Fig.1

OZAK is the best quality and guaranteed under reliability test.
99.901Rank
ランク9580

2Markerマーク

3RD

DescriptionStandard
スタンダードseries

RCGreasedseries
グリース潤滑RBMFseries
メインテナンスフリーRAUseries ウルトラ）
超寿命（U456In L

10F‑120RAx18.5

In In 1/(1‑ F)

50‑2105‑3RB
x3.7

RERC

2‑4x1.9

1RD

110RD

RC

=x1.0

=x1.9100

L

RB

RA

=x3.7

=x18.5x1.0

1000

Lifetime
Comparison
寿命比較

x50Km

Criterion of Selection for reliability design (RA to RD)
RD ： Standard series ： Standard reliability
RC ： Greased series ： Stable reliability under grease lubrication
G, CG, VG, HG, FG 5 types of grease
RB ： MF(Maintenance Free) series ： High reliability with clean operation
RA ： U(Ultra-Long life) series ： Higher reliability under heavy moment load application
Every linear bearings can be U series.
Put "U" letter on the head. It means the bearing is U series.
呼ビ番号U LF20 −UU −G −4-M5×20

ウルトラ型 番標準型
M‑防錆型
シール
UU
両シール付

26

グリース
無記号 グリースなし
G
標準グリース
クリーングリースCG
真空グリース
VG
高温グリース
HG
食品グリースFG※グリースの性状P40参照

ボルト本数-ボルトサイズ

六角穴付ボルト（三価クロメート）
セット納入推奨六角穴付ボルト
軸径六角穴付ボルト（d）
呼び径 長 さ6, 8
M310, 12, 16
10～16
M412, 16, 20
20, 25
M516, 20, 25
30, 35
M620, 25, 30
40, 50M825, 30, 35
60
M10 35, 40, 45※上記以外の長サをご希望の場
合は，別途お問い合わせ下さい．

Selection for reliability design
1. RankA : U series (Ultra-Long Life)
To use of linear bearings, there are many instances where acts moment load such as shown inFig.2. Even in such harsh conditions, U series durability of 18 times more than RankD (Standardproduct) by the processing technology and many years of experience of OZAK is guaranteed by theexperimental data shown in Fig.1. In addition, you can greatly reduce maintenance cost.
In OZAK linear bearings, every models can be "U" ultra series. Please put "U" letter on the head ofstandard model number listed in the catalogue when you order.

We have explained in detail to the next page (28 to 29) with regard to the load distribution(edge load) and life calculation method under moment load acting. Please consult us whenmoment load is quite heavy. We will submit a technical calculation report.

2. RankB : MF series (Maintenance Free)
In order to fulfill much demands for clean circumstances and reduction of maintenance cost in recent years, thespecial seal was developed. As special seal structure shown in Fig.3 prevents almost grease leakage and forms
enough oil film onto rolling contact area, MF series durability of 3.7 times more than RankD is guaranteed by
the experimental data shown in Fig.1. Therefore you can greatly reduce maintenance cost.
In addition, rustproof type is also standardized and is suited to environments required corrosion resistance.

3. RankC : G series (Grease Lubrication)
In reciprocating mechanism for example linear bearings, linear guides, ball screws ball splines and so on, rolling
elements must stop and go back to opposite direction. This means rolling elements speed(rotation and revolution)
becomes zero in certain instant. Therefore oil film is eliminated and the life is affected adversely by occurring aslip of rolling elements. It's quite difficult to prevent occurrence of this phenomenon on the mechanism of thereciprocating motion bearing. The method of lubrication is the best solution from cost and performance points ofviews. Conventionally, we have requested customers to replenish appropriate grease of appropriate amount. OZAK
revised the concept and arranged greased series that are suited to customers environment. G series durability of 2times more than RankD is guaranteed by the experimental data shown in Fig.1.
OZAK prepares 5 types of grease as shown in Fig.4 (For general industry, clean room, vacuum, high temperatureand food industry).
Fig.2

Fig.3

全周MFig.427