Pneumatic Grips

Pneumatic specimen grips are 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.
Pneumatic grips

Significant Advantages and Features of Pneumatic Grips

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 ZwickRoell 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

  • Constant pneumatic pressure allows even specimens prone to shrinkage to be held securely.
  • Constant gripping force enables repeatable test results to be achieved.
  • High specimen throughput thanks to quick specimen insertion and exact centering with insertion aid and guide groove.
  • Grips operated via toggle lever for fast, easy specimen changes.
  • Adjustable opposing jaw for fast, easy testing, including joined (asymmetrical) specimens
  • Ergonomic, open design for fast, easy specimen insertion and clamping
  • 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

The pneumatic grips are single actuator specimen grips. The grips are opened and closed pneumatically and also the gripping force before the test is applied pneumatically via a toggle switch valve on the specimen grips.

It is not possible to change the compression force at the specimen grip.

No additional pneumatic control unit is required, however one can be used alternatively.

Fmax 20 N and 50 N

Item No.

318637

318639

Type

8195

8195

Operating principle/feature

with integrated control valve

with integrated control valve

Test load Fmax

0.02

0.05

kN

Gripping force, max. at 6 bar

50

100

N

Gripping force, max. at 10 bar

140

200

N

Pressure, min.

4

4

bar

Pressure, max.

10

10

bar

Dimensions

Height

90

90

mm

Width

77

77

mm

Width with handwheel/pneumatic unit

107.5

112

mm

Depth

60

60

mm

Depth with toggle lever

108

108

mm

Clamping travel of pneumatically operated side

6

6

mm

Opening width, max.[1]

16

16

mm

Specimen gripping

The specimen must be gripped over the entire jaw height.

Weight per grip unit, approx.

380

405

g

Connection, stud

Ø 8

Ø 8

mm

Ambient temperature

+10 to +35

+10 to +35

°C

Scope of delivery

2

2

pieces

Insertion aid

included

included

Pneumatic connection

DN7 quick-action coupling

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 opening width arises when using grip inserts with 5mm jaw thickness.

Fmax 100 N and 200 N

Item No.

353095

353096

Type

8195

8195

Operating principle/feature

with integrated control valve

Test load Fmax

0.1

0.2

kN

Gripping force, max. at 6 bar

200

400

N

Gripping force, max. at 10 bar

360

700

N

Pressure, min.

3

3

bar

Pressure, max.

10

10

bar

Dimensions

Height

95

95

mm

Width

100

100

mm

Width with handwheel/pneumatic unit

141.5

mm

Depth

60

60

mm

Depth with toggle lever

109

mm

Width with hand wheel/pneumatic unit

141.5

Depth with toggle switch

109

Clamping travel of pneumatically operated side

4

mm

Opening width, max.[1]

11

mm

Specimen gripping

The specimen must be gripped over the entire jaw height.

Connection, stud

Ø 8

mm

Ambient temperature

+10 to +35

+10 to +35

°C

Weight per grip unit, approx.

530

g

Scope of delivery

2

2

pieces

Insertion aid

-

Pneumatic connection

DN7 quick-action coupling

DN7 quick action coupling

Jaws supplied

Surface

no jaws included

No jaws supplied

Gripping area (H x W)

-

Hardness

-

-

Jaw size (H x W)

-

Operating principle/identification

With an integrated control valve

Clamping stroke of pneumatically operated side

4

Standard opening width, max.[2] (With grip inserts)

6

Specimen clamping

The specimen must be gripped over the entire jaw height.

Weight per specimen grip, approx.

520

Connection, bolts

Ø 8

Insertion device

-

  1. The opening width arises when using grip inserts with 5mm jaw thickness.
  1. The standard opening width is the result of using grip inserts with 5-mm jaw strength.

