Specifications

1. Use appropriate pliers (C-type snap ring installing
tool) for installation and removal of snap rings.
2. Even when using appropriate pliers (C-type snap ring
installing tool), proceed with caution as there is a
danger of the snap ring flying off the end of the pliers
(tool) and causing bodily injury or damage to nearby
equipment. After installation, make sure that the snap
ring is securely seated into the snap ring groove
before supplying air.
Installation and Removal of Snap Rings
Caution
1. Operate the cylinder to the stroke end.
When the stroke is restricted by an external stopper or a
clamped work piece, sufficient cushioning and noise reduction
may not be achieved.
2. Strictly observe the limiting ranges for load weight
and maximum speed (Graph 1). Also, the limiting
ranges provided here are based on the condition
that the cylinder is operated to the stroke end with a
proper cushion needle adjustment.
If operated beyond the limiting ranges, excessive impact will
occur and this may cause damage to equipment.
3. Adjust the cushion needle to reduce excessive
kinetic energy from the piston impact at the stroke
end by allowing it to absorb sufficient kinetic
energy during the cushion stroke.
If due to improper adjustment, the piston impacts the stroke
end with excessive kinetic energy (values above those given in
Table 1), an excessive impact will occur and this may cause
damage to equipment.
4. Strictly observe the limiting ranges for the piston rod
lateral load (Graph 2).
If operated beyond the limiting ranges, equipment life may be
reduced or damage to equipment may occur.
Selection
Caution
Caution
Selection
1. Keep the adjustment range for the cushion needle
between the fully closed position and the rotations
shown below.
Use a 3mm flat head watchmakers screwdriver to adjust the
cushion needle. The adjustment range for the cushion needle
must be between the fully closed position and the open position
ranges indicated in the above table. A retaining mechanism
prevents the cushion needle from slipping out; however, it may
spring out during operation if it is rotated beyond the ranges
shown above.
Cushion Needle Adjustment
Caution
Table 1. Allowable kinetic energy at piston impact
Unit: J
Series CU
Specific Product Precautions
Be sure to read before handling.
Refer to pages 12 through 18 for Safety Instructions, Actuator Precautions, and Auto Switch Precautions.
Piston speed
Allowable kinetic energy
20
0.055
25
50 to 500mm/s
0.09
32
0.15
Tightening torque
20, 25
32
Bore sizes
(mm)
Hexagon socket head cap screw
(mm)
Proper tightening torque
(N⋅m)
M5
M6
5.10 ±10%
8.04 ±10%
10 100 1000
25.00
20.00
15.00
10.00
5.00
0.00
Graph 1
Maximum speed (mm/s)
Load weight (kg)
: Operating pressure 0.5MPa
: Operating pressure 0.4MPa
Rotations
2.5 rotations or less
ø20 to ø32
ø32
ø25
ø20
1. Refer to the below table for mounting cylinders.
Mounting
Caution
Piston rod lateral load (Graph 2)
0.00
0.50
1.00
1.50
2.00
2.50
3.00
3.50
4.00
4.50
5.00
20 30 40 50 60 70 80 90 100
Stroke (mm)
Lateral load (N)
ø32
ø25
ø20
19