Hydraulic Grips

Hydraulic grips are primarily used when test loads of 50 kN and over, with associated high gripping forces, are required (Fmax from 10 kN to 2500 kN possible).

  • The clamping pressure can be adjusted and reproduced with a high degree of accuracy.
  • Defined force application ensures optimum gripping of sensitive materials.
  • Zwick's "Force Constant Hold" force stabilization system reliably protects the specimen from unwanted tensile or compression forces due to material flow or grip deformation during the closing and clamping process.
  • The ratio between gripping and tensile forces can be adjusted individually, ensuring that the specimen is held securely (at maximum tensile force approximately double gripping force is required).
Hydraulic grips

Key Advantages and Features

All of the components work together perfectly so you can rely on accurate, reproducible, repeatable and traceable testing results every time.  

Advantages and features

  • Hydraulic grips have an eccentric piston shape with a long piston stroke, achieving a deep clamping surface position and a large opening width.
  • The alignment of the jaws, specimen grips, and piston facilitates gripping of short specimens as well.
  • Defined force application ensures optimum gripping of sensitive materials.
  • Contact pressure can be reproduced exactly
  • Specimen grips can be installed in testing systems at three different angle settings (0°, 45°, and 90°).
  • T-slots in the lower part of the basic body serve as a mounting for the T-slot system, enabling the accommodation of smaller load cells, specimen grips, test tools, and fixtures (except hydraulic grips, type 8392, Fmax 10 kN).
  • Prismatic jaws (jaws with V-slots) can be rotated and have two-fold use: For round and flat specimens or for round specimens with various diameters (jaws with crosswise arranged V-slots)
  • The upper and lower grips can be opened and closed either individually or together via remote control or PC.
  • The ratio between gripping and tensile forces can be adjusted individually, ensuring that the specimen is held securely (at maximum tensile force approximately double gripping force is required).
  • Hydraulic grips are designed to offer optimal specimen feeding.
  • An adjustable, scaled stop ensures precise vertical specimen gripping for manual special feeding.
  • For easier specimen centering, a centering stop can be used.
  • For safety reasons, specimen tongs can be used to insert the specimen.

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.

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 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).

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.

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.

Hydraulic grips

Hydraulic specimen single actuator specimen grips

Fmax 50 kN, 100 kN, 250 kN

  • Specimen material
    Ferrous and non-ferrous metals, hard and toughened plastics, wood, and similar materials
  • Specimen shape
    Round and flat specimens (strips and dumbbells)
  • Type of loading
    Tensile, compression, alternating load

Advantages and features

  • Defined force application ensures optimum gripping of sensitive materials.
  • Unwanted forces acting on the specimen are compensated for during the gripping process by Zwick’s "Force Constant Hold" feature when the grips are used in conjunction with Zwick hydraulic power-packs, the testControl electronics, and testXpert II testing software.
  • Small load cells, specimen grips, test tools and fixtures can be quickly accommodated via the optional mounting unit and without having to dismantle the specimen grips.
  • Prismatic jaws (jaws with V-slots) can be rotated and have two-fold use: For round and flat specimens or for round specimens with various diameters (jaws with crosswise arranged V-slots)
  • Excentric offset between piston and piston rod allows specimen grips with short clamping lengths to be tested as well.
  • The upper and lower grips can be opened and closed either individually or together via remote control or PC.
  • For safety reasons, specimen tongs can be used to insert the specimen.

Function description

The hydraulic grip is a single actuator closing specimen grip. The specimen grip is set to the thickness of the specimen using a screw unit set.

Two horizontal T-slot pairs are found in the specimen grip. The larger slot is for insertion of the T-slotted system. The smaller slot is a guide for optional parts.

  • The following can be mounted as optional parts:
  • Connecting system
  • Specimen gripper
  • Centering stop

You can insert the specimen vertically and in the center using the specimen gripper. Using a specimen gripper helps minimize the risk of injury when inserting and removing specimens from the specimen grips. Such risks are the pinching of body parts between the jaws or the burning of body parts on hot specimens.

