SX011818 is a compact precision crossed roller bearing with a 90 mm bore, 115 mm outside diameter and 13 mm width. It corresponds to LRC 9013 in the LYDL range and has an approximate mass of 0.4 kg.
The bearing uses an integrated inner ring and a circumferentially split outer ring. Cylindrical rollers arranged alternately at 90 degrees enable one compact bearing to support radial load, bidirectional axial load and overturning moment simultaneously.
SX011818 provides a balanced option between SX011814 and SX011820. It offers a larger central opening and higher load ratings than SX011814 while remaining smaller and lighter than SX011820.
Typical applications include compact servo rotary axes, automated inspection tables, semiconductor handling modules, robotic end effectors and medical positioning equipment. LYDL can supply different accuracy grades, controlled clearance, preload, selected grease, customized marking, inspection records and export packaging.
SX011818 Crossed Roller Bearing Overview
The SX011818 crossed roller bearing is a compact precision bearing with a 90 mm bore, 115 mm outside diameter and 13 mm width. LYDL supplies this size as LRC 9013, with an approximate mass of 0.4 kg.
Its 90 mm central bore provides useful space for a hollow shaft, encoder, cable route or pneumatic passage. At the same time, the 115 mm outside diameter keeps the complete rotary module compact.
SX011818 combines an integrated inner ring with a circumferentially split outer ring. Cylindrical rollers arranged alternately at 90 degrees allow one bearing to support radial load, bidirectional axial load and overturning moment.
For the complete dimensional range, visit the LYDL SX Cross Roller Bearing Series page.
These are LYDL reference values for LRC 9013/SX011818. The approved quotation, drawing and inspection agreement govern the product supplied for a specific order.
Why Choose the 90 mm SX011818 Size?
Useful Through-Bore Without a Large Housing
The 90 mm bore is large enough for many hollow shafts, encoder assemblies and service routes. Designers should still account for shaft shoulders and clamping components when calculating the final usable passage.
Balanced Size and Load Capacity
SX011818 sits between SX011814 and SX011820 in the standard LYDL size sequence. It provides substantially higher reference ratings than SX011814 while remaining smaller and lighter than SX011820.
Integrated Inner Ring for Rotary Accuracy
The solid inner ring provides a continuous rotating surface and avoids an inner-ring split line. This structure is useful when the shaft or inner ring is the primary precision rotating member.
Combined-Load Support in One Bearing
The crossed rollers distribute force through alternating contact directions. One compact bearing can therefore replace a more complex arrangement of separate radial and thrust bearings in suitable applications.
For an explanation of radial, axial and moment loads, see the LYDL Cross Roller Bearing Guide.
Main Applications of SX011818
Encoder and Direct-Drive Rotary Modules
The 90 mm bore can accommodate a hollow shaft, encoder components or cable routing. A preloaded configuration may improve rigidity and repeatability, but the permitted motor torque and operating temperature must be checked.
Vision Inspection and Calibration Tables
Camera, lighting or test fixtures often create an offset load above the rotation plane. SX011818 supports the resulting moment while preserving a relatively small 115 mm outside diameter.
Compact Machine-Axis and Test Equipment
Small indexing fixtures, tool inspection units and component test stands require stable rotation under mixed loads. The bearing can simplify the support arrangement when speed is moderate and rigidity is more important than high RPM.
Semiconductor and Laboratory Handling Systems
Wafer-handling modules, sample rotators and analytical instruments benefit from the large central passage and compact outer envelope. Grease, cleanliness, corrosion protection and torque should be specified for the actual environment.
Load Ratings and Engineering Selection
The LYDL reference ratings are Ca 26 kN, C0a 96 kN, Cr 17 kN and C0r 47 kN. Each rating applies to a defined load direction and calculation condition.
Do not add the four ratings together or treat them as simultaneous permissible loads. Combined radial, axial and moment forces require an equivalent-load and static-safety assessment.
Slow oscillation, repeated indexing and stationary loading may be governed by contact deformation rather than fatigue life. Applications with a belt, gear or cantilevered fixture must include the moment created by the load distance from the bearing centre.
Load data from another brand, suffix or catalogue generation must not replace the LYDL values without review. Internal geometry, preload and calculation conventions can differ even when boundary dimensions match.
Choose SX011818 when a 90 mm bore is sufficient and a 115 mm outside diameter offers a better fit than the larger SX011820. It also offers more load capacity and through-bore space than SX011814.
SX011820 remains preferable when the application requires a 100 mm shaft or its additional load margin. Selection must still consider moment arm, mounting stiffness, accuracy and operating cycle.
Clearance, Preload and Suffixes
Suffix definitions are not universal. The complete designation must be checked before manufacture or replacement.
No suffix: usually indicates a standard-clearance configuration, subject to confirmation.
RL0: commonly refers to reduced internal clearance.
VSP: commonly identifies a preloaded bearing.
RR: a Schaeffler/INA-specific reference associated with its corrosion-resistant treatment.
A: may indicate a revised manufacturer design or catalogue generation.
P5, P4 or P2: LYDL accuracy requirements that should be stated separately.
Preload can reduce internal movement and improve angular rigidity. Excessive preload can raise starting torque, heat and drive requirements.
For encoder or direct-drive applications, state the acceptable starting torque and running torque. Do not specify preload only by using a suffix copied from another brand.
