Hydraulic specimen grips – double actuator

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Material

Metals
Wood

Test load

50 kN - 250 kN

Specimen shape

Flat specimens
Round specimens
Short clamping lengths

Type of test

Tensile
Compression
Alternating load

Symmetrical and asymmetrical gripping

Double-actuator hydraulic grips always close symmetrically with respect to the tensile axis. This means the specimen is gripped in a precise axial position, thereby eliminating the need for thickness adjustment.

Testing of sintered metal specimens

The patented hydraulic grip is also ideally suited for short clamping lengths.

Advantages & features

Advantages

The constant gripping force allows for repeatable test results.

Reliable test results are guaranteed with the optimal interaction between the hydraulic power pack, the electronics, and the testing software. The force-zero control prevents unwanted forces on the specimen during the gripping process.

Time is saved due to quick and easy adaptation of small specimen grips and test fixtures to large specimen grips via the T-slotted system. Precise alignment ensures reliable test results.

The symmetrically closing jaws save time required for adjusting to varying specimen thicknesses and ensure that the specimen is held exactly in the test axis.

Short specimens can also be gripped due to the special design of the specimen grip.

Fast and easy insertion of specimen due to the ergonomic and open design.

An adjustable centering stop ensures precise test results, even with high specimen throughput rates.

Operating principle

The oil pressure is set at the hydraulic power pack according to the required closing pressure for the specimen grips. The control unit controls the closing and opening procedure separately for the top and bottom specimen grips.

Furthermore, the closing procedure is divided into a closing phase and gripping phase when a a universal hydraulic power pack is used. In the closing phase, the specimen is initially held on the upper end for safety reasons. During gripping, the full gripping force is applied. The force value is based on the expected tensile force.

Function description, short clamping lengths

It is not necessary to set the thickness. This is a big advantage, above all, for soft specimens or if specimen thickness changes.

Double-sided actuators

All hydraulic grips are equipped with double-sided actuators. This means the specimen grip opens hydraulically and not by means of spring return mechanism. The closing and opening pressure can be adjusted.

In contrast to single-acting actuators that open by means of a spring return mechanism, double-sided actuators ensure that the specimen grips always open safely . This also applies if the specimen is crooked or jammed. Additionally, the full opening stroke is not necessary because the opening procedure can be interrupted at any point using the Stop button. The opening stroke can be adjusted according to thickness. Especially with thin specimens, the test time is reduced and the risk of pinching parts of the body is minimized.

Single-sided and double-sided closing specimen grips

Single-actuator hydraulic grips can be used for the symmetrical and asymmetrical gripping of specimens (for example, for shear tests). The thickness of the specimen is set by means of screw unit.

The single-actuator hydraulic grips are also available with a tandem cylinder to enable uniform force application to the specimen (especially suitable for tests on fabrics, textiles and geotextiles).

T-slotted system

The T-slotted system makes it possible to accommodate small load cells, specimen grips, test tools, and fixtures quickly, without having to dismantle the specimen grips.

T-slots are integrated in the gripping area of the specimen grip. These serve as mounts for the T-slotted mounting. The T-slotted mounting is clamped there. Other fixtures can now be mounted, saving time needed to mount other tools and fixtures.

Picture gallery

Hydraulik specimen grip_type 8594_AllroundLine_SNS_metals

Hydraulic grip type 8594 on an AllroundLine SNS for testing of metals

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Hydraulic grip for short clamping lengths

Double-actuator hydraulic grip for short clamping lengths

Properties according to force range

Item No.	313646¹
Type	8494
Test load F_max	50	kN
Operating principle/identification	Double-sided closing
Gripping force, max. at 300 bar	100	kN
Operating pressure	12 ... 300	bar
Dimensions
Height	205	mm
Width	386	mm
Depth	132	mm
Gripping travel	35	mm
Opening width with jaws	See table of jaws (specimen thickness)
Gripping of the specimen	The specimen must be gripped with at least 2/3 of the jaw height.
Weight per specimen grip, approx.	37	kg
Connection	Ø 36/60²	mm
Ambient temperature	+10 ... +35	°C
Scope of delivery	2	pieces

Recommended and approved for strain rate control to standards DIN EN ISO6892-1:2009 and ASTM E8-09.
These specimen grips can be offered with a 36 mm or 60 mm connection (selection made using parts list alternatives).

