The XV90 crossed roller bearing is a sealed, grease-lubricated precision bearing with a large 90 mm bore, a compact 19 mm overall width and a directly mountable solid outer ring.
Dimensions: 90 mm bore × 145 mm outside diameter × 19 mm overall width
Mounting interface: 16 counterbored fixing holes on a 130 mm pitch circle
Fixing-hole dimensions: 6.6 mm through-hole, 11 mm counterbore and 6.4 mm counterbore depth
Ring structure: Solid outer ring with a circumferentially split inner ring
Load capability: Supports radial, axial and overturning-moment loads
Basic dynamic ratings: 35 kN axial and 22.3 kN radial
Basic static ratings: 111 kN axial and 44.5 kN radial
Standard configuration: Sealed on both sides, grease lubricated, approximately 1.29 kg
Reference limiting speeds: 364 rpm with preload and 728 rpm with clearance
XV90 is the largest standard XV model that retains a 19 mm overall width. Compared with XV80, it increases the bore from 80 mm to 90 mm while maintaining the same width and fixing-hole dimensions.
This balance makes XV90 suitable for hollow-axis robot joints, compact direct-drive systems, gearbox outputs, rotary positioners and precision equipment requiring additional central installation space without moving to the substantially larger XV100 envelope.
XV90 Crossed Roller Bearing Overview
The XV90 crossed roller bearing measures 90 × 145 × 19 mm and combines a large central opening with a relatively slim axial profile. Its solid outer ring has 16 counterbored fixing holes arranged on a 130 mm pitch circle, enabling direct mounting to a rigid adjacent structure.
The circumferentially split inner ring allows the internal clearance or preload to be adjusted through a suitable precision locknut arrangement. Crossed cylindrical rollers support radial loads, axial loads in both directions and overturning moments within one compact bearing position.
XV90 is the largest standard model in the XV range that retains a 19 mm overall width. Its main advantage over XV80 is the additional 10 mm of bore diameter rather than a dramatic increase in load capacity.
This makes it a practical choice for designs that need more space for a hollow shaft, torque-motor components, cables or pneumatic services but cannot accommodate the 170 mm outside diameter and 23 mm width of XV100.
Additional sizes are available in the XV Series Cross Roller Bearings range.
The listed values are catalogue-reference dimensions, ratings and limiting speeds. They are not maximum permissible application loads or guaranteed continuous operating speeds.
Final selection must consider the complete load spectrum, applied moment, acceleration, speed, duty cycle, mounting stiffness, preload, lubrication, temperature and required operating life.
The Largest 19 mm-Width XV Model
XV80 and XV90 share the same 19 mm overall width, 16-hole arrangement and fixing-hole dimensions. XV100 moves to a substantially larger 23 mm overall width and 170 mm outside diameter.
XV90 therefore occupies a distinct position in the series: it provides the largest bore available before the bearing envelope and load capacity increase significantly at XV100.
These values show that the main reason to choose XV90 over XV80 is usually the larger central opening and installation envelope, not a major increase in rated load.
Compact Radial Installation Envelope
XV90 has a nominal radial envelope of: (145 mm outside diameter − 90 mm bore) ÷ 2 = 27.5 mm This figure is useful during preliminary layout work, but it is not the physical ring-wall thickness. The internal raceways, seals, mounting diameters and fixing holes occupy part of this envelope.
The 27.5 mm radial envelope allows the bearing to combine:
A 90 mm central opening
Crossed roller raceways
Two-sided sealing
A 130 mm fixing-hole pitch circle
Sixteen counterbored mounting positions
The surrounding structure must provide adequate material around the bearing mounting face and threaded holes. CAD clearance should be checked using the confirmed product drawing.
Solid Outer Ring and Split Inner Ring
The XV90 crossed roller bearing uses a solid outer ring that can be fastened directly to the machine structure. This can eliminate a separate outer-ring clamping flange and reduce the number of assembly components.
The inner ring is circumferentially split. A suitable precision locknut arrangement is used to retain the inner ring and establish the required clearance or preload.
