Identification and Suffix Symbols
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Identification and Suffix Symbols of IKO
Identification and Suffix Symbols of IKO

Symbol

Product

Description

Special Remark

C

Material 

cemented steel for outer ring 

 

F

 

stainless steel for bearing and rolling elements 

 

 

 

 

 

N

Cage 

made of synthetic resin 

 

V

 

no cage or full complement 

 

 

 

 

 

Z

Seal or shield 

with dust cover on one side

 

ZZ

 

with dust cover on both sides 

 

U

 

with seal on one side  

 

UU

 

with seal on both sides 

 

2RS

 

with seals on both sides  

 

 

 

 

 

NR

bearing ring shape

with stop ring on outer surface of outer ring  

 

OH

 

with oil hole in bearing ring 

this differs according to type of bearing 

J

 

No oil hole 

 

 

 

 

 

C2

clearance symbol

lower clearance than normal 

interchangeable needle-roller bearing   

(none)

 

normal clearance  

s.o.

C3

 

higher clearance than normal

s.o.

C4

 

higher clearance than C3 

s.o.

C5

 

higher clearance than C4

s.o.

C2

 

lower clearance than normal 

non-interchangeable needle-roller bearing 

C0

 

normal clearance  (is not indicated)

s.o.

C3

 

higher clearance than normal

s.o.

C4

 

higher clearance than C3

s.o.

C5

 

higher clearance than C4

s.o.

T1

 

special radial clearance 

Crossed roller bearing 

C1

 

special radial clearance 

 

C2

 

special radial clearance 

 

 

 

 

 

(none)

 Classification

JIS Class 0

 

P6

 

JIS Class 6

 

P5

 

JIS Class 5

 

P4

 

JIS Class 4

 

P

 

IKO accuracy class: Precision class 

 
Identification and Suffix Symbols of INA
 Identification and Suffix Symbols of INA

Symbol

Product

Description

Remarks

A, B, C

 

The meaning of the symbol is not defined in detail.

These are used as required for the designation of special features of the internal design or outer shape.

Their use is generally limited in time, in order to avoid confusionduring a transitional period.

In some cases, they are also used for the permanent designation of bearings and parts of the same type and external dimensions, but with different internal design.  

 

Current abbreviations for -A

 

NUKR, PWKR, PWKRE-2RS with -A means: with internal hexagonal drive and optimised profile. The hexagonal drive was previously designated -SK, but without an optimised profile!     

 

 

 

 

 

AS1

 Version

Lubrication hole in outer ring

 

IS1

 

Lubrication hole in inner ring

 

TN

 

Plastic cage

 

C3

 

Radial clearance higher than normal

 

P5

 

Tolerance class: bearing with specially high dimensional and running accuracy

 

EGS

 

Inner ring with torsion-free race (for grinding seals)

 

VGS

 

Inner ring race with processing additive; The race is pre-ground. Values for diameter FVGS

 

 

 

 

 

G2

Sorting 

Standard quality class of the needle rollers

 

SORT..

 

Types of the needle rollers for needle housings, dimensions in m

 

PE

 

 extended tolerances (ZKFL/ZKLN only)

 

RR

 

with Corrotect® coating

 

SK

 

Inner hexagonal drive for taper rollers, intended to become standard and replace the slotted version!  

 

 

 

 

 

SM03

Lubrication

Lubricated with KP2N-25 grease to DIN 51825, for temperature range -30°C to +150°C 

 

SM11

 

Lubricated with K2E-25 grease toDIN 51825, for temperature range -40°C to +150°C

 

ZW

 

Radial needle housing, two-row

 

.2AP

 

Axially paired bearing (ZKFL/ZKLN only ) 

 

 

 

 

 

RS

Seal

Lip seal on one side of bearing

 

.2RS

 

Lip seal on both sides of bearing

 

PP

 

Lip seal on both sides of bearing

 

.2Z

 

Split seal on both sides of bearing

 

FPM

 

Sealing rings of fluorinated rubber

 

 

 

 

 

X

Suffix

Bearings and accessories whose outer dimensions have been changed due to modifications to international standards
The X symbol is used only during a transitional period.

X also stands for cylindrical outer ring races for taper and support rollers

 
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