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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 DIMENSIONS

Internal diameter d 40 mm
External diameter D 80 mm
Bearing/Inner ring width(B) 18 mm
Outer ring width (C ) 16 mm
Total width (T) 19,75 mm
External diameter inner ring d1 58 mm
Charge load application point a 16,5 mm
Min fillet radius rs 1,5 mm
Min fillet radius r1s 1,5 mm
Coef e 0.37
Upper axial load coef (Y2) 1.6
Static axial load coef (Y0) 0.88
Mass 0,431 kg
ISO 355 reference T3DB040
Brand NTN
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PRODUCT PERFORMANCE

Dynamic load, C 68 kN
Rating life coefficient, A2 1.0
Static load, C0 67 kN
Fatigue limit load, Cu 8,2 kN
Nlim (oil) 6600 tr/min
Nlim (grease) 4900 tr/min
Min operating temperature, Tmin -40 °C
Max operating temperature, Tmax 120 °C
Characteristic cage frequency, FTF 0,419 Hz
Characteristic rolling element frequency, BSF 5,818 Hz
Characteristic outer ring frequency, BPF0 7,12 Hz
Characteristic inner ring frequency, BPFI 9,88 Hz

ABUTMENT

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