Pneumatic Grips

Recommended for strain rate control in accordance with standards DIN EN ISO 6892-1:2009 and ASTM E8–09 

  • Pneumatic specimen grips are particularly useful when a variety of materials, especially those sensitive to clamping forces, must be gripped with minimum amount of changeover. The gripping force is generated by pneumatic cylinders acting directly on the jaws or via a lever system. 
  • Pneumatic specimen grips are ideal if a high specimen throughput is required.
Pneumatik-Probenhalter

Significant Advantages and Features

Advantages and features

  • The separation of tensile and gripping forces ensures a constant gripping force over the course of the entire test sequence. For specimens prone to shrinkage, the gripping force is uniformly maintained by constant pneumatic pressure.
  • The contact force on the specimen is reproducible.
  • Gripping-sensitive specimens can be held securely by adjusting the pneumatic pressure, avoiding jaw breaks.
  • The primary stress is the tensile load and it can be static or pulsating. Depending on the type of grips, compression and alternating load tests may be performed.
  • Depending on the design principle, the gripping area is freely accessible.
  • The larger grips can remain in place while small load cells, specimen grips, test fixtures and test devices are attached without having to dismantle the specimen grips—a great time saver.
  • There are a wide range of jaws with respect to material, surface, and area of the clamping surface.
  • Pneumatic grips offer a low-cost alternative to hydraulic grips.

Types

There are three types of Zwick pneumatic grips:

  • Single-actuator
    Single-actuator pneumatic grips can be used for the symmetrical and asymmetrical gripping of specimens (e.g., for shear strength tests). Some of the single-actuator pneumatic grips up to 1 kN have an integral control valve—no additional external pneumatic control unit required.
  • Double-actuator
    Double-actuator pneumatic grips always close symmetrically with respect to the tensile axis. This eliminates the need for thickness adjustment: This is a big advantage, above all, for soft specimens and/or if specimen thickness changes.
  • For temperature chambers (single- and double-actuator)
    These pneumatic grip are single- or double-actuator specimen grips that are specifically designed for use in temperature chambers.

Pneumatic Specimen Grips with Integrated Control Valve, Single-Actuator

Fmax 20 N, 50 N, 100 N and 200 N

Range of application

  • Specimen material
    Films/foils, paper, fleece, elastomers
  • Specimen shape
    Flat specimens (strip or dumbbell specimens)
  • Type of loading
    Tensile, compression, alternating load

Advantages and features

  • Uniform test requirements through reproducible gripping force on the specimens.
  • Constant gripping force securely holds even specimens that lose thickness during testing.
  • The toggle switch enables fast opening and closing.
  • Adjustable opposing jaws allows eccentric specimen insertion, enabling asymmetrical and symmetrical gripping of specimens.
  • An insertion device (included) makes it easier to insert the specimen (for example yarn) centrally.
  • Special features for pneumatic grips type 8195, Fmax 100 N and 200 N
  • Dove-tail jaw system enables easy, tool-free insert change. Easy side insertion of jaws into specimen grip and centering and fixing of jaws occur automatically.

Function description

An additional pneumatic control unit is not necessary. It is already integrated in the specimen grip.

The specimen grip has fixed jaws. Jaws cannot be changed. The jaws are opened and closed manually via the toggle switch on the specimen grip. It is not possible to change the compression force at the specimen grip.

The opposing jaw can be steplessly adjusted.

Fmax 20 N and 50 N

Item no.

318637

318639

Type

8195

8195

Operating principle/identification

With an integrated control valve

With an integrated control valve

Test load, max. (Fmax)

0.02

0.05

kN

Closing force, max. at 6 bar

50

100

N

Closing force, max. at 10 bar

140

200

N

Pressure, min.

4

4

bar

Pressure, max.

10

10

bar

Height

90

90

mm

Width

77

77

mm

Width with hand wheel/pneumatic unit

107.5

112

mm

Depth

60

60

mm

Depth with toggle switch

108

108

mm

Gripping distance of pneumatically operated side

6

6

mm

Standard opening width, max.[1] (with jaws)

11

11

mm

Gripping of the specimen

The specimen must be gripped over the entire jaw height.

The specimen must be gripped over the entire jaw height.

Weight per specimen grip, approx.

380

405

g

Connection

Ø 8

Ø 8

mm

Ambient temperature

+10 to +35

+10 to +35

°C

Scope of delivery

2

2

pieces

Insertion device

included

included

Jaws supplied

Surface

Vulkollan, smooth

Vulkollan, smooth

Gripping area (H x W)

30 x 60

30 x 60

mm

Hardness

95 Shore A

95 Shore A

  1. The standard opening width is the result of using jaws with 5-mm jaw strength.

Fmax 100 N and 200 N

Item no.

353095

353096

Type

8195

8195

Test load, max. (Fmax)

0.1

0.2

kN

Closing force, max. at 6 bar

200

400

N

Closing force, max. at 10 bar

360

700

N

Pressure, min.

3

3

bar

Pressure, max.

