The SX011820 crossed roller bearing is a compact thin-section precision bearing with a 100 mm bore, 125 mm outside diameter and 13 mm width. Its large bore-to-outside-diameter ratio makes it suitable for rotary mechanisms that require a wide central opening while keeping the surrounding bearing structure small.
SX011820 uses an integrated inner ring and a circumferentially split outer ring. Cylindrical rollers are arranged alternately at 90 degrees between precision-ground raceways, allowing one bearing to support radial load, axial load in both directions and overturning moment simultaneously.
This bearing is primarily used in precision rotary tables, CNC indexing tables, optical inspection systems, metrology equipment, medical imaging mechanisms and compact positioning platforms. Compared with RB10016, SX011820 provides the same 100 mm bore with a smaller outside diameter and narrower section.
LYDL manufactures SX011820 using GCr15, 100Cr6 or SAE 52100-equivalent bearing steel. Standard, low-clearance and preloaded configurations can be evaluated, together with P5, P4, P2 or application-specific accuracy requirements. Custom grease, corrosion-resistant treatment, OEM marking and inspection documentation are also available according to project requirements.
SX011820 Crossed Roller Bearing Overview
The SX011820 crossed roller bearing is a compact precision bearing with a 100 mm bore, 125 mm outside diameter and 13 mm width. It is designed for rotary mechanisms that require high rigidity, accurate positioning and combined-load support within a limited radial installation space.
SX011820 uses an integrated inner ring and a circumferentially split outer ring. Cylindrical rollers are arranged alternately at 90 degrees between precision-ground raceways, allowing one bearing to support radial load, axial load from both directions and overturning moment simultaneously.
Within the LYDL product range, SX011820 corresponds to LRC 10013. Its compact 13 mm section makes it suitable for precision rotary tables, measuring instruments, optical inspection systems, semiconductor equipment and other positioning mechanisms where a conventional multi-bearing arrangement would occupy too much space.
For additional series information, visit the LYDL SX Cross Roller Bearing Series page.
The listed load ratings are LYDL reference data for LRC 10013/SX011820. Final selection should also consider load direction, overturning moment, speed, duty cycle, mounting rigidity, lubrication and required service life.
Structure and Operating Principle
Integrated Inner Ring
The one-piece inner ring provides a continuous mounting and rotating surface. It is particularly suitable for arrangements in which the shaft or inner ring is the primary rotating component.
Split Outer Ring
The outer ring is circumferentially split to permit assembly of the crossed rollers. The retaining devices or transport ties keep the ring sections together during handling; they are not intended to carry application loads.
After installation, the outer ring must be supported and clamped uniformly by the surrounding structure. Correct clamping is essential for maintaining raceway geometry, rotational accuracy and stable torque.
Crossed Cylindrical Rollers
Adjacent cylindrical rollers are positioned perpendicular to each other in a V-shaped raceway. Alternating roller orientation allows the bearing to resist loads from multiple directions while line contact between the rollers and raceways provides higher rigidity than many ball-bearing arrangements of a similar size.
This operating principle is also described in the THK Cross-Roller Ring Structure and Features technical reference.
Compact Dimension Series
SX bearings follow a compact dimensional concept associated with dimension series 18. SX011820 provides a 100 mm bore with only 13 mm of bearing width, making it useful where equipment designers need to reduce the radial and axial envelope without giving up combined-load support.
Main Applications of SX011820
Precision Rotary and Indexing Tables
SX011820 can support the axial force, radial cutting reaction and moment load generated by a compact rotary or indexing table. Its rigid roller contact helps limit angular deflection during positioning and machining operations.
Optical and Metrology Equipment
Optical inspection systems, roundness measuring machines, CMM rotary axes and calibration instruments require smooth rotation with limited displacement under off-centre loads. The compact SX011820 structure helps maintain alignment without adding a wide paired-bearing arrangement.
Semiconductor and Electronics Equipment
Wafer inspection stages, handling modules and compact automation platforms often combine strict space limits with repeatable angular positioning. A controlled-clearance or preloaded SX011820 can be specified according to the required torque, rigidity and positioning performance.
