The SX011848 crossed roller bearing is a large-aperture precision bearing with a 240 mm bore, 300 mm outside diameter and 28 mm width. It is designed for large inspection stages, medical imaging subassemblies, semiconductor equipment and optical or antenna positioning systems.
Its alternately crossed cylindrical rollers support radial, axial and tilting-moment loads in one compact bearing position. The SX011848 provides a dynamic axial load rating of 149 kN, a static axial rating of 612 kN and an approximate mass of 5.3 kg.
LYDL can supply SX011848 bearings in P5, P4, P2 or customized accuracy classes. Clearance, preload, lubricant and inspection requirements can be selected according to platform rigidity, rotational accuracy, operating temperature and environmental conditions.
When replacing an INA/Schaeffler or another brand bearing, provide the complete designation and suffix. Dimensional similarity alone does not confirm equivalent preload, running torque, accuracy, coating or service performance.
SX011848 Crossed Roller Bearing Overview
The SX011848 crossed roller bearing is a high-capacity, large-aperture precision bearing with dimensions of 240 × 300 × 28 mm. Its approximate mass is 5.3 kg.
The bearing combines an integrated inner ring with a circumferentially split outer ring. Cylindrical rollers are arranged alternately at 90 degrees, enabling the bearing to support radial loads, axial loads and overturning moments simultaneously.
Its 240 mm bore provides a wide passage for hollow shafts, optical paths, cable groups, scanning components and rotary service connections. The compact 28 mm width helps limit the axial height of the complete positioning system.
SX011848 is positioned between the smaller SX011840 and the significantly larger SX011860. It provides a substantial increase in static capacity without increasing the outside diameter to 380 mm.
For additional bore sizes and load-rating options, view the complete LYDL SX crossed roller bearing series. Use a clear, high-resolution product photograph showing the slim cross-section, integrated inner ring and split outer-ring structure. The product marking should display LYDL SX011848.
The listed load ratings are catalogue reference values. They should not be treated as the maximum permissible equipment payload.
Final bearing selection must consider radial and axial forces, load offset, overturning moment, acceleration, shock, speed, operating cycle, lubrication and required service life.
Load-rating values from different manufacturers should not be combined in one calculation. Internal geometry, roller quantity, materials and rating methods may differ even when bearing dimensions are identical.
For more information about bearing structures and combined-load calculations, refer to the LYDL crossed roller bearing selection guide.
Why Choose the SX011848?
Large 240 mm Through-Bore
The 240 mm central opening can accommodate a large hollow shaft, optical path, scanner components, cable groups or process connections.
This is particularly useful in inspection, medical imaging and optical equipment where functional components must pass through the center of rotation.
Substantial Static Capacity
SX011848 has a static axial load rating of 612 kN and a static radial rating of 300 kN. These values provide useful load margin for slowly rotating platforms and heavy fixtures.
Static ratings must still be evaluated together with contact safety, moment loading and housing deformation.
Compact 28 mm Width
The bearing maintains a 28 mm axial width despite its large bore. This can shorten the rotary assembly and reduce the distance between the external load and bearing center.
High Moment Rigidity
Crossed rollers support loads in multiple directions and resist tilting caused by an offset payload. This is valuable for large inspection tables, scanners and positioning platforms.
Configurable Accuracy and Preload
P5, P4, P2 and customized accuracy options are available. Internal clearance or preload can be selected according to rotational accuracy, rigidity, torque and temperature requirements.
Main Applications
Large Inspection and Metrology Stages
SX011848 can support dimensional inspection systems, non-contact measuring platforms and large sensor turntables. Its wide central opening provides space for cables, cameras or optical components.
Runout, rotational torque and structural deflection should be specified according to the measurement uncertainty of the complete machine.
Medical Imaging Subassemblies
The large aperture and compact width can suit medical scanners, detector-positioning mechanisms and diagnostic-equipment rotary structures.
Low-noise operation, lubricant compatibility, cleanliness and traceability should be specified before production. A standard industrial bearing configuration should not automatically be considered medical-equipment ready.
Semiconductor and Display Inspection Equipment
SX011848 can support large inspection stages used for semiconductor wafers, displays or precision electronic components.