10

10

bar

Height

95

95

mm

Width

100

100

mm

Width (with hand wheel/pneumatic unit)

141.5

141.5

mm

Depth

60

60

mm

Depth (with toggle switch)

109

109

mm

Gripping distance of pneumatically operated side

4

4

mm

Standard opening width, max.[1] With jaws

6

6

mm

Gripping of the specimen

The specimen must be gripped over the entire jaw height.

The specimen must be gripped over the entire jaw height.

Weight per specimen grip (without jaws), approx.

520

520

g

Connection

Ø 8

Ø 8

mm

Ambient temperature

+10 to +35

+10 to +35

°C

Scope of delivery

2

2

pieces

Jaws supplied

Surface

Does not include jaws

Does not include jaws

Gripping area (H x W)

-

-

Hardness

-

-

  1. The standard opening width is the result of using jaws with 5-mm jaw strength.

Pneumatic specimen grip with an integrated control valve, single-actuator

Fmax 1 kN

Range of application

  • Specimen material:
    Foil/film, paper, soft wires, fleece, fabrics, elastomer
  • Specimen shape:
    Flat specimens (strip or dumbbell specimens)
  • Type of loading:
    Tensile, compression, alternating load

Advantages and Features

  • Uniform test requirements through reproducible gripping force on the specimens.
  • Constant gripping force securely holds even specimens that lose thickness during testing.
  • The toggle switch enables fast opening and closing.
  • Dove-tail ja system enables easy, tool-free insert change. Easy side insertion of jaws into specimen grip and centering and fixing of jaws occur automatically.
  • Adjustable opposing jaws allows eccentric specimen insertion, enabling asymmetrical and symmetrical gripping of specimens.
  • Optional specimen stops enable the specimen to always be placed centrally in the specimen grip
  • An insertion device (optional) makes it easier to grip the specimen (for example, yarn) centrally.
  • Ample space for insertion of specimen and good accessibility.

Function description

An additional pneumatic control unit is not necessary. It is already integrated in the specimen grip.

The jaws are opened and closed manually via the toggle switch on the specimen grip. It is not possible to change the compression force at the specimen grip.

The opposing jaw can be steplessly adjusted by 5.5 mm.

Technical data, Fmax 1 kN

Item no.

057661

057660

Type

8195

8195

Operating principle/identification

With an integrated control valve

With an integrated control valve

Test load, max. (Fmax)

1

1

kN

Closing force, max. at 6 bar

1

1

kN

Closing force, max. at 10 bar

1.7

1.7

kN

Pressure, min.

3

3

bar

Pressure, max.

10

10

bar

Height

108

108

mm

Width

148

148

mm

Width with hand wheel/pneumatic unit

210

210

mm

Depth

60

60

mm

Gripping distance of pneumatically operated side

4

4

mm

Standard opening width, max.[1] With jaws

6

6

mm

Gripping of the specimen

The specimen must be gripped above at least 1/3 of the jaw height.

The specimen must be gripped above at least 1/3 of the jaw height.

Weight per specimen grip (without jaws), approx.

1.08

1.24

kg

Connection

Ø 8

Ø 20

mm

Ambient temperature

+10 to +35

+10 to +35

°C

Scope of delivery

2

2

pieces

  1. The standard opening width is the result of using jaws with 5-mm jaw strength.

Pneumatic specimen grips, double-actuator

Fmax 200 N, 1 kN, 2.5 kN

Range of application

  • Specimen material
    Plastic, paper, textiles, elastomers, wood, foil/films, glued specimens
  • Specimen shape
    Round and flat specimens (strips or dumbbells), asymmetrical specimens
  • Type of loading
    Tensile, compression, alternating load

Pneumatic specimen grip Fmax 2.5 kN is also ideal for insulating material.

Advantages and features

  • Dove-tail jaw system enables easy, tool-free insert change. Easy side insertion of jaws into specimen grip and centering and fixing of jaws occur automatically.
  • Uniform test requirements through reproducible gripping force on the specimens.
  • Constant gripping force securely holds even specimens that lose thickness during testing.
  • The specimen thickness is adjustable with a screw.
  • Precise positioning of the specimen is simplified because of the adjustable centering stops with scale and markings on the jaws (centering stop optionally available).

Function description

Stepless adjustment of the grip closing pressure is available via a pneumatic control unit, ensuring secure clamping of a wide range of materials. The grips can be opened and closed via foot switches or the testing system remote control for greater operating convenience.

Counter-jaws can have stepped or stepless adjustment depending on model.

The opening width can be adjusted from 0 to 20 mm.

Fmax 200 N

Item no.

316690

316692

Type

8097

8097

Operating principle/identification

Opposing jaw can be adjusted step by step

Opposing jaw adjustable steplessly and in steps

Test load, max. (Fmax)

0.2

0.2

kN

Closing force, max. at 6 bar

340

340

N

Closing force, max. at 10 bar

570

570

N

Pressure, min.

0.5

0.5

bar

Pressure, max.

10

10

bar

Height

95

95

mm

Width

207

207

mm

Depth

32

32

mm

Depth with connection unit

74

74

mm

Gripping distance of pneumatically operated side

10.5

10.5

mm

Standard opening width, max.[1] With jaws

20

20

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.

