore, 620 mm outside diameter and 56 mm width. Its wide central passage is suitable for large rotary tables, industrial scanners, optical systems and heavy precision positioning equipment.
The bearing provides a dynamic axial load rating of 560 kN, a static axial rating of 2,538 kN, a dynamic radial rating of 355 kN and a static radial rating of 1,244 kN. Its approximate mass is 44 kg.
An integrated inner ring and circumferentially split outer ring enable one bearing position to support radial, axial and tilting-moment loads. LYDL can supply P5, P4, P2 or customized accuracy, together with application-specific clearance, preload and lubrication.
For replacement orders, provide the complete original designation, suffix, drawing and operating conditions. Dimensional similarity alone does not confirm equivalent preload, running torque, accuracy, coating or load performance.
SX0118/500 Crossed Roller Bearing Overview
The SX0118/500 crossed roller bearing is an extra-large precision bearing with dimensions of 500 × 620 × 56 mm. Its approximate mass is 44 kg.
The bearing uses an integrated inner ring and a circumferentially split outer ring. Cylindrical rollers are arranged alternately at 90 degrees, enabling one bearing position to support radial loads, axial loads and substantial overturning moments.
Its 500 mm through-bore provides space for large hollow shafts, optical paths, scanning components, torque-motor assemblies, cable groups and rotary service connections.
SX0118/500 is the largest standard model currently listed in the LYDL SX dimensional range. It is intended for equipment that has exceeded the bore or load capacity of SX011880 but still requires the compact structure and rotational characteristics of an SX bearing.
For smaller bore sizes and other load-capacity options, view the complete LYDL SX crossed roller bearing series. Use a clear product photograph showing the 500 mm bore, integrated inner ring and split outer-ring structure. The visible marking should display LYDL SX0118/500.
The listed load ratings are catalogue reference values. They should not be interpreted as the maximum permissible payload of the complete machine.
Final selection must consider radial and axial forces, overturning moment, payload offset, shock, acceleration, speed, operating cycle, lubrication and required service life.
Do not combine load ratings from different manufacturers in one calculation. Bearings with the same boundary dimensions may use different internal geometries, roller quantities, materials and rating methods.
Why Choose the SX0118/500?
Extra-Large 500 mm Through-Bore
The 500 mm opening can accommodate a large hollow shaft, scanner aperture, optical path, torque-motor rotor, cable bundle or rotary connection.
This provides designers with substantial space for components and services that must pass through the center of rotation.
High Axial Load Capacity
SX0118/500 provides a dynamic axial rating of 560 kN and a static axial rating of 2,538 kN.
These values provide substantial capacity for large fixtures, slowly indexing platforms and equipment carrying heavy axial loads.
High Radial Capacity
The dynamic radial rating is 355 kN, while the static radial rating is 1,244 kN.
Actual permissible loading must still be determined from the combined-load condition, moment arm, required life and mounting-structure rigidity.
Compact Axial Structure
The 56 mm width remains compact relative to the 500 mm bore and 620 mm outside diameter.
This can reduce overall machine height compared with conventional arrangements using two widely separated bearing positions.
Precision Options for Large Equipment
P5, P4, P2 and customized accuracy options are available. The required grade should be determined from the complete system-level runout and positioning requirements.
Main Applications
Extra-Large Direct-Drive Rotary Tables
SX0118/500 can support large direct-drive tables requiring a 500 mm central opening. The bore provides space for a torque-motor rotor, encoder, cables and process connections.
Motor heat, rotor balance, preload, starting torque and continuous operating temperature must be evaluated together.
Large Industrial CT and NDT Systems
The bearing can support scanning platforms used for industrial computed tomography and nondestructive testing of large components.
The wide aperture provides space for scanning equipment or test objects. Stable speed, low runout and structural rigidity are important for image quality.
Telescope and Space-Surveillance Platforms
SX0118/500 can support large telescope mounts, electro-optical systems and tracking platforms requiring a wide optical or cable passage.
Wind, vibration, drive forces, center-of-gravity offset and outdoor temperature variation should be included in the system design.
Heavy Calibration and Precision Assembly Equipment
The bearing can support large fixtures used for calibration, alignment, aerospace-component assembly and industrial testing.
Fixture mass, payload offset, acceleration, reversing torque and emergency-stop loads must be included in the load spectrum. Use consistent industrial lighting and natural colors. Equipment dimensions and mechanical structures should remain realistic.
