Summary of Naming Methods for Bearing Designations

Basic code

Representing the basic type, structure, and size of bearings, it is the basis of bearing codes. Pre and post codes are supplementary codes added around the basic code when there are changes in the structural shape, size, tolerance, and technical requirements of bearings

Basic code

Type code - Size series code - Inner diameter code

The size series code of bearings is composed of a combination of the width (height) series code and diameter code of bearings

The diameter series refers to the outer diameter series corresponding to the same bearing inner diameter, which are 7, 8, 9, 0, 1, 2, 3, 4, 5, etc

A series of diameters with increasing dimensions in sequence.

The width series refers to the width dimension series of the same bearing diameter series, which include 8, 0, 1, 2, 3, 4, 5, 6, etc

A width series with increasing width dimensions in sequence

The thrust bearing corresponds to the width series of radial bearings with increasing height dimensions such as 7, 9, 1, and 2 in the height series

4 height series

Inner diameter code nominal inner diameter 10 to 17 examples 00 to 03 00=10 01=12 02=15 03=17 04 above x 5, 0.6 to 10 (non integer) and size series code separated by "/". Example 618/2.5 d=2.5mm, 1 to 9 (integer) for deep groove ball bearings and angular contact ball bearings 7, 8, 9 diameter series inner diameter and size series code separated by "/". Example: deep groove ball bearings 625, 618/5 d=5mm

