NTN - Precision Rolling Bearings
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Main Spindle <strong>Bearings</strong><br />
r1as<br />
ras<br />
ras<br />
da Db<br />
ras<br />
da Da<br />
Dynamic equivalent radial loadPrXFrYFa<br />
Single row / Tandem Back-to-back / Face-to-face<br />
e Fa Fre Fa Fre Fa Fre Fa Fre<br />
X Y X Y X Y X Y<br />
0.8 1 0 0.39 0.76 1 0.78 0.63 1.24<br />
Back-to-back<br />
(DB)<br />
Face-to-face<br />
(DF)<br />
Static equivalent radial loadPorXo FrYo Fa<br />
Single row / Tandem Back-to-back / Face-to-face<br />
Xo Yo Xo Yo<br />
0.5 0.33 1 0.66<br />
When Por Fr with single-row or tandem<br />
arrangement, Por Fr.<br />
Load Internal Mass Reference dimensions Abutment and fillet dimensions Part<br />
center free space number<br />
mm cm 3 kg mm<br />
Single-row Single-row da Da Db ras r1as<br />
a (approx.) (approx.) d1 d2 D1 D2 min max max max max<br />
7.7 0.4 0.009 14.3 13.5 17.7 19.3 12.5 19.5 20.8 0.3 0.15 5S-7900U<br />
8.2 0.4 0.010 16.3 15.5 19.7 21.3 14.5 21.5 22.8 0.3 0.15 5S-7901U<br />
9.8 0.8 0.013 19.3 18.3 23.7 25.7 17.5 25.5 26.8 0.3 0.15 5S-7902U<br />
10.3 0.8 0.015 21.3 20.3 25.7 27.7 19.5 27.5 28.8 0.3 0.15 5S-7903U<br />
12.8 1.5 0.033 25.9 24.7 31.1 33.5 22.5 34.5 35.8 0.3 0.15 5S-7904U<br />
14.2 1.8 0.039 30.9 29.7 36.1 38.5 27.5 39.5 40.8 0.3 0.15 5S-7905U<br />
15.7 2.0 0.044 35.9 34.7 41.1 43.5 32.5 44.5 45.8 0.3 0.15 5S-7906U<br />
18.1 3.4 0.062 41.6 39.9 48.4 51.6 39.5 50.5 52.5 0.6 0.3 5S-7907U<br />
20.8 4.7 0.10 47.6 45.9 54.4 57.7 44.5 57.5 59.5 0.6 0.3 5S-7908U<br />
22.4 5.9 0.11 52.7 50.8 60.4 64.0 49.5 63.5 65.5 0.6 0.3 5S-7909U<br />
23.7 6.2 0.11 57.2 55.3 64.9 68.4 54.5 67.5 69.5 0.6 0.3 5S-7910U<br />
26.1 7.5 0.16 63.7 61.8 71.4 75.0 60.5 74.5 75.5 1 0.6 5S-7911U<br />
27.5 8.0 0.17 68.7 66.8 76.4 80.0 65.5 79.5 80.5 1 0.6 5S-7912U<br />
29.0 8.6 0.19 73.7 71.8 81.4 85.0 70.5 84.5 85.5 1 0.6 5S-7913U<br />
32.6 14 0.30 80.3 78.0 89.7 94.2 75.5 94.5 95.5 1 0.6 5S-7914U<br />
34.1 15 0.32 85.3 83.0 94.7 99.2 80.5 99.5 100.5 1 0.6 5S-7915U<br />
35.7 16 0.30 90.8 88.5 100.2 104.7 85.5 104.5 105.5 1 0.6 5S-7916U<br />
38.7 22 0.47 96.9 94.3 108.1 113.4 92 113 115.5 1 0.6 5S-7917U<br />
40.2 23 0.49 101.9 99.3 113.1 118.4 97 118 120.5 1 0.6 5S-7918U<br />
41.6 24 0.52 106.9 104.3 118.1 123.4 102 123 125.5 1 0.6 5S-7919U<br />
44.8 33 0.70 113.6 110.5 126.4 132.6 107 133 135.5 1 0.6 5S-7920U<br />
46.2 34 0.73 118.6 115.5 131.4 137.6 112 138 140.5 1 0.6 5S-7921U<br />
47.7 36 0.76 123.6 120.5 136.4 142.6 117 143 145.5 1 0.6 5S-7922U<br />
52.3 48 1.03 135.2 131.7 149.8 156.7 127 158 160.5 1 0.6 5S-7924U<br />
56.9 63 1.34 146.9 143.0 163.2 170.9 138.5 171.5 174.5 1.5 1 5S-7926U<br />
103
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