Deep groove ball bearings are widely used in many industries. It mainly bears radial load and small axial load. Usually the material of the ring and ball is GCr15 (similar as AISI52100) chrome steel、AISI440c stainless steel or 20# (similar as AISI1020) carbon steel. For carbon steel bearings, after chemical carburization treatment, with a treated depth of 0.50~0.90mm, the surface hardness of the ring is about HRC58-61, while the cage is made of brass band (H62)、refined steel band (SPCC BQB402)、0.8F cold rolling steel band、stainless steel band AISI302、enhanced engineering plastics or phenol aldehyde. Shield is made of steel band (SPCC, ICr18Ni9) or cold rolling steel band. Seal is usually made of nitrile rubber, while fluorocarbon, silicone and teflon seals are commonly specified for high temperatures.

1. Size Designations

60xx; 62xx; 68xx; 69xx; 618xx ; 619xx 

2. Designs, types and features
Z=Single shield；ZZ=Double shields；
RS=Single seal (rubbing seal); 2RS=Double seals

F=Flanged outer ring; W=Extended inner ring; 
FW=Flanged outer/Extended inner rings；

N=with snap ring groove in outer ring；NR=with snap ring groove and ring

5. Clearance

/C2: less than nominal clearance

/C0: nominal clearance, omitted in designation

/C3: larger clearance than C0

/C4: larger clearance than C3

/C5: larger clearance than C4

/C9: non-standard

6. Tolerance Class

/P0: equals grade ABEC-1, omitted in designation

/P6: equals grade ABEC-3

/P5: equals grade ABEC-5

/P4: equals grade ABEC-7

/P2: equals grade ABEC-9

7. Vibration and Noise
According to its accelerating grade, the vibration and noise of bearings can be divided into Z1, Z2, Z3 three groups. According to its speed grade, they can also be divided into V1, V2, and V3 Groups.