Weight per specimen grip (without jaws), approx.

1.07

1.16

kg

Connection

Ø 8

Ø 8

mm

Ambient temperature

+10 to +35

+10 to +35

°C

Scope of delivery

2

2

pieces

  1. The standard opening width is the result of using jaws with 5-mm jaw strength.

Fmax 1 kN

Item no.

014772

014774

Type

8197

8197

Test load, max. (Fmax)

1

1

kN

Closing force at 6 bar, max.

1.7

1.7

kN

Closing force at 10 bar, max.

2.8

2.8

kN

Pressure, min.

0.5

0.5

bar

Pressure, max.

10

10

bar

Height

95

95

mm

Mounting height

120

120

mm

Width

238

242

mm

Depth

80

80

mm

Depth with connection unit

121

121

mm

Gripping distance of pneumatically operated side

10.5

10.5

mm

Standard opening width, max.[1] With jaws

20

20

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.

Weight per specimen grip (without jaws), approx.

1.68

1.76

kg

Connection

Ø 20

Ø 20

mm

Ambient temperature

+10 to +35

+10 to +35

°C

Scope of delivery

2

2

pieces

  1. The standard opening width is the result of using jaws with 5-mm jaw strength.

Fmax 2.5 kN

Item no.

316449[1]

316451[1]

Type

8197

8197

Operating principle/identification

Opposing jaw can be adjusted step by step

Opposing jaw adjustable steplessly and in steps

Test load, max. (Fmax)

2.5

2.5

kN

Closing force at 6 bar, max.

3.6

3.6

kN

Closing force at 10 bar, max.

6

6

kN

Pressure, min.

0.5

0.5

bar

Pressure, max.

10

10

bar

Height

95

95

mm

Installation height

135

mm

Width

238

242

mm

Depth

110

110

mm

Depth with connection unit

151

151

mm

Gripping distance of pneumatically operated side

10.5

10.5

mm

Standard opening width, max.[2] With jaws

20

20

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.

Weight per specimen grip (without jaws), approx.

2.4

2.5

kg

Connection

Ø 20

Ø 20

mm

Ambient temperature

+10 to +35

+10 to +35

°C

Scope of delivery

2

2

pieces

  1. When working with optical extensometers, you must ensure that the area to be measured is not covered by the pneumatic actuator.
  1. The standard opening width is the result of using jaws with 5-mm jaw strength.

Pneumatic specimen grips, double-actuator

Fmax 5 kN, 10 kN, and 30 kN

Range of application

  • Specimen material
    Metals, plastics, paper, textiles, elastomers, wood, foil/films, glued specimens
  • Specimen shape
    Round and flat specimen, asymmetrical specimen
  • Type of loading
    Tensile, compression, alternating load
Pneumatic specimen grip Fmax 5 kN is also ideal for insulating material.

Advantages and features

  • Specimen grip achieves high gripping force thanks to special design principle.
  • Dove-tail jaw system enables easy, tool-free insert change. Easy side insertion of jaws into specimen grip and centering and fixing of jaws occur automatically.
  • Uniform test requirements through reproducible gripping force on the specimens.
  • Constant gripping force securely holds even specimens that lose thickness during testing.
  • The specimen thickness is adjustable with a screw.
  • Quick and uncomplicated insertion of specimen: Exact location of the specimen with scale is quickly preset with adjustable centering stop.
  • Small load cells, specimen grips, test tools and test fixtures can quickly attach to them via the optional mounting unit without having to dismantle the specimen grips.

Function description

Stepless adjustment of the grip closing pressure is available via a pneumatic control unit, ensuring secure clamping of a wide range of materials. The grips can be opened and closed via foot switches or the testing system remote control for greater operating convenience.

The opposing jaw can be steplessly adjusted.

The opening width can be adjusted from 0 ... 24 mm.

Fmax 5 kN

Item no.

320721[1]

Type

8397

Test load, max. (Fmax)

5

kN

Closing force at 6 bar, max.

9

kN

Closing force at 10 bar, max.

16

kN

Pressure, min.

1

bar

Pressure, max.

10

bar

Height

163.5

mm

Width

266

mm

Depth

84

mm

Depth with connection unit

164

mm

Gripping distance of pneumatically operated side

12.5

mm

Standard opening width, max.[2] With jaws

24

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), approx.

8.2

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 E 8 – 09.
  1. The standard opening width is the result of using jaws with 5-mm jaw strength.

Fmax 10 kN

Item no.

317654[1]

Type

8397

Test load, max. (Fmax)

10

kN

Closing force at 6 bar, max.

18

kN

Closing force at 10 bar, max.

30

kN

Pressure, min.

0.5

bar

Pressure, max.

10

bar

Height

164

mm

Width

377

mm

Depth

84

mm

Depth with connection unit

137

mm

Gripping distance of pneumatically operated side

12.5

mm

Standard opening width, max.[2] With jaws

24

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), approx.

10

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. The standard opening width is the result of using jaws with 5-mm jaw strength.

