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21306VK - SNR


Spherical roller bearing, pressed steel cage, tapered bore 1:12

The spherical roller bearing withstands significant loads and misalignments. This type of roller bearing is well adapted to harsh operating conditions: impacts or vibrations (crushers, vibrating screens, heavy handling, etc.). With the ULTAGE design, NTN-SNR offers as standard, unsurpassed endurance and longevity.


CAD file

Technical datasheet

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Internal diameter d 30 mm
External diameter D 72 mm
Bearing/Inner ring width(B) 19 mm
External diameter inner ring d2 40,8 mm
Inner diameter outer ring D1 59,7 mm
Min fillet radius rs 1,1 mm
Number of lubrication holes 0
Groove width (b) 0 mm
Hole diameter (k) 0 mm
Associated sleeve reference H306
Coef e 0.28
Lower axial load coef (Y1) 2.45
Upper axial load coef (Y2) 3.64
Static axial load coef (Y0) 2.39
Radial clearance class CN
Mass 0,384 kg
Brand SNR
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Dynamic load, C 64,6 kN
Static load, C0 52,1 kN
Fatigue limit load, Cu 6,1 kN
Reference thermal speed (Nref) 7800 tr/min
Mechanical Limit Speed Nlim 12000 tr/min
Min operating temperature, Tmin -40 °C
Max operating temperature, Tmax 200 °C
Characteristic cage frequency, FTF 0,405 Hz
Characteristic rolling element frequency, BSF 4,973 Hz
Characteristic outer ring frequency, BPF0 4,856 Hz
Characteristic inner ring frequency, BPFI 7,144 Hz


Max shoulder diameter IR da max 0 mm
Min shoulder diameter IR da min 37 mm
Min diameter for Sleeve db 33 mm
Min length fro Sleeve Ce 6 mm
Max shoulder diameter OR Da max 65 mm
Max shaft & housing fillet radius ra max 1 mm
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