Item No.	032562¹
Type	8495
Operating principle/identification	Double actuator
Operating principle	Short clamping
Test load F_max	50	kN
Gripping force, max. at 300 bar	110	kN
Operating pressure, max.	300	bar
Dimensions
Height	316	mm
Width	413	mm
Depth	278	mm
Opening width with jaws	34	mm
Permissible surface pressure on jaw, max.	1000	N/mm²
Grip-to-grip separation, approx.	6	mm
Weight per specimen grip, approx.	69	kg
Connection	Ø 36	mm
Ambient temperature	+10 ... +35	°C
Scope of delivery	2	piece(s)

Recommended and approved for strain rate control compliant to standards DIN EN ISO 6892-1:2009 and ASTM E8–09.

Item No.	032563¹
Type	8495
Operating principle/identification	Double actuator
Operating principle	Short clamping
Test load F_max	70	kN
Gripping force, max. at 300 bar	110	kN
Operating pressure, max.	300	bar
Dimensions
Height	349	mm
Width	413	mm
Depth	278	mm
Opening width with jaws	34	mm
Permissible surface pressure on jaw, max.	1000	N/mm²
Grip-to-grip separation, approx.	6	mm
Weight per specimen grip, approx.	69	kg
Connection	Ø 60	mm
Ambient temperature	+10 ... +35	°C
Scope of delivery	2	piece(s)

Recommended and approved for strain rate control compliant to standards DIN EN ISO 6892-1:2009 and ASTM E8–09.

Item No.	313760¹
Type	8592
Operating principle/identification	Double-actuator
Test load F_max	100	kN
Gripping force, max. at 300 bar	250	kN
Gripping force, max. at 480 bar	-
Dimensions
Height	303	mm
Width	479	mm
Depth	170	mm
Width with screw unit, open completely	461	mm
Gripping travel	70	mm
Gripping of the specimen	The specimen must be gripped with at least 2/3 of the jaw height
Weight per specimen grip, approx.	70	kg
Connection	Ø 60	mm
Ambient temperature	+10 ... +35	°C
Scope of delivery	2	pieces

Recommended and approved for strain rate control to standards DIN EN ISO6892-1:2009 and ASTM E8-09.

Item No.	046496¹²
Type	8589
Operating principle/identification	Short clamping
Test load F_max	150	kN
Operating principle	Two-sided closing
Gripping force, max.	275	kN
Operating pressure, max.	300	bar
Grip-to-grip separation, min.	15	mm
Dimensions
Height	490	mm
Width	570	mm
Depth	445	mm
Opening width with jaws	59	mm
Weight per specimen grip, approx.	215	kg
Connection	Ø 60	mm
Ambient temperature	+10 ... +35	°C
Scope of delivery	2	pieces

Not possible in connection with Z100 THW, Z150 TL and Z250 RED
Recommended and approved for strain rate control to standards DIN EN ISO6892-1:2009 and ASTM E8-09.

Item No.	313782¹
Type	8594
Operating principle/identification	Double actuator
Test load F_max	250	kN
Gripping force, max. at 480 bar	410	kN
Gripping force, max. at 300 bar	-
Opening width with jaws	59	mm
Dimensions
Height	303	mm
Width	479	mm
Depth	170	mm
Width with screw unit, open completely	-	mm
Gripping travel	35	mm
Gripping of the specimen	The specimen must be gripped with at least 2/3 of the jaw height
Connection	Ø 60	mm
Ambient temperature	+10 ... +35	°C
Weight per specimen grip, approx.	70	kg
Scope of delivery	2	pieces

Recommended and approved for strain rate control to standards DIN EN ISO6892-1:2009 and ASTM E8-09.

