The XV70 crossed roller bearing is a sealed, grease-lubricated precision bearing designed for compact rotary systems requiring a 70 mm bore, high moment rigidity and direct outer-ring mounting.
Dimensions: 70 mm bore × 120 mm outside diameter × 17 mm overall width
Mounting interface: 16 counterbored fixing holes on a 105 mm pitch circle
Ring structure: Solid outer ring with a circumferentially split inner ring
Load capability: Supports radial, axial and overturning-moment loads
Basic dynamic ratings: 23.6 kN axial and 15.1 kN radial
Basic static ratings: 70 kN axial and 28 kN radial
Standard configuration: Sealed on both sides, grease lubricated, approximately 0.84 kg
Clearance options: Standard clearance, reduced clearance or preload, subject to confirmation
Within the standard XV range, XV70 is the largest model that retains a 17 mm overall width. It combines a 70 mm central opening with a 120 mm outside diameter, making it suitable for robot axes, rotary positioners, inspection equipment and compact machine assemblies.
The solid outer ring can be mounted directly to the adjacent structure, while the split inner ring allows the internal clearance or preload to be adjusted through an appropriate precision locknut arrangement.
XV70 Crossed Roller Bearing
The XV70 crossed roller bearing has a 70 mm bore, 120 mm outside diameter and 17 mm overall width. Its 16 counterbored outer-ring fixing holes are arranged on a 105 mm pitch circle, allowing the solid outer ring to be mounted directly to a rigid adjacent structure.
The circumferentially split inner ring is designed for clearance or preload adjustment 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.
Compared with smaller XV sizes, the XV70 provides more central routing space while retaining a slim 17 mm axial envelope. It is particularly suitable for medium-size robot axes, rotary positioners, precision inspection systems and compact gearbox output supports.
Additional sizes can be viewed in the XV Series Cross Roller Bearings product range.
The listed ratings are catalogue-reference basic load ratings, not maximum allowable application loads. Final selection must consider the combined load spectrum, overturning moment, speed, duty cycle, mounting rigidity, lubrication, temperature and required operating life.
Why XV70 Is Distinctive Within the XV Range
XV70 is the largest standard XV model that retains a 17 mm overall width. The next size, XV80, increases the width to 19 mm and requires a larger 135 mm outside diameter.
This makes the XV70 crossed roller bearing useful when a design needs a 70 mm central opening but cannot accommodate the additional axial and radial space required by XV80.
Although XV60 and XV70 share the same overall width and number of fixing holes, their outside diameters, pitch circles, shoulder dimensions and mounting interfaces are different. They should not be treated as drop-in replacements.
70 mm Hollow-Axis Integration
The 70 mm central opening provides space for a hollow shaft or internal services such as electrical cables, pneumatic tubing, sensor wiring and optical components.
Actual usable routing space will be smaller than the nominal 70 mm bore after accounting for the shaft, precision locknut, retaining features and assembly clearances. Cable-routing feasibility should therefore be checked against the complete shaft and locking arrangement rather than the bearing bore alone.
For robot and automation axes, the hollow center can help reduce external cable loops and simplify service routing. The bearing still requires a sufficiently rigid shaft and surrounding structure to maintain alignment under combined loads.
105 mm PCD and 16-Hole Mounting Interface
The solid outer ring includes 16 counterbored fixing holes positioned on a 105 mm pitch circle. This direct-mounting arrangement can reduce the need for a separate outer-ring clamping flange.
To obtain stable running accuracy:
Machine the supporting surface flat and perpendicular to the axis.
Verify the 105 mm pitch circle and hole positions before assembly.
Support the outer ring continuously around its mounting face.
Use the specified bolt grade and tightening torque for the application.
Tighten the bolts gradually in a diagonal sequence.
Confirm rotational torque and runout after final tightening.
The fixing holes do not compensate for a flexible housing or an uneven mounting surface. The surrounding structure must be designed to resist deformation under radial, axial and moment loads.
XV70 Compared with RB7013
Both bearings have a nominal 70 mm bore, but their dimensions, ring structures and mounting methods are substantially different.