Clean-compatible grease, controlled assembly and protective packaging should be specified when particle generation or contamination is restricted.
Antenna and Optical Positioning Systems
The bearing can support antenna platforms, mirrors, laser-tracking systems and optical positioning mechanisms.
Wind forces, cable drag, acceleration and the distance between the equipment center of gravity and bearing center must be included in the moment-load calculation. Combine four realistic application scenes with concise English labels:
Metrology Stage
Medical Imaging
Semiconductor Inspection
Optical Positioning
Use consistent industrial lighting and natural colors. Avoid exaggerated futuristic equipment that may make the image appear artificially generated.
SX011848 should be considered when a 240 mm aperture or higher load capacity than SX011840 is required.
SX011840 can reduce housing size and rotating mass when a 200 mm bore is sufficient. SX011860 provides substantially higher capacity and a 300 mm bore but requires a larger mounting envelope and more robust handling.
If the application requires an alternative ring structure or a wider selection of standard bore sizes, compare the LYDL RB series crossed roller bearings.
Evaluating Tilting-Moment Loads
Large platforms frequently carry payloads away from the bearing center. The resulting tilting moment can be more important than the payload weight alone.
The moment is approximately the applied force multiplied by the perpendicular distance between the force and bearing center.
Include the following loads in the engineering review:
Platform and fixture weight
Maximum payload
Payload center-of-gravity offset
Acceleration and deceleration
Emergency-stop forces
Cable-chain or hose resistance
Wind forces for outdoor positioning equipment
Transportation loads where relevant
A high bearing load rating cannot compensate for a flexible mounting flange. Housing and flange deformation should be calculated under the same load cases.
Accuracy and System Performance
LYDL can supply SX011848 in P5, P4, P2 or customized accuracy classes.
P5 is suitable for many industrial rotary platforms. P4 or P2 may be selected for inspection, metrology or optical equipment with more demanding runout requirements.
Final system accuracy also depends on:
Shaft and housing geometry
Mounting-face flatness
Flange parallelism
Clamping deformation
Table rigidity
Drive-system eccentricity
Encoder installation
Thermal expansion
Payload deformation
A high-accuracy bearing will not correct inaccurate or flexible surrounding components.
Internal Clearance and Preload
Internal clearance can reduce friction torque and sensitivity to mounting or thermal variation. It may be suitable for support applications without strict moment-rigidity requirements.
Controlled preload can improve rigidity, reversal accuracy and platform settling time. It is commonly considered for inspection stages and precision positioning systems.
Excessive preload may increase starting torque, operating temperature and sensitivity to flange deformation. Preload should be selected together with the drive motor, lubricant and mounting fits.
For large inspection platforms, specify the permissible torque variation in addition to the required runout and rigidity.
Suffix and Designation Explanation
Bearing suffixes may identify internal clearance, preload, coating, accuracy or design generation. Their meanings are manufacturer-specific.
Examples found in Schaeffler technical documentation include:
RL0: reduced internal clearance
VSP: defined preload
RR: Corrotect-coated configuration
A: may identify a particular design generation
The exact suffix meaning should be checked using the original drawing or applicable catalogue. An SX011848-A-VSP should not automatically be replaced by an unsuffixed SX011848.
Replacement and Interchangeability
SX011848 and LRC 24028 may be used as dimensional interchange references. Functional interchangeability requires further verification.
Before confirming a replacement, compare:
Complete designation and suffix
Bore, outside diameter and width
Dimensional tolerances
Accuracy class and runout
Internal clearance or preload
Starting and running torque
Load-rating basis
Lubricant
Material and heat treatment
Coating or corrosion protection
Inspection and traceability requirements
LYDL can review the original product label, drawing, catalogue data or inspection report before confirming replacement feasibility.
Third-party trademarks are used only for technical identification and comparison. Their use does not imply authorization, affiliation or original-brand manufacture.
Mounting and Structural Design
The circumferentially split outer ring requires continuous and uniform retention. It should be clamped by a rigid housing cover or flange.
A reference mounting arrangement may use 24 × M12 flange screws. Final screw size, quantity, strength class and tightening torque must be calculated for the actual structure and operating loads.