Technical data, Fmax 50 kN

Item no.

317176[1]

Type

8801

Test load, max. (Fmax)

50

kN

Closing force, max. (at 300 bar)

100

kN

Pressure, min.

12

bar

Pressure, max.

300

bar

Height

205

mm

Width

365

mm

Depth

132

mm

Width with screw unit, open all the way

395

mm

Adjustability of the opposing jaw

Stepless

Gripping travel

35

mm

Opening width, max./specimen thickness

See table of jaws (specimen thickness)

Gripping of the specimen

The specimen must be gripped above at least 2/3 of the jaw height.

Weight per specimen grip (without jaws)

37

kg

Connection

Ø 36/60[2]

mm

Ambient temperature

+10 ... +35

°C

Scope of delivery

2

pieces

  1. Recommended and approved for strain rate control in accordance with standards DIN EN ISO 6892-1:2009 and ASTM E 8 – 09.
  1. These specimen grips can be offered with a 36-mm or 60-mm connection (selection made using parts list alternatives).

Technical data, Fmax 100 kN

Item no.

317178

Type

8802

Operating principle

Single-actuator

Test load, max. (Fmax)

100

kN

Closing force, max. (at 300 bar)

255

kN

Pressure, max.

300

bar

Height

303

mm

Width

423

mm

Depth

170

mm

Width with screw unit, open all the way

461

mm

Opposing jaw can be adjusted

Stepless

Gripping travel

35

mm

Gripping of the specimen

The specimen must be gripped above at least 2/3 of the jaw height

Weight per specimen grip (without jaws)

70

kg

Connection

Ø 60

mm

Ambient temperature

+10 to +35

°C

Scope of delivery

2

pieces

Technical data, Fmax 250 kN

Item No.

317180

Type

8803

Operating Principle

One-sided closing

Test load Fmax

250

kN

Pressure, max.

480

bar

Closing force at max. pressure

410

kN

Height

303

mm

Width

423

mm

Width (screw unit, open all the way)

423 (461)

mm

Depth

170

mm

Opposing jaw can be adjusted

Stepless

Gripping travel

70

mm

Gripping of the specimen

The specimen must be gripped above at least 2/3 of the jaw height.

Connection

Ø 60

mm

Ambient temperature

+10 to +35

°C

Weight per specimen grip (without jaws), approx.

70

kg

Scope of delivery

2

pieces

Hydraulic grips

Hydraulic specimen grips, double-sided closing

Fmax 50 kN, 100 kN, 250 kN
  • Specimen material
    Ferrous and non-ferrous metals, hard and toughened plastics, and similar materials
  • Specimen shape
    Round and flat specimens (strips and dumbbells)
  • Type of loading
    Tensile, compression, alternating load

Advantages and features

  • Defined force application ensures optimum gripping of sensitive materials.
  • Unwanted forces acting on the specimen are compensated for during the gripping process by Zwick’s "Force Constant Hold" feature when the grips are used in conjunction with Zwick hydraulic power-packs, the testControl electronics, and testXpert II testing software.
  • Small load cells, specimen grips, test tools and fixtures can be quickly accommodated via the optional mounting unit and without having to dismantle the specimen grips.
  • Prismatic jaws (jaws with V-slots) can be rotated and have two-fold use: For round and flat specimens or for round specimens with various diameters (jaws with crosswise arranged V-slots)
  • Excentric offset between piston and piston rod allows specimen grips with short clamping lengths to be tested as well.
  • The upper and lower grips can be opened and closed either individually or together via remote control or PC.
  • For safety reasons, specimen tongs can be used to insert the specimen.
  • The symmetrically closing jaws save time needed to adjust to varying specimen thicknesses and ensure that the specimen is held exactly in the test axis.

