Characteristics of TCB bearings > Bearing designation

Bearing designations
Bearing designation represents the features of the bearing including type, dimension, precision, gauge and other specifications. It comprises basic designation and supplementary symbols.
Basic designation represents bearings basic type, design and dimensions. Supplementary symbols are used to identify designs or variants which differ in some way from original or the current standard designs.
For example
 

Bearing designation

All TCB standard bearings have a characteristic basic designation, which for almost all standard bearing types are shown in the following table




 
Supplementary symbols
Supplementary symbols appear as "prefix" or "suffix", which generally demonstrated by letters, of which the meanings are shown as follows:

Prefix
S    Stainless steel bearing

Suffix
A    30o contact angle
AC    25o contact angle
B    40o contact angle
C    15o contact angle
C2    Bearing internal clearance smaller than CN
C3    Bearing internal clearance greater than CN
C4    Bearing internal clearance greater than C3
C5    Bearing internal clearance greater than C4
CA    Axial internal clearance will be smaller than CB when arranged DB or DF
CB    Axial internal clearance will be normal when arranged DB or DF
CC    Axial internal clearance will be greater than CB when arranged DB or DF
CM    Radial internal clearance for electric motor bearings
CN    Normal internal clearance
CT    Radial clearance of electric motor bearing greater than CM
CV    Modified internal design, full complement roller bearings
DA    Modified snap ring groove in the outer ring, two-piece inner ring held together by a retaining ring
DB    Two bearings matched for mounting in a back-to-back arrangement
DF    Two bearings matched for mounting in a face-to-face arrangement
DT    Two bearings matched for mounting in a tandem arrangement
E    Optimized internal design
F    Face-to-face
FA    Machined steel cage, outer ring centred
G    With re-lubricated groove and nipple in the outer ring
HT    Grease fill for high operating temperature
J    Pressed steel cage
K    Taper 1:12
LT    Grease fill for low operating temperature
M    Machine brass cage,
MA    Machine brass cage, outer ring centred
N    Snap ring groove in the outer ring
N1    One locating slot (notch) in the outer ring
N2    Two locating slots (notches) in the outer ring, positioned at 180o to each other
NR    Snap ring groove in the outer ring, with snap ring
P4    Dimensional and running accuracy to ISO tolerance class 4
P4A    Dimensional accuracy to ISO class 4, running accuracy better than ISO class 4 (UP)
P4B    Dimensional accuracy to ISO class 5, running accuracy to ISO class 4 (SP)
P5    Dimensional and running accuracy to ISO tolerance class 5
P52    P5+C2
P6    Dimensional and running accuracy to ISO tolerance class 6
P62    P6+C2
P63    P6+C3
P6X    Dimensional and running accuracy to ISO tolerance class 6X
R3    Triple-lips seal
RS    Rubber (NBR) seal on one side of the bearing (contact type)
RSR    Rubber (NBR) seal on one side of the bearing (without seal groove in inner ring, contact type)
RZ    Low friction, rubber (NBR) seal on one side of the bearing
T    Tandem arrangement
TN    Injection moulded polyamide cage
TN9    Injection moulded glass fibre reinforcement polyamide 6,6 cage
TPA    Injection moulded PEEK cage, outer ring centred
V    Full complement rolling elements bearing (without cage)
W    Modified ring width tolerance, +0.05/0 mm
X    Boundary dimensions changed to conform to ISO
Z    Pressed steel shield on one side of the bearing
ZN    Pressed steel shield on the contrary side of snap ring groove of the bearing
ZZ    Pressed steel shields on both sides of the bearing
2RS    Rubber (NBR) seal on both sides of the bearing (contact type
2RSR    Rubber (NBR) seal on both sides of the bearing (without seal groove in inner ring, contact type)
2RZ    Low friction, rubber (NBR) seal on both sides of the bearing
/S0    Bearing rings dimensionally stabilized for use at operating temperature to +150°C
/S1    Bearing rings dimensionally stabilized for use at operating temperature to +200°C
/S2    Bearing rings dimensionally stabilized for use at operating temperature to +250°C
/S3    Bearing rings dimensionally stabilized for use at operating temperature to +300°C
/S4    Bearing rings dimensionally stabilized for use at operating temperature to +350°C
/D    Two pieces of bearings
/T    Three pieces of bearings
/Q    Four pieces of bearings
/BO    Black oxidation
/NP    Nickel plating
/ZP    Zinc plating



 
 
 
   Characteristics of TCB bearings
     Bearing Materials
     Load rating and life
     Internal clearance
     Tolerance
     Chamfer dimension
     Lubrication
     Types of sealing
     Bearing designation
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