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634 - NTN


Deep groove ball bearing, radial contact, pressed steel cage, 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.


Technical datasheet

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Internal diameter (d) 4 mm
External diameter (D) 16 mm
Bearing/Inner ring width (B) 5 mm
Min fillet radius (rs) 0,3 mm
Radial clearance class CN
Mass 0,006 kg
Brand NTN
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Dynamic load (C) 1,94 kN
Static load (C0) 0,68 kN
Fatigue limit load (Cu) 0,023 kN
Coefficient f0 12.4
Nlim (oil) 44000 tr/min
Nlim (grease) 37000 tr/min
Min operating temperature (Tmin) -40 °C
Max operating temperature (Tmax) 120 °C


Min shoulder diameter IR (da min) 6 mm
Max shoulder diameter OR (Da max) 14 mm
Max shaft & housing fillet radius (ra max) 0,3 mm
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