Medical and Laboratory Automation
Medical imaging mechanisms, sample-handling systems and laboratory rotary stages benefit from the bearing’s compact section and multidirectional load capability. Lubricant, cleanliness and corrosion-protection requirements should be confirmed for the actual operating environment.
Load Ratings and Data Control
The values shown on this page belong to the LYDL LRC 10013/SX011820 dataset:
Axial dynamic load rating, Ca: 28 kN
Axial static load rating, C0a: 106 kN
Radial dynamic load rating, Cr: 18 kN
Radial static load rating, C0r: 52 kN
These values must not be mixed with load ratings from another brand, catalogue generation or suffix variant. Bearings sharing the same 100 × 125 × 13 mm boundary dimensions may have different roller profiles, internal geometry, materials, preload settings and calculation bases.
Dynamic-life evaluation should use an appropriate equivalent bearing load and the actual operating cycle. Applications dominated by slow oscillation, stationary load or high overturning moment also require a static safety and raceway-contact assessment.
For a general explanation of radial, axial and moment loads, see the LYDL Cross Roller Bearing Guide.
Applicable Standards and Technical Basis
The following standards are cited as engineering references. Their inclusion does not mean that every LYDL suffix or customized configuration is independently certified under every listed standard.
Defines general bearing dimension plans. The SX family is associated with dimension series 18, but DIN 616 does not define its complete internal design or preload.
Provides terminology and limits for dimensional and geometrical bearing interfaces. Actual running accuracy must follow the confirmed LYDL drawing and inspection agreement.
Provides methods relating to static ratings, static equivalent loads and safety factors. Preload, misalignment or abnormal load distribution requires manufacturer review.
These standards are technical references rather than a declaration of automatic certification or interchangeability. The approved drawing, quotation, inspection criteria and purchase specification govern the supplied product.
Authoritative Brand References
The Schaeffler/INA Crossed Roller Bearings for High Precision Applications publication provides recognized technical background on SX construction, designation, mounting, clearance and preload.
The THK reference above independently explains the general 90-degree crossed-roller arrangement and its ability to support radial, axial and moment loads.
These links are included to clarify industry terminology. They do not indicate that LYDL is affiliated with, authorized by or commercially connected to Schaeffler, INA or THK. Brand-specific drawings, load ratings, coatings and suffixes remain the responsibility of their respective owners.
Outer ring can be mounted directly in applicable designs
Normally mounted with housing and clamping flange
Standard sealing
Open
Commonly sealed in applicable designs
Open or sealed variants
Primary advantage
Compact DIN series 18 section
Lightweight, adjustable mounting concept
Broad metric size selection
Typical use
Measuring, optical and compact rotary systems
Dynamic compact mechanisms
Robots, rotary tables and general precision equipment
SX011820 and an RB bearing can have similar ring arrangements, but the dimensional series, shoulder requirements, load ratings and clearance definitions may differ. See the LYDL RB Series Cross Roller Bearings page when comparing alternatives.
Suffixes, Clearance and Preload
Suffix meanings are not completely universal across manufacturers or catalogue generations. Common references include:
No suffix: generally indicates a standard configuration, but the actual clearance must still be confirmed.
RL0: commonly used for a reduced-clearance version.
VSP: commonly identifies a preloaded version.
RR: a Schaeffler/INA brand-specific reference associated with its corrosion-resistant treatment.
A: may identify a revised manufacturer design or catalogue generation and must not be ignored during cross-referencing.
P5, P4 or P2: LYDL accuracy requirements that should be stated separately in the order.
LYDL can control clearance, preload, rotational torque and accuracy according to the approved technical requirement. Do not select a preloaded version only because it appears more precise: excessive preload can increase torque and heat, while insufficient preload can reduce rigidity.
Installation and Lubrication Recommendations
The accuracy of an SX011820 installation depends on the bearing and its surrounding components.
Keep the shaft, housing, clamping rings and assembly area clean.
Inspect mounting-face flatness, shoulder perpendicularity and corner radii.
Do not use the outer-ring retaining devices as structural load supports.
Clamp the split outer ring evenly around its circumference.
Tighten fasteners gradually in a diagonal sequence.