Replacement and Interchangeability Checks
The 90 × 115 × 13 mm dimensions are only the first replacement check. Confirm the following before approving an alternative:
complete model and suffix;
shaft and housing shoulder dimensions;
corner radii and seating depth;
clearance, preload and rotational torque;
radial and axial running accuracy;
lubricant and operating environment;
outer-ring clamping arrangement;
load ratings and inspection requirements.
LYDL is not affiliated with Schaeffler, INA, THK, IKO or HIWIN. References to these brands are used only to identify industry terminology and technical requirements.
Mounting Guidance for SX011818
The split outer ring must be supported and clamped uniformly by the surrounding structure. Transport retaining rings or ties only hold the ring sections together during handling and do not support operating loads.
Clean the shaft, housing, clamping rings and assembly area.
Verify mounting-face flatness and shoulder perpendicularity.
Confirm that corner radii do not interfere with the bearing faces.
Tighten clamping screws gradually in a diagonal sequence.
Rotate the bearing during staged tightening.
Monitor torque instead of forcing a tight bearing to turn.
Check radial runout and axial runout after assembly.
Provide external protection against dust and moisture.
Periodic torque at the same angular position can indicate uneven seating, housing distortion or contamination. Recheck the mounting surfaces before assuming that the bearing itself is defective.
Lubrication and Operating Conditions
The standard SX011818 design is open, so the surrounding mechanism must provide environmental protection. Grease selection depends on speed, oscillation angle, temperature, cleanliness and required torque.
High-speed operation should not be approved from boundary dimensions alone. Clearance, preload and lubrication can materially change the permissible speed and heat generation.
Clean-room, low-temperature, high-temperature or low-outgassing applications require a separately approved lubricant. State the environment and relubrication access when requesting a quotation.
Manufacturing and Quality Control at LYDL
LYDL controls key processes including raw-material inspection, precision turning, heat treatment, cryogenic stabilization, V-raceway form grinding and raceway superfinishing. Rollers are measured and optically sorted before assembly.
Components for controlled-clearance or preloaded bearings can be micro-sorted. Deep cleaning, demagnetization and clean assembly help reduce contamination-related torque variation.
Inspection can cover dimensions, ring accuracy, radial and axial running accuracy, clearance or preload, rotational torque and final appearance. The required limits should be agreed before production.
Available options include P5, P4 and P2 accuracy, selected grease, controlled preload, customized marking, serial traceability, corrosion protection and OEM packaging.
Inspection Documents and Export Packaging
Depending on the order, LYDL can provide dimensional reports, runout results, hardness reports, material certificates, clearance or torque records and final inspection documents.
Standard export protection can include anti-rust treatment, protective wrapping, an individual carton, shock-resistant cushioning and an export plywood case. Labels, inspection records and photographs should show SX011818 rather than another SX model.
Technical References and Source Notes
Technical terminology and general engineering principles used on this page were checked against the following sources:
These sources provide general engineering context only. They do not make brand-specific load ratings, coatings or suffixes interchangeable.
Information Required for an SX011818 Quotation
Provide the quantity, complete designation, application loads, moment arm, speed, duty cycle and rotating ring. Also state the accuracy grade, clearance or preload, permitted torque, lubricant, environment and required inspection documents.
For replacement projects, include a photograph of the existing label and an installation drawing. This reduces the risk of selecting a dimensionally similar but functionally different bearing.
Frequently Asked Questions
Why choose SX011818 instead of SX011814?
SX011818 provides a larger 90 mm bore and higher LYDL reference load ratings. It is better suited to mechanisms that need additional through-bore space or load margin but do not require SX011820 dimensions.
Can the 90 mm bore carry cables through a hollow shaft?
Yes, but the complete usable passage depends on the shaft wall, shoulders, encoder and clamping components. Check the assembled cross-section rather than using the bearing bore alone.
Is SX011818 suitable for a belt-driven rotary axis?
It can be suitable when the radial belt force and resulting moment are within the engineered limits. Provide belt tension, pulley diameter, offset distance, speed and duty cycle for review.
Should an encoder application use standard clearance or preload?
Preload can improve rigidity and repeatability, while standard clearance may reduce torque. The correct choice depends on encoder resolution, drive torque, temperature and acceptable runout.
Why did rotational torque increase after the outer ring was clamped?
Common causes include uneven bolt tightening, incorrect seating depth, housing distortion, contaminated faces or excessive preload. Inspect the adjacent structure before operating the bearing under power.
Can SX011818 replace INA SX011818-A, RL0 or VSP?
Only after the complete suffix, clearance or preload, accuracy, load data, shoulders, lubrication and mounting arrangement are confirmed. The basic 90 × 115 × 13 mm dimensions are insufficient.
Is SX011818 supplied with seals?
The standard LYDL LRC 9013/SX011818 configuration is open. The surrounding design should provide dust and moisture protection, or a customized protection option should be discussed.
Which inspection results are most useful for a vision table?
Radial and axial runout, rotational torque, clearance or preload, dimensional accuracy and serial traceability are useful. The customer should define acceptable limits before production.
Request a Quote for SX011818
LYDL supplies standard and customized SX011818 crossed roller bearings for encoder modules, inspection stages, compact rotary axes and precision automation. Contact LYDL with your loads, speed, accuracy, torque and preload requirements to receive a technical review and quotation.