This structure can provide:
Direct and evenly distributed outer-ring fastening
Adjustable internal setting
Compact axial integration
Combined radial, axial and moment-load support
Simplified surrounding construction
Correct adjustment is essential. Excessive preload can increase rotational resistance and heat, while insufficient preload can reduce rigidity and positioning consistency.
For additional information about structural differences between bearing series, see the Cross Roller Bearings Design and Selection Guide.
130 mm Fixing-Hole Pitch Circle
The solid outer ring has 16 equally distributed counterbored holes on a 130 mm pitch circle.
Each fixing position includes:
6.6 mm through-hole
11 mm counterbore
6.4 mm counterbore depth
The mounting structure should provide continuous and rigid support beneath the outer-ring face. Insufficient support can allow local deformation around the fixing holes and affect running accuracy.
Recommended mounting checks include:
Verify the 130 mm pitch circle and angular spacing.
Confirm the counterbore orientation before assembly.
Check supporting-face flatness and perpendicularity.
Verify thread depth and screw engagement.
Tighten bolts gradually in a diagonal sequence.
Rotate the bearing during staged tightening.
Measure running torque and runout after final assembly.
Bolt grade, engagement length and tightening torque must be determined from the actual load and mounting materials. They should not be selected from the hole diameter alone.
XV90 Compared with RE9016
XV90 and RE9016 both have a nominal 90 mm bore and use a split-inner-ring concept, but their boundary dimensions and outer-ring mounting arrangements are different.
Normally supported and retained by a housing or flange
Fixing-hole PCD
130 mm
Not applicable in the same configuration
Primary advantage
Direct mounting and larger load-carrying section
Smaller outside diameter and axial width
The RE Series Cross Roller Bearings may be considered when a 130 mm outside diameter and 16 mm width are more important than direct outer-ring screw mounting.
XV90 may be preferred when the surrounding structure is designed around its 16-hole mounting interface and adjustable inner-ring arrangement.
The two models are not direct replacements. Boundary dimensions, shoulder geometry, ring retention, accuracy, preload and load ratings must be checked independently.
Typical XV90 Applications
The XV90 crossed roller bearing is designed for precision rotary systems that require a large central opening, compact width and resistance to combined loads.
Application
XV90 Design Benefit
Main Validation Requirement
Hollow-axis robot joints
90 mm bore with compact 19 mm width
Cable package and shaft strength
Direct-drive rotary axes
Space for motor or encoder components
Magnetic forces and heat transfer
Robot positioners
Direct outer-ring fastening
Payload moment and mounting stiffness
Gearbox output supports
Combined-load capability
Gear force and shaft alignment
CNC auxiliary axes
Compact precision support
Cutting load and runout
Laser processing systems
Large optical or service passage
Thermal stability and angular accuracy
Precision inspection stages
Controlled rigidity and rotation
Torque variation and measurement error
Semiconductor machinery
Sealed compact arrangement
Lubricant and cleanliness requirements
Medical equipment mechanisms
Large central installation space
Environmental and material requirements
Automated assembly systems
Moment support and direct mounting
Reversing cycle and shock spectrum
Need an XV90 Application Review?
Provide the operating loads, applied moment, speed, duty cycle and shaft arrangement before confirming the bearing configuration. The LYDL Engineering and Sales Team can review the mounting, clearance, preload and inspection requirements.
Direct-Drive Motor and Encoder Integration
The 90 mm bore can provide useful installation space for torque-motor components, encoders, slip rings, rotary unions or internal service routing.
The bearing should not be selected only by checking whether these components fit through the nominal bore. The complete arrangement must account for:
Shaft or rotor-carrier wall thickness
Precision locknut dimensions
Encoder mounting surfaces
Cable bend radius
Rotary-union dimensions
Thermal expansion of motor components
Magnetic forces
Required service access
Motor heat can alter shaft and housing dimensions, changing the effective bearing preload. Thermal paths and operating temperature should be considered during the initial design stage.
Encoder performance may also be affected by bearing runout, mounting-face error and elastic deformation under moment load.
