Hollow cylinders

version with internal thread
single and double acting
max. operating pressure 500 bar

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Catalogue sheet

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Operating instructions

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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)

Number

Item no.	CAD data	stroke [mm]	functioning	piston diameter [mm]	max. force to push [kN]
Item no. 1752004	CAD data	stroke [mm] 6	functioning single acting with spring return	piston diameter [mm] 20	max. force to push [kN] -	Properties
Item no. 1752023	CAD data	stroke [mm] 10	functioning double acting	piston diameter [mm] 20	max. force to push [kN] 10	Properties
Item no. 1754004	CAD data	stroke [mm] 8	functioning single acting with spring return	piston diameter [mm] 32	max. force to push [kN] -	Properties
Item no. 1754023	CAD data	stroke [mm] 12	functioning double acting	piston diameter [mm] 32	max. force to push [kN] 24	Properties
Item no. 1755004	CAD data	stroke [mm] 10	functioning single acting with spring return	piston diameter [mm] 40	max. force to push [kN] -	Properties
Item no. 1755023	CAD data	stroke [mm] 16	functioning double acting	piston diameter [mm] 40	max. force to push [kN] 38	Properties
Item no. 1756004	CAD data	stroke [mm] 12	functioning single acting with spring return	piston diameter [mm] 50	max. force to push [kN] -	Properties
Item no. 1756023	CAD data	stroke [mm] 20	functioning double acting	piston diameter [mm] 50	max. force to push [kN] 57.9	Properties
Item no. 1757004	CAD data	stroke [mm] 16	functioning single acting with spring return	piston diameter [mm] 63	max. force to push [kN] -	Properties
Item no. 1757023	CAD data	stroke [mm] 32	functioning double acting	piston diameter [mm] 63	max. force to push [kN] 93	Properties

Accessories (48)

Number

Item no.	CAD data	Description
Item no. 3614039	CAD data	Description Contact bolt M6 x 6 mm dome head as per data sheet G3.800
Item no. 3614065	CAD data	Description Contact bolt M27 x 32 mm with coupling pin max. 350 bar, as per data sheet G3.800
Item no. 3614066	CAD data	Description Contact bolt M30 x 25 mm with coupling pin max. 350 bar, as per data sheet G3.800
Item no. 3614068	CAD data	Description Contact bolt M6 x 6 mm cone head as per data sheet G3.800
Item no. 3614069	CAD data	Description Contact bolt M8 x 8 mm cone head as per data sheet G3.800
Item no. 3614070	CAD data	Description Contact bolt M10 x 12 mm with coupling pin max. 350 bar, as per data sheet G3.800
Item no. 3614072	CAD data	Description Swivel contact bolt M8 x 8 mm ball - flat face Ø 7.2 mm admissible load 10 kN as per data sheet G3.800
Item no. 3614073	CAD data	Description Swivel contact bolt M10 x 10 mm ball - flat face Ø 10.5 mm admissible load 25 kN as per data sheet G3.800
Item no. 3614074	CAD data	Description Swivel contact bolt M12 x 12 mm ball - flat face Ø 10.5 mm admissible load 25 kN as per data sheet G3.800
Item no. 3614075	CAD data	Description Swivel contact bolt M16 x 16 mm ball - flat face Ø 20 mm admissible load 90 kN as per data sheet G3.800

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.