Bearing selection by duty cycle: motor, gearbox, pump, spindle
Which bearing fits which machine? Speed, radial load and runout decide the type: deep groove for plain radial duty, matched angular contact pairs where thrust and stiffness drive the choice. Below are the duty cycles we build to, and the dimensions buyers normally send us first.
Electric motors for pumps and fans (IE3/IE4 frames)
1450–1750 rpm with steady radial load and low thrust: deep groove ball bearings on P5 tolerance with C3 clearance fit the shaft without preloading, holding noise levels down.
Industrial gearboxes and screw compressors
Gear mesh creates axial share up to 30% of load. Matched angular contact pairs in P5 with defined preload take that thrust and keep shaft deflection under 8 µm.
Centrifugal and hydraulic pumps
Continuous 2900 rpm duty with water or hydraulic oil: deep groove bearings in P6 with C3 or C4 internal clearance protect against thermal growth in the housing.
Machine tool and precision spindle drives
Spindle speeds above 10,000 rpm demand P5/P6 runout and matched contact angles of 15° or 25°. We supply as an OEM bearing set matched pair, serial-number logged.
Robotics, servo and precision transmission units
Repeatable positioning depends on preload stability, not just rating. Matched angular contact sets with documented preload and P5 tolerance shorten settling time on servo axes.
OEM and Tier-1 replacement programmes
Running a deep groove ball bearing OEM supplier schedule? We quote against your drawing or ISO 492 references, hold P5/P6 across batches, and ship in 25–35 days.