Engineering
Prefix Suffix Guide
CHARACTERISTICS
NTN
SKF
FAG
TORR
NSK
Closures
One Non-Contact seal
LB
RZ
RSD
N/A
V
Two Non-Contact seals
LLB
2RZ
1RSD
N/A
VV
One Contact seal
LU
RS1
RSR
P
DU
Two Contact seal
LLU
2RS1
2RSR
PP
DDU
One Shields
Z
Z
Z
D
Z
Two Shields
ZZ
ZZ
2Z
DD
ZZ
One Snap Ring
NR
NR
NR
G
NR
Precision Classes
AB E C 3
P6
P6
P6
M*
P A3
AB E C 5
P5
P5
P5
V*
P5, PA5
AB E C 7
P4
P4
P4
MM*
P4, PA7
AB E C 9
P2
PA9A
P2
MMX*
P2, PA7
Spherical Features
Tapered Bore
K
K
K
K
K
Oil Groove
D1
W33
S
W33
E4
Shaker Screens
U AVS
CACM2/W502
F80
W800
U-15-VS

CHARACTERISTICS
NTN
SKF
FAG
TORR
NSK
Contact Angles
15 deg
C
C
C
2*
C
30 deg
NO SYMBOL
AC
E(25deg)
3=(25deg)
A, (A5=25deg)
40 deg
B
B
B
WN
B
Preload
Extra Light
GL
G0
U0
UX
C2
Light
GN
GA
UL
UL
L, C7
Medium
GM
GB
UM
UM
M, C8
Heavy
GH
GC
UH
H, C9
Cage
Phenolic
T1
TP
TA, TB, TH, TP
CR
T
Pressed Brass
Y
Y
MP
NO SYMBOL
Y
Polyamide
T2
TN, P
TN
PRB/PRC
TY
Bronze
L1
M
M, MP
MBR
CAM, M
Nylon
T2
TN9
T, TV
CF
TY
Pressed Steel
J
J
J
C, CD
W
Duplex
Universal ground
G
G**
U
SU
G

 

Internal Modification Code
Cage Code
Seal Shield Code
Raceaway Configuration Code
Duplex Arrangement Code
Internal Clearance / preload Code
Tolerance Code
Lubrication Code
U:
Internationally interchangeable tapered roller bearings

R:
Non-Internationally interchangeable tapered roller bearings

ST:
Low torque tapered roller bearings

HT:
High Axial load use cylindrical roller bearings
L1:
High Strength machine brass cage

F1:
Machined carbon steel cage

G1:
High Strength machined brass rivet less cage w/square bolt

G2:
Pin type cage

J:
Pressed steel cage

T2:
Plastic mold cage
LLB:
Sythetic rubber seal (Non-contact type)

LLU:
Synthetic rubber seal (contact type)

LLH:
Synthetic rubber seal (low-torque type)

ZZ:
Steel shield
K:
Tapered inner ring bore , standared tapered ratio 1:12

K30:
Tapered inner ring bore, standard taper ratio 1:30

N:
Snap ring groove

NR:
Snap ring groove with snap ring

D:
Lubrication hole/lubrication groove
DB:
Back to back arrangement

DF:
Face to face arrangement

DT:
Tandem arrangement

D2:
Two matched paired bearings

G:
Flush ground

+a:
Spacer (a =spacer's standard width dimensions)
C2:
Internal clearance less than normal

(CN):
Normal Clearance

C3:
Internal Clearance greater than normal

C4:
Internal clearance greater than C3

C5:
Internal clearance greater than C4

CM:
Radial internal clearance for electric motor use

/GL:
Light preload

/GN:
Normal preload

GM:
Medium preload

GH:
Heavy preload
P6:
JIS Class 6

P5:
JIS Class 5

P4:
JIS Class 4

P2:
JIS Class 2

2:
Inch series tapered roller bearing (ABMA Class 2)

3:
Inch series tapered roller bearing (ABMA Class 3)

0:
Inch series tapered roller bearing (ABMA Class 0)

00:
Inch series tapered roller bearing (ABMA Class 00)
/2A:
Shell Alvania 2 grease

/3A:
Shell Alvania 3 grease

/8A:
Shell Alavania EP2 grease

/5k:
MULTEMPSRL

/LX11:
Barierta JFE552

/LP03:
Solid grease (for use with solid grease bearings)

Supplementary Prefix code
Special Application ./ material/ heat treatment
4T-
4 T Tapered roller bearings
ET-
E T Tapered roller bearings
E-
Carburized alloy steel bearings
F-
Stainless steel Bearings
HL-
HL (High lubrication) roller bearings
TS2-
Dimension stabilised bearing for high temperature use (to 160 deg C)
TS3-
Dimension stabilised bearing for high temperature use (to 200 deg C)
TS4-
Dimension stabilised bearing for high temperature use (to 250 deg C)