Workholding
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Series
B1.7441

Hollow cylinders

version with internal thread
single and double acting
max. operating pressure 500 bar
Hollow cylinders
Downloads
Catalogue sheet
Operating instructions
Information Series
Description
B 1.7441 Hollow-piston cylinders 

Hollow-piston cylinders are especially suitable for clamping workpieces that have a through hole or opening.

The piston has a through hole with an internal thread.
In connection with a standard tie rod and C-washer combination a variety of applications is possible (see application examples).
After the workpiece has been inserted and centred by hand, the C-washer can be pushed onto the tie rod and then clamped hydraulically.
Compared to mechanical clamping with clamping screws this has significant advantages:

  • The clamping force can be hydraulically adjusted with precision and high repetitive accuracy
  • The operator can fully concentrate on the correct position of the workpiece
  • A significant time saving
Products (12)
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stroke [mm]
functioning
piston diameter [mm]
max. force to push [kN]
max. pulling force [kN]
max. operating pressure [bar]
500 (12)
seals
NBR (12)
hydraulic ports
pipe thread (12)
external thread [mm]
Ø through hole [mm]
Item no. CAD datastroke [mm]functioningpiston diameter [mm]max. force to push [kN]
Item no.
CAD data
stroke [mm]
6
functioning
single acting with spring return
piston diameter [mm]
20
max. force to push [kN]
-
Properties
Item no.
CAD data
stroke [mm]
10
functioning
double acting
piston diameter [mm]
20
max. force to push [kN]
10
Properties
Item no.
CAD data
stroke [mm]
8
functioning
single acting with spring return
piston diameter [mm]
32
max. force to push [kN]
-
Properties
Item no.
CAD data
stroke [mm]
12
functioning
double acting
piston diameter [mm]
32
max. force to push [kN]
24
Properties
Item no.
CAD data
stroke [mm]
10
functioning
single acting with spring return
piston diameter [mm]
40
max. force to push [kN]
-
Properties
Item no.
CAD data
stroke [mm]
16
functioning
double acting
piston diameter [mm]
40
max. force to push [kN]
38
Properties
Item no.
CAD data
stroke [mm]
12
functioning
single acting with spring return
piston diameter [mm]
50
max. force to push [kN]
-
Properties
Item no.
CAD data
stroke [mm]
20
functioning
double acting
piston diameter [mm]
50
max. force to push [kN]
57.9
Properties
Item no.
CAD data
stroke [mm]
16
functioning
single acting with spring return
piston diameter [mm]
63
max. force to push [kN]
-
Properties
Item no.
CAD data
stroke [mm]
32
functioning
double acting
piston diameter [mm]
63
max. force to push [kN]
93
Properties
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Item no.
stroke [mm]
6
functioning
single acting with spring return
piston diameter [mm]
20
max. force to push [kN]
-
max. pulling force [kN]
10
max. operating pressure [bar]
500
seals
NBR
hydraulic ports
pipe thread
external thread [mm]
M40x1,5
Ø through hole [mm]
6.5
Item no.
stroke [mm]
10
functioning
double acting
piston diameter [mm]
20
max. force to push [kN]
10
max. pulling force [kN]
10
max. operating pressure [bar]
500
seals
NBR
hydraulic ports
pipe thread
external thread [mm]
M40x1,5
Ø through hole [mm]
6.5
Item no.
stroke [mm]
8
functioning
single acting with spring return
piston diameter [mm]
32
max. force to push [kN]
-
max. pulling force [kN]
30
max. operating pressure [bar]
500
seals
NBR
hydraulic ports
pipe thread
external thread [mm]
M48x1,5
Ø through hole [mm]
10.5
Item no.
stroke [mm]
12
functioning
double acting
piston diameter [mm]
32
max. force to push [kN]
24
max. pulling force [kN]
30
max. operating pressure [bar]
500
seals
NBR
hydraulic ports
pipe thread
external thread [mm]
M48x1,5
Ø through hole [mm]
10.5
Item no.
stroke [mm]
10
functioning
single acting with spring return
piston diameter [mm]
40
max. force to push [kN]
-
max. pulling force [kN]
47
max. operating pressure [bar]
500
seals
NBR
hydraulic ports
pipe thread
external thread [mm]
M60x1,5
Ø through hole [mm]
12.5
Item no.
stroke [mm]
16
functioning
double acting
piston diameter [mm]
40
max. force to push [kN]
38
max. pulling force [kN]
47
max. operating pressure [bar]
500
seals
NBR
hydraulic ports
pipe thread
external thread [mm]
M60x1,5
Ø through hole [mm]
12.5
Item no.
stroke [mm]
12
functioning
single acting with spring return
piston diameter [mm]
50
max. force to push [kN]
-
max. pulling force [kN]
73.6
max. operating pressure [bar]
500
seals
NBR
hydraulic ports
pipe thread
external thread [mm]
M75x1,5
Ø through hole [mm]
16.5
Item no.
stroke [mm]
20
functioning
double acting
piston diameter [mm]
50
max. force to push [kN]
57.9
max. pulling force [kN]
73.6
max. operating pressure [bar]
500
seals
NBR
hydraulic ports
pipe thread
external thread [mm]
M75x1,5
Ø through hole [mm]
16.5
Item no.
stroke [mm]
16
functioning
single acting with spring return
piston diameter [mm]
63
max. force to push [kN]
-
max. pulling force [kN]
115.6
max. operating pressure [bar]
500
seals
NBR
hydraulic ports
pipe thread
external thread [mm]
M90x2
Ø through hole [mm]
21
Item no.
stroke [mm]
32
functioning
double acting
piston diameter [mm]
63
max. force to push [kN]
93
max. pulling force [kN]
115.6
max. operating pressure [bar]
500
seals
NBR
hydraulic ports
pipe thread
external thread [mm]
M90x2
Ø through hole [mm]
21
Accessories (12)
Item no. CAD data Description
Item no.
CAD data
/
Description
Item no.
CAD data
Description
Lock nut DIN 1804 M120 x 2 mm as per data sheet B1.7441
Item no.
CAD data
/
Description
Item no.
CAD data
Description
Flange nut DIN 1804 M48 x 1,5 mm see page B1.309
Item no.
CAD data
Description
Flange nut M60 x 1,5 mm W black oxided see page B1.460
Item no.
CAD data
Description
Flange nut DIN 1804 M90 x 2 mm see page B1.309
Item no.
CAD data
Description
Flange nut DIN 1804 M75 x 1,5 mm see page B1.309
Item no.
CAD data
Description
Flange nut DIN 1804 M40 x 1,5 mm see page B1.309
Item no.
CAD data
Description
Socket head cap screw M8 x 20 mm, 8.8, galvanized as per data sheet B1.7441
Item no.
CAD data
Description
Flange for hollow-piston cylinder 1756-XXX Ø 105 x 20 mm as per data sheet B1.7441
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Application examples
Application example 1

Hollow-piston cylinders in combination with push-pull bolt and “C”-washer can be used advantageously in many cases to clamp workpieces with centre openings.

Application example 2

 On the shown machine table, the workpiece is clamped with a hollow-piston cylinder and additionally supported with a work support, controlled by a sequence valve.
The support plunger of the work support is retracted in off-position to facilitate workpiece loading. Contact is effected by means of spring force. The savings in workpiece exchange time, compared to a mechanical clamping system amounts to 58%.

Application example 3

This clamping fixture is for milling operation on a light extruded rail. Workholding by means of hollow-piston cylinders in individual clamping stations mounted on a base plate. Positioning and support of the rail is effected with two longitudinal members matching the cross section of the rail.