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Needle Roller Bearings - Ntn-snr.com

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Bearing Type Symbols and Auxiliary Symbols<br />

NTN<br />

Table 1.2.2 Auxiliary symbols<br />

Symbol<br />

Symbol representation<br />

Initial symbols<br />

Material<br />

heat-treatment<br />

symbols<br />

TS-<br />

M-<br />

E-<br />

F-<br />

H-<br />

C-<br />

Bearing for high temperature application which was<br />

heat-treated for dimensional stabilization<br />

Plated bearing<br />

Bearing made of case-hardened steel<br />

Bearing made of stainless steel<br />

Bearing made of high speed steel<br />

Bearing made of carbon steel<br />

Expansion <strong>com</strong>pensation<br />

EC-<br />

Expansion-<strong>com</strong>pensated bearing<br />

Basic symbols<br />

Internal construction<br />

symbols<br />

ZW<br />

A,B,C<br />

Double-row cage<br />

Internal construction change<br />

Cage symbols<br />

J<br />

F1<br />

L1<br />

T2<br />

L3<br />

L5<br />

S<br />

Steel plate punched cage<br />

Machined iron cage<br />

High-strengh yellow copper cage<br />

Polyamide resin cage<br />

Aluminum alloy cage<br />

Sintered alloy cage<br />

Welded cage<br />

Seal symbols<br />

L,LL<br />

P,PP<br />

With synthetic rubber seal<br />

With plastic seal<br />

Tail codes<br />

Bearing ring profile<br />

symbols<br />

K<br />

N<br />

NR<br />

W<br />

D<br />

D1<br />

H<br />

Bearing with 1/12 tapered bore<br />

Grooved snap ring<br />

With snap ring<br />

Bearing ring with notched knock hole<br />

With oil hole<br />

With oil hole and oil groove<br />

Cam follower with hexagon hole<br />

Combination symbols<br />

D2,Dn<br />

+<br />

-P<br />

Complex bearing using two or more same bearings<br />

With spacer<br />

Without cross roller stud<br />

Clearance symbols<br />

C2<br />

C3<br />

C4<br />

NA<br />

Clearance smaller than ordinary clearance<br />

Clearance larger than ordinary clearance<br />

Radial clearance larger than C3<br />

Non-interchangeable clearance<br />

Accuracy class<br />

symbols<br />

P6<br />

P5<br />

P4<br />

Bearing of JIS Class-6<br />

Bearing of JIS Class-5<br />

Bearing of JIS Class-4<br />

Lubrication symbols<br />

/2A<br />

/3A<br />

SHELL ALVANIA Grease 2<br />

SHELL ALVANIA Grease 3<br />

Special symbols<br />

V1Vn<br />

Special specification, requirements<br />

A-58

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