Thrust Spherical Plain Bearings
Pure axial load combined with tilt is the job here. The sphere is arranged so the whole load passes straight along the pin axis, while the two rings remain free to sit at an angle to one another. SES holds the range as an authorised SKF distributor, covering bore range Roughly 12 mm to 300 mm; load direction Axial, single direction; sliding pairs Steel/steel greased, steel/PTFE maintenance-free; misalignment Several degrees, independent of load. Executions include steel/steel greased executions, maintenance-free PTFE lined executions, executions supplied with a matching seating washer, heavy series for higher axial capacity. It is specified most often into hydraulic jack and cylinder foot mountings and column and pillar supports on heavy fabrications. 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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Load
Axial, one direction only
Tilt
Taken up without edge loading
Speed
Very low, oscillating
Sliding pair
Steel/steel or steel/PTFE
Where it runs.
You will find Thrust Spherical Plain Bearings in the parts of a plant where this particular duty actually occurs. In practice that means hydraulic jack and cylinder foot mountings, column and pillar supports on heavy fabrications, rocker supports under kilns, ducting and expansion joints, and equally lifting screw and jack head bearings, ladle and mould car support points, press tie-rod and knuckle supports. What links them is the duty rather than the machine name — load: Axial, one direction only. 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 reverses or lifts off during the cycle — Fit a second bearing opposed, or retain the assembly mechanically. These carry one way only and will separate under lift-off. The bearing supports a structure that settles slowly — Steel/PTFE, which tolerates long dwell under load without the seizure steel/steel gets when a joint never moves. Calculated contact pressure sits at the catalogue limit — Move up a size rather than accept it. Plain thrust bearings fail by liner extrusion, and extrusion begins well below the stated limit once temperature rises. 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.
These dislike standing still under full load for months on end. If the plant only moves the joint at shutdown, either build a movement cycle into the routine or specify the PTFE-lined type from the outset.