Item No.	046873¹²
Type	8589
Operating principle/identification	Short clamping
Test load F_max	250	kN
Operating principle	Double actuator
Gripping force, max.	420	kN
Operating pressure, max.	400	bar
Grip-to-grip separation, min.	15	mm
Dimensions
Height	490	mm
Width	570	mm
Depth	445	mm
Opening width with jaws	59	mm
Weight per specimen grip, approx.	215	kg
Connection	Ø 60	mm
Ambient temperature	+10 ... +35	°C
Scope of delivery	2	piece(s)

Not possible in connection with Z100 THW, Z150 TL and Z250 RED
Recommended and approved for strain rate control compliant to standards DIN EN ISO 6892-1:2009 and ASTM E8–09.

Type	330	kN
Item No.	1014893
Maximum tensile force, F_max	330	kN
Maximum gripping force	588	kN
Flat specimens
Gripping area	0 ... 80	mm
Thickness, max.	80	mm
Width, max.	95	mm
Round specimens
Gripping area	5.5 ... 80	mm
System pressure, max.	480	bar
the required
Height (H)	280	mm
Width (W)	550	mm
Depth (D)	220	mm
Weight (each)	205	kg

Type	400	kN
Item No.	1014894
Maximum tensile force, F_max	400	kN
Maximum gripping force	588	kN
Flat specimens
Gripping area	0 ... 80	mm
Thickness, max.	80	mm
Width, max.	95	mm
Round specimens
Gripping area	5.5 ... 80	mm
System pressure, max.	480	bar
the required
Height (H)	280	mm
Width (W)	550	mm
Depth (D)	220	mm
Weight (each)	205	kg

Type	600	kN
Item No.	084473
Maximum tensile force, F_max	600	kN
Maximum gripping force	965	kN
Flat specimens
Gripping area	0 ... 100	mm
Thickness, max.	100	mm
Width, max.	128	mm
Round specimens
Gripping area	5.5 ... 100	mm
System pressure, max.	480	bar
the required
Height (H)	350	mm
Width (W)	630	mm
Depth (D)	250	mm
Weight (each)	320	kg

Type	1200	kN
Item No.	1015113
Maximum tensile force, F_max	1200	kN
Maximum gripping force	1600	kN
Flat specimens
Gripping area	0 ... 100	mm
Thickness, max.	100	mm
Width, max.	162	mm
Round specimens
Gripping area	5.5 ... 100	mm
System pressure, max.	480	bar
the required
Height (H)	459	mm
Width (W)	790	mm
Depth (D)	320	mm
Weight (each)	700	kg

Type	1600	kN
Item No.	628448
Maximum tensile force (F_max)	1600	kN
Maximum gripping force	2750	kN
Flat specimens
Clamping range	0 to 80	mm
Max. thickness	80	mm
Max. width	210	mm
Round specimens
Clamping range	5.5 to 80	mm
Max. system pressure	480	bar
Dimensions
Height (H)	603	mm
Width (W)	940	mm
Depth (D)	390	mm
Weight (each)	1305	kg

Type	2000	kN
Item No.	084466
Maximum tensile force (F_max)	2000	kN
Maximum gripping force	2750	kN
Flat specimens
Clamping range	0 ... 100	mm
Max. thickness	100	mm
Max. width	205	mm
Round specimens
Clamping range	5.5 ... 100	mm
Max. system pressure	480	bar
Dimensions
Height (H)	603	mm
Width (W)	940	mm
Depth (D)	390	mm
Weight (each)	1325	kg

Type	2500	kN
Item No.	611432
Maximum tensile force (F_max)	2500	kN
Maximum gripping force	3850	kN
Flat specimens
Clamping range	0 ... 100	mm
Max. thickness	100	mm
Max. width	210	mm
Round specimens
Clamping range	5.5 ... 100	mm
Max. system pressure	480	bar
Dimensions
Height (H)	650	mm
Width (W)	1090	mm
Depth (D)	430	mm
Weight (each)	1765	kg

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Downloads

Product information: Hydraulic grips, Fmax 50 kN PDF 146 KB
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Product information: Hydraulic grips, Fmax 100 kN / 250 kN PDF 691 KB
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Product information: Hydraulic grips for short clamping lengths, Fmax 50 kN / 70 kN PDF 369 KB
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Product information: Hydraulic grips for short clamping lengths, Fmax 150 kN / 250 kN PDF 330 KB
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Product information: Hydraulic grips up to 2500 kN PDF 280 KB
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Double Actuator