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4T-30208 - NTN

4T-30208

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.

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Technical datasheet

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Specs

PRODUCT DEFINITION

d - Internal diameter 40 mm
D - External diameter 80 mm
B - Bearing/Inner ring width 18 mm
C - Outer ring width 16 mm
T - Total width 19,75 mm
d1 - External diameter inner ring 58 mm
a - Charge load application point 16,5 mm
rs - Min fillet radius 1,5 mm
r1s - Min fillet radius 1,5 mm
Mass 0,431 kg
ISO 355 reference T3DB040
Brand NTN
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PRODUCT PERFORMANCE

C - Dynamic load 68 kN
C0 - Static load 67 kN
Cu - Fatigue limit load 8,2 kN
A2 - Rating life coefficient 1
e - Coefficient 0.37
Y0 - Static axial load coefficient 0.88
Y2 - Upper axial load coefficient 1.6
Nlim - Oil lubrication limit speed 6600 tr/min
Nlim - Grease lubrication limit speed 4900 tr/min
Tmin - Min operating temperature -40 °C
Tmax - Max operating temperature 120 °C
FTF - Characteristic cage frequency 0,419 Hz
BSF - Characteristic rolling element frequency 5,818 Hz
BPFO - Characteristic outer ring frequency 7,12 Hz
BPFI - Characteristic inner ring frequency 9,88 Hz

ABUTMENT

da max - Max shoulder diameter IR 49 mm
db min - Min IR shoulder diameter 48,5 mm
Da min - Min shoulder diameter OR 69 mm
Da max - Max shoulder diameter OR 71,5 mm
Db min - Min OR shoulder diameter 75 mm
Ca - Min clearance 3 mm
Cb - Min clearance 3,5 mm
ra max - Max fillet radius 1,5 mm
r1a - Max fillet radius 1,5 mm
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