Function description

Two-sided closing specimen grips always close symmetrically with respect to the tensile axis. This means the specimen is clamped in a precise axial position. It is not necessary to set the thickness. This is a big advantage, above all, for soft specimens or if specimen thickness changes.

Two horizontal T-slot pairs are found in the specimen grip. The larger slot is for insertion of the T-slotted system. The smaller slot is a guide for optional parts.

  • The following can be mounted as optional parts:
  • Connecting system
  • Specimen gripper
  • Centering stop

You can insert the specimen vertically and in the center using the specimen gripper. Using a specimen gripper helps minimize the risk of injury when inserting and removing specimens from the specimen grips. Such risks are the pinching of body parts between the jaws or the burning of body parts on hot specimens.

Technical data, Fmax 50 kN

Item no.

313646[1]

Type

8494

Test load, max. (Fmax)

50

kN

Closing force, max. (at 300 bar)

100

kN

Pressure, min.

12

bar

Pressure, max.

300

bar

Height

205

mm

Width

386

mm

Depth

132

mm

Width with screw unit, open all the way

-

mm

Opposing jaw can be adjusted

-

Gripping travel

35

mm

Opening width, max./specimen thickness

See table of jaws (specimen thickness)

Gripping of the specimen

The specimen must be gripped above at least 2/3 of the jaw height

Weight per specimen grip (without jaws)

37

kg

Connection

Ø 36/60[2]

mm

Ambient temperature

+10 to +35

°C

Scope of delivery

2

pieces

  1. Recommended and approved for strain rate control in accordance with standards DIN EN ISO 6892-1:2009 and ASTM E8 – 09
  1. These specimen grips can be offered with a 36 mm or 60 mm connection (selection made using parts list alternatives).

Technical data, Fmax 100 kN

Item no.

313760

Type

8592

Test load, max. (Fmax)

100

kN

Operating principle

Double-actuator

Closing force, max. (at 300 bar)

250

kN

Pressure, max.

300

bar

Height

303

mm

Width

479

mm

Depth

170

mm

Width with screw unit, open all the way

461

mm

Gripping travel

70

mm

Gripping of the specimen

The specimen must be gripped above at least 2/3 of the jaw height

Weight per specimen grip (without jaws)

70

kg

Connection

Ø 60

mm

Ambient temperature

+10 to +35

°C

Scope of delivery

2

pieces

Technical data, Fmax 250 kN

Item No.

313782

Type

8594

Test load (Fmax)

250

kN

Operating Principle

Two-sided closing

Closing force, max. (at 480 bar)

410

kN

Pressure, max.

480

bar

Height

303

mm

Width

479

mm

Depth

170

mm

Gripping travel

35

mm

Gripping of the specimen

The specimen must be gripped above at least 2/3 of the jaw height.

Connection

Ø 60

mm

Ambient temperature

+10 to +35

°C

Weight per specimen grip (without jaws), approx.

70

kg

Scope of delivery

2

pieces

Applications

  • Specimen material:
    Ferrous and non-ferrous metals, pattern sheet metal, sintered metal materials, hard metals, metal-ceramic composites, hard and reinforced plastics, and similar materials
  • Specimen shape:
    Flat specimens, round specimens (strips and dumbbells), in particular even small specimens with short clamping lengths.
  • Type of loading:
    Tensile, compression, alternating load

Advantages and features

  • The clamping principle is also suitable for short clamping lengths (patent applied for). Limiting factor is the maximum permitted surface pressure of 1,000 N/mm² on the gripped surfaces.
  • Vertically braced arrangement during the test makes these specimen grips suitable for cyclic load and strain-controlled tests also.
  • Free field of view (including with short clamping lengths) for optical and mechanical extensometers.
  • Unwanted forces acting on the specimen are compensated for during the gripping process by Zwick’s "Force Constant Hold" feature when the grips are used in conjunction with Zwick hydraulic power-packs, testControl and testXpert II testing software.
  • The optional mounting unit can easily accommodate small load cells, specimen grips, test tools and fixtures without having to dismantle the specimen grips.
  • 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.
  • For safety reasons, a specimen gripper canbe used to insert very short specimen into the gripping area.
  • The grip position can be accurately reproduced (repeat accuracy of grip position of ±0.01 mm is possible) thanks to the guide in specimen grips type 8495 (Fmax 50 kN and 70 kN).

