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When you install the linear block and the rail on the table or bed, you first need to consider the height of the mounting plane. In addition, the mounting plane’s edge should not interfere with the mounting of the linear block and the rail. You should therefore pay attention to radius R when you process it.

Name number Radius R Linear block
Height H1
Linear block
Height H2
E
SJ 5 0.2 3 1.2 1.5
SJ(L) 7 0.2 3 1.2 1.5
SJ(L) 9 0.3 3 1.9 2.2
SJ(L) 12 0.3 4 2.0 3.0
SJ(L) 15 0.3 5 2.5 4.0
SJW 5 0.2 3 1.7 3.5
SJW(L) 7 0.1 3 3.4 3.7
SJW(L) 12 0.3 4 3.7 4.0
SJW(L) 15 0.3 5 3.4 3.7

Mounting Plane Design

Accuracy specs
As shown in the table, accuracy is defined as the necessary height/width when you mount multiple rails on the same plane or when you use multiple blocks in one rail (driving flatness, height, width tolerance)
Radial clearance
The miniature linear guidebook shows two types of radial clearance such as K1, K2.

• Radial clearance specs( Unit : ㎛ )

Pre pressure symbol Normal Low pre pressure
Name number K1 K2
5 -2 ~ +2 -4 ~ 0
7 -2 ~ +2 -4 ~ 0
9 -2 ~ +2 -4 ~ 0
12 -2 ~ +2 -6 ~ 0
15 -2 ~ +2 -10 ~ 0

* The same radial clearance is applied to SBM, SBML and
  SBMW types.

• Seal resistance( Unit : N )

Name number SJ SJL SJW SJWL
5 0.1 - - -
7 0.2 0.2 0.6 0.6
9 0.2 0.2 0.8 0.8
12 0.59 0.59 1.1 1.1
15 1.18 1.18 1.3 1.3

* The seal resistance for a single miniature block is shown
  in the below table.

Safety design
The miniature linear rail and block are made of stainless steel with high resistivity against corrosions. It is able to corrode in lots of moisture or chemicals, so special coating or raydent coating can extent the period of maintenance.