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

Fmax 1 kN

Range of application

  • Specimen material:
    metals, plastics, textiles, paper, non-wovens, elastomers
  • Specimen shape:
    round and flat specimens, films/foils, asymmetrical specimens
  • Type of loading.
    tensile, compression, alternating load

Advantages and Features

  • Constant pneumatic pressure allows even specimens prone to shrinkage to be held securely.
  • Constant gripping force enables repeatable test results to be achieved.
  • The jaws can be changed quickly and easily for different applications - no tools required. The jaws are centered automatically.
  • Precise test results combined with high number of cycles achieved through centric insertion of specimen using easily adjustable centering stop.
  • Grips operated via toggle lever for fast, easy specimen changes.
  • Adjustable opposing jaw for fast, easy testing, including joined (asymmetrical) specimens
  • Ergonomic, open design for fast, easy specimen insertion and clamping

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

Test load Fmax

1

1

kN

Gripping force, max. at 6 bar

1

1

kN

Gripping force, max. at 10 bar

1.7

1.7

kN

Pressure, min.

3

3

bar

Pressure, max.

10

10

bar

Dimensions

Height

108

108

mm

Width

148

148

mm

Width with hand wheel/pneumatic unit

210

210

mm

Depth

60

60

mm

Clamping stroke of pneumatically operated side

4

mm

Standard opening width, max.[1]

6

6

mm

Specimen clamping

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

Weight per specimen grip, approx.

1.3

1.46

kg

Connection, bolts

Ø 8

Ø 20

mm

Ambient temperature

+10 to +35

+10 to +35

°C

Scope of delivery

2

2

pieces

Pneumatic connection

DN7 quick action coupling

Gripping stroke of pneumatically operated side

4

Specimen gripping

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

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

Pneumatic specimen grips, single-actuator

Fmax 200 N, 500 N, 1 kN, 2.5 kN

Range of application

  • Specimen material:
    metals, plastics, textiles, paper
  • Specimen shape:
    round and flat specimens, 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

  • Constant pneumatic pressure allows even specimens prone to shrinkage to be held securely.
  • Constant gripping force enables repeatable test results to be achieved.
  • The jaws can be changed quickly and easily for different applications - no tools required. The jaws are centered automatically.
  • Precise test results combined with high number of cycles achieved through centric insertion of specimen using easily adjustable centering stop.
  • Adjustable opposing jaw for fast, easy testing, including joined (asymmetrical) specimens
  • Ergonomic, open design for fast, easy specimen insertion and clamping

Function description

The gripping pressure of the specimen grip can be set steplessly and reproducibly via a pneumatic control unit. The specimen is held securely and jaw breaks are prevented during the test.

The opening and closing of the specimen grips can be controlled by foot switches or the remote control of the materials testing machine, providing great operating comfort.

  • The opposing jaw varies according to type:
  • stepped adjustment: fixed mounting, can be adjusted in 1mm steps (tool required)
  • stepped and stepless adjustment: adjustment via screw drive, additionally adjustable in 1mm steps by means of a tool.

Fmax 200 N

Item No.

316690

316692

Type

8097

8097

Operating principle/identification

Opposing jaw can be adjusted step by step

Test load Fmax

0.2

0.2

kN

Closing force, max. at 6 bar

340

N

Closing force, max. at 10 bar

570

N

Pressure, min.

0.5

0.5

bar

Pressure, max.

10

10

bar

Dimensions

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

mm

Standard opening width, max.[1]

20

mm

Gripping of the specimen

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

Weight per specimen grip, approx.

1.07

kg

Connection, bolts

Ø 8

mm

Ambient temperature

+10 to +35

+10 to +35

°C

Scope of delivery

2

2

pieces

Operating principle/feature

opposing jaw with stepless and stepped adjustment

Gripping force, max. at 6 bar

340

Gripping force, max. at 10 bar

570

Clamping travel of pneumatically operated side

10.5

Opening width, max.[2]

20

Specimen gripping

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

Weight per grip unit, approx.

