A: Non-loaded ball gap
CB: A specific axial clearance
C2: Axial clearance is less than ordinary group
C3: Axial clearance is more than ordinary group
D: Some inner ring
HT51: High-temperature grease, the temperature range of -30 to 175 degrees
J1: Stamping steel frame, ball guide
M: Machine cut brass cage, ball guide
MA: Machine cut brass cage, outer guide
MT33: Lithium-based grease, the temperature range of -30 to 120 degrees
N: With stop groove on outer ring
NR: With snap ring and stop groove on outer ring
P5: Dimensional accuracy and precision of rotation in line with ISO tolerance class 5
P6: Dimensional accuracy and precision of rotation in line with ISO tolerance class 6
P62:P6+C2
P63:P6+C3
TN9: Card-type glass fiber reinforced nylon 6,6 cage, ball guide
2RS1: With nitrile rubber seals of steel skeleton on both sides
2Z: With stamping steel shield on both sides
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