31306.A - SNR


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.


3D file

Technical datasheet

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Internal diameter (d) 30 mm
External diameter (D) 72 mm
Bearing/Inner ring width (B) 19 mm
Outer ring width (C ) 14 mm
Total width (T) 20,75 mm
External diameter inner ring d1 52,4 mm
Charge load application point a 18,6 mm
Min fillet radius (rs) 1,5 mm
Min fillet radius r1s 1,5 mm
Coef (e) 0.83
Upper axial load coef (Y2) 0.73
Static axial load coef (Y0) 0.4
Mass 0,392 kg
ISO 355 reference T7FB030
Brand SNR
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Dynamic load (C) 54,7 kN
Rating life coefficient, A2 1
Static load (C0) 59,9 kN
Fatigue limit load (Cu) 7,3 kN
Reference thermal speed (Nref) 6100 tr/min
Mechanical Limit Speed (Nlim) 10000 tr/min
Min operating temperature (Tmin) -40 °C
Max operating temperature (Tmax) 120 °C
Characteristic cage frequency, FTF 0,421 Hz
Characteristic rolling element frequency, BSF 5,404 Hz
Characteristic outer ring frequency, BPF0 6,735 Hz
Characteristic inner ring frequency, BPFI 9,265 Hz


Max shoulder diameter IR (da max) 39 mm
Min IR shoulder diameter (db min) 38,5 mm
Min shoulder diameter OR Da min 55 mm
Max shoulder diameter OR (Da max) 63,5 mm
Min OR shoulder diameter Db min 68 mm
Min clearance Ca 3 mm
Min clearance Cb 6,5 mm
Max fillet radius ra max 1,5 mm
Maxi fillet radius r1a 1,5 mm
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