Load and Moment Evaluation
The crossed roller arrangement enables simultaneous support of radial, axial and overturning-moment loads.
For an external force acting at a distance from the bearing center, the preliminary applied moment can be estimated using: M = F × L Where:
M is the applied overturning moment
F is the external force
L is the perpendicular distance from the bearing center
The complete evaluation should also include:
Static payload
Acceleration and deceleration
Emergency stopping
Tool or workpiece offset
Gear or belt forces
Vibration and impact
Operating cycle
Required safety factor
Mounting-structure deformation
Fixing-screw capacity
The bearing, locknut, fixing screws, shaft and supporting structure form one load path and should be evaluated together.
Speed and Operating Temperature
The catalogue-reference limiting speeds are:
364 rpm with preload
728 rpm with clearance
These values do not represent guaranteed continuous operating speeds. Actual permissible speed may be lower depending on load, preload, lubrication, seal friction, heat dissipation and duty cycle.
XV90 is principally intended for precision rotary motion rather than high-speed spindle operation. In many robot, positioning and inspection applications, the following factors are more important than maximum speed:
Stable running torque
Low temperature rise
Consistent positioning
Controlled runout
Reliable reversing performance
Long grease life
A low-speed trial should be completed after installation before progressing to the normal operating cycle.
Clearance, Preload and Ordering Suffixes
The required internal setting depends on application rigidity, positioning accuracy, starting torque, running torque and thermal conditions.
Common catalogue references include:
Standard clearance: Prioritizes lower friction
RL0: Reduced-clearance catalogue reference
VSP: Preloaded-bearing catalogue reference
RR: Corrosion-resistant catalogue reference
Suffix definitions can vary between manufacturers. Model numbers or suffixes should not be treated as confirmation of complete interchangeability.
Before ordering, confirm:
Internal clearance or preload
Dimensional tolerances
Rotational accuracy
Starting and running torque
Sealing arrangement
Grease specification
Operating temperature
Inspection method
Marking and packaging requirements
The approved LYDL drawing and technical agreement determine the final supply specification.
Manufacturing and Inspection Control
Depending on the confirmed XV90 specification, manufacturing and inspection may include:
Raw-material and forging verification
Precision turning
Heat treatment and stabilization
Raceway form grinding
Raceway superfinishing
Bore and outside-diameter inspection
Inner-ring and outer-ring width inspection
Raceway roundness and geometry measurement
Fixing-hole diameter inspection
Counterbore depth inspection
130 mm pitch-circle position measurement
Roller sorting and matching
Radial and axial runout inspection
Clearance or preload verification
Starting and running torque testing
Seal and grease inspection
Identification and packaging inspection
For critical positioning applications, inspection methods and acceptance limits should be agreed before production. The finished bearing should be evaluated according to the approved drawing rather than nominal boundary dimensions alone.
Installation Recommendations
Correct assembly is necessary to achieve stable accuracy and operating life.
Keep the bearing in its original packaging until installation.
Clean the shaft, locknut, fixing holes and mounting surfaces.
Verify all mounting dimensions against the approved drawing.
Check the supporting-face flatness and perpendicularity.
Do not strike the bearing or transmit assembly force through the rollers.
Seat the solid outer ring uniformly against its mounting surface.
Install the split inner ring using the specified locknut arrangement.
Adjust clearance or preload in controlled stages.
Tighten outer-ring bolts gradually in a diagonal pattern.
Rotate the bearing during staged tightening.
Measure final runout and rotational resistance.
Complete a controlled low-speed operating test.
If running torque changes unevenly during tightening, stop and check for mounting-face error, contamination, uneven bolt loading or excessive inner-ring adjustment.
Lubrication and Environmental Conditions
The standard catalogue configuration is sealed on both sides and grease lubricated.
Grease selection should consider:
Operating speed
Applied load
Internal preload
Temperature
Starting-torque requirement
Contamination
Maintenance interval
Compatibility with seals
Cleanliness requirements
The catalogue reference temperature range is −30°C to +80°C. Actual suitability depends on the confirmed grease, sealing materials and surrounding components.
