How to find the right Crossed Roller Bearings AI guide
Written by an AI model from its trained knowledge.
What the AI looks for in Crossed Roller Bearings
- Exact dimensional match
- Bore, outside diameter and width must match the drawing or the old bearing exactly; match the series code (e.g. THK RB/RU, IKO CRBH) rather than only nominal size. Crossed roller bearings are built to fit a specific rotary table, robot joint or indexer housing, and there is no slack for near-fit substitutes.
- Ring construction
- Choose a split outer ring, split inner ring or one-piece integrated rings with mounting holes to suit your housing and clamping design. The ring style decides whether you need clamping flanges and how rigid the assembled joint is.
- Precision class and preload
- Specify the ISO/JIS precision class and the radial clearance or preload code given in the original part number. Runout and stiffness, which are the reason to use a crossed roller bearing, come from these two specifications.
- Moment load capacity
- Check the rated moment load against your overhung load. Do not size on radial capacity alone. These bearings are usually chosen to carry combined radial, axial and tilting loads in one compact ring, so moment load tends to be the limiting factor.
- Housing and shaft rigidity
- Follow the maker's recommended fits and keep housings stiff and evenly clamped. Thin-section rings take on the shape of what they are bolted to, and distortion causes uneven roller contact and early wear.
Brands that matter
- THK: Broad crossed roller range (RB, RU and others) widely used in robotics and rotary tables.
- IKO (Nippon Thompson): Major maker of crossed roller bearings in standard and integrated-ring forms.
- Schaeffler (INA): Offers crossed roller and slewing-type precision bearings for machine tools.
- NSK: Supplies precision crossed roller bearings for machine tool and robot applications.
- HIWIN: Offers crossed roller bearings alongside its motion components.
What to avoid
- Unbranded crossed roller bearings with no stated precision class or preload.
- Substituting a size-matched bearing from a different series without checking ring style and mounting holes.
- Over-tightening uneven clamp bolts on split-ring designs.
Questions
Can I replace a crossed roller bearing with a pair of angular contact bearings?
Sometimes, but the pair takes more axial space and needs a redesigned housing. A crossed roller bearing handles moment loads in a single thin ring.