K: Tapered hole bearing, taper 1: 12 (except external spherical ball bearing). For example: 12 10K
K30: Tapered hole bearing with taper of 1: 30. For example: 24 122 K30
R: The bearing outer ring has a stop flange (flange outer ring), which is not suitable for radial ball bearings with inner diameter less than 10 mm ... Example 30307R
N: There is a stop groove on the bearing outer ring. For example: 62 10N
NR: The bearing outer ring has a stop groove and a stop ring. For example: 62 10 NR
-RS: One side of the bearing is provided with a skeleton rubber sealing ring (contact type). For example: 62 10-RS
-2RS: There are skeleton rubber sealing rings on both sides of the bearing (contact type). For example: 62 10-2RS. (Note: the contact sealing ring of NSK bearing is indicated as DDU)
-RZ: There is a skeleton rubber sealing ring on one side of the bearing (non-contact). For example: 62 10-RZ
-2RZ: There are skeleton rubber sealing rings on both sides of the bearing (non-contact). For example: 62 10-2RZ
-Z: One side of the bearing is provided with a dust cover. For example: 62 10-Z
-2Z: There are dust caps on both sides of the bearing. For example: 62 10-2Z. (Note: NSK is represented by ZZ)
-RSZ: One side of the bearing has a skeleton rubber sealing ring (contact type), and the other side has a dust cover. For example: 62 10-RSZ
-RZZ: One side of the bearing has a skeleton rubber sealing ring (non-contact) and the other side has a dust cover. For example: 62 10-RZZ
-ZN: one side of the bearing is provided with a dust cover, and the outer ring on the other side is provided with a stop groove. For example: 62 10-ZN
-ZNR: one side of the bearing has a dust cover, and the outer ring on the other side has a stop groove and a stop ring. For example: 62 10-ZNR
-ZNB: one side of the bearing has a dust cover, and the outer ring on the same side has a stop groove. For example: 62 10-ZNB
-2ZN: There are dust covers on both sides of the bearing, and the outer ring has a stop groove. For example: 62 10-2ZN
-U: thrust ball bearing with spherical washer.
-FS: One side of the bearing is sealed with a felt ring. Example: 6203-FS
-2FS: Both sides of the bearing are sealed with felt rings. Example: 6206-2FSWB
-LS: One side of the bearing is provided with a skeleton rubber sealing ring (contact type, the ring is not grooved).
-2LS: Both sides of the bearing are provided with skeleton rubber sealing rings (contact type, rings are not slotted). For example: NNF 50 12-2LSNV
PP: Both sides of the bearing are equipped with soft rubber sealing rings. For example: NATR 8PP
-2K: Double-row tapered hole bearing with taper of 1: 12.
D
Double row angular contact ball bearing, double inner ring, contact angle 45.
Double-row tapered roller bearing, without inner spacer, without grinding end face.
DC: Double row angular contact ball bearing, double outer ring. For example: 3924-2KDC
D 1: Double-row tapered roller bearing, without inner spacer, with end face ground.
DH: One-way thrust bearing with two races
DS: One-way thrust bearing with two collars
N 1: The bearing outer ring has a locating notch.
N2: The bearing outer ring has two or more symmetrical locating notches.
N4: n+N2 locating groove and stopping groove are not on the same side.
N6: n+N2 positioning notch and stop groove are on the same side.
P: Self-aligning roller bearing with double and half outer rings
PR: Like P, there is a spacer between the two outer rings.
S
The surface of bearing outer ring is spherical (except spherical ball bearing)
Adjustable clearance (needle bearing)
WB: wide inner ring bearing (double-sided width); WB 1-single width
WC: wide outer ring bearing
SC: radial bearing with cover
X: The outer ring surface of needle roller bearing is cylindrical.
Z: needle roller combined bearing with dust cover. For example: NK 25 Z
ZH: Thrust bearing with dust cover on the seat ring.
ZS: thrust bearing, collar with dust cover.