Adjustable through split inner ring and locknut arrangement
Defined by bearing specification and mounting arrangement
Main integration priority
Direct outer-ring mounting and adjustable inner-ring setting
Smaller outside diameter and thinner axial section
The RB7013 Cross Roller Bearing may be considered when a 100 mm outside diameter and 13 mm width are more important than direct outer-ring mounting. XV70 may be preferred when the assembly benefits from its 16-hole outer-ring interface and adjustable split inner ring.
The two products are not interchangeable. Shaft geometry, housing diameter, ring retention, preload method and surrounding structure must be redesigned or verified before changing series. Other configurations are available in the LYDL Cross Roller Bearing Product Range.
Typical XV70 Applications
The XV70 crossed roller bearing is intended for precision rotary assemblies requiring a relatively large central opening, compact width and resistance to overturning moments.
Application
XV70 Integration Benefit
Important Validation Point
Medium robot joints
70 mm bore for hollow-axis routing
Emergency-stop moment and reversing duty
Robot positioners
Combined-load and moment support
Workpiece offset and cycle spectrum
Gearbox output axes
Direct outer-ring mounting
Gear mesh forces and output-shaft rigidity
Precision inspection stages
Stable angular positioning
Running torque and runout requirement
CNC auxiliary rotary axes
Compact 17 mm bearing width
Cutting-force moment and housing stiffness
Optical or sensor platforms
Large central optical or cable path
Low-speed torque variation
Automated assembly equipment
Compact combined-load support
Shock load and cycle frequency
Medical equipment mechanisms
Sealed, space-efficient arrangement
Lubricant and environmental requirements
Need an XV70 Application Review?
For an initial selection review, provide the radial load, axial load, overturning moment, operating speed, duty cycle and mounting arrangement. The LYDL Engineering and Sales Team can review the required configuration before quotation or prototype production.
Load, Moment and Speed Considerations
The XV70 supports radial, axial and overturning-moment loads simultaneously, but each load component must be evaluated as part of the complete operating cycle.
For a cantilevered load, the basic applied moment can be estimated as: M = F × L Where:
M is the applied overturning moment
F is the applied force
L is the perpendicular distance from the bearing center to the load
This simple relationship does not include acceleration, emergency stopping, vibration, impact or structural deformation. A realistic design calculation should apply suitable dynamic and safety factors.
The catalogue-reference limiting speeds are 455 rpm with preload and 910 rpm with clearance. These values are not guaranteed continuous operating speeds. Actual permissible speed may be lower depending on preload, lubrication, heat dissipation, mounting accuracy, duty cycle and external load.
For frequently reversing axes, stable running torque and temperature can be more important than maximum speed.
Clearance, Preload and Suffix Guidance
The split inner ring allows the internal condition to be selected or adjusted according to the required rigidity and running torque.
Common catalogue references include:
Standard clearance: Appropriate where low friction and simpler adjustment are priorities
RL0: Reduced-clearance reference
VSP: Preloaded-bearing reference
RR: Corrosion-resistant catalogue reference
Suffix meanings can vary between manufacturers and product generations. A suffix should not be used as the sole basis for substitution. Always confirm the drawing, internal clearance or preload, sealing, lubrication, rotational accuracy and inspection requirements.
Higher preload can improve rigidity, but it may also increase starting torque, running torque and operating temperature. The correct setting depends on the surrounding structure and operating cycle.
Manufacturing and Inspection Control
Depending on the approved specification, XV70 production and inspection may include:
Bore, outside diameter and width measurement
Fixing-hole diameter and counterbore inspection
105 mm pitch-circle position verification
Raceway geometry and roundness inspection
Surface roughness inspection
Hardness verification
Radial and axial runout inspection
Internal clearance or preload verification
Starting and running torque measurement
Seal, lubrication and appearance inspection
Final cleaning and packaging inspection
For applications sensitive to angular error, the inspection method should be agreed before production. A coordinate measuring machine or calibrated fixture may be used to verify the fixing-hole pitch circle and position accuracy.
Specified accuracy classes, inspection limits and report formats are subject to confirmation through the approved drawing or technical agreement.
Installation Recommendations
Correct mounting is necessary to achieve the intended rigidity and operating life.
Keep the bearing in its original packaging until the assembly area is ready.
Clean the shaft, locknut, support surfaces and fixing holes.
Confirm that the mounting dimensions match the approved XV70 drawing.
Do not apply hammer blows or transmit installation force through the rollers.
Seat the solid outer ring evenly against the supporting surface.
