NACHI Self-aligning Ball Bearings

This ball bearing is self-aligning and therefore operates normally when the mandrel's deflection or tilt is unavoidable.
Although this is a double row ball bearing, its load capacity is lower than that of a deep groove ball bearing of the same size. This
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There are two kinds of retainers, one is a press-formed iron retainer and the other is a resin retainer made of polyamide (nylon). Resin-retainer bearings are indicated by a "G" on the back of the boxed version.
Self-aligning ball bearing diameter, cylindrical hole and tapered hole (taper 1/12) two. Tapered bore diameter of the bearings, will be in the back after filling Fan "K" to indicate.
 Clearance mark
The range of clearance is in accordance with Japanese Industrial Standards (JIS).
Self-aligning ball bearings detailed gap range.
 Bearing life
Frequently asked question is: "How much power can this bearing withstand?"
Strictly speaking, the maximum force that a bearing can withstand without damage is equal to the "basic static load rating" in the specification table. But does not mean that can run for a long time!
Should be asked is, in the use of load and speed, the bearing can achieve the required life?
Bearing life can be calculated, but before calculating life expectancy, you need to know the speed and equivalent load. The so-called equivalent load is calculated when the bearing bear both radial load (Fr) and axial load (Fa), which is equivalent to pure radial load calculation load, usually expressed in Pr and Por. Please refer to the table at the top right of catalog for the calculation method of Pr and Por.
After you get the equivalent load (Pr) and the static equivalent load (Por), you can calculate the bearing life and safety factor.
Recommended tolerances
In order to play the performance of the bearing itself, the tolerance of the mandrel and the bearing seat hole is very important. Slipping may occur if there is insufficient interference with the mating surface.
Once skidding occurs, the mating surface will gradually wear and damage the mandrel and housing. In addition, abrasion powder may also penetrate inside the bearing leading to the occurrence of early damage.
Slipping can not be prevented by axial grasping only, and the wheel bearing the load must provide enough interference.
Mandrel and chock suggested accuracy
Recommended accuracy for mandrels and housings under normal conditions of use.
Self-aligning ball bearings only have anti-rust oil, so they must be supplied with lubricant at the time of use.
Extreme speed
The speed limits listed in the catalog are values ​​under normal conditions of use. In the heavy load or axial load is relatively high, the limit speed must be multiplied by a correction factor.
Other precautions
[1] The basic dynamic load rating (Cr) and basic static load rating (Cor) in the dimension tables are only valid for bearing steels and are subject to standard heat treatment.
[2] Although the contact type rubber-covered type bearings have good grease tightness, the grease may still leak out at high temperature, high speed or rotation of the outer ring.
[3] Sealed bearings do not clean prior to assembly.
[4] Single-sided iron cover or single-sided plastic cover of the bearings, the inner and outer wheels are not covered with machining oil seal groove.
 Conical bore installation
This bearing installation requires experience and technology. Conical bore bearing are interference with the group above the mandrel.
The measurement of the interference can be achieved by the axial displacement of the inner wheel or the reduction of the radial clearance. In general, the reduction of radial clearance is a more reliable method of good measurement.
Bearing diameterd(mm)
Axial displacement
s (mm)
Average residual clearance
Bearing series CNgap
12K 13K 22K 23K
20 70 0.22 0.23 10 20
25 70 0.22 0.23 0.22 0.23 10 20
30 70 0.22 0.23 0.22 0.23 10 20
35 70 0.30 0.30 0.30 0.30 10 20
40 70 0.30 0.30 0.30 0.30 10 20
45 70 0.31 0.34 0.31 0.33 15 25
50 70 0.31 0.34 0.31 0.33 15 25
55 90 0.40 0.41 0.39 0.40 15 30
60 90 0.40 0.41 0.39 0.40 15 30
65 90 0.40 0.41 0.39 0.40 15 30
75 120 0.45 0.47 0.43 0.46 20 40
80 120 0.45 0.47 0.43 0.46 20 40
85 120 0.58 0.60 0.54 0.59 20 40
90 120 0.58 0.60 0.54 0.59 20 40
95 120 0.58 0.60 0.54 0.59 20 40
100 120 0.58 0.60 0.54 0.59 20 40
105 120 0.67 0.66 25 55
110 120 0.67 0.70 0.66 0.69 25 55
120 120 0.67 25 55
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