Fmax 30 kN

Item no.

317588[1]

Type

8497

Test load, max. (Fmax)

30

kN

Closing force at 6 bar, max.

35

kN

Closing force at 10 bar, max.

58

kN

Pressure, min.

0.5

bar

Pressure, max.

10

bar

Height

176.5

mm

Width

368

mm

Depth

112

mm

Depth with connection unit

143

mm

Gripping distance of pneumatically operated side

12.5

mm

Standard opening width, max.[2] With jaws

24

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), approx.

15

kg

Connection

Ø 36

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. The standard opening width is the result of using jaws with 5-mm jaw strength.

Pneumatic specimen grips, double-actuator

In this next section you will find information about double-actuator pneumatic specimen grips, their range of application and more about the technical data and the various models offered by Zwick,
Pneumatic grips

Specimen grips with control valve can be mounted in different ways

Fmax 20 N

  • Specimen material
    Plastics, textiles, paper, and many other materials
  • Specimen shape
    Fibers, metallic filaments, films, fire wires
  • Type of loading
    Tensile (also pulsating)

Advantages and features

  • Very lightweight: 118 g
  • Closes symmetrically.
  • The toggle switch enables fast opening and closing.
  • The load cell is loaded precisely in the middle of the test axis thanks to the symmetrical design.
  • By attaching the control valves to the moving and base crossheads, force measurement influences are reduced to a minimum by the connecting hoses.
  • There are a variety of jaws available.

Function description

The jaws are secured via a threaded pin. They can be replaced without tools. The opening width is 5 mm.

The specimen grips is set by the factory so that it is in the test axis center (specimen thickness 0 mm).

The specimen grip is closed using compressed air via a single-acting pneumatic actuator. The specimen grip is opened with tension springs.

An additional pneumatic control unit is not necessary. It is included in the scope of delivery. The jaws are opened and closed by means of the toggle switch on the control valve, which can be mounted in different ways. The closing speed can be regulated by means of a throttle non-return valve. This makes gentle closing possible. This offers advantages in terms of zero-force control.

The maximum permissible closing pressure equals 8 bar (corresponds to 150 N closing force).

The closing force cannot be altered at the specimen grip. This is possible only by means of an additional pneumatic pressure limit valve (not included in the scope of supply).

Technical data, Fmax 20 N

Item no.

080489

Type

8095

Operating principle/identification

with control valve, can be mounted in different ways

Test load, max. (Fmax)

0.02

kN

Closing force at 6 bar, max.

115

N

Closing force at 8 bar, max.

150

N

Pressure, max.

8

bar

Height (with jaws)

102

mm

Width

57

mm

Depth

60

mm

Opening width, max. (with jaws)

5

mm

Gripping of the specimen

The specimen must be gripped over the entire jaw height.

Weight per specimen grip (without jaws), approx.

118

p

Connection

Ø 8

mm

Ambient temperature

+10 ... +35

°C

Scope of delivery

2[1]

piece

  1. Included in delivery: 2 control valves, can be mounted in different ways, with throttle non-return valve
Pneumatic grips

Pneumatic specimen grips, double-actuator

Fmax 200 N and 1 kN

  • Specimen material:
    plastics, paper, textiles, elastomers, wood, films
  • Specimen shape:
    round and flat specimens
  • Type of load:
    tensile, compression, alternating load

Advantages and features

  • Dove-tail jaw system enables easy, tool-free insert change.
  • The symmetrically closing jaws save time required for adjusting to varying specimen thicknesses and ensure that the specimen is held exactly in the middle of the test axis.

The specimen grip has a large opening width that makes the testing of thicker specimens also possible.

Technical data, Fmax 200 N and 1 kN

Item no.

313852

313874

Type

8187

8287

Test load, max. (Fmax)

0.2 to 0.1[1]

kN

Closing force, max. at 6 bar

0.2 to 0.1

kN

Closing force, max. at 10 bar

0.33 to 0.16

kN

Pressure, min.

1.5

bar

Pressure, max.

10

bar

Height

95

mm

Height

131

mm

Width

240

mm

Depth

65

mm

Depth with connection unit

156

mm

Width

202

mm

Depth

42

mm

Depth with connection unit

133

mm

Gripping distance of pneumatically operated side

12 to 22

12/22

mm

Standard opening width, max.[2] With jaws

12 to 22

12/22

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.

Weight per specimen grip (without jaws), approx.

