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7. BOUNDARY DIMENSIONS AND IDENTIFYING NUMBERS FOR BEARINGS

7.1 Boundary Dimensions and Dimensions of 7.1.2 Dimensions of Snap Ring Grooves and T Diameter 4 Height
Snap Ring Grooves Locating Snap Rings C Series Series
r r1 012 3
7.1.1 Boundary Dimensions The dimensions of Snap ring grooves in the outer
surfaces of bearings are specified by ISO 464. Also, r r1 Dimension series
The boundary dimensions of rolling bearings, which the dimensions and accuracy of the locating snap rings 70
are shown in Figs.7.1 through 7.5, are the dimensions themselves are specified by ISO 464. The dimensions r1 r 71 7
that define their external geometry. They include bore of snap ring grooves and locating snap ring for 72
diameter d, outside diameter D, width B, bearing bearings of diameter series 8, 9, 0, 2, 3, and 4, are r1 r 73
shown in Table 7.4 (Pages A50 to A53). jd jD
width(or height) T, chamfer dimension r, etc. It is 74
B
necessary to know all of these dimensions when 90
mounting a bearing on a shaft and in a housing. 91 9
These boundary dimensions have been internationally 92
standardized (ISO15) and adopted by JIS B 1512 B Fig. 7.2 Tapered Roller Bearings 93
(Boundary Dimensions of Rolling Bearings). rr
The boundary dimensions and dimension series of 94
radial bearings, tapered roller bearings, and thrust rr 1
bearings are listed in Table 7.1 to 7.3 (Pages A40 to 10
A49). jd r 11
In these boundary dimension tables, for each bore 12
number, which prescribes the bore diameter, other r 13
boundary dimensions are listed for each diameter T
series and dimension series. A very large number r r 14
of series are possible; however, not all of them are r r jd jD r
commercially available so more can be added in the
future. Across the top of each bearing table (7.1 to r 2
7.3), representative bearing types and series symbols jD
are shown (refer to Table 7.5, Bearing Series Symbols, Fig. 7.3 Single-Direction Thrust Ball Bearings 22
Page A55). 23
The relative cross-sectional dimensions of radial
bearings (except tapered roller bearings) and thrust
bearings for the various series classifications are
shown in Figs. 7.6 and 7.7 respectively.

Fig. 7.1 Boundary Dimensions of Radial Ball jd r
and Roller Bearings
r1 r
24
T2 r1
r1 Fig. 7.7 Comparison of Cross Sections of Thrust Bearings
jd 2 B T1 (except Diameter Series 5) for Various
T2 Dimension Series
r1
r

Width Series 8 0 1 2 3 4 56

4 r
jD
Diameter 3 Fig. 7.4 Double-Direction Thrust Ball Bearings
Series
2
1
9 0

8

Dimension 82 00 03 04 18 19 10 11 38 48 58 68 r jd
Series 83 02 12 39 49 59 69 r
30 40 50 60
09 13 31 41
01 28 32 42
33
29
08 20 21
22

23
24

T
r

Fig. 7.6 Comparison of Cross Sections of Radial Bearings (except Tapered Roller Bearings) for various Dimensional Series r
A 38 jD

Fig. 7.5 Spherical Thrust Roller Bearings

A 39