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IKO bearings nominal type detailed description

IKO is the first comprehensive manufacturer in Japan to start the technical development of needle roller bearings and is famous for its high quality and wide range of products.

Needle roller bearings are bearings for rotary motion that use needle-like fine rollers instead of traditional rolling elements such as balls. They are small, lightweight, and have a large load capacity. Needle roller bearings are widely used in automobiles, industrial machinery, and automated office equipment as resource-saving bearings that reduce the size of machinery and facilitate miniaturisation.

1 IKO bearing nominal type arrangement description

The nominal type of IKO bearings consists of basic type and auxiliary marks, and its arrangement and representative marks are as follows:
1. Form mark: It is the mark that indicates the type of bearing.

2. Main dimensions: nominal type within the main dimensions of the marking due to the form of the bearing varies, basically with one of the following four kinds of marking.

a. Size series + inner diameter type

b. Inner diameter or outer diameter + outer diameter or outer diameter + width

c. Inner diameter or outer diameter + width

d. Basic diameter

Mark	Type of Raw Material
F	Track wheels and rolling bodies are stainless steel
N	Synthetic Resin Cage
V	No cage
Z	Comes with dust cover
ZZ	With double shielding
U	Single sealing gasket included
UU	Double gasket included
2RS	With double sealing gasket
NR	With outer ring O.D. stop
OH (1)	Oil holes in track wheels
J	NO oil hole
C2	Gap C2
NO MARK	Gap CN
C3	gap C3
C4	gap C4
C5	gap C5
T1	Special radial clearance (for crossed roller bearings)
C1
C2
No mark	JIS 0 level
P6	JIS 6 level
P5	JIS 5 level
P4	JIS 4 level