1.16

Connection, stud

Ø 8

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

Fmax 500 N

Type

8097

Item No.

1063630

Operating principle/feature

Opposing jaw adjustable steplessly and in steps

Test load Fmax

0.5

kN

Gripping force, max. at 6 bar

0.725

kN

Gripping force, max. at 10 bar

1.313

kN

Pressure, min.

1

bar

Pressure, max.

10

bar

Dimensions

Height

95

mm

Installation height

120

mm

Width

242

mm

Depth

60

mm

Depth with connection unit

104

mm

Clamping travel of pneumatically operated side

10.5

mm

Opening width, max.[1]

20

mm

Specimen gripping

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

Weight per grip unit, approx.

1.5

kg

Connection, stud

Ø 20

mm

Ambient temperature

+10 to +35

°C

Scope of delivery

1

piece

  1. The opening width occurs when using jaws with 5mm jaw thickness.

Fmax 1 kN

Item No.

014772

014774

Type

8197

8197

Operating principle/identification

Opposing jaw can be adjusted step by step

Test load Fmax

1

1

kN

Closing force at 6 bar, max.

1.7

kN

Closing force at 10 bar, max.

2.8

kN

Pressure, min.

0.5

0.5

bar

Pressure, max.

10

10

bar

Dimensions

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

mm

Standard opening width, max.[1]

20

mm

Gripping of the specimen

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

Weight per specimen grip, approx.

1.68

kg

Connection, bolts

Ø 20

mm

Ambient temperature

+10 to +35

+10 to +35

°C

Scope of delivery

2

2

pieces

Operating principle/feature

opposing jaw with stepless and stepped adjustment

Gripping force, max. at 6 bar

1.7

Gripping force, max. at 10 bar

2.8

Clamping travel of pneumatically operated side

10.5

Opening width, max.[2]

20

Specimen gripping

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

Weight per grip unit, approx.

1.76

Connection, stud

Ø 20

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

Fmax 2.5 kN

Item No.

316449[1]

316451[2]

Type

8197

8197

Operating principle/identification

Opposing jaw can be adjusted step by step

Test load Fmax

2.5

2.5

kN

Closing force at 6 bar, max.

3.6

kN

Closing force at 10 bar, max.

6

kN

Pressure, min.

0.5

0.5

bar

Pressure, max.

10

10

bar

Dimensions

Height

95

95

mm

Mounting height

135

mm

Width

238

242

mm

Depth

110

110

mm

Depth with connection unit

151

151

mm

Installation height

135

Gripping distance of pneumatically operated side

10.5

mm

Standard opening width, max.[3]

20

mm

Gripping of the specimen

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

Weight per specimen grip, approx.

2.4

kg

Connection, bolts

Ø 20

mm

Ambient temperature

+10 to +35

+10 to +35

°C

Scope of delivery

2

2

pieces

Operating principle/feature

opposing jaw with stepless and stepped adjustment

Gripping force, max. at 6 bar

3.6

Gripping force, max. at 10 bar

6

Clamping travel of pneumatically operated side

10.5

Opening width, max.[4]

20

Specimen gripping

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

Weight per grip unit, approx.

2.5

Connection, stud

Ø 20

  1. When working with optical extensometers, you must ensure that the area to be measured is not covered by the pneumatic actuator.
  1. If used in conjunction with optical extensometers: care must be taken that the area to be measured is not obscured by the pneumatic actuator.
  1. The standard opening width is the result of using jaws with 5 mm jaw strength.
  1. The opening width arises when using jaws with 5mm jaw thickness.

Pneumatic specimen grips, single-actuator

Fmax 5 kN, 10 kN, and 30 kN

Range of application

  • Specimen material:
    metals, plastics, textiles, paper, elastomers, wood, insulating materials
  • Specimen shape:
    round and flat specimens, asymmetrical specimens
  • Type of loading:
    tensile, compression, alternating load
Pneumatic specimen grip Fmax 5 kN is also ideal for insulating material.

