684ZZ Bearing 4X9X4 mm ABEC-5 (10 PCS) Miniature 684Z Ball Bearings 684 ZZ 618/4ZZ Hobby Emax Motor Quadcopter L-940ZZ Bearing

By Brand : FUSHIBEARING

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Miniature ball bearings have a wide range of functions. Bearings are devices that allow parts to move relative to one another in a constrained fashion. The two most common types of bearings are plain bearings and rolling bearings. The most well-known of the rolling variety of bearings is the ball. A ball bearing can be highly effective in reducing friction between two parts that need to move freely. 684-ZZ Bearing specifications (metric) Bearing type: Shielded Bore Dia (d): 4.000 mm Outer Dia (D): 9.000 mm Width (B): 4.000 mm Radius (min) (rs): 0.10 mm Dynamic load rating (Cr): 545 N Static load rating (Cor): 182 N Max speed (Grease): 53,000 rpm Max speed (Oil): 63,000 rpm Max. shaft shoulder dia. inner (Ui): 5.2 mm Min. housing shoulder dia., Outer (Uo): 8.1 mm Ball quantity: 7 Ball dia (Dw): 1.588 mm Weight (g): 1.0 grams Precision: ABEC-5 Standard clearance: C0/(K25) Material: 52100 chrome steel