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Series
H4.306

Concentric clamping elements

2 and 3-point interior clamping
for interchangeable clamping jaws Ø 16 – 121 mm
double acting
max. operating pressure 250 bar
Concentric clamping elements
Downloads
Catalogue sheet
Operating instructions
Information Series
Description
H 4.306 Concentric clamping elements

Application
This hydraulically-operated concentric clamping element can be equipped with especially low clamping jaws to receive workpieces with interior centrings of low depth.
Suitable workpieces can directly rest on the clamping jaws so that additional support points are not required.
With a combination of 2 and 3-point elements, workpieces with 2 centring holes can be exactly positioned.

Description
The 2 or 3 base jaws are coupled to a coneshaped contact bolt in the centre of the housing, that is driven by a double acting hydraulic piston.
To obtain the required synchronization accuracy all parts are manufactured with high precision. The nitrated base jaws have 3 fixing threads. 
Depending on the desired centring diameter, the  accordingly adjusted clamping jaws can always by fixed with at least 2 screws.
Theexact position of the clamping jaws is secured with 2 drill bushings.

Positive air pressure connection
The standard positive air pressure protection keeps the hole centre free of swarf, so that the base jaws can freely return.

Pneumatic stroke end control
The positive air pressure protection can also be used for the control of the unclamping position. The returning clamping jaws close in their end position the bore hole of the positive air pressure connection.

Optional contact control
In the version with contact control, pneumatic pressure is supplied to one of the base jaws, which is then transmitted into the clamping jaw.
In the crowned clamping surface there is a small bore hole. If a workpiece is clamped correctly, it closes the bore hole.

Special features of the concentric clamping elements H4.306
Special features of the concentric clamping elements H4.306
Video
Products (4)
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type
round centring element (4)
functioning
double acting (4)
stroke end control
yes (4)
max. operating pressure [bar]
seals
NBR (4)
hydraulic ports
for drilled channels (4)
connection for positive air pressure protection
yes (4)
clamping stroke [mm]
max. clamping force [kN]
plunger Ø [mm]
- (4)
element
interior/exterior clamping
interior clamping (4)
contact control
clamping Ø [mm]
16-121 (4)
Item no. CAD datatypefunctioningstroke end controlmax. operating pressure [bar]
Item no.
CAD data
type
round centring element
functioning
double acting
stroke end control
yes
max. operating pressure [bar]
251
Properties
Item no.
CAD data
type
round centring element
functioning
double acting
stroke end control
yes
max. operating pressure [bar]
253
Properties
Item no.
CAD data
type
round centring element
functioning
double acting
stroke end control
yes
max. operating pressure [bar]
252
Properties
Item no.
CAD data
type
round centring element
functioning
double acting
stroke end control
yes
max. operating pressure [bar]
254
Properties
Loading…
Item no.
type
round centring element
functioning
double acting
stroke end control
yes
max. operating pressure [bar]
251
seals
NBR
hydraulic ports
for drilled channels
connection for positive air pressure protection
yes
clamping stroke [mm]
10
max. clamping force [kN]
2.5
plunger Ø [mm]
-
element
2-point element
interior/exterior clamping
interior clamping
contact control
no
clamping Ø [mm]
16-121
Item no.
type
round centring element
functioning
double acting
stroke end control
yes
max. operating pressure [bar]
253
seals
NBR
hydraulic ports
for drilled channels
connection for positive air pressure protection
yes
clamping stroke [mm]
12
max. clamping force [kN]
2.5
plunger Ø [mm]
-
element
2-point element
interior/exterior clamping
interior clamping
contact control
pneumatic
clamping Ø [mm]
16-121
Item no.
type
round centring element
functioning
double acting
stroke end control
yes
max. operating pressure [bar]
252
seals
NBR
hydraulic ports
for drilled channels
connection for positive air pressure protection
yes
clamping stroke [mm]
11
max. clamping force [kN]
1.67
plunger Ø [mm]
-
element
3-point element
interior/exterior clamping
interior clamping
contact control
no
clamping Ø [mm]
16-121
Item no.
type
round centring element
functioning
double acting
stroke end control
yes
max. operating pressure [bar]
254
seals
NBR
hydraulic ports
for drilled channels
connection for positive air pressure protection
yes
clamping stroke [mm]
13
max. clamping force [kN]
1.67
plunger Ø [mm]
-
element
3-point element
interior/exterior clamping
interior clamping
contact control
pneumatic
clamping Ø [mm]
16-121
Accessories (2)
Item no. CAD data Description
Item no.
CAD data
/
Description
O-ring 5 x 1.5 mm as per data sheet C2.320
Item no.
CAD data
/
Description
O-ring 17.17 x 1.78 mm as per data sheet H4.305
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