*The SX011868 C0r value shown follows the current LYDL SX series dataset and should be confirmed against the applicable quotation drawing.
The SX011880 crossed roller bearing should be considered when a 400 mm bore is sufficient and lower mass is preferred.
The SX011868 crossed roller bearing provides a more compact 420 mm outside diameter for equipment that only requires a 340 mm central opening.
SX0118/500 should be selected when the 500 mm passage or its substantially higher axial and radial capacity is necessary.
SX0118/500 or a Large Slewing Bearing?
Both SX0118/500 and a large slewing bearing can support combined loads, but they are designed around different priorities.
SX0118/500 should be considered when rotational accuracy, compact cross-section and controlled running performance are important.
A slewing bearing may be more suitable when the equipment requires integral mounting holes, internal or external gears, integral seals or a highly structural bearing arrangement.
The standard SX0118/500 does not include integral mounting holes, seals or gear teeth.
Large-Diameter Moment-Load Evaluation
Payload weight alone is not sufficient for selecting an extra-large crossed roller bearing.
A load located away from the bearing center creates an overturning moment. Acceleration, braking and external forces may increase this moment considerably.
The calculation should include:
Rotary-table and fixture mass
Maximum payload
Payload center-of-gravity offset
Acceleration and deceleration
Drive or gear forces
Emergency-stop loads
Cable-chain and hose resistance
Wind load for outdoor systems
Housing and flange deformation
The mounting structure should be analyzed using the same maximum-load cases applied during bearing selection.
Accuracy and System Performance
LYDL can supply SX0118/500 in P5, P4, P2 or customized accuracy classes.
A higher accuracy class may reduce bearing-originated runout, but it cannot compensate for inaccurate or flexible mounting components.
Final system accuracy also depends on:
Shaft and housing geometry
Mounting-face flatness
Flange parallelism
Clamping deformation
Platform rigidity
Drive eccentricity
Encoder installation
Payload deflection
Thermal expansion
For large optical, calibration or scanning systems, specify radial runout, axial runout, angular error and positioning repeatability separately.
Internal Clearance and Preload
Internal clearance can reduce friction torque and sensitivity to mounting or thermal variation.
Controlled preload can increase moment rigidity, improve reversal accuracy and reduce settling time. It may be preferred for large direct-drive platforms and scanning equipment.
Because of the large bearing diameter, preload can be sensitive to housing deformation and temperature differences. Excessive preload may cause high torque and operating temperature.
Specify the permissible starting torque, running torque and torque variation when requesting a preloaded bearing.
Thermal Expansion
Large motors and surrounding equipment can create a significant temperature difference between the inner ring, outer ring and housing.
Aluminum mounting structures expand more than bearing steel. This difference may alter the bearing fit or effective preload.
The thermal review should consider:
Motor heat generation
Shaft and housing materials
Continuous operating time
Cooling method
Ambient temperature
Temperature difference between the rings
Outdoor seasonal variation
Running torque and accuracy should be checked after the equipment reaches its normal operating temperature.
Suffix and Interchangeability
Suffixes may identify clearance, preload, coating, accuracy or design generation. Their meanings are manufacturer-specific.
Examples found in Schaeffler technical documentation include RL0 for reduced clearance, VSP for preload and RR for a Corrotect-coated configuration.
An SX0118/500-A-VSP should not automatically be replaced by an unsuffixed SX0118/500.
Before approving a replacement, confirm:
Complete original designation and suffix
Boundary dimensions and tolerances
Accuracy and runout
Internal clearance or preload
Starting and running torque
Axial and radial load ratings
Material and heat treatment
Lubricant
Coating or corrosion protection
Inspection and traceability documents
Third-party trademarks are used only for technical identification and comparison. Their use does not imply authorization, affiliation or original-brand manufacture.
Mounting and Flange Design
The split outer ring requires continuous and uniform retention by a rigid housing cover or flange.
A reference adjacent construction may use 24 × M24 flange screws. This does not mean the bearing itself contains integrated mounting holes.
The final screw size, quantity, strength class and tightening torque must be calculated for the actual housing, flange material and operating loads.
Both mounting faces should be flat, parallel, clean and free from burrs. Uneven clamping can distort the raceways and increase rotational torque.
Tighten the flange screws gradually in a diagonal sequence. Rotate the bearing during tightening and monitor any change in starting or running torque.
Retaining elements position the split outer ring during handling and assembly. They should not be treated as the primary structural load path.
