CN: A general group of radial clearances; usually used only in combination with the following letters to indicate narrower or offset clearance ranges

H: A narrow gap, equal to the upper half of the original gap.

L: A narrow gap, which corresponds to the lower half of the original gap.

P: The offset clearance range corresponds to the composition of the upper half of the original clearance range and the lower half of the lower group of clearance ranges.

The above letters are also applicable in combination with the following gap groups: C2, C3, C4, and C5, such as C2.

C2: Radial clearance is smaller than normal group

C3: Radial clearance is larger than normal group

C4: Radial clearance greater than C3

C5: Radial clearance greater than C4

DB: Two single row deep groove ball bearings paired back to back

DF: Two single row deep groove ball bearings paired face to face

DT: Two single row deep groove ball bearings paired in series

E: Reinforcement Design

GJN: Polyurea grease, NLGI consistency 2, temperature range - 30 to + 150 degrees (standard filling)

GXN: Polyurea grease, NLGI consistency 2, temperature range - 40 to + 150 degrees (standard filling)

J: Stamping steel cage

LHT 23: Lithium base grease, NLGI consistency 2, temperature range - 50 to + 140 degrees (standard filling)

LT: Lithium-based grease, NLGI consistency 2, temperature range - 55 to + 110 degrees (standard filling)

LT10: Lithium-based grease, NLGI consistency 2, temperature range - 50 to + 90 degrees (standard filling capacity)

M: Machined brass cage, steel ball guide. Different designs and materials are digitally identified after M, such as M2.

MA: Machine-cut brass cage, outer ring guide

MB: Machined brass cage, inner ring guide

MT33: Lithium-based grease, NLGI consistency 3, temperature range - 30 to + 120 degrees (standard filling)

MT47: Lithium-based grease, NLGI consistency 2, temperature range - 30 to + 110 degrees (standard filling)

N: Outer ring with stop groove

NR: Outer Ring with Stop Groove and Stop Ring

N1: There are grooves on the side of the outer ring (used to cooperate with the stop device to prevent the outer ring from turning)

P5: Dimension accuracy and rotation accuracy meet ISO tolerance level 5

P6: Dimension accuracy and rotation accuracy meet ISO tolerance level 6

P52:P5+C2

P62:P6+C2

P63:P6+C3

RS1: Contact Seal Ring of Nitrile Butadiene Rubber (NBR) with Steel Frame on One Side

RSH: Contact Seal Ring of NBR with Steel Frame on One Side

RSL: NBR low friction sealing ring with steel skeleton on one side

RZ: NBR low friction sealing ring with steel skeleton on one side

TH: Fiber reinforced phenolic resin cage (card type)

TN: Injection Molded Nylon Cage

TN9: Injection Glass Fiber Reinforced Nylon 6,6 Cage

VL0241: Alumina coating on the outer surface of the outer ring, with insulation capacity up to 1000VDC

VL2071: Alumina coating on the outer surface of inner ring, with insulation capacity up to 1000VDC

WT: Polyurea grease, NLGI consistency 2, temperature range - 40 to + 160 degrees (standard filling)

Y: Stamping copper cage

Z: Stamping steel dust cover on one side

ZNR: Outer ring with stop groove and stop ring, the other side of stop groove with punched steel dust cover

2RS1: Contact Sealing Ring of Nitrile Butadiene Rubber (NBR) with Steel Frame on Both Sides

2RSH: Contact Sealing Ring of NBR with Steel Frame on Both Sides

2RSL: NBR low friction sealing ring with steel skeleton on both sides

2RZ: NBR low friction sealing ring with steel skeleton on both sides

2Z: Dust-proof cover with stamped steel on both sides

2ZNR: Outer ring with stop groove and stop ring, both sides with punched steel dust cover