NTN - Precision Rolling Bearings

Main Spindle Bearings
r1as
ras
ras
daDb
r1as
dbDa
Dynamic equivalent radial loadPrXFrYFa
Single row / Tandem Back-to-back / Face-to-face
e Fa Fre Fa Fre Fa Fre Fa Fre
X Y X Y X Y X Y
0.57 1 0 0.43 1 1 1.09 0.7 1.63
Back-to-back
(DB)
Face-to-face
(DF)
Static equivalent radial loadPorXo FrYo Fa
Single row / Tandem Back-to-back / Face-to-face
Xo Yo Xo Yo
0.5 0.42 1 0.84
When Por Fr with single-row or tandem
arrangement, Por Fr.
Load Internal Mass Reference dimensions Abutment and fillet dimensions
center free space
mm cm 3 kg
Single-row Single-row da db Da Db ras r1as
a (approx.) (approx.) d1 d2 D1 D2 min min max max max max
17.2 6.0 0.13 57.6 56.6 64.4 66.8 54.5 52.5 67.5 69.5 0.6 0.3
18.9 7.7 0.18 63.6 62.4 71.4 74.1 60.5 59.5 74.5 75.5 1 0.6
19.8 8.3 0.20 68.6 67.4 76.4 79.1 65.5 64.5 79.5 80.5 1 0.6
20.7 8.9 0.21 73.6 72.4 81.4 84.0 70.5 69.5 84.5 85.5 1 0.6
23.6 14 0.34 80.1 78.6 89.8 93.2 75.5 74.5 94.5 95.5 1 0.6
24.5 15 0.36 85.1 83.6 94.8 98.2 80.5 79.5 99.5 100.5 1 0.6
25.4 16 0.38 90.1 88.6 99.8 103.2 85.5 84.5 104.5 105.5 1 0.6
27.8 22 0.54 96.8 94.9 108.2 112.3 92 89.5 113 115.5 1 0.6
28.7 23 0.56 101.8 99.9 113.2 117.3 97 94.5 118 120.5 1 0.6
29.6 24 0.59 106.8 104.9 118.2 122.3 102 99.5 123 125.5 1 0.6
32.0 32 0.82 113.8 111.7 126.2 130.6 107 104.5 133 135.5 1 0.6
32.9 33 0.85 118.8 116.7 131.2 135.6 112 109.5 138 140.5 1 0.6
33.8 35 0.88 123.8 121.7 136.2 140.6 117 114.5 143 145.5 1 0.6
37.1 47 1.20 135.4 133.0 149.6 154.7 127 124.5 158 160.5 1 0.6
40.4 62 1.56 146.9 144.2 163.1 168.9 138.5 135.5 171.5 174.5 1.5 1
42.2 66 1.66 156.9 154.2 173.1 178.8 148.5 145.5 181.5 184.5 1.5 1
47.0 99 2.58 170.5 167.3 189.5 196.3 160 155.5 200 204.5 2 1
48.8 105 2.71 180.5 177.3 199.5 206.3 170 165.5 210 214.5 2 1
50.6 111 2.84 190.5 187.3 209.5 216.3 180 175.5 220 224.5 2 1
113