Mounting surfaces should be flat, parallel, clean and free from burrs. Local high points or insufficient flange thickness may distort the bearing raceways.
Tighten the screws gradually in a diagonal sequence. Rotate the bearing during tightening and monitor any change in starting or running torque.
The 5.3 kg bearing should be supported evenly during handling. Avoid impact and do not lift the bearing by only one section of the split outer ring.
Thermal Expansion and Housing Materials
Large rotary platforms are often built with aluminum structures to reduce moving mass. Aluminum expands more than bearing steel as temperature rises.
This difference may alter the mounting fit or effective preload. The design review should consider housing material, operating temperature and heat sources.
For medical, optical or semiconductor systems, include heat generated by motors, lighting, scanners and nearby electronics.
The bearing condition should be checked after the machine reaches thermal equilibrium, not only during room-temperature assembly.
Lubrication, Cleanliness and External Sealing
The standard SX011848 is open and does not contain integral seals. External seals or a protected enclosure are required where contamination may reach the raceways.
Select grease according to speed, load, oscillation, temperature and required service life. Avoid excessive grease because it can increase torque and heat.
Cleanroom and medical applications may require low-particle grease, controlled cleaning, compatible materials and special packaging. These requirements must be stated before production.
Outdoor positioning systems may require enhanced moisture sealing and corrosion protection.
LYDL Manufacturing and Quality Control
LYDL can manufacture SX011848 bearings using GCr15 or GCr15SiMn bearing steel. Accuracy, preload, clearance, lubricant and product 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 inspection
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 requirements and acceptance limits should be confirmed 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, protective wrapping, shock-resistant material and reinforced export packaging can be supplied.
Additional moisture protection should be requested for sea freight or long-term storage. Use real inspection and packaging photographs. The bearing marking, individual box label and export-package information should consistently display SX011848.
These sources provide general engineering and comparison information. Final SX011848 selection should be based on the confirmed LYDL specification, customer operating conditions and approved drawing.
Information Required for an Accurate Quotation
Please provide:
Required quantity
Complete bearing designation and suffix
Required accuracy class
Clearance or preload requirement
Radial and axial loads
Tilting moment or payload offset
Maximum speed
Oscillation angle and cycle
Operating temperature
Housing and shaft materials
Cleanliness requirements
Lubrication and external sealing
Inspection-document requirements
Delivery destination and required date
Frequently Asked Questions
1. What is the main benefit of the 240 mm aperture?
The large opening provides space for scanner components, optical paths, hollow shafts, cable groups or rotary service connections without requiring an excessively large axial assembly.
2. Can SX011848 be used in cleanroom equipment?
Yes, if the lubricant, cleaning, assembly and packaging requirements are specified appropriately. A standard open SX011848 is not automatically cleanroom-ready.
3. How should a large off-center inspection fixture be evaluated?
Calculate the fixture weight, payload, acceleration and center-of-gravity offset. The resulting tilting moment must be evaluated together with radial and axial loads.
4. Why is platform rigidity important for a large-aperture bearing?
A flexible platform or flange can deform under load and reduce positioning accuracy. Bearing capacity alone does not prevent structural deflection.
5. Is there a universal maximum speed for SX011848?
No. Permissible speed depends on preload, lubricant, load, mounting accuracy, operating temperature and required service life.
6. Can SX011848 be mounted in an aluminum frame?
Yes, but flange stiffness and differential thermal expansion must be evaluated. Temperature changes can alter the bearing fit and effective preload.
7. Does a coated original bearing require a coated replacement?
Usually, the coating requirement should be retained unless the operating environment has been reassessed. The complete suffix and corrosion conditions must be reviewed.
8. Which inspection records are useful for a medical imaging platform?
Common requirements include dimensional inspection, radial and axial runout, rotational torque, preload condition, material certification and individual traceability.
Request an SX011848 Quotation
Send LYDL your complete SX011848 designation, quantity, accuracy, preload or clearance, application loads and environmental requirements.
You can contact LYDL for SX011848 pricing and technical support to request drawings, inspection documents, customized lubrication and export-delivery information.
Combine four realistic application scenes with concise English labels:
Use real inspection and packaging photographs. The bearing marking, individual box label and export-package information should consistently display SX011848.