The RA10008 cross roller bearing is an ultra-thin precision bearing with a 100 mm bore, 116 mm outside diameter and only 8 mm width. Its crossed cylindrical rollers support radial, axial and moment loads in one compact bearing position, helping designers reduce the size and mass of robot joints, rotary stages and inspection equipment.
The separable outer ring is intended to be secured by the surrounding housing, while the one-piece inner ring is the preferred rotating ring when running accuracy is important. LYDL supplies open and sealed RA10008 configurations, with C0 or CC0 clearance options and application-matched accuracy available after technical confirmation.
Choose the RA10008 cross roller bearing when the design requires a large through-bore, a very small radial section and stable precision motion. Send your quantity, load, speed, accuracy, sealing and lubrication requirements for a drawing review and quotation.
RA10008 Cross Roller Bearing Overview
The RA10008 cross roller bearing is a thin-section crossed roller bearing for precision rotary mechanisms where a 100 mm through-bore must fit inside a 116 mm envelope. With a width of only 8 mm, it offers an efficient solution for designs that cannot accommodate a conventional two-bearing arrangement.
Inside the bearing, cylindrical rollers are arranged alternately at 90 degrees. This geometry enables one bearing position to react to radial load, axial load in both directions and overturning moment, while the spacer-retainer construction helps maintain smooth roller movement and stable torque.
Unlike the integrated RU family, the RA10008 uses a separable outer ring and a one-piece inner ring. The outer ring therefore requires accurate, even clamping by the housing, and the inner ring is normally selected as the rotating ring when precision is a priority.
RA10008 Specifications
The principal catalogue data for the RA10008 cross roller bearing are listed below. Load ratings are radial basic ratings and should not be treated as an allowable combined-load limit without life, rigidity and mounting calculations.
Parameter
RA10008 value
Bore diameter, d
100 mm
Outside diameter, D
116 mm
Width, B
8 mm
Roller pitch circle, dp
107 mm
Lubrication-hole reference, a × b
2 × 0.8 mm
Minimum corner radius, r min
0.5 mm
Maximum shaft shoulder, ds
103.5 mm
Minimum housing shoulder, Dh
110.5 mm
Basic dynamic load rating, C
7.15 kN
Basic static load rating, C0
13.9 kN
Approximate mass
0.14 kg
Standard structure
Separable outer ring; one-piece inner ring
Standard lubrication
Grease lubrication; oil hole available
Catalogue temperature with standard grease
−15°C to +80°C
Dimensions and ratings should be verified against the approved LYDL drawing before machining mating parts. Operating life depends on the complete load spectrum, speed, lubrication, contamination, mounting accuracy and required reliability.
Why the RA10008 Is Different
A 100 mm Bore in an 8 mm-Wide Section
The RA10008 cross roller bearing leaves a large central opening for cables, optical paths, air lines or a drive shaft. Its 8 mm width is especially useful when axial installation space is more restrictive than load capacity.
Separable Outer Ring for Compact Housing Integration
The split outer ring simplifies the thin bearing geometry but transfers more responsibility to the housing. A rigid, flat clamping face and uniform fastener force are needed to prevent distortion, local clearance variation and irregular running torque.
Combined-Load Support from One Bearing Position
The crossed rollers provide line contact and react to radial, bidirectional axial and moment loads. This can simplify a compact rotary unit, although final suitability must be confirmed from equivalent load, moment arm, duty cycle and desired life.
Stable Precision Motion
Spacer retainers separate adjacent rollers, reducing roller-to-roller friction. Correct clearance, lubrication and mounting allow the RA10008 cross roller bearing to deliver repeatable motion in low-to-moderate-speed precision axes.
Typical RA10008 Cross Roller Bearing Applications
The model is a practical choice for robot wrists and end effectors, semiconductor handling modules, optical inspection stages, compact indexing tables, medical imaging mechanisms and metrology fixtures. It is most valuable where a large passage and low section height matter more than very high speed.
For additional selection guidance, see LYDL’s Cross Roller Bearing Guide and Cross Roller Bearings range.
Need a technical check before ordering? Send LYDL your required quantity, radial and axial loads, moment load, speed, duty cycle, rotating ring, accuracy, clearance or preload, temperature, lubricant, sealing environment and replacement brand. We will review the RA10008 cross roller bearing configuration and return a quotation with the controlled drawing.
Available Configurations and Suffix Guide
Suffix practices differ by manufacturer. The following descriptions are procurement guidance, not a promise that every combined suffix is a stocked standard.
Best for clean, enclosed mechanisms with external contamination control.
RA10008UU
Seals on both sides
Improves dust and grease retention; seal drag may increase torque.
C0
Standard or positive radial clearance class
Suitable where low torque is prioritized; confirm the maker’s measured range.
CC0
Controlled negative clearance or preload class
Improves rigidity but increases torque and sensitivity to mounting error.
P4 / precision grade
Higher dimensional or running accuracy
Accuracy symbols vary by brand; specify the rotating ring and inspection standard.
An LYDL RA10008 cross roller bearing can be reviewed for special grease, corrosion-resistant treatment, matched clearance or inspection reporting. Temperature capability must be reassessed when seals, lubricant or material differs from the standard configuration.
