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Single row deep groove ball bearings

6988 - NTN

6988

The single row deep-groove ball bearing is the most popular bearing. It is available in a wide range of sizes with several possible options: sealing with shields or seals, presence of a retaining ring, varied clearances, several cage types, etc.

Documentation

Product information

PRODUCT DEFINITION
BrandNTN
d - Internal diameter440 mm
D - External diameter600 mm
B - Bearing/Inner ring width74 mm
rs - Min fillet radius4 mm
Radial clearance classCN
Mass60 kg
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PRODUCT PERFORMANCE
C - Dynamic load405 kN
C0 - Static load615 kN
Cu - Fatigue limit load18 kN
f0 - Coefficient16.4
N lim - Oil lubrication limit speed1000 tr/min
N lim - Grease lubrication limit speed890 tr/min
Tmax - Max operating temperature120 °C
ABUTMENT
da min - Min shoulder diameter IR456 mm
Da max - Max shoulder diameter OR584 mm
ra max - Max shaft & housing fillet radius3 mm
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