Function description

Two-sided closing specimen grips always close symmetrically with respect to the tensile axis. This means the specimen is clamped in a precise axial position. It is not necessary to set the thickness. This is a big advantage, above all, for soft specimens or if specimen thickness changes.

The jaws are supported and held parallel via a third actuator. This patented process ensures that even specimens with short clamping lengths can be held securely.

Two different stopper systems (depending on the type/shape of specimen) ensure exact alignment of the specimen with the tensile axis.

The Zwick T-slotted system makes it possible for you to adapt additional test tools.

Technical overview of hydraulic grips for short clamping-lengths

Technical data, Fmax 50 kN and 70 kN

Item No.

Type

8495

8495

Operating principle

Double-actuator

Double-actuator

Test load, max. (Fmax)

50

70

kN

Closing force, max. (at 300 bar)

110

110

kN

Pressure, max.

300

300

bar

Height, approx.

316

353

mm

Width, approx.

413

413

mm

Depth, approx.

258

258

mm

Standard opening width, max.

34

34

mm

Permissible surface pressure on jaw, max.

Grip-to-grip separation, approx.

6

6

mm

Weight per specimen grip (without jaws), approx.

Connection

Ø 36

Ø 60

mm

Ambient temperature

+10 to +35

+10 to +35

°C

Scope of delivery

2

2

pieces

Technical data, Fmax 150 kN and 250 kN

Item no.

046496[1]

046873[1] [2]

Type

8589

8589

Test load, max. (Fmax)

150

250

kN

Operating principle

Double-actuator

Double-actuator

Closing force, max.

275

420

kN

Pressure, max.

300

400

bar

Permissible surface pressings per unit area on the jaw, max.

1,000

N/mm2

Grip-to-grip separation, min.

15

15

mm

Height, approx.

490

490

mm

Width, approx.

570

570

mm

Depth, approx.

445

445

mm

Standard opening width, max.

59

59

mm

Weight per specimen grip (without jaws), approx.

215

215

kg

Connection

Ø 60

Ø 60

mm

Ambient temperature

+10 to +35

+10 to +35

°C

Scope of delivery

2

2

pieces

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

Hydraulic specimen grips for fleece and other compressible specimens

Fmax 10 kN (single-sided closing)

  • Specimen material
    Fleece, foam
  • Specimen shape
    Flat specimens, asymmetrical specimens
  • Type of loading
    Tensile

Advantages and features

  • Extra large opening for quick and easy insertion of highly compressible specimen.
  • Gripping force for safe holding of the specimen.
  • Dove-tail jaw-system enables easy, tool-free insert change. Easy side insertion into specimen grip and centering and fixing of jaws follows automatically.
  • Compact and space-saving design.
  • Quick and uncomplicated insertion of specimen: Exact location of the specimen is quickly preset with adjustable centering stop.
  • Defined force application ensures optimum gripping of sensitive materials.
  • Exactly reproducible contact force.
  • Short specimen can also be gripped due to the special design of the specimen grip.

Function description

The hydraulic grip is a single actuator closing specimen grip. The specimen grip is set to the thickness of the specimen using a screw unit set.

The oil pressure at the hydraulic power pack/hydraulic pump is set corresponding to the specimen grip's closing pressure. The control unit controls the closing and opening procedure. With a hydraulic pump, the specimen grips are controlled at the same time (opened or closed).

The separation of tensile and gripping forces ensures a constant gripping force over the course of the entire test sequence.

A specimen depth stop can be mounted and aligned in the additional slots of the jaw mounting resulting in fast alignment of the specimen.

