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31308A - SNR

31308A

Tapered roller bearing, pressed steel cage

The single row tapered roller bearing is available in metric dimensions (ISO 355 and JIS B 1512 standards) and in inches (ABMA standard, metric series including J). The single row in tapered roller bearing range, is the most widely used and is generally mounted in opposition.

Documentation

Product information

PRODUCT DEFINITION
BrandSNR
d - Internal diameter40 mm
D - External diameter90 mm
B - Bearing/Inner ring width23 mm
C - Outer ring width17 mm
T - Total width25,25 mm
d1 - External diameter inner ring66,7 mm
a - Charge load application point29 mm
rs - Min fillet radius2 mm
r1s - Min fillet radius1,5 mm
Mass0,728 kg
ISO 355 referenceT7FB040
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PRODUCT PERFORMANCE
C - Dynamic load89,2 kN
A2 - Rating life coefficient1
C0 - Static load96,4 kN
Cu - Fatigue limit load11,8 kN
e - Coefficient0.83
Y0 - Static axial load coefficient0.4
Y2 - Upper axial load coefficient0.73
N ref - Reference thermal speed5000 tr/min
N lim - Mechanical Limit Speed8000 tr/min
Tmin - Min operating temperature-40 °C
Tmax - Max operating temperature120 °C
BEARING FREQUENCIES
BPFO - Over rolling frequency on outer ring (60 rpm)6,735 Hz
BPFI - Over rolling frequency on inner (60 rpm)9,265 Hz
BSF - Over rolling frequency on rolling element (60 rpm)5,402 Hz
BRF - Rotational frequency – rolling element (60 rpm)2,701 Hz
FTF - Rotational frequency - cage (60 rpm)0,421 Hz
ABUTMENT
da max - Max shoulder diameter IR51 mm
db min - Min IR shoulder diameter49 mm
Da min - Min shoulder diameter OR71 mm
Da max - Max shoulder diameter OR81 mm
Db min - Min OR shoulder diameter86 mm
Ca - Min clearance4 mm
Cb - Min clearance8 mm
ra max - Max fillet radius2 mm
r1a - Max fillet radius1,5 mm
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