Single Row Angular Contact Ball Bearings
One row of balls running on offset raceways, taking radial load together with axial load in one direction only. Because it cannot support itself, the bearing always works against a second bearing that pushes back. SES holds the range as an authorised SKF distributor, covering bore range About 10 mm to 320 mm; standard contact angle 40 degrees on general purpose executions; series 72 and 73 dimension series most common in plant; cages Glass fibre reinforced polyamide or machined brass. Executions include 40 degree contact angle execution, 25 degree contact angle execution, universally matchable bearings, polyamide cage execution, among others. It is specified most often into vertical spindle grinders and boring heads and bevel gear pinion shafts in mill drive trains. 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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From integrated steel plants to power utilities and EPC majors — the works that cannot afford a counterfeit part specify through SES.
Thrust
One direction only, must be opposed
Faces
Wide face and narrow face, not interchangeable
Separable
No, rings are non-separable in use
Typical angle
40 degrees standard, 25 and 30 degrees available
Where it runs.
You will find Single Row Angular Contact Ball Bearings in the parts of a plant where this particular duty actually occurs. In practice that means vertical spindle grinders and boring heads, bevel gear pinion shafts in mill drive trains, vertical multistage pump thrust ends, and equally ventilation fan shafts with a strong axial thrust, screw jack and worm drive output shafts, small turbine and turbocharger auxiliary shafts. What links them is the duty rather than the machine name — thrust: One direction only, must be opposed. 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. Two bearings are to be preloaded against each other on one shaft — Universally matchable bearings with the correct matching suffix. Two random singles never share load and the harder-loaded one sets the life of the machine. The thrust reverses briefly on stopping or reversing — A back-to-back set rather than a single bearing plus a shoulder, since a momentary reversal that unloads a single row lets the balls skid across the raceway. Speed is high and heat generation must be kept down — A lower contact angle and a polyamide cage, accepting the reduced thrust capacity that comes with it. 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.
Two single row bearings taken off the shelf are not a matched pair unless they carry the universal matching suffix. Mix unmatched bearings in a back-to-back set and one of them ends up carrying almost the entire thrust.