Handling the 44 kg Bearing
SX0118/500 weighs approximately 44 kg and requires suitable mechanical lifting equipment.
Support the bearing evenly using clean, load-rated lifting equipment. Do not lift it by only one section of the split outer ring.
Keep the bearing in its original protective packaging until the mounting area is clean and ready. Protect it from impact, contamination and accidental ring separation.
Installation force must be applied uniformly to the appropriate ring. Do not strike the bearing directly.
Lubrication and External Sealing
The standard SX0118/500 is open and does not contain integral seals.
External sealing is required where dust, coolant, water or outdoor contamination may reach the raceways.
Select grease according to speed, load, oscillation angle, temperature and maintenance interval. Avoid excessive grease because it can increase torque and heat.
Optical, CT and calibration systems may require low-noise or low-particle lubricant. Outdoor equipment may need additional moisture and corrosion protection.
LYDL Manufacturing and Quality Control
LYDL can manufacture SX0118/500 using GCr15 or GCr15SiMn bearing steel. Accuracy, clearance, preload, lubricant and marking can be configured according to customer requirements.
Manufacturing and inspection may include:
Raw-material verification
Precision turning
Heat treatment and cryogenic stabilization
Raceway grinding and superfinishing
Roller manufacturing and optical sorting
Precision dimensional measurement
Deep cleaning and demagnetization
Controlled preload assembly
Starting and running-torque testing
Radial and axial runout inspection
Final visual inspection
Laser marking
Rust prevention
Inspection methods and acceptance limits should be agreed before production.
Inspection Documents and Export Packaging
Available documentation may include:
Material certificate
Hardness report
Dimensional inspection report
Radial and axial runout report
Starting or running-torque record
Clearance or preload record
Individual traceability information
Packaging photographs
Individual anti-rust protection, moisture-resistant wrapping, shock-resistant support and reinforced export wooden cases can be provided.
Lifting points, center-of-gravity markings, orientation labels and moisture protection should be specified for international transport. Use real inspection and packaging photographs. The bearing marking, protective package label and wooden-case information should consistently display SX0118/500.
These sources provide general engineering and comparison information. Final SX0118/500 selection should be based on the confirmed LYDL specification, operating conditions and approved drawing.
Information Required for an Accurate Quotation
Please provide:
Required quantity
Complete designation and suffix
Required accuracy class
Clearance or preload requirement
Radial and axial loads
Tilting moment or payload offset
Maximum and continuous speed
Operating cycle
Operating temperature
Housing and shaft materials
Lubrication and sealing requirements
Corrosion-protection requirements
Inspection-document requirements
Delivery destination and required date
Frequently Asked Questions
1. Why does the SX0118/500 designation contain a slash?
The slash separates the dimension-series designation from the 500 mm bore reference. It should remain in technical documents, labels and purchase orders.
2. What is the main advantage of the 500 mm through-bore?
It provides substantial space for a large scanner aperture, hollow shaft, optical path, motor rotor, cable bundle or rotary service connection.
3. Can SX0118/500 replace a large slewing bearing?
Not automatically. SX0118/500 focuses on compact precision rotation, while many slewing bearings provide integral mounting holes, gears and seals.
4. Is SX0118/500 suitable for a large direct-drive motor?
Potentially, but motor heat, rotor balance, preload, starting torque, continuous torque and cooling must be evaluated together.
5. Why is thermal analysis important on a 620 mm bearing?
A large diameter makes dimensional changes from temperature and housing expansion more significant. These changes can alter fit, preload and running torque.
6. Does the 24 × M24 reference mean the bearing has mounting holes?
No. It refers to a possible surrounding flange arrangement. The standard SX0118/500 does not contain integral mounting holes.
7. How should the 44 kg bearing be handled?
Use suitable mechanical lifting equipment and support the bearing evenly. Do not lift it by one section of the split outer ring.
8. Which documents are recommended for this large bearing?
Typical requirements include material certification, dimensional inspection, radial and axial runout, torque or preload records, individual traceability and packaging photographs.
Request an SX0118/500 Quotation
Send LYDL your complete SX0118/500 designation, quantity, required accuracy, preload or clearance and operating conditions.
You can contact LYDL for SX0118/500 pricing and technical support to request drawings, inspection documents, application review and export-delivery information.
Use consistent industrial lighting and natural colors. Equipment dimensions and mechanical structures should remain realistic.
Use real inspection and packaging photographs. The bearing marking, protective package label and wooden-case information should consistently display SX0118/500.