Datasheet
Mounting of Auto Switch/Direct Mounting Style
To mount auto switches, follow the instruction illustrated below.
ø20 to ø100
Use a watchmakers screwdriver with a handle 5 to 6 mm in diameter 
when tightening the auto switch mounting screw.
Protrusion
Hexagon socket head cap screw
(M2.5 x 9 L)
Hexagon socket head cap screw
(M2.5 x 6 L)
Auto switch 
mounting bracket
 Note)
ø20 to ø100
q Insert the protrusion on the bottom of the auto switch into the mating 
part of the auto switch mounting bracket and fix the auto switch and 
the auto switch mounting bracket temporarily by tightening the 
hexagon socket head cap screw (M2.5 x 9 L) 1 to 2 turns.
w Insert the temporarily tightened mounting bracket into the mating 
groove of the cylinder/actuator, and slide the auto switch onto the 
cylinder/actuator through the groove.
e Check the detecting position of the auto switch and fix the auto 
switch firmly with the hexagon socket head cap screw (M2.5 x 6 L, 
M2.5 x 9 L).
∗
r If the detecting position is changed, go back to step w. 
∗ The hexagon socket head cap screw (M2.5 x 6 L) is used to fix the 
mounting bracket and cylinder/actuator.
This enables the replacement of the auto switch without adjusting 
the auto switch position. 
Note 1) Ensure that the auto switch is covered with the mating groove 
to protect the auto switch. 
Note 2) The torque for tightening the hexagon socket head cap screw 
(M2.5 x 6 L, M2.5 x 9 L) is 0.2 to 0.3 N·m. 
Note 3) Tighten the hexagon socket head cap screws evenly. 
Note 4) For ø80 or ø100, in the case of mounting the auto switch of 
the D-P3DW Series onto the port surface, if the corner of 
the fitting hexagon interferes with the auto switch, adjust the 
tightening of the fitting to eliminate the interference.
In the case of interference with an elbow type fitting, direct 
the port of the fitting away from the auto switch.
Such interference must be avoided especially when selecting 
a speed controller with fittings or speed exhaust controller, 
etc.
Note 5) When the cylinder with auto switches is ordered, the body of 
the cylinder/auto switch and auto switch mounting bracket 
are shipped together.
Tightening Torque of Auto Switch
Mounting Screws
Auto switch model Tightening torque
D-M9(V)
D-M9W(V)
D-M9A(V)L
D-A9(V)
0.05 to 0.15
0.10 to 0.20
Applicable auto switch Auto switch mounting bracket part no.
D-P3DW
BQ3-032S
(N
.
m)
<Applicable auto switch>
Solid state······D-M9(V)
D-M9W(V)
D-M9A(V)
Reed···············D-A(V)
<Applicable auto switch>
Solid state······D-P3DW
Watchmakers screw driver
Auto switch mounting screw
Auto switch
Note) When the auto switch 
mounting bracket is 
ordered by its part 
number, it includes all 
the bracket and bolts 
in the above chart.
ISO Standards [ISO/21287] Compact Cylinder 
Series C55
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