Technical data, Fmax 10 kN

Item no.

320719[1] [2]

Type

8392

Operating principle/identification

For fleece and other compressible specimen

Test load, max. (Fmax)

10

kN

Closing force at 150 bar

20

kN

Pressure, min.

10

bar

Pressure, max.

150

bar

Height

152

mm

Width

359

mm

Depth

76

mm

Standard opening

78[3]

mm

Gripping travel

50

mm

Gripping of the specimen

The specimen must be gripped above at least 1/2 of the jaw height.

Weight per specimen grip (without jaws)

12.1

kg

Connection

Ø 20

mm

Ambient temperature

+10 to +35

°C

Scope of delivery

2

pieces

  1. Recommended and approved for strain rate control in accordance with standards DIN EN ISO 6892-1:2009 and ASTM E8 – 09
  1. Includes connecting hoses
  1. This standard opening width is the result of using jaws with 5-mm jaw strength.

Body Over Wedge Hydraulic Grips

Fmax 150 kN and 250 kN

Hydraulic grips
Hydraulic_250 kN_body over wedge specimen grips [BOW]_temperature chamber_+FO

Applications

  • Specimen material
    Fiber-reinforced composites, hard and reinforced plastics, ferrous and non-ferrous metals, structural sheet metal, metal-ceramic composites, composites, and other materials.
  • Specimen shape
    Flat, round
  • Type of loading
    Tensile, compression, alternating load

Advantages and features

  • Excellent reproducible grip position and specimen alignment to the test axis Ideal for tests on specimens which are sensitive to transverse forces
  • Ideal for tensile, compression, and alternating load tests
  • No differential movement of jaws with increased test load (parallel clamping grips)
  • Symmetrical closing movement of the jaws saves set-up time in the event of frequent changes in specimen thickness
  • Open design for fast, easy specimen and jaw changes
  • Mechanical interfaces on the grips enable fast, easy attachment of additional fixtures, load cells, and specimen grips.
  • Unwanted forces acting on the specimen are compensated for during the gripping process by Zwick’s "Force Constant Hold" feature when the grips are used in conjunction with Zwick hydraulic power-packs, testControl, and testXpert II testing software.

Function description

Positively driven jaws ensure reproducible gripping of the specimen. The symmetrical design and high degree of stiffness of the main body of the grips make them ideal for tests that require accurate alignment of the specimen to the test axis.

Technical overview of body over wedge hydraulic grips

Technical data, Fmax 100 kN

Item No.

072865

072869

Type

8594

8594

8594

Test load, max. (Fmax)

100

100

100

kN

Operating principle

Wedge action

Wedge action

Wedge action

Closing force, max. (at 210 bar)

168

168

206

kN

Pressure, max.

210

210

210

bar

Height (when open)

266

345

514 (upper), 902 (lower)

mm

Outside diameter (at head)

200

200

mm

Clamping travel

Depending on jaw

Depends on jaw

Opening width, max. with jaws (for flat specimens)

39

39

mm

Opening width, max. with jaws (for round specimens)

24

24

mm

Specimen gripping

The specimen must be gripped over at least 2/3 of the jaw height.

The specimen must be gripped over at least 2/3 of the jaw height.

Weight per specimen grip (without jaws)

62.5

56.6

93 (upper), 113.6 (lower)

kg

Connection interface

Flange

Flange

Connection

Ø TK 220

Ø 60

Ø TK 220

Coolant water connection

-

Hose connector 1/8

Condensed water connection

-

Hose connector 1/8

Ambient temperature

+4 to +35

+4 to +35

-70 to +250

°C

Scope of delivery

2

2

2

pieces

Technical data, Fmax 250 kN

Item No.

072871

Type

8594

8594

8594

Test load, max. (Fmax)

250

250

250

kN

Operating principle

Wedge action

Wedge action

Wedge action

Closing force, max. (at 210 bar)

478

478

478

kN

Pressure, max.