1

2.8

kg

Connection

Ø 8

mm

Ambient temperature

+10 to +35

°C

Scope of delivery

2

2

pieces

  1. Clamping distance is adjustable from 0 - 12 mm to 0 - 22 mm. Thus, the closing force is reduced to 50%.
  1. The standard opening width is the result of using jaws with 5-mm jaw strength.
Pneumatic grips

Pneumatic specimen grips, double-actuator

Fmax 2.5 kN

  • Probenmaterial:
    Kunststoffe, Papier, Textilien, Elastomere, Holz, Folien, Dämmstoffe
  • Probenform:
    Rund- und Flachproben (Streifen- oder Schulterproben)
  • Beanspruchungsart:
    Zug, Druck, Wechsellast

Advantages and features

  • Compact design combined with high clamping force.
  • Symmetrical gripping of varying specimen thicknesses ensures that the specimen is held exactly in the middle of the test axis, saving time and reducing possible errors during insertion.
  • Elevated jaws above the basic body of the specimen grip enable a clear view and access for optical and mechanical extensometers even if gage lengths are short.
  • Nearly symmetrical weight distribution prevents transverse forces from being applied to the load cell.
  • Ample space between jaws and basic body enables ergonomic insertion and offers ample space for flexible specimen ends.
  • Dove-tail jaw system for fast and tool-free changing of jaws for respective application.
  • Gripping-sensitive specimens can be held securely by adjusting the pneumatic pressure, preventing jaw breaks.
  • Continuous pneumatic pressure enables gripping of specimen that lose thickness during the test.
  • For precise positioning of the specimen a standard adjustable centering stop is supplied.
  • The specimen grip is controlled via an independent hand or foot control unit. Alternatively, the specimen grip can be controlled via the testing system remote control. A computer-controlled unit is required.

Function description

The closing force is initialized via a centrally positioned pneumatic actuator. It transfers the closing movement via a steering lever to the parallel positioned jaws.

The jaws for the jaw mountings are permanently guided play free in the tensile direction via spring elements. The jaws are secured via a locating spring. You can replace the jaws without using tools.

Technical data, Fmax 2.5 kN

Item no.

038545

Type

8297

Test load, max. (Fmax)

2.5

kN

Closing force, max. at 6 bar

6.5

kN

Closing force, max. at 10 bar

10.5

kN

Pressure, min.

1.5

bar

Pressure, max.

10

bar

Height

170

mm

Height with specimen stop

182

mm

Width

210

mm

Depth

82

mm

Standard opening width, max.[1] With jaws

20

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), approx.

4.7

kg

Connection

Ø 20

mm

Ambient temperature

+10 ... +35

°C

Scope of delivery

2

pieces

  1. The standard opening width is the result of using jaws with 5-mm jaw strength.
Pneumatic grips_multiXtens

Pneumatic specimen grips, double-actuator

Fmax 10 kN, 20 kN

  • Specimen material:
    metals, films/foils, plastics, paper, textiles, elastomers, wood
  • Specimen shape:
    round and flat specimens
  • Type of load:
    tensile, compression, alternating load

Advantages and features

  • The symmetrically closing jaws save time required for adjusting to varying specimen thicknesses and ensure that the specimen is gripped exactly in the middle of the test axis.
  • Dove-tail jaw system enables easy, tool-free insert change. Easy side insertion into specimen grip and centering and fixing of jaws occur automatically.
  • Quick and uncomplicated insertion of the specimen: Exact location of the specimen with scale is quickly preset with adjustable centering stop.
  • Uniform test requirements through reproducible gripping force on the specimens
  • Constant gripping force also securely holds specimens that lose thickness during testing
  • The jaws close flush with the specimen grips. Specimens with small clamping lengths can also be gripped.
  • Small load cells, specimen grips, tools and fixtures can be quickly accommodated via the optional mounting unit and without having to dismantle the specimen grips.

Function description

  • A patented switching device is integrated in the specimen grip. It switches between the following, depending on the load:
  • High closing speed with a low closing force, and a
  • Low closing speed with high closing force

This switching takes place automatically as soon as the jaws meet the specimen.

This patented principle of closing force application makes very high closing forces possible in instances where sizes are compact and opening widths are large.

Precise positioning of the specimen is simplified because of the adjustable stop screws with scale (included in the delivery scope) and markings on the jaws.

The specimen grip has a large opening width that makes the testing of thicker specimens also possible.

Technical data, Fmax 10 kN and 20 kN

Item no.

353412[1]

320032[2]

Type

8397

8497

Test load, max. (Fmax)

10

20

kN

Closing force, max. at 6 bar

27

27

kN

Pressure, min.

2.5

2.5

bar

Pressure, max.

10

10

bar

Height

208

225

mm

Height with connector unit

230

247

mm

Width

242

242

mm

Depth

112

112

mm

Depth with connector unit/overhang

N/A

132

Gripping travel[3]

10

10

mm

Standard opening width, max. (with jaws)[4]

26

26

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.

Weight per specimen grip (without jaws), approx.

