Thin Section Bearing Types
Three contact geometries cover nearly every thin section application: radial contact for straight radial load, angular contact for radial plus thrust one way, and four-point contact for anything with a moment in it. This section groups the families built on those three. SES holds the range as an authorised SKF distributor, covering contact types Radial (C), angular (A), four-point (X); rolling elements Balls in most families, tapered rollers in the KT series; sections Fixed cross sections across a broad bore span; closures Open, shielded and sealed variants of each type. Executions include Reali-Slim thin section bearings, Reali-Slim TT turntable thin section bearings, BB series metric thin section ball bearings, KT series thin section tapered roller bearings, among others. It is specified most often into rotary joints on articulated arms and manipulators and camera, sensor and antenna pan-tilt heads. Every part is genuine SKF through official channels, with designation, specification and options confirmed against your duty before it ships — supplied from Kolkata and our branch network, with breakdown cover that does not sit in an inbox.
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C type
Radial contact — radial load
A type
Angular contact — radial plus one-way thrust
X type
Four-point contact — combined load and moment
Choice driver
Load direction, not load size
Where it runs.
You will find Thin Section Bearing Types in the parts of a plant where this particular duty actually occurs. In practice that means rotary joints on articulated arms and manipulators, camera, sensor and antenna pan-tilt heads, machine tool tool-changer and turret discs, and equally gantry and scanner rotation axes, turntables in inspection and test equipment, compact indexing units on assembly machines. What links them is the duty rather than the machine name — c type: Radial contact — radial load. If your installation is not on that list it matters less than you would think: the operating condition decides the specification. Send us the load, the speed, the running temperature and the environment it runs in, and we will match it to the right execution in the SKF range and confirm what is in stock.
Specify it against the duty.
Specification here follows the operating condition, not the catalogue. Load direction changes during the working cycle — Four-point contact, which takes thrust both ways in a single bearing instead of needing a matched opposed pair. Two bearings are already spread along the shaft — An angular contact pair, and choose face-to-face or back-to-back from where the moment is applied — not from whichever is easier to assemble. Load is genuinely only radial and speed is the concern — Radial contact, which has the lowest friction of the three and the highest speed capability. Where two of those apply at once, specify for the harsher of the two — under-specifying is what puts the part back on the bench a month later. Send us the duty and we will confirm the execution.
Ordering this from SES.
Draw the load vector before you pick a type. Most thin section failures trace back to a designer choosing a section that fitted and then hoping the geometry would cope with a moment nobody had calculated.