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High precision angular contact ball bearings

7909UADG/GMP42 - NTN

7909UADG/GMP42

In the ball bearing and high precision bearing ranges, the high precision angular contact ball bearing solves the maximum reliability constraints with increased performance in terms of rigidity, speed, capacity and precision. This bearing is recommended for demanding applications in terms of precision such as machine tool spindles. NTN is getting sub-ranges dedicated to requirements of speed, sealing, specific greasing, etc.

Documentation

Product information

PRODUCT DEFINITION
BrandNTN
d - Internal diameter45 mm
D - External diameter68 mm
B - Bearing/Inner ring width12 mm
d1 - External diameter inner ring52,7 mm
d2 - External diameter inner ring50,8 mm
D1 - Inner diameter outer ring60,4 mm
D2 - Inner diameter outer ring64 mm
a - Charge load application point19,2 mm
α - Contact angle25 °
rs - Min fillet radius0,6 mm
r1s - Min fillet radius0,3 mm
Precision classP42
Mass0,12 kg
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PRODUCT PERFORMANCE
C - Dynamic load18,8 kN
C0 - Static load14,1 kN
f0 - Coefficient16.1
N lim - Oil lubrication limit speed29000 tr/min
N lim - Grease lubrication limit speed18000 tr/min
Preload levelGM
Preload value0,345 kN
Tmin - Min operating temperature-20 °C
Tmax - Max operating temperature120 °C
ABUTMENT
da min - Min shoulder diameter IR49,5 mm
Da max - Max shoulder diameter OR63,5 mm
Db max - Max OR shoulder diameter65,5 mm
r1a - Max fillet radius0,3 mm
ra max - Max shaft & housing fillet radius0,6 mm
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