14

14

kg

Connection

Ø 20

Ø 36

mm

Ambient temperature

+10 to +35

+10 to +35

°C

Scope of delivery

2

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. Recommended and approved for strain rate control in accordance with standards DIN EN ISO 6892-1:2009 and ASTM E8 – 09
  1. See the diagram that depicts the correlation between the gripping travel and the specimen thickness/opening width
  1. The standard opening width is the result of using jaws with 5-mm jaw strength.
Pneumatic grips

Specimen grip with high gripping force

Fmax 20 kN

  • Specimen material:
    technical fabrics, metals, plastics, paper, textiles, elastomers, insulation materials, wood
  • Specimen shape:
    round and flat specimens
  • Type of load:
    tensile, compression, alternating load

Advantages and features

  • The specimen grip has an extremely high closing force and is particularly suited for technical fabrics.
  • The symmetrically closing jaws save time required for adjusting to varying specimen thicknesses and ensure that the specimen is gripped exactly in the middle of the test axis.
  • Dove-tail jaw system enables easy, tool-free insert change. Easy side insertion into specimen grip and centering and fixing of jaws occur automatically.
  • Quick and uncomplicated insertion of the specimen: Exact location of the specimen with scale is quickly preset with adjustable centering stop.
  • Uniform test requirements through reproducible gripping force on the specimens
  • Constant gripping force securely holds even specimens that lose thickness during testing.
  • The jaws close flush with the specimen grips. Specimens with small clamping lengths can also be gripped.
  • Small load cells, specimen grips, tools and fixtures can be quickly accommodated via the optional mounting unit and without having to dismantle the specimen grips.

Function description

Precise positioning of the specimen is simplified because of the adjustable stop screws with scale (included in the delivery scope) and markings on the jaws.

The specimen grip has a large opening width that makes the testing of thicker specimens also possible. The opening width is set manually.

An extremely high gripping force is achieved through a special design principle.

Technical data, Fmax 20 kN

Item no.

320712[1]

Type

8497

Test load, max. (Fmax)

20

kN

Closing force, max. at 6 bar

50

kN

Closing force, max. at 10 bar

68

kN

Pressure, min.

2

bar

Pressure, max.

8

bar

Height

225

mm

Height with connector unit

247

mm

Width

242

mm

Depth

112

mm

Depth with connector unit/overhang

132

mm

Gripping travel

8

mm

Standard opening width, max. (with jaws)[2]

20

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), approx.

14

kg

Connection

Ø 36

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. The standard opening width is the result of using jaws with 5-mm jaw strength.
Pneumatic grips

Pneumatic specimen grips, double-actuator

Fmax 50 kN, 100 kN

  • Specimen material:
    metals, plastics, textiles, elastomers, wood
  • Specimen shape:
    round and flat specimens
  • Type of load:
    tensile, compression, alternating load

Advantages and Features

  • The symmetrically closing jaws save time required for adjusting to varying specimen thicknesses and ensure that the specimen is gripped exactly in the middle of the test axis.
  • Dove-tail jaw system enables easy, tool-free insert change. Easy side insertion into specimen grip and centering and fixing of jaws occur automatically.
  • Quick and uncomplicated insertion of the specimen: Exact location of the specimen with scale is quickly preset with adjustable centering stop.
  • Uniform test requirements through reproducible gripping force on the specimens
  • Constant gripping force also securely holds specimens that lose thickness during testing
  • The jaws close flush with the specimen grips. Specimens with small clamping lengths can also be gripped.
  • Small load cells, specimen grips, tools and fixtures can be quickly accommodated via the optional mounting unit and without having to dismantle the specimen grips.

Function description

  • A patented switching device is integrated in the specimen grip. It switches between the following, depending on the load:
  • High closing speed with a low closing force, and a
  • Low closing speed with high closing force

This switching takes place automatically as soon as the jaws meet the specimen.

This patented principle of closing force application makes very high closing forces possible in instances where sizes are compact and opening widths are large.

Precise positioning of the specimen is simplified because of the adjustable stop screws with scale (included in the delivery scope) and markings on the jaws.

The specimen grip has a large opening width that makes the testing of thicker specimens also possible. The opening width is set manually.

Technical data, Fmax 50 kN and 100 kN

Item no.

320250[1]

320710[1]

Type

8497

8597

Test load, max. (Fmax)

50

100

kN

Closing force, max. at 6 bar

60

110

kN

Closing force, max. at 10 bar

100

170

kN

Pressure, min.

2

1.5

bar

Pressure, max.

10

10

bar

Height

306

341

mm

Width

390

390

mm

Depth

156

156

mm

Depth with carryover

186

190

mm

Gripping travel[2]

21

15

mm

Opening width/specimen thickness

See jaws table

See jaws table

Gripping of the specimen

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

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

Weight per specimen grip (without jaws), approx.

53

53

kg

Connection

Ø 36

Ø 60

mm

Ambient temperature

+10 to +35

+10 to +35

°C

Scope of delivery

2

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. See the diagram that depicts the correlation between the gripping travel and the specimen thickness/opening width

Wedge grips with pneumatic actuation

Fmax 10 kN

Wedge grips pneumatic grips body over wedge
  • Specimen material
    Plastics, reinforced plastics, fiber composites, wood and similar materials
  • Specimen shape
    Flat specimens (strip and dumbbell specimens)
  • Type of loading
    Tensile

This pneumatic specimen grip is ideas for use in temperature chambers

Advantages and features

  • Whether you are testing sensitive specimens or specimens with short clamping lengths, these symmetrically designed grips guarantee optimum clamping.
  • When determining the exact nominal strain the grip-to-grip separation does not depend on specimen diameter. This minimizes set-up time.
  • Reduced weight plus a compact design simplify handling, ensure short heating and cooling times in the temperature chamber. and enable long travel.
  • Absolutely secure gripping right from the start of the test for specimens prone to light slippage.
  • Comparable, reproducible test results. Thanks to their parallel gripping operation the pneumatic specimen grips transmit the test speed directly to the specimen.
  • The modular design of these grips allows easy changeover between operation with and without extensions for maximum possible travel. A possible conversion to the pneumatic version offers reliability in the future.

