Needle Roller Bearings - Ntn-snr.com
Needle Roller Bearings - Ntn-snr.com
Needle Roller Bearings - Ntn-snr.com
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<strong>Needle</strong> roller and cage assemblies<br />
NTN<br />
Inter-roller diameter deviation of needle rollers<br />
Inter-roller diameter deviation of needle rollers which<br />
are built in one cage is within 2um. The respective<br />
specified diameter tolerances for built-in needle rollers<br />
are identified by identification colors on the package label,<br />
as shown in Table 1.<br />
The standard identification colors marked on each label<br />
are red, dark blue, blue, black and white, unless<br />
otherwise specially indicated.<br />
Where two or more bearings are used in tandem, those<br />
of same identification color must be used for equal<br />
distribution of bearing load.<br />
Table 1 Color identification of diameter tolerances for needle roller bearings<br />
Identification color on label Diameter tolerance m Classification<br />
Shaft and housing specifications<br />
Where a shaft and a housing are used as the direct<br />
raceway surface, the raceway surface must meet the<br />
specifications described in Table 3.<br />
Table 3 Shaft and housing specifications<br />
Characteristics<br />
Roundness (max)<br />
Cylindricality (max)<br />
Surface roughness (max)<br />
Surface hardness<br />
Depth of hardened layer (min)<br />
Shaft<br />
Housing<br />
IT3<br />
IT4<br />
IT3<br />
IT4<br />
Refer to Table 7.4 on page A-39.<br />
HRC5864<br />
Refer to formula (7.1) on page A-39<br />
Red<br />
Dark blue<br />
Blue<br />
Black<br />
White<br />
Gray<br />
Green<br />
Brown<br />
Yellow<br />
0 2<br />
1 3<br />
2 4<br />
3 5<br />
4 6<br />
5 7<br />
6 8<br />
7 9<br />
810<br />
Standard<br />
Semi-standard<br />
Bearing installation related dimensions<br />
The tolerances for the nominal dimension "Bc" of cage<br />
specified in Table 4 are re<strong>com</strong>mended as the guide width<br />
b of cage.<br />
Table 4 Guide width tolerances<br />
Unit : mm<br />
Tolerances for guide width b<br />
Classification<br />
Single row Double row<br />
Metric system<br />
Bc 0.2<br />
0<br />
Bc 0.3<br />
0.1<br />
Radial Clearance<br />
Inch system<br />
Bc 0.4<br />
0.2<br />
Bc 0.5<br />
0.3<br />
When a shaft and a housing are used as the direct<br />
raceway surface, the radial clearance is determined by<br />
the shaft diameter and the housing hole dimension.<br />
Where the diameter tolerances for needle rollers are<br />
standard (tolerances color-identified in red, dark blue,<br />
blue, black, white), the shaft diameters and housing hole<br />
dimensions shown in Table 2 are used.<br />
b<br />
Bc<br />
Table 2 Re<strong>com</strong>mended fits<br />
Shaft diameter mm<br />
Smaller than ordinary clearance<br />
Radial<br />
Ordinary clearance<br />
clearance<br />
Larger than ordinary clearance<br />
80<br />
j5/G6<br />
h5/G6<br />
g6/G6<br />
80140<br />
h5/G6<br />
g5/G6<br />
f6/G6<br />
140<br />
h5/G6<br />
f5/H6<br />
f6/G6<br />
Shaft guide<br />
b<br />
Bc<br />
<br />
Housing guide<br />
Fig. 1<br />
B-5
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