NTN - Large Bearings
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Bearing Tolerances<br />
3.2 Limits and tolerances for chamfer and<br />
tapered bore<br />
Side face of inner<br />
ring or center<br />
washer, or side face<br />
of outer ring<br />
Bore diameter face<br />
of bearing or outer<br />
diameter face of<br />
bearing<br />
rs minor<br />
r1s min<br />
rs minor r1s min<br />
rs maxor r1s max<br />
(Axial direction)<br />
rsminor r1smin<br />
rsmaxor r1smax<br />
(Radial direction)<br />
Table 3.9 Allowable critical-value of bearing chamfer<br />
Table 3.9 (1) Radial bearing (except tapered roller bearing)<br />
Unit mm<br />
rs min 1<br />
or<br />
r1s min<br />
0.6<br />
1<br />
1.1<br />
1.5<br />
2<br />
2.1<br />
2.5<br />
3<br />
4<br />
5<br />
6<br />
7.5<br />
9.5<br />
12<br />
15<br />
19<br />
rs maxorr1s max<br />
Nominal<br />
over incl. direction direction<br />
bore diameter<br />
d<br />
Radial<br />
Axial<br />
–<br />
40<br />
–<br />
50<br />
–<br />
120<br />
–<br />
120<br />
–<br />
80<br />
220<br />
–<br />
280<br />
–<br />
100<br />
280<br />
–<br />
280<br />
–<br />
–<br />
–<br />
–<br />
–<br />
–<br />
–<br />
–<br />
40<br />
–<br />
50<br />
–<br />
120<br />
–<br />
120<br />
–<br />
80<br />
220<br />
–<br />
280<br />
–<br />
100<br />
280<br />
–<br />
280<br />
–<br />
–<br />
–<br />
–<br />
–<br />
–<br />
–<br />
–<br />
–<br />
1<br />
1.3<br />
1.5<br />
1.9<br />
2<br />
2.5<br />
2.3<br />
3<br />
3<br />
3.5<br />
3.8<br />
4<br />
4.5<br />
3.8<br />
4.5<br />
5<br />
5<br />
5.5<br />
6.5<br />
8<br />
10<br />
12.5<br />
15<br />
18<br />
21<br />
25<br />
2<br />
2<br />
3<br />
3<br />
3.5<br />
4<br />
4<br />
5<br />
4.5<br />
5<br />
6<br />
6.5<br />
7<br />
6<br />
6<br />
7<br />
8<br />
8<br />
9<br />
10<br />
13<br />
17<br />
19<br />
24<br />
30<br />
38<br />
1These are the allowable minimum dimensions of the chamfer dimension<br />
"r" or "r1" and are described in the dimensional table.<br />
Table 3.9 (2) Tapered roller bearings of metric system<br />
rs min 2<br />
or<br />
r1s min<br />
Nominal bore 3<br />
diameter of bearing<br />
"d" or nominal<br />
outside diameter "D"<br />
over incl.<br />
Radial<br />
direction<br />
rs max orr1s max<br />
Axial<br />
direction<br />
Unit mm<br />
0.3<br />
0.6<br />
1<br />
–<br />
–<br />
–<br />
40<br />
40<br />
50<br />
0.7<br />
1.1<br />
1.6<br />
1.4<br />
1.7<br />
2.5<br />
40<br />
40<br />
50<br />
–<br />
–<br />
–<br />
0.9<br />
1.3<br />
1.9<br />
1.6<br />
2<br />
3<br />
1.5<br />
2<br />
2.5<br />
3<br />
–<br />
120<br />
250<br />
–<br />
120<br />
250<br />
–<br />
120<br />
250<br />
–<br />
120<br />
250<br />
400<br />
–<br />
120<br />
250<br />
–<br />
120<br />
250<br />
–<br />
120<br />
250<br />
–<br />
120<br />
250<br />
400<br />
–<br />
120<br />
2.3<br />
2.8<br />
3.5<br />
2.8<br />
3.5<br />
4<br />
3.5<br />
4<br />
4.5<br />
4<br />
4.5<br />
5<br />
5.5<br />
5<br />
3<br />
3.5<br />
4<br />
4<br />
4.5<br />
5<br />
5<br />
5.5<br />
6<br />
5.5<br />
6.5<br />
7<br />
7.5<br />
7<br />
4<br />
120 250 5.5<br />
7.5<br />
250 400 6<br />
8<br />
400 –<br />
6.5<br />
8.5<br />
5<br />
6<br />
–<br />
–<br />
180<br />
180<br />
6.5<br />
7.5<br />
8<br />
10<br />
180<br />
180<br />
–<br />
–<br />
7.5<br />
9<br />
9<br />
11<br />
2 These are the allowable minimum dimensions of the chamfer dimension<br />
"r" or "r1" and are described in the dimensional table.<br />
3 Inner rings shall be in accordance with the division of "d" and outer rings<br />
with that of "D".<br />
Note: This standard will be applied to the bearings whose dimensional series<br />
(refer to the dimensional table) are specified in the standard of ISO 355<br />
or JIS B 1512. Please consult <strong>NTN</strong> Engineering on non-standard<br />
bearings.<br />
A-20
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