Use the RA8008 Cross Roller Bearing when a smaller shaft or passage is acceptable. Choose the RA12008 Cross Roller Bearing when the design needs a 120 mm through-bore.
If direct mounting holes or an integrated-ring construction are required, compare the RU Cross Roller Bearing series. For outer-ring rotation in a split-ring architecture, review the RE Cross Roller Bearing family rather than assuming the RA arrangement is suitable.
Installation and Housing Guidance
The RA10008 cross roller bearing should not be clamped through an uneven cover plate. Machine the shaft, housing shoulders and clamping faces with controlled roundness, coaxiality, flatness and perpendicularity. Remove burrs and protect the raceways from impact.
Use the 103.5 mm maximum shaft-shoulder diameter and 110.5 mm minimum housing-shoulder diameter as catalogue references, then confirm the final drawing. Tighten the outer-ring retainer gradually in a diagonal sequence so that clamping force remains uniform around the circumference.
After assembly, rotate the bearing slowly and check torque, noise and runout before connecting the drive. Excessive or periodic torque often indicates housing distortion, uneven clamping, contamination, incorrect fit or excessive preload rather than a defect in the RA10008 cross roller bearing itself.
Do not separate, drop or strike the rings during handling. Open versions need a clean enclosure and a validated lubrication plan. Sealed versions reduce contamination entry but do not make the unit maintenance-free in every duty cycle.
LYDL Manufacturing and Quality Control
LYDL controls ring material, heat treatment, raceway grinding, roller sorting, assembly clearance and final inspection according to the confirmed order specification. Dimensional and running-accuracy records, material certificates or customized inspection reports can be supplied when agreed before production.
For an RA10008 cross roller bearing, inspection should focus on bore and outside diameter, width, radial clearance, rotational runout, starting torque and surface condition. Packaging should immobilize the thin bearing, prevent corrosion and avoid pressure that could deform the split outer ring.
Interchange and Cross-Reference Guidance
RA10008 and IKO CRBS1008 belong to a similar 100 × 116 × 8 mm slim crossed-roller dimensional family. However, internal design, roller complement, clearance, accuracy notation, seals, lubrication holes and shoulder requirements may differ.
Never approve substitution from the model name alone. Provide the existing bearing designation, suffixes, equipment drawing and operating conditions so LYDL can compare the RA10008 cross roller bearing against the target product and issue an approved dimensional drawing.
RA10008 Cross Roller Bearing FAQ
1. Why is RA10008 only 8 mm wide despite its 100 mm bore?
The RA series was developed for a very small radial and axial section. RA10008 preserves a large through-bore while minimizing installed width, making it useful for compact precision joints and stages. The trade-off is lower load capacity than a heavier cross roller bearing of the same bore.
2. Which ring should rotate in an RA10008 installation?
The one-piece inner ring is normally used as the rotating ring when running accuracy is required. Because the outer ring is separable, it should be fully supported and clamped uniformly by a rigid housing.
3. Can the RA10008 carry moment load?
Yes. The 90-degree crossed-roller arrangement can support moment as well as radial and bidirectional axial loads. Selection must still account for the actual moment arm, combined load, housing stiffness, preload and target life.
4. Should I choose RA10008 or RAU10008?
Choose RA10008 when the separable outer ring and housing-clamped arrangement fit the machine architecture. RAU10008 uses an integrated-ring construction intended to improve handling and interchangeability, so its drawing and mounting method must be evaluated separately.
5. Is RA10008UU always better than the open version?
No. UU seals improve grease retention and contamination protection, but they add friction and may affect starting torque. An open RA10008 cross roller bearing can be preferable inside a clean, sealed mechanism with controlled lubrication.
6. What is the difference between C0 and CC0?
C0 generally denotes a standard or positive-clearance class, while CC0 identifies a controlled negative-clearance or preloaded class in many RA catalogues. Exact ranges are manufacturer-specific, so specify the desired rigidity and torque rather than relying only on the suffix.
7. Can RA10008 directly replace IKO CRBS1008?
The principal boundary dimensions may match, but direct interchange is not automatic. Confirm shoulder geometry, seals, accuracy, clearance, torque, lubrication details and the controlled drawings from both suppliers before replacement.
8. Is RA10008 suitable for continuous high-speed rotation?
It is primarily selected for compact, accurate motion rather than from bore size alone. Continuous speed capability depends on load, preload, lubricant, sealing drag, heat dissipation and temperature, so a speed value should be approved for the actual duty cycle.
Request an RA10008 Quotation
Send your drawing or equipment model to receive an RA10008 cross roller bearing quotation. Include quantity, target delivery, loads, speed, rotating ring, accuracy, clearance or preload, sealing, lubricant and operating temperature so LYDL can recommend a traceable configuration without delaying technical approval.
ISO 281:2007 — rolling-bearing dynamic load ratings and rating life.
ISO 76:2006 — rolling-bearing static load ratings.
ISO 492:2023 — geometrical product specifications and tolerance values for radial bearings.
Engineering note: Catalogue data support preliminary selection only. Final life, fit, clearance, accuracy and interchangeability require complete application data and an approved LYDL drawing.
