684ZZ Bearing 4X9X4 mm ABEC-5 10 PCS Miniature 684Z Ball Bearings 684 ZZ 618/...

Description

684ZZ Bearing 4X9X4 mm ABEC-5 (10 PCS) Miniature 684Z Ball Bearings 684 ZZ 618/4ZZ Hobby Emax Motor Quadcopter L-940ZZ Bearing
Structure of bearing model 684zz :Inner & outer ring, cage, steel balls, grease, shield
Our bearing is pre-lubricated with grease,The main purpose of lubrication is to reduce friction that may cause premature failure.
Nylon plastic retainers,Use for high speed rotation and low noise levels，The ZZ shield cannot be removed
Bearing is made of chrome steel material,The typical surface hardness for bearing components made from this material ranges from 60-64 on the Rockwell hardness C scale (Rc).
Bore Dia (d): 4.000 mm Outer Dia (D): 9.000 mm Width (B): 4.000 mm
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
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