NTN - Precision Rolling Bearings

Main Spindle Bearings
ras
ras
ras
daDa
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
0.68 1 0 0.41 0.87 1 0.92 0.67 1.41
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 0.38 1 0.76
When Por Fr with single-row or tandem
arrangement, Por Fr.
Load Mass Reference dimensions Abutment and fillet dimensions Part
center
number
mm kg mm
Single-row da db Da ras r1as
a (approx.) d1 d2 D1 min min max max max
20.3 0.14 56.9 56.0 65.0 54.5 52.5 67.5 0.6 0.3 2LA-BNS910ADLLB
22.3 0.19 62.6 61.7 72.1 60.5 59.5 74.5 1 0.6 2LA-BNS911ADLLB
23.5 0.21 67.6 66.7 77.1 65.5 64.5 79.5 1 0.6 2LA-BNS912ADLLB
24.7 0.22 72.6 71.7 82.1 70.5 69.5 84.5 1 0.6 2LA-BNS913ADLLB
27.9 0.38 79.2 78.3 90.2 75.5 74.5 94.5 1 0.6 2LA-BNS914ADLLB
29.1 0.39 84.2 83.3 95.2 80.5 79.5 99.5 1 0.6 2LA-BNS915ADLLB
30.3 0.41 89.2 88.3 100.2 85.5 84.5 104.5 1 0.6 2LA-BNS916ADLLB
33.0 0.59 96.0 95.0 108.6 92 89.5 113 1 0.6 2LA-BNS917ADLLB
34.2 0.62 100.9 100.0 113.6 97 94.5 118 1 0.6 2LA-BNS918ADLLB
35.4 0.65 105.9 105.0 118.6 102 99.5 123 1 0.6 2LA-BNS919ADLLB
38.1 0.87 111.9 110.9 127.3 107 104.5 133 1 0.6 2LA-BNS920ADLLB
171