210

210

210

bar

Height (when open)

339.7

408.7

627 (upper), 931 (lower)

mm

Outside diameter (at head)

280

mm

Clamping travel

Depends on jaw

Max. opening width with jaws (for flat specimens)

40

mm

Max. opening width with jaws (for round specimens)

30

mm

Specimen gripping

The specimen must be gripped over at least 2/3 of the jaw height.

Weight per specimen grip (without jaws), approx.

102

113

160 (upper), 179 (lower)

kg

Connection interface

Flange

Connection

Ø TK 220

Ø 60

Coolant water connection

-

Condensed water connection

-

Ambient temperature

+4 to +35

+4 to +35

-70 to +250

°C

Scope of delivery

2

2

2

pieces

Hydraulic wedge grips for servohydraulic testing machines

Body Over Wedge for servohydraulic testing machines

The "body over wedge" hydraulic grips for servo-hydraulic testing machines provide a high level of operating convenience.

When used with servo-hydraulic testing machines they are connected to the existing pressurized oil supply. A small power pack is required for use in static materials testing machines.

Advantages and features of hydraulic specimen grips for servohydraulics

  • Suitable for static tensile and compression tests and for fatigue tests under pulsating and alternating loads
  • Optionally available for superimposed torsion loading
  • Nominal forces 25, 100, 250 and 500kN
  • Interchangeable jaws for flat and round specimens of different dimensions
  • Radial jaw guides prevent unwanted axial stresses in the specimen
  • side-opening design for easy specimen change
  • adjustable gripping pressure for ‘soft’ specimens such as wood and plastics.

Technical data, Fmax 25 kN

Wedge grips

Dynamic nominal force

±25

±25

kN

Torsional moment

±250

±250

Nm

Temperature range

+4 to +35

-70 to +250

°C

Design pressure

210

210

bar

Max. specimen diameter

16

16

mm

Max. specimen thickness

14

14

mm

Installation height

166

[1]

mm

Specimen grip diameter

110

110

mm

Weight of one grip

8

10

kg

Connection size

Ø70; 6 x M8

Ø70; 6 x M8

Item No.

1002919

1002920

  1. Upon request: the height depends on the temperature chamber used.
  • Specimen grips consist of 2 grip heads
  • Set of jaws and grip control unit additionally required

Technical data, Fmax 100 kN

Wedge grips

Dynamic nominal force

±100

±100

kN

Torsional moment, max. (Mmax)

-

-

Nm

Design pressure

210

210

bar

Max. specimen diameter

24

24

mm

Max. specimen thickness

26.5

26.5

mm

Specimen thickness, max.

26.5

mm

Installation height

232

[1]

mm

Specimen grip diameter

200

200

mm

Weight per grip unit with jaws, approx.

34.5

67

kg

Connection size

Ø105, 6 x M10

Temperature range

+4 to +35

-70 to +250

°C

Item No.

088933

088935

  1. Upon request: the height depends on the temperature chamber used.
  • Specimen grips consist of 2 grip heads
  • Set of jaws and grip control unit additionally required

Technical data, Fmax 250 kN

Wedge grips

GR0250.50.07

GR0250.50.08

Dynamic nominal force

±250

±250

kN

Torsional moment

-

-

Nm

Temperature range

+4 to +35

-70 to +250

°C

Design pressure

210

210

bar

Max. specimen diameter

30

30

mm

Max. specimen thickness

30

30

mm

Installation height

325

[1]

mm

Specimen grip diameter

280

280

mm

Weight of one grip

90

190

kg

Connection size

Ø165; 12 x M16

Ø165; 12 x M16

Item No.