Function description

With specimen grips from the body over wedge series the position of the jaws remains constant in the test direction as the specimen is gripped. This means that the grip-to-grip separation does not depend on the specimen thickness.

The pneumatic specimen grips emphasis is on fast, reproducible and, most importantly, parallel gripping. Full gripping force is available right from the start, so that the static jaws transmit the test speed directly to the specimen.

Simple extensions are used in combination with temperature chambers The pneumatic actuator is positioned outside the chamber.

Technical data, Fmax 10 kN

Description

Value

Item no.

1004956[1]

Type

8304

Operating principle/identification

Double-sided closing (wedge action)

Test load, max. (Fmax)

10

kN

Gripping force at 6 bar

18.46

kN

Gripping force at 10 bar

28.75

kN

Pressure, min.

1

bar

Pressure, max.

10

bar

Height

280

mm

Width

185

mm

Depth

185

mm

Opening width, max.

6.5

mm

Gripping of the specimen

At least 20 mm

Weight of jaws (pair)

0.75

kg

Connection

Ø 20

mm

Ambient temperature

0 to +50

°C

Ambient temperature with extension piece

-70 to +250

°C

Weight per specimen grip (without jaws), approx.

13.7

kg

Scope of delivery

2

pieces

  1. The specimen grips can also be used at temperatures from -70 to 250°C in conjunction with an extension piece for temperature chambers (pneumatic actuator is located outside the temperature chamber).

Mounting in a temperature chamber

1. Base unit

2. Mechanical actuation

3. Pneumatic actuation

4. Grip inserts

5. Temperature chamber

6. Extension piece for use in temperature chamber

7. Flexure tools

Pneumatic grips_temperature chamber

Pneumatic grips for temperature chambers

Grips can be used in an ambient temperature range from –70 to +250 °C.

Range of application

  • Specimen material
    Foils/films, plastics, paper, textiles, elastomers, insulating material, wood, glued specimens (only for single-actuator specimen grips)
  • Specimen shape
    Round and flat specimens, only with single-actuator specimen grips
  • Type of loading
    Tensile, compression, alternating load

Advantages and features

  • Innovative quick-change system for jaw inserts.
  • Dove-tail jaw system enables easy, tool-free insert change. Easy side insertion into specimen grip and centering and fixing of jaws occur automatically.
  • Quick and uncomplicated insertion of the specimen: Exact location of the specimen with scale is quickly preset with adjustable centering stop.
  • Uniform test requirements through reproducible gripping force on the specimens
  • Constant gripping force securely holds even specimens that lose thickness during testing.
  • The jaws close flush with the specimen grips. Specimen with small clamping lengths can also be gripped.
  • Precise positioning of the specimen is simplified because of the adjustable stop screws with scale and markings of the jaws (centering stop optionally available).
  • Specimen stops enables the specimen to always be placed centrally in the specimen grip
  • The low overall height of the specimen grips facilitates optimal use of the test area.

Features of the double-actuator specimen grip

  • The symmetrically closing jaws save time required for adjusting to varying specimen thicknesses and ensure that the specimen is gripped exactly in the middle of the test axis.
  • Small load cells, specimen grips, tools and fixtures can be quickly accommodated via the optional mounting unit and without having to dismantle the specimen grips.

Function description

The pneumatic grip is a single- or double-actuator specimen grip that is specifically designed for use in temperature chambers.

The pneumatic grip has a special connector unit for use in temperature chambers with an integrated compressed air supply. A receptacle for condensation water serves as a drainage system to remove condensation from the test area.

The opposing jaw can be adjusted steplessly or set-by-step.

The height of the connector unit depends on the testing system in use, on the temperature chamber, and on the stroke ratios, which depend on the specimen, in the temperature chamber. Therefore they are determined according to the order.

Technical overview of pneumatic grips for temperature chambers

Fmax 200 N, single-actuator

Item no.

318006

Type

8097

Operating principle/identification

For temperature chambers

Test load, max. (Fmax)

0.2

kN

Closing force at 6 bar, max.

0.45

kN

Closing force at 10 bar, max.

0.75

kN

Pressure, min.

0.5

bar

Pressure, max.

10

bar

Height

95

mm

Width

212

mm

Depth

42

mm

Depth with connection unit

58

mm

Adjustability of the opposing jaw

Stepless and step by step

Gripping distance of pneumatically operated side

10.5

mm

Standard opening width, max.[1] With jaws

20

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), approx.

1.28

kg

Connection

Ø 8

mm

Ambient temperature

-70 to +250

°C

Scope of delivery

2

pieces

  1. The standard opening width is the result of using jaws with 5-mm jaw strength.

Fmax 1 kN, single-actuator

Item no.