Rotate the bearing during staged tightening and monitor torque changes.
Avoid impact loading or direct hammering on either ring.
Verify radial runout, axial runout and rotational resistance after assembly.
Protect the standard open bearing from dust, moisture and debris through the surrounding structure.
Lubricant selection depends on speed, temperature, oscillation angle, cleanliness and relubrication access. Special low-temperature, high-temperature, clean-room or low-outgassing lubricants must be evaluated separately.
Why Choose LYDL for SX011820?
LYDL manufactures precision crossed roller bearings in Luoyang, China. Key production and control processes include raw-material inspection, precision turning, heat treatment, cryogenic stabilization, V-raceway form grinding, raceway superfinishing, roller optical sorting, precision measurement, deep cleaning and demagnetization.
For controlled-clearance or preloaded orders, components can be micro-sorted before clean assembly. Rotational torque, clearance or preload, dimensional accuracy and running accuracy are checked according to the agreed product level.
Available customization includes:
P5, P4 and P2 accuracy requirements;
controlled clearance or preload;
specified grease and filling quantity;
corrosion-protection options;
customized marking and serial numbers;
customer-specific inspection criteria;
OEM packaging and private labelling.
Inspection, Documentation and Packaging
Depending on the order, LYDL can provide a dimensional inspection report, running-accuracy record, hardness report, material certificate, clearance or torque record and final inspection documentation.
Standard export protection can include anti-rust treatment, protective wrapping, an individual carton, shock-resistant cushioning and an export plywood case. Packaging labels should show the exact model supplied. An image or box marked SX011824 must not be presented as SX011820. [Image Position 3 – SX011820 inspection, individual package and export case]
Information Required for an SX011820 Quotation
Please provide:
complete requested designation and suffix;
order quantity;
radial, axial and overturning-moment loads;
speed, oscillation angle and duty cycle;
required accuracy grade;
clearance or preload requirement;
lubrication and operating environment;
drawing or existing bearing label;
required inspection and traceability documents.
This information helps LYDL determine whether standard SX011820 is suitable or whether a controlled-clearance, preloaded or customized version is required.
Frequently Asked Questions
What do the numbers in SX011820 represent?
The designation identifies the SX bearing type, series 01, dimension series 18 and size code 20. The size code should not be interpreted without the catalogue; the confirmed dimensions are 100 × 125 × 13 mm.
Is standard SX011820 supplied with seals?
The standard LYDL LRC 10013/SX011820 configuration is open and does not have integral seals. External sealing or a customized protection arrangement should be considered for dusty or humid environments.
Can LYDL SX011820 directly replace INA SX011820-A?
Not from the basic designation alone. Confirm the complete suffix, dimensions, shoulders, clearance or preload, running accuracy, load ratings, lubrication and mounting structure before approving replacement.
Why can SX011820 load ratings differ between brands?
Manufacturers may use different roller geometry, raceway profiles, materials, internal clearance, calculation methods or catalogue revisions. The ratings from one dataset should be used consistently rather than mixed with another brand’s values.
Which ring normally rotates in SX011820?
The integrated inner ring makes SX011820 particularly suitable for inner-ring rotation. Outer-ring rotation may also be possible, but the mounting, clamping and required running accuracy must be evaluated.
Does the split outer ring require a clamping flange?
Yes. The surrounding structure must support and clamp the outer ring uniformly. Transport retaining devices only keep the ring sections together during handling and are not intended to carry operating loads.
Can SX011820 be supplied with preload?
Yes. LYDL can provide controlled-clearance or preloaded versions according to the required rigidity, torque and accuracy. The preload target must be confirmed before production.
What should be checked when ordering a high-precision version?
Specify the accuracy grade, rotating ring, permitted runout, torque range, preload or clearance, mounting fits, lubrication and inspection documents. Writing only “P2” without defining the application and inspection requirements may be insufficient.
Request a Quote for SX011820
LYDL supplies standard and customized SX011820 crossed roller bearings for precision rotary tables, measuring systems, semiconductor equipment, optical instruments and automation machinery. Contact LYDL with your quantity, application loads, speed, accuracy and preload requirements to receive a technical review, quotation and available inspection-document options.