Sealed bearings with flanges

Cylindrical roller bearings
N outer ring without blocking edge
NF outer ring single blocking edge
NN double row cylindrical roller bearing
NFP outer ring single edge, flat ring
NNU inner ring double row cylindrical roller bearing without retaining edge
NU inner ring without blocking edge
NJ inner ring single blocking edge
Needle roller bearings with double locking rings on the NA outer ring
NUJ inner ring without retaining edge, with diagonal retaining ring
NH inner ring single edge with diagonal retaining ring
NUP inner ring single edge, flat ring
RNU without inner ring
RN without outer ring
The meaning of pre code
F flange outer ring radial ball bearing (tightly used with d ≤ 10mm)
Detachable inner or outer rings of separable bearings
R bearings without separable inner or outer rings are only suitable for NA type needle roller bearings
WS thrust cylindrical roller bearing shaft ring
GS thrust cylindrical roller bearing race
KOW non ring thrust bearing
KIW non seat ring thrust bearing
LR with separable inner or outer rings and rolling element component bearings
K roller without cage assembly
Example:
6 2 03 ZZ C3 6 deep groove ball bearings 2 diameter series 2 03 inner diameter 17mm ZZ double dust cover C3 radial clearance
7 2 20 A DB C3 7 Finger Angular Contact Ball Bearing 2 Diameter Series 20 Inner Diameter 100mm A Finger Angle 30 degrees DB Back-to-Back Combination
1 2 06 K+H206X 1 finger self-aligning ball bearing 2 diameter series 06 inner diameter 30mm K taper 1:12 H206X finger tightening sleeve
32318H=NU318MCM N refers to cylindrical roller bearings 3 diameter series 18 inner diameter 90mm M refers to cages made of copper CM motor radial clearance CM often indicates being placed behind deep groove balls and cylindrical roller bearings
HR30207J HR high load bearing 3 tapered roller bearing 0 width series 2 diameter series 07 inner diameter 35mmJ refers to the outer ring rolling track diameter, angle, width and ISO standard
FAG code prefix
R without separable inner or outer ring bearings
GS. Thrust cylindrical roller bearing race GS.81112
K. Combination of rolling element and cage K.81108
WS. Thrust cylindrical roller bearing shaft ring K.81112
Post code
1: Internal structure A B C D E
C: 15 ° contact angle B: 40 ° contact angle E: 25 ° contact angle
Solid cage
TV: Glass fiber reinforced polyamide solid cage, guided by steel balls.
TVH: Glass fiber reinforced polyamide self-locking pocket type solid cage, guided by steel balls.
TVP: Glass fiber reinforced polyamide window type solid retainer, guided by steel balls.
TVP2: Glass fiber reinforced polyamide solid cage, roller guided.
TVPB: Glass fiber reinforced polyamide solid cage, inner ring guided (thrust roller bearing is shaft guided)
TVPB1: Glass fiber reinforced polyamide window solid cage, shaft guide (thrust roller bearing)
Universal paired bearings, can be installed in any (series, face-to-face or back-to-back) pairing, with rear codes UA, UO, UL
UA has small axial clearance when installing bearings face-to-face or back-to-back.
UO has no clearance when installing bearings face to face or back-to-back.
UL has slight pre interference when installing bearings face-to-face or back-to-back.
Without holder
V: Fully install rolling element bearings. Example: NU207V
VT: Fully loaded rolling element bearings with isolation balls or rollers. Example: 51120VT
Special technical materials
F. Manufacturing technical conditions for consecutive numbering. Example: F80 bearing internal and external diameter tolerances and radial clearance compression.
K. Technical conditions for continuous numbering inspection. Example: Compression of inner and outer diameter tolerances for K5 bearings.
The convexity at both ends of the ZB2 rolling needle is greater than the general technical requirements.
Cylindrical rollers with convexity and a diameter greater than 80mm.
Sealed against dust
RSR bearing with dust ring on one side
RSR bearings with dust rings on both sides
ZR bearing with dust cover on one side
. 2ZR bearings with dust covers on both sides
The ZRN bearing is equipped with a dust cover on one side and a stop groove on the outer ring on the other side
The. 2ZRN bearing is equipped with dust covers on both sides and a stop groove on the outer ring
NSK pre code
F: Deep groove bearings with flange outer ring are suitable for d<10mm F605
HR: Blame on tapered roller bearing HR30207 J
MF: Special size protrusion outer circle deep groove ball bearing d ＜ 10mm MF52
MR: Deep groove ball bearings with specific dimensions d ＜ 10mm MR31
E4: Outer ring with oil groove oil hole
Post code
A: Angular contact ball bearing, contact angle 30 ° 7202A
ER: Low noise
CM: Suitable for motors with low noise
A5: Angular contact ball bearing contact angle 25 °
B: Angular contact ball bearing with a contact angle of 40 °
C: Angular contact ball bearing, contact angle 1 5 °
C: Contact angle of tapered roller bearing 20 °
D: Cone roller bearing, contact angle 28 °
E: High load cylindrical roller bearings
H: High load thrust self-aligning roller bearings
C. CA.CD high load self-aligning roller bearings
CA with brass solid cage
CD with stamped holder
C. CA (with brass solid cage) and CD (with stamped cage) are both high load self-aligning roller bearings
material
Example of M copper alloy solid cage: NU230
EM M rear copper alloy L1 G1 G2
T-synthetic resin retainer (TY) Example: NU206 ET
W stamped cage (steel)
H stainless steel
V without holder
Sealing ring and dust cover
Z ZS dust cover with steel plate on one side
ZZ ZZS dust cover with steel plates on both sides
D DU with contact rubber sealing ring on one side
DD DDU with contact rubber sealing rings on both sides
V-side with non-contact rubber sealing ring
VV with non-contact rubber sealing rings on both sides
N outer ring with stop groove
Z single-sided dust cover (iron)
RS single-sided sealing ring, black rubber cover
E4 outer ring with oil groove and oil hole
There are cuts or oil ports on the E-ring
Special specifications:
S11 self-aligning roller bearing, with a temperature limit of below 200 ° C for use
X29 is limited to temperatures below 250 ° C for use
X28 is limited to temperatures below 200 ° C for use
X26 is limited to temperatures below 150 ° C for use
NTN prefix supplementary code
TK high-speed bearing
High temperature bearings with TS size stabilization treatment
M-surface coated bearings
F stainless steel bearing
H high-speed steel bearing
N special material bearings
TM special heat treated long-life bearings
EC expansion compensation bearing
ET ET tapered roller bearings