Advantages and features

  • Constant pneumatic pressure allows even specimens prone to shrinkage to be held securely.
  • Constant gripping force enables repeatable test results to be achieved.
  • The jaws can be changed quickly and easily for different applications - no tools required. The jaws are centered automatically.
  • Precise test results combined with high number of cycles achieved through centric insertion of specimen using easily adjustable centering stop.
  • Adjustable opposing jaw for fast, easy testing, including joined (asymmetrical) specimens
  • Ergonomic, open design for fast, easy specimen insertion and clamping
  • Extremely high gripping force guarantees secure specimen clamping.
  • Save time by attaching small specimen grips and test fixtures to large specimen grips quickly and easily via T-slot systems. The precise alignment ensures reliable test results.

Function description

The gripping pressure of the specimen grip can be set steplessly and reproducibly via a pneumatic control unit. The specimen is held securely and jaw breaks are prevented during the test.

The opening and closing of the specimen grips can be controlled by foot switches or the remote control of the materials testing machine, providing great operating comfort.

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 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

Dimensions

Height

163.5

mm

Width

266

mm

Depth

84

mm

Depth with connection unit

164

mm

Gripping travel of pneumatically operated side

12.5

mm

Standard opening width, max.[2]

24

mm

Gripping of the specimen

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

Weight per specimen grip, approx.

8.2

kg

Connection, bolts

Ø 20

mm

Ambient temperature

+10 to +35

°C

Scope of delivery

2

pieces

  1. First recommended and approved for strain rate control in accordance to 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 10 kN

Item No.

317654[1]

Type

8397

Test load Fmax

10

kN

Gripping force, max. at 6 bar

18

kN

Gripping force, max. at 10 bar

30

kN

Pressure, min.

0.5

bar

Pressure, max.

10

bar

Dimensions

Height

164

mm

Width

377

mm

Depth

84

mm

Depth with connection unit

137

mm

Clamping travel of pneumatically operated side

12.5

mm

Opening width, max.[2]

24

mm

Specimen gripping

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

Weight per grip unit, approx.

10

kg

Connection, stud

Ø 20

mm

Ambient temperature

+10 to +35

°C

Scope of delivery

2

pieces

  1. First recommended and approved for strain rate control in accordance to DIN EN ISO 6892-1:2009 and ASTM E8 – 09
  1. The opening width is the result of using jaws with 5 mm jaw strength.

Fmax 30 kN

Item No.

317588[1]

Type

8497

Test load 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

Dimensions

Height

176.5

mm

Width

368

mm

Depth

112

mm

Depth with connection unit

143

mm

Gripping travel of pneumatically operated side

12.5

mm

Standard opening width, max.[2]

24

mm

Gripping of the specimen

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

Weight per specimen grip, approx.

15

kg

Connection, bolts

Ø 36

mm

Ambient temperature

+10 to +35

°C

Scope of delivery

2

pieces

  1. First recommended and approved for strain rate control in accordance to 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 ZwickRoell,
Pneumatic grips

Specimen grips with control valve can be mounted in different ways

Fmax 20 N

Advantages and features

  • 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.
  • The jaws can be changed quickly and easily for different applications - no tools required. The jaws are centered automatically.
  • Constant gripping force enables repeatable test results to be achieved.
  • Constant pneumatic pressure allows even specimens prone to shrinkage to be held securely.
  • Grips operated via toggle lever for fast, easy specimen changes.
  • Ergonomic, open design for fast, easy specimen insertion and clamping

Function description

The jaws are secured with a threaded locking-pin. and can be changed without the use of tools.

An additional pneumatic control unit is not required. Soft opening and closing of the jaws takes place via a toggle valve. This offers advantages in terms of zero-force control.

The pneumatic gripping pressure on the grips cannot be changed. This is only possible by means of an additional pressure control valve.

Technical data, Fmax 20 N

Item No.