088934

088936

  1. Upon request: The height depends on the temperature chamber used.
  • Specimen grips consist of 2 grip heads
  • Set of jaws and grip control unit additionally required

Downloads

Hydraulic grips

Hydraulic Specimen Grips for Temperature Chambers

Fmax 100 kN (single-sided closing)

  • Specimen material
    Ferrous and non-ferrous metals, hard and toughened plastics, wood, and similar materials
  • Specimen shape
    Round and flat specimens (strips and dumbbells)
  • Type of loading
    Tensile, compressive, and alternating loads up to max. 100 kN

Advantages and features

  • Prismatic jaws can be rotated and be use for both round and flat specimens.
  • A standard centering stop can be used to easily center the specimen.
  • Small load cells, specimen grips, test tools and fixtures can be quickly accommodated via the optional mounting unit and without having to dismantle the specimen grips.

Function description

The hydraulic grip is a single actuator closing specimen grip. The specimen grip is set to the thickness of the specimen using a screw unit set.

The specimen grip is specifically designed for use in temperature chambers: it has a compact overall height, can be used in an extended temperature range, and has a special connector.

Technical data, Fmax 100 kN

Item no.

318985

Type

8592

Test load, max. (Fmax)

100

kN

Closing force, max. at 250 bar

216

kN

Pressure, min.

50

bar

Pressure, max.

250

bar

Height

226

mm

Width

406

mm

Depth

210

mm

Opening width, max.

38

mm

Gripping of the specimen

The specimen must be gripped over the entire jaw height.

Weight per specimen grip (without jaws), approx.

87.5

kg

Connection

Ø 60

mm

Ambient temperature

-55 to +250

°C

Scope of delivery

2

pieces

Applications

  • Specimen material
    Geotextiles, geo-fabrics, geo-laminates, fleece, woven goods, felts, and technical textiles
  • Specimen shape
    Strip specimens
  • Type of loading
    Tensile

Advantages and features

  • Dove-tail jaw system enables easy, tool-free insert change.
  • The specimen grip can also hold sensitive textile specimens (for example, glass fabrics and coated fabrics) through an adjustable, high closing force that is applied by means of tandem cylinder.
  • Operator safety combined with rapid positioning when inserting the specimen via a special work panel and positioning telescope rails into the gripping area.
  • Textiles with coarse surface structures can be securely held and tested via quick change jaws with different jaw surfaces.
  • Ideal test system for technical textiles and geotextiles in conjunction with a non-contact optical extensometer.
  • Small load cells, specimen grips, test tools and fixtures can be quickly accommodated via the optional mounting unit and without having to dismantle the specimen grips.
  • Contact pressure can be reproduced exactly
  • Optimized gripping of sensitive materials is guaranteed by a defined load application.

Function description

The use of a tandem actuating cylinder allows uniform surface pressure to be achieved over the entire gripping area. These hydraulic grips are single-actuating. Specimen thickness adjustment is performed via the steplessly adjustable opposing jaw.

Textile specimens can be gripped in a gripping rail easily and without significant deformation using a specimen work panel. The specimen is then guided by means of the rail into a telescopic slide rail, allowing specimens to be inserted perpendicularly and centrically so the operator does not need to reach into the gripping area.

The required specimen grip closing pressure is set on the hydraulic power pack.

Technical data

Item no.

317677

317669

316734

Type

8393

8493

8593

Test load, max. (Fmax)

50

100

250

kN

Closing force, max.

At 450 bar: 300

At 350 bar: 600

At 480 bar: 1200

kN

Pressure, min.

50

50

50

bar

Pressure, max.

450

350

480

bar

Height

255

340

352

mm

Width

390

500

550

mm

Depth

260

315

345

mm

Opening width, max. (with jaws)

35

35

35

mm

Gripping of the specimen

The specimen must be gripped above at least 2/3 of the jaw height

The specimen must be gripped above at least 2/3 of the jaw height

The specimen must be gripped above at least 2/3 of the jaw height

Weight per specimen grip (without jaws)

65

160

235

kg

Connection

Ø 36

Ø 60

Ø 60

mm

Ambient temperature

+10 to +35

+10 to +35

+10 to +35

°C

Scope of delivery

2

2

2

pieces

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