NTN - Precision Rolling Bearings

Main Spindle Bearings
Sa
Sb
r1a
Dynamic equivalent radial load
ra
PrXFrYFa
Da db
da
Db
Fa Fa
e
Fr Fr e
X Y X Y
1 0 0.4 Y2
Static equivalent radial load
Por0.5FrYoFa
Note that when PorFr, PorFr.
The values for e, Y2 and Yo are
given in the table below.
Abutment and fillet dimensions Load Factor Axial Mass
center
load factor
mm mm kg
da db Da Db Sa Sb ras r1as
min max max min min min min max max a e Y2 Y0 (approx.)
108.5 107.5 131.5 127.5 135.5 4 5 1.5 1.5 24.5 0.33 1.82 1.00 1.14
110 109 141.5 134 144 6 8 2 1.5 32.5 0.46 1.31 0.72 1.91
113.5 113.5 136.5 131.5 140.5 5 5 1.5 1.5 25 0.34 1.76 0.97 1.2
117 116 150 143 154 6 9 2 2 34.5 0.44 1.35 0.74 2.42
118.5 117.5 141.5 137 145.5 5 5 1.5 1.5 26.5 0.36 1.69 0.93 1.23
122 122 160 152 163 7 9 2 2 36.5 0.43 1.39 0.77 3.07
128.5 128.5 156.5 150 160 6 6 1.5 1.5 29.5 0.35 1.72 0.95 1.77
132 131 170 161 173 7 9 2 2 39 0.46 1.31 0.72 3.25
140 139 171.5 163.5 174 6 7 2 1.5 31.5 0.34 1.77 0.97 2.36
142 144 190 178 192 8 11 2 2 43.5 0.43 1.38 0.76 4.96
150 150 181.5 177 184 6 6 2 1.5 34 0.36 1.67 0.92 2.51
152 153 200 187 202 8 11 2 2 46 0.46 1.31 0.72 5.28
162 162 200 192 202 7 8 2 2 36.5 0.33 1.83 1.01 3.92
164 164 213 200 216 8 12 2.5 2 49.5 0.46 1.31 0.72 6.37
172 170.5 210 199 213.5 7 8 2 2 38.5 0.35 1.73 0.95 4.15
174 175 228 213 231 8 13 2.5 2 52.5 0.46 1.31 0.72 7.8
182 183 220 213 222 7 8 2 2 42.5 0.38 1.57 0.86 4.4
184 187 248 230 249 10 14 2.5 2 56 0.44 1.35 0.74 10.5
192 193 240 225 241 8 11 2 2 54 0.48 1.25 0.69 6.54
202 204 250 235 251 8 11 2 2 55 0.48 1.26 0.69 6.77
267