080489

Type

8095

Test load Fmax

0.02

kN

Closing force at 6 bar, approx.

115

N

Closing force at 8 bar, approx.

150

N

Pressure, max.

8

bar

Dimensions

Height

102

mm

Width

57

mm

Depth

60

mm

Opening width, max.

5

mm

Specimen gripping

The specimen must be gripped over the entire jaw height.

Weight per grip unit, approx.

118

g

Connection, stud

Ø 8

mm

Ambient temperature

+10 to +35

°C

Pneumatic connection (provided by customer)

DN7 quick-action coupling

Scope of delivery

2[1]

pieces

  1. Included in delivery: 2 toggle valves with flexible mounting position, with throttle non-return valve
Pneumatic grips

Pneumatic specimen grips, double-actuator

Fmax 200 N and 1 kN

Advantages and features

  • 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.
  • The jaws can be changed quickly and easily for different applications - no tools required. The jaws are centered automatically.
  • Constant gripping force enables repeatable test results to be achieved.
  • Constant pneumatic pressure allows even specimens prone to shrinkage to be held securely.
  • Ergonomic, open design for fast, easy specimen insertion and clamping

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

Type

8187

8287

Item No.

313852

313874

Operating principle/feature

opening width adjustable via lever

opening width adjustable via lever

Test load Fmax

0.2/0.1[1]

1/0.5[1]

kN

Max. gripping force at 6 bar

0.2/0.1

1/0.5

kN

Max. gripping force at 10 bar

0.33/0.16

1.6/0.8

kN

Pressure, min.

1.5

1

bar

Pressure, max.

10

10

bar

Dimensions

Height

95

131

mm

Width

202

240

mm

Depth

42

65

mm

Depth with connection unit

133

156

mm

Clamping stroke of pneumatically operated side

12/22

12/22

mm

Opening width, max.[2]

12/22

12/22

mm

Specimen gripping

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

Connection, stud

Ø 8

Ø 14

mm

Ambient temperature

+10 to +35

+10 to +35

°C

Weight per grip unit, approx.

1

2.8

kg

Scope of delivery

2

2

pieces

  1. The clamping stroke can be changed from 0 - 12 mm to 0 - 22 mm. This reduces the gripping force by 50% to 100 N and 500 N respectively.
  1. The opening width arises when using jaws with 5mm jaw thickness.
Pneumatic grips

Pneumatic specimen grips, double-actuator

Fmax 2.5 kN

Advantages and features

  • 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.
  • The jaws can be changed quickly and easily for different applications - no tools required. The jaws are centered automatically.
  • Precise test results combined with high number of cycles achieved through centric insertion of specimen using easily adjustable centering stop.
  • Constant gripping force enables repeatable test results to be achieved.
  • Constant pneumatic pressure allows even specimens prone to shrinkage to be held securely.
  • Ergonomic, open design for fast, easy specimen insertion and clamping
  • The projecting jaws enable a clear view and access for optical and mechanical extensometers, even with short gauge lengths.

Function description

Die Schließkraft wird über einen zentral angeordneten Pneumatikzylinder eingeleitet. Dieser überträgt die Schließbewegung über Umlenkhebel auf die symmetrisch schließenden Backen.

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 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

Dimensions

Height

170

mm

Height with centering stop

182

mm

Width

210

mm

Depth

82

mm

Opening width, max.[1]

20

mm

Specimen gripping

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

Weight per grip unit, approx.

4.7

kg

Connection, stud

Ø 20

mm

Ambient temperature

+10 to +35

°C

Scope of delivery

2

pieces

  1. The opening width arises when using jaws with 5mm jaw thickness.
Pneumatic grips_multiXtens

Pneumatic specimen grips, double-actuator

Fmax 10 kN, 20 kN

Advantages and features

  • 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.
  • The jaws can be changed easily for different applications.
  • Precise test results combined with high number of cycles achieved through centric insertion of specimen using easily adjustable centering stop.
  • Constant gripping force enables repeatable test results to be achieved.
  • Constant pneumatic pressure allows even specimens prone to shrinkage to be held securely.
  • Save time by attaching small specimen grips and test fixtures to large specimen grips quickly and easily via T-slot systems. The precise alignment ensures reliable test results.

