7211BTN Angular Contact Ball Bearing 55x100x21mm

 7211BTN   Angular Contact Ball Bearing

 Inner Diameter (ID): 55  mm

Outer diameter (OD) 100 mm
Width/Height:  21 mm
Material:chrome steel(GCR15)
Number of Row: double rows
Seals type: open
Contact Angle:C=15°;AC=25°,A=30°; B=40°
Material: No mark:Steel ball(SUJ2); SN24:Ceramic ball(Si3N4)

7211BTN   Cage structure:

TYN:polyamide resin cage
TR : Phenolic resin cage

BRASS:Brass cage

7211BTN  Combination of mark:
SU:Universal combination (single row)
DU:Universal combination (double rows)
DB: Back-to-back combination
DF: Face-to-face combination
DT: Parallel combination
DBD.DFD.DTD:  Three rows
DBB.DFF.DBT.DFT.DTT: Four rows

7211BTN     Preloaded mark: 
EL: Micro preloaded
L : Light preload
M : Medium preloade
H : Heavy preloaded

7211BTN   Precision grade: 
P2 : ISO2;    
P4 : ISO4;  
P5 : ISO5
P3 : Special grade(Dimensional accuracy:ISO4,Rotation accuracy:ISO2)
p4Y: Special grade