I am looking for : References Interchanges

6311NR - NTN


Deep groove ball bearing, radial contact, pressed steel cage, snap ring & groove on outer diameter, open

The single row deep-groove ball bearing is the most popular bearing. It is available in a wide range of sizes with several possible options: sealing with shields or seals, presence of a retaining ring, varied clearances, several cage types, etc.


CAD file

Technical datasheet

PLEASE LOGIN to add products to your basket
Contact us


Internal diameter d 55 mm
External diameter D 120 mm
Bearing/Inner ring width(B) 29 mm
Min position Groove a min 3,86 mm
Max position groove a max 4,06 mm
Mini segment position Ca min 6,58 mm
Max segment position Ca max 6,88 mm
Min fillet radius rs 2 mm
Min fillet radius rNs 0,5 mm
Max bottom groove diameter D3 115,21 mm
Min groove width b min 3,1 mm
Max groove width b max 3,4 mm
Max bottom groove radius r0 max 0,6 mm
Max outside diameter of assembled stop ring D4 max 129,7 mm
Stop ring thickness f 2,82 mm
Snap ring reference R120
Radial clearance class CN
Mass 1,37 kg
Brand NTN
Product classification image


Dynamic load, C 79,5 kN
Static load, C0 45 kN
Fatigue limit load, Cu 3,5 kN
Coefficient f0 13.2
Nlim (oil) 6800 tr/min
Nlim (grease) 5800 tr/min
Min operating temperature, Tmin -40 °C
Max operating temperature, Tmax 120 °C
Characteristic cage frequency, FTF 0,384 Hz
Characteristic rolling element frequency, BSF 4,081 Hz
Characteristic outer ring frequency, BPF0 3,072 Hz
Characteristic inner ring frequency, BPFI 4,928 Hz


Min shoulder diameter IR da min 64 mm
Max shoulder diameter OR Da max 111 mm
Max shaft & housing fillet radius ra max 2 mm
Max fillet radius on segment side rNa max 0,5 mm
Min stop ring position diameter Db min 131,5 mm
Product classification image
Calcul factors image