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[1]

Type

8397

8497

Test load Fmax

10

20

kN

Max. gripping force at 6 bar

27

27

kN

Max. gripping force at 10 bar

45

45

kN

Pressure, min.

2.5

2.5

bar

Pressure, max.

10

10

bar

Dimensions

Height

208

225

mm

Height with connection unit

230

247

mm

Width

242

242

mm

Depth

112

112

mm

Depth with connection unit/overhang

N/A

132

Clamping stroke[2]

10

10

mm

Opening width, max.[3]

26

26

mm

Specimen gripping

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

Weight per grip unit, approx.

14

14

kg

Connection, stud

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 EN ISO 6892-1:2009 and ASTM E8 – 09.
  1. see diagram showing the relationship between clamping stroke and specimen thickness/opening width
  1. The opening width arises when using jaws with 5mm jaw thickness.
Pneumatic grips

Specimen grip with high gripping force

Fmax 20 kN

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 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

Dimensions

Height

225

mm

Height with connection unit

247

mm

Width

242

mm

Depth

112

mm

Depth with connection unit/projection

132

mm

Clamping travel

8

mm

Opening width, max.[2]

20

mm

Specimen gripping

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

Connection, stud

Ø 36

mm

Ambient temperature

+10 to +35

°C

Weight per grip unit, approx.

14

kg

Scope of delivery

2

pieces

  1. Recommended and approved for strain rate control in accordance with EN ISO 6892-1:2009 and ASTM E8 – 09.
  1. The opening width arises when using jaws with 5mm jaw thickness.
Pneumatic grips

Pneumatic specimen grips, double-actuator

Fmax 50 kN, 100 kN

Advantages and Features

  • 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.
  • The jaws can be changed easily for different applications.
  • Precise test results combined with high number of cycles achieved through centric insertion of specimen using easily adjustable centering stop.
  • Constant gripping force enables repeatable test results to be achieved.
  • Constant pneumatic pressure allows even specimens prone to shrinkage to be held securely.
  • Save time by attaching small specimen grips and test fixtures to large specimen grips quickly and easily via T-slot systems. The precise alignment ensures reliable test results.

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

Prüfkraft 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

Dimensions

Height

306

341

mm

Width

390

390

mm

Depth

156

156

mm

Tiefe mit Überhang

186

190

mm

Gripping travel[2]

21

15

mm

Opening width/specimen thickness

siehe Tabelle Backen

siehe Tabelle Backen

Gripping of the specimen

Die Probe muss über mindestens 1/2 der Backenhöhe geklemmt sein.

Weight per specimen grip, approx.

53

53

kg

Anschluss, Bolzen

Ø 36

Ø 60

mm

Ambient temperature

+10 to +35

+10 to +35

°C

Scope of delivery

2

2

Stück

  1. Recommended and approved for strain rate control in accordance with standards DIN EN ISO 6892-1:2009 and ASTM E8 – 09.
  1. siehe Diagramm, in dem der Zusammenhang zwischen Klemmweg und Probendicke/Öffnungsweite dargestellt ist

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

Type

8304

Item No.

1004956[1]

Test load Fmax

10

kN

Operating principle/identification

Double-sided closing (wedge action)

Gripping force at 6 bar

18.46

kN

Gripping force at 10 bar

28.75

kN

Pressure, min.

1

bar

Pressure, max.

10

bar

Dimensions

Height

280

mm

Width

185

mm

Depth

185

mm

Opening width, max.

6.5

mm

Gripping length

min. 20

mm

Weight

per specimen grips, approx.

