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BEARING TOLERANCES

Table 8. 8 Tolerances of Instrument Ball Bearings (Inch design)
CLASS 5P, CLASS 7P, and CLASS 9P
(ANSI/ABMA Equivalent)
(1) Tolerances for Inner Rings
and Width of Outer Rings

Units : μm

Nominal & dmp & ds V dp V dmp & Bs (or & Cs ) V Bs K ia S ia Sd
Bore
Diameter CLASS 5P CLASS 9P CLASS 5P CLASS 9P CLASS 5P CLASS 9P CLASS 5P CLASS 9P Single Brgs Combined Brgs (1) CLASS CLASS CLASS CLASS CLASS CLASS CLASS CLASS CLASS CLASS CLASS CLASS
CLASS 7P CLASS 7P CLASS 7P CLASS 7P 5P 7P 9P 5P 7P 9P 5P 7P 9P 5P 7P 9P
d CLASS 5P CLASS 5P
high low CLASS 7P CLASS 7P max. max. max. max. max. max. max. max. max. max. max.
(mm) CLASS 9P CLASS 9P 2.5 1.3 3.8 2.5 1.3 7.6 2.5 1.3 7.6 2.5 1.3
0 -5.1 2.5 1.3 3.8 2.5 1.3 7.6 2.5 1.3 7.6 2.5 1.3
over incl. high low high low high low max. max. max. max. high low high low max. 2.5 1.3 3.8 3.8 2.5 7.6 3.8 1.3 7.6 3.8 1.3

- 10 0 -5.1 0 -2.5 0 -2.5 2.5 1.3 2.5 1.3 0 -25.4 0 -400 5.1

10 18 0 -5.1 0 -2.5 0 -5.1 0 -2.5 2.5 1.3 2.5 1.3 0 -25.4 0 -400 5.1

18 30 0 -5.1 0 -2.5 0 -5.1 0 -2.5 2.5 1.3 2.5 1.3 0 -25.4 0 -400 5.1

Note (1) Applicable to bearings for which the axial clearance (preload) is to be adjusted by combining two selected bearings.
Remarks For the CLASS 3P and the tolerances of Metric design Instrument Ball Bearings, it is advisable to consult NSK.

(2) Tolerances for Outer Rings Units : μm

Nominal & Dmp & Ds V Dp V Dmp V Cs (1) SD K ea S ea Deviation of Deviation of Flange
Outside Flange Outside Flange Width Backface
Diameter CLASS 5P CLASS 9P CLASS 5P CLASS CLASS 5P CLASS Runout
CLASS 7P CLASS 7P 9P CLASS 7P 9P Diameter & C 1s with
D & D 1s Raceway
CLASS 5P CLASS CLASS CLASS CLASS CLASS CLASS CLASS CLASS CLASS CLASS CLASS CLASS
(mm) CLASS 7P 5P 7P 9P 5P 7P 9P 5P 7P 9P 5P 7P 9P CLASS 5P (2) S ea1
CLASS 7P
CLASS 9P

Open Shielded Open Open Shielded Open Open Shielded Open CLASS 5P CLASS 5P
Sealed Sealed Sealed CLASS 7P CLASS 7P

over incl. high low high low high low high low high low max. max. max. max. max. max. max. max. max. max. max. max. max. max. max. max. max. max. high low high low max.

- 18 0 -5.1 0 -2.5 0 -5.1 +1 -6.1 0 -2.5 2.5 5.1 1.3 2.5 5.1 1.3 5.1 2.5 1.3 7.6 3.8 1.3 5.1 3.8 1.3 7.6 5.1 1.3 0 -25.4 0 -50.8 7.6
5.1 2.5 1.3 7.6 3.8 1.3 5.1 3.8 2.5 7.6 5.1 2.5 0 -25.4 0 -50.8 7.6
18 30 0 -5.1 0 -3.8 0 -5.1 +1 -6.1 0 -3.8 2.5 5.1 2 2.5 5.1 2 5.1 2.5 1.3 7.6 3.8 1.3 5.1 5.1 2.5 7.6 5.1 2.5 0 -25.4 0 -50.8 7.6

30 50 0 -5.1 0 -3.8 0 -5.1 +1 -6.1 0 -3.8 2.5 5.1 2 2.5 5.1 2

Notes (1) Applicable to flange width variation for flanged bearings.
(2) Applicable to flange back face.

A 76 A 77