Vacuum, cleanroom, low-temperature, low-outgassing, washdown or corrosive applications require separate technical review. A standard industrial XV90 should not automatically be assumed suitable for a special environment.
Packaging and OEM Supply
XV90 bearings can be supplied with individual protective packaging, batch identification and reinforced export cartons according to the confirmed purchase requirements.
Available project support may include:
Standard or customized production
Clearance or preload configuration
Application-specific lubrication
Dimensional inspection reports
Runout and torque records
Customer part-number marking
Serial-number traceability
OEM labels and packaging
Prototype and production quantities
Export documentation
Final tolerance, preload, marking, lubrication and packaging requirements should be included in the approved quotation or technical agreement.
XV90 Frequently Asked Questions
Why choose XV90 if its load ratings are only moderately higher than XV80?
XV90 is mainly selected when the design requires a 90 mm bore while retaining the same 19 mm width as XV80. If an 80 mm bore is sufficient, XV80 may provide a smaller and lighter solution.
Is XV90 the largest XV bearing with a 19 mm overall width?
Yes. XV80 and XV90 have a 19 mm overall width. The next standard model, XV100, increases to 23 mm wide with a 170 mm outside diameter.
Can an existing mounting plate with a 130 mm PCD be reused?
Not automatically. Hole quantity, angular position, diameter, counterbore, supporting diameter, flatness and thread engagement must all match the confirmed XV90 drawing.
Does the 27.5 mm radial envelope equal the ring-wall thickness?
No. It is only the difference between the outside and bore radii. Raceways, seals, shoulders and fixing holes are contained within that space, so it must not be used as the actual material thickness.
Is XV90 suitable for a direct-drive torque motor?
It may be suitable because the 90 mm bore provides integration space. Motor heat, magnetic force, rotor alignment, encoder accuracy and effective bearing preload must be evaluated as part of the complete assembly.
Does the 364 rpm preloaded rating mean XV90 is only suitable for slow motion?
It is primarily a precision bearing rather than a high-speed spindle bearing. The stated value is a reference limiting speed, and many robot or positioning applications operate well below it.
How can motor temperature affect the split inner ring?
Different thermal expansion of the shaft, inner ring and housing can change the effective clearance or preload. Fits, locknut adjustment and expected stabilized temperature should be evaluated together.
Can XV90 be used with a rotating outer ring?
A rotating-outer-ring arrangement may be technically possible, but centrifugal effects, mounting method, lubrication and required rotational accuracy must be reviewed. The direct outer-ring fixing structure is commonly integrated with a fixed outer support.
When should XV100 be selected instead of XV90?
XV100 should be considered when a 100 mm bore or a substantial increase in load capacity is required and the machine can accept its 170 mm outside diameter, 23 mm width and larger fixing-hole geometry.
What information should an XV90 purchase drawing specify?
It should define boundary dimensions, mounting-hole geometry, supporting diameters, tolerances, runout, clearance or preload, lubrication, sealing, inspection method and marking requirements.
Why Choose LYDL for XV90 Bearings?
LYDL manufactures precision crossed roller bearings for industrial robots, direct-drive systems, CNC equipment, inspection machinery and specialized rotary mechanisms.
Customers can request:
Drawing and mounting review
Clearance or preload configuration
Precision locknut coordination
Lubrication selection
Runout and torque inspection
Prototype and batch production
Customer-specific marking
Inspection documentation
OEM and export packaging
International delivery support
All dimensions, tolerances, suffixes, preload conditions and acceptance criteria are governed by the approved drawing, quotation and technical agreement.
Request an XV90 Quotation
For accurate selection and pricing, please provide:
HIWIN – Crossed Roller Bearing Product Information
Third-party brand names, model references and standards are included only for technical identification and general engineering reference. They do not imply affiliation, authorization, endorsement or guaranteed interchangeability. LYDL supply specifications are governed by the approved drawing, quotation and technical agreement.