315120

Type

8287

Operating principle/identification

for the temperature chamber

Test load, max. (Fmax)

1/0.5[1]

kN

Closing force, max. at 6 bar and 6 mm gripping travel, approx.[1]

1.1

kN

Closing force, max. at 6 bar and 11 mm gripping travel, approx.[1]

0.65

kN

Closing force, max. at 10 bar and 6 mm gripping travel, approx.[1]

1.1

kN

Closing force, max. at 10 bar and 11 mm gripping travel, approx.[1]

0.65

kN

Pressure, min.

1

bar

Pressure, max.

10

bar

Height

130

mm

Width

191

mm

Depth

65

mm

Depth with connection unit

104

mm

Gripping travel, max.[1] of the pneumatically operated side at Fmax 1 kN

6

mm

Gripping travel, max.[1]of the pneumatically operated side at Fmax 0.5 kN

11

mm

Standard opening width, max. (with jaws)[2]

10/20

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), approx.

2.5

kg

Connection

Ø 20

mm

Ambient temperature

-70 ... +250

°C

Scope of delivery

2

pieces

  1. The gripping travel can be adjusted from 0 ... 6 mm to 0 ... 11 mm. Thus, the closing force is reduced by 50% to 0.5 kN.
  1. The standard opening width is the result of using jaws with 5-mm jaw strength.

Fmax 1 kN, double-actuator

Item no.

313950

Type

8287

Operating principle/identification

For temperature chambers

Test load, max. (Fmax)

1 to 0.5[1]

kN

test load, max with 12-mm clamping distance

1

kN

Test load, max with 22 mm clamping distance[2]

0.5

kN

Gripping force, max. at 6 bar and 6 mm opening width, approx.[3]

1.1

kN

Closing force, max. at 6 bar and 22 mm gripping travel, approx.[3]

0.65

kN

Closing force, max. at 10 bar and 12 mm gripping travel, approx.[3]

1.1

kN

Closing force, max. at 10 bar and 22 mm gripping travel, approx.[3]

0.65

kN

Pressure, min.

1

bar

Pressure, max.

10

bar

Height

130

mm

Width

240

mm

Depth

65

mm

Depth with connection unit

128

mm

Gripping travel, max.[3] Of the pneumatically operated side at Fmax 1 kN

12

mm

Gripping travel, max.[3]Of the pneumatically operated side at Fmax 0.5 kN

22

mm

Standard opening width, max. (with jaws)[4]

12 to 22

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), approx.

2.8

kg

Connection

Ø 20

mm

Ambient temperature

-70 to +250

°C

Scope of delivery

2

pieces

  1. Clamping distance is adjustable from 0–12 mm to 0–22 mm. Thus, the closing force is reduced to 50%.
  1. The gripping travel can be adjusted from 0 .to 6 mm to 0 to 11 mm. Thus, the closing force is reduced by 50% to 0.5 kN.
  1. The gripping travel can be adjusted from 0 to 6 mm to 0 to 11 mm. Thus, the closing force is reduced by 50% to 0.5 kN.
  1. The standard opening width is the result of using jaws with 5-mm jaw strength.

Fmax 2.5 kN, single-actuator

Item no.

317911

Type

8297

Test load, max. (Fmax)

2.5

kN

Closing force, max. at 6 bar

3.6

kN

Closing force, max. at 10 bar

6

kN

Pressure, min.

1

bar

Pressure, max.

10

bar

Height

125

mm

Width

205

mm

Depth

110

mm

Max. gripping distance of pneumatically operated side

10.5

mm

Standard opening width, max. (with jaws)[1]

16

mm

Adjustability of the opposing jaw

Stepless and step by step

Gripping of the specimen

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

Weight per specimen grip (without jaws), approx.

2.5

kg

Connection

Ø 20

mm

Ambient temperature

-70 to +250

°C

Scope of delivery

2

pieces

  1. The standard opening width is the result of using jaws with 5-mm jaw strength.

Fmax 10 kN and 20 kN, double-actuator

Item no.

320005

320254

Type

8397

8497

Operating principle/identification

For temperature chambers

For temperature chambers

Test load, max. (Fmax)

10

20

kN

Closing force, max. at 6 bar

25

35

kN

Pressure, min.

1.5

1.5

bar

Pressure, max.

6

6

bar

Height

213

213

mm

Width

242

242

mm

Depth

112

112

mm

Gripping travel, max.

10

10

mm

Standard opening width, max. (with jaws)[1]

25

25

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.

Weight per specimen grip (without jaws), approx.

14

14

kg

Connection

Ø 20

Ø 36

mm

Ambient temperature

-70 to +250

-70 to +250

°C

Scope of delivery

2

2

pieces

  1. The standard opening width is the result of using jaws with 5-mm jaw strength.

Pneumatic Control Unit

Pneumatic control unit
The gripping force of the pneumatic specimen grips can be steplessly set via a pneumatic control unit, which ensures the safe gripping of a wide range of different materials. The opening and closing of the specimen grips can be controlled by foot switches or the remote control of the materials testing machine for greater operating comfort. 
Top