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        Home > Bearing Basic Knowledge > Minimum Loading > Minimum Load-Angular Contact Ball Bearings

        Minimum Load-Angular Contact Ball Bearings

        In order to keep bearings working in a good condition, a minimum load must be imposed on bearings, particularly on bearings working at high speeds, high accelerations, or with the load direction changing frequently, because under these working conditions, inertial force of balls and cage and lubricant friction will have bad influence on the rotation of bearings, and detrimental sliding movement may be caused.

        The minimum load of a single angular contact ball bearing can be obtained from

        Minimum Load-Angular Contact Ball Bearings

        For the bearings arranged face-to-face or back-to-back

        Minimum Load-Angular Contact Ball Bearings


        Fmin ─ Minimum radial load, N

        Famin ─ Minimum radial load, N

        C0 - Static load rating,N

        V ─ Oil viscosity at operating

        temperature, mm2/s

        n ─ Speed, r/min

        dm ─ Mean diameter of bearing,dm=0.5(d+D),mm

        ka ─ Minimum axial load factor(see Table 1)

        kr ─Minimum radial load factor(see Table 1)

        Table 1


        Bearing Series















        When bearings are started at low ambient temperatures or in the condition that the viscosity of lubricant is very high, a larger minimum load is need. Usually, the weight of bearing supporting parts plus the load on the bearing should be over the minimum load. If the weight can not be up to the minimum load, then extra radial load must be imposed on this type of bearing in order to meet the requirement of minimum load.

        For single-row angular contact ball bearing and angular contact ball bearing arranged in tandem, the requirement can be met through adjusting the axial relative position of inner ring and outer ring, or preloading in axial with springs.

        Basic load ratings in the product table are only suitable for mounting single bearing. Basic load ratings for single bearings arranged in pairs can be obtained from

        Basic dynamic load ratings:

        In tandem: C1=2C

        Back to back or face to face or other arrangement: C1=1.62C

        C-Basic dynamic load rating of a single angular contact ball bearing.

        C1-Basic dynamic load rating of angular contact ball bearings arranged in tandem, face to face or back to bac

        Basic rated static loading

        C0 = 2 C0

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