Install and adjust the split inner ring using the specified locknut procedure.
Tighten outer-ring bolts gradually in a diagonal pattern.
Rotate the assembly during staged tightening and monitor resistance.
Check final runout, starting torque, running torque and noise.
Protect the seals from sharp edges, solvents and contamination.
Fit, bolt torque and locknut adjustment depend on the shaft, housing material, load and required preload. They should not be selected from the boundary dimensions alone.
Lubrication and Operating Environment
The standard catalogue configuration is sealed on both sides and grease lubricated. Grease selection and fill quantity should reflect the operating speed, temperature, torque requirement, contamination level and maintenance interval.
The catalogue reference temperature range is −30°C to +80°C. This does not guarantee that every grease, seal or adjacent component is suitable throughout that range.
Cleanroom operation, vacuum exposure, unusually low torque, low temperature, washdown conditions or corrosive environments require separate technical confirmation.
Packaging and OEM Supply
XV70 bearings can be supplied with individual protective packaging, model labels, batch identification and export cartons according to the confirmed order.
Available project support may include:
Standard or customized production
Clearance or preload control
Application-specific lubrication
Inspection reports
Customer part-number labels
OEM marking and packaging
Prototype and production quantities
Export packing and shipping documentation
Final marking, tolerance, preload and packaging requirements should be included in the purchase specification.
XV70 Frequently Asked Questions
Why is XV70 notable within the 17 mm-width XV group?
XV70 is the largest standard XV model that retains a 17 mm overall width. It increases the bore to 70 mm and the outside diameter to 120 mm without moving to the 19 mm width used by XV80.
Can the 70 mm bore carry cables or pneumatic lines through a robot axis?
It can provide routing space, but the full 70 mm diameter is not normally available. The shaft wall, locknut and retaining components reduce the usable opening. The complete hollow-shaft assembly must be checked.
Does XV70 use the same mounting interface as XV60?
No. XV70 uses a 120 mm outside diameter and 105 mm fixing-hole pitch circle, while XV60 uses a 110 mm outside diameter and 95 mm pitch circle. Their supporting diameters also differ.
How should a cantilevered tool load be evaluated?
Begin with the applied moment relationship M = F × L, then include acceleration, emergency stopping, vibration, shock and duty-cycle factors. Bearing life and mounting deformation should be evaluated separately.
When should XV80 be considered instead of XV70?
XV80 may be appropriate when an 80 mm bore or substantially higher load ratings are required and the assembly can accommodate its 135 mm outside diameter and 19 mm width.
Can XV70 directly replace RB7013?
No. Although both have a 70 mm bore, XV70 is 70 × 120 × 17 mm with a solid, bolt-mounted outer ring and split inner ring. RB7013 is 70 × 100 × 13 mm with an integrated inner ring and split outer ring.
Should RL0 or VSP be used for a frequently reversing axis?
The choice depends on required rigidity, positioning repeatability, running torque and temperature. Reduced clearance or preload can improve rigidity, but excessive preload can increase friction and heat.
How should the 105 mm fixing-hole pitch circle be inspected?
For precision assemblies, the pitch-circle diameter and individual hole positions can be verified with a coordinate measuring machine or a calibrated inspection fixture. The acceptance method should be stated on the approved drawing.
How should spare XV70 bearings be stored?
Keep each bearing sealed in its original dry packaging, away from condensation, vibration and corrosive materials. Do not place loads on unpacked bearings or allow contamination to enter the seal area.
Does the 455 rpm preloaded speed mean XV70 can run continuously at 455 rpm?
No. It is a catalogue-reference limiting speed, not a recommended continuous operating speed. Load, preload, grease, heat dissipation, mounting accuracy and duty cycle may require a lower operating speed.
Why Choose LYDL for XV70 Bearings?
LYDL supports precision crossed roller bearing projects for robotics, machine tools, automation equipment, inspection systems and specialized rotary mechanisms.
Customers can request:
Drawing and mounting-interface review
Clearance or preload configuration
Rotational accuracy and torque inspection
Lubrication selection
Prototype and batch production
Customer-specific marking and packaging
Dimensional and inspection documentation
International export support
All final dimensions, tolerances, load requirements, suffixes and acceptance criteria are confirmed through the approved drawing, quotation or technical agreement.
Request an XV70 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.