13.7

kg

Jaws (pair)

0.75

kg

Optional stopper system

0.5

kg

Connection, bolts

Ø 20

mm

Ambient temperature

0 to +50

°C

Ambient temperature with extension piece

-70 to +250

°C

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:
    plastics, paper, textiles, elastomers, wood, insulating materials
  • Specimen shape:
    round and flat specimens, asymmetrical specimens
  • 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

These pneumatic grips are single or double-actuator grips specifically designed for use in temperature chambers.

The single-actuator grips can be used for both symmetrical and asymmetrical clamping. The opposing jaw features stepless adjustment.

Double-actuator specimen grips always close symmetrically to the tensile axis, eliminating the need for thickness adjustment.

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

Test load Fmax

1/0.5[1]

kN

Max. closing force at 6 bar & 6mm clamping travel, approx.[1]

1.1

kN

Max. closing force at 6 bar & 11 mm clamping travel, approx.[1]

0.65

kN

Max. closing force at 10 bar & 6 mm clamping travel, approx.[1]

1.1

kN

Max. closing force at 10 bar & 11 mm clamping travel, approx.[1]

0.65

kN

Pressure, min.

1

bar

Pressure, max.

10

bar

Dimensions

Height

130

mm

Installation height

180

mm

Width

191

mm

Depth

65

mm

Depth with connection unit

104

mm

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

6

mm

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

11

mm

Opening width, max.[2]

10/20

mm

Specimen gripping

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

Weight per grip unit, approx.

2.5

kg

Connection, stud

Ø 20

mm

Ambient temperature

-70 to +250

°C

Scope of delivery

2

pieces

  1. The clamping travel can be changed from 0 to 6 mm to 0 to 11 mm. This reduces the closing force by 50% to 0.5 kN.
  1. The opening width arises when using jaws with 5mm jaw thickness.

Fmax 1 kN, double-actuator

Item No.

313950

Type

8287

Test load Fmax

1/0.5

kN

Max. closing force at 6 bar

at opening width 12 mm, approx.

1

kN

at opening width 22 mm, approx.

0.5

kN

Max. closing force at 10 bar & 12 mm clamping travel, approx.[1]

1.1

kN

Max. closing force at 10 bar & 22 mm clamping travel, approx.[1]

0.65

kN

Opening width, max.[2]

12/22

mm

Specimen gripping

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

Clamping range (distance between the jaws)

at Fmax 1 kN

0 to 10

mm

at Fmax 0.5 kN

0 to 20

mm

Pressure, min.

1

bar

Pressure, max.

10

bar

Dimensions

Height

181

mm

Width

240

mm

Depth

109

mm

Depth with pneumatic hoses

128

mm

Weight per grip unit, approx.

2.8

kg

Connection, stud

Ø 20 mm

Ambient temperature

-70 to +250

°C

Scope of delivery

2

pieces

  1. The clamping travel is adjustable from 0 – 12 mm to 0 – 22 mm. This reduces the closing force by 50 %.
  1. The opening width arises when using jaws with 5mm jaw thickness.

Fmax 2.5 kN, single-actuator

Item No.

317911

Type

8297

Operating principle/identification

For temperature chamber

Adjustability of the opposing jaw

Stepless and step-by-step

Test load Fmax

2.5

kN

Closing force at 6 bar, max.

3.6

kN

Closing force at 10 bar, max.

6

kN

Pressure, min.

1

bar

Pressure, max.

10

bar

Dimensions

Height

125

mm

Width

205

mm

Depth

110

mm

Depth with connection unit

110

mm

Gripping travel of pneumatically operated side

10.5

mm

Standard opening width, max.[1]

16

mm

Gripping of the specimen

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

Weight per specimen grip, approx.

2.5

kg

Connection, bolts

Ø 20

mm

Ambient temperature

-70 to +250

°C

Scope of delivery

2

pieces

  1. The standard opening width is the result of using grip inserts 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 for Specimen Grips

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. 
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