Pneumatic Specimen Grips - single actuator

Pneumatic specimen grips are recommended for strain rate control in accordance with standards DIN EN ISO 6892-1:2009 and ASTM E8–09

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 onecan be used alternatively. The opposing jaw features stepless adjustment.

2.5kN 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/identification

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

Operating pressure

4 ... 10

4 ... 10

bar

Dimensions

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

Supplied jaws

Gripping area

Height

30

mm

Width

60

mm

Surface

Vulkollan, smooth

Hardness

95 Shore A

Jaws supplied

Gripping area

Height

30

Width

60

Surface

Vulkollan, smooth

Hardness

95 Shore A

Gripping travel of pneumatically operated side

6

6

mm

Opening width, max. with jaws

11

11

mm

Gripping of the specimen

The specimen must be gripped with the entire height of the jaw.

Weight per specimen grip, approx.

380

405

g

Connection, stud

Ø 8

Ø 8

mm

Ambient temperature

+10 ... +35

+10 ... +35

°C

Scope of delivery

2

2

pieces

Insertion aid

Included

Included

Pneumatic connection

DN7 quick action coupling

Fmax 100 N and 200 N

Type

8195

8195

Item No.

353095

353096

Operating principle/identification

With integrated control valve

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

Operating pressure

3 ... 10

3 ... 10

bar

Dimensions

Height

95

95

mm

Width

100

100

mm

Depth

60

60

mm

Opening width, max. with jaws, thickness 5 mm

6

6

mm

Gripping of the specimen

The specimen must be gripped with the entire height of the jaw.

Weight per specimen grip, approx.

530

520

g

Connection, stud

Ø 8

Ø 8

mm

Ambient temperature

+10 ... +35

+10 ... +35

°C

Scope of delivery

2

2

pieces

Insertion aid

-

-

Pneumatic connection

DN7 quick action coupling

Supplied jaws

Surface

No jaws supplied

No jaws supplied

Gripping area

Height

-

-

mm

Width

-

-

mm

Hardness

-

-

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

Function description

  • 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

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.

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

Operating pressure

3 ... 10

3 ... 10

bar

Dimensions

Height

108

108

mm

Width

148

148

mm

Width with hand wheel/pneumatic unit

210

210

mm

Depth

68

68

mm

Gripping travel of pneumatically operated side

4

4

mm

Opening width, max. with jaws, thickness 5 mm[1]

6

6

mm

Gripping of the specimen

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

Weight per specimen grip, approx.

1.3

1.46

kg

Connection, stud

Ø 8

Ø 20

mm

Ambient temperature

+10 ... +35

+10 ... +35

°C

Scope of delivery

2

2

pieces

Pneumatic connection

DN7 quick action coupling

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

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

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

Opposing jaw adjustable steplessly and in steps

Test load Fmax

0.2

0.2

kN

Closing force, max. at 6 bar

340

340

N

Closing force, max. at 10 bar

570

570

N

Operating pressure

0.5 ... 10

0.5 ... 10

bar

Dimensions

Height

95

95

mm

Width

202

207

mm

Depth

32

32

mm

Depth with connection unit

74

74

mm

Gripping travel of pneumatically operated side

10.5

10.5

mm

Opening width, max. with jaws, thickness 5 mm

20

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

1.16

kg

Connection, stud

Ø 8

Ø 8

mm

Ambient temperature

+10 ... +35

+10 ... +35

°C

Scope of delivery

2

2

pieces

Fmax 500 N

Type

8097

Item No.

1063630

Operating principle/identification

Opposing jaw adjustable steplessly and in steps

Test load Fmax

0.5

kN

Gripping force at 3 bar, max.

0.330

kN

Gripping force at 10 bar, max.

1.313

kN

Operating pressure

1 ... 10

bar

Dimensions

Height

95

mm

Installation height

120

mm

Width

242

mm

Depth

60

mm

Depth with connection unit

104

mm

Gripping travel of pneumatically operated side

10.5

mm

Opening width, max. with jaws[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.

1.5

kg

Connection, stud

Ø 20

mm

Ambient temperature

+10 ... +35

°C

Scope of delivery

1

pieces

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

Fmax 1 kN

Item No.

014772

014774

Type

8197

8197

Operating principle/identification

Opposing jaw can be adjusted step by step

Opposing jaw adjustable steplessly and in steps

Test load Fmax

1

1

kN

Gripping force at 6 bar, max.

1.7

1.7

kN

Gripping force at 10 bar, max.

2.8

2.8

kN

Operating pressure

0.5 ... 10

0.5 ... 10

bar

Dimensions

Height

95

95

mm

Installation height

120

120

mm

Width

238

242

mm

Depth

80

80

mm

Depth with connection unit

121

121

mm

Gripping travel of pneumatically operated side

10.5

10.5

mm

Opening width, max. with jaws, thickness 5 mm

20[1]

20[1]

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

1.76

kg

Connection, stud

Ø 20

Ø 20

mm

Ambient temperature

+10 ... +35

+10 ... +35

°C

Scope of delivery

2

2

pieces

  1. This opening width is the result of the use of jaw inserts with 5 mm thickness.

Fmax 2.5 kN

Item No.

316449[1]

316451[1]

Type

8297

8297

Operating principle/identification

Opposing jaw can be adjusted step by step

Opposing jaw adjustable steplessly and in steps

Test load Fmax

2.5

2.5

kN

Gripping force at 6 bar, max.

3.6

3.6

kN

Gripping force at 10 bar, max.

6

6

kN

Operating pressure

0.5 ... 10

0.5 ... 10

bar

Dimensions

Height

95

95

mm

Installation height

135

135

mm

Width

238

242

mm

Depth

110

110

mm

Depth with connection unit

151

151

mm

Gripping travel of pneumatically operated side

10.5

10.5

mm

Opening width, max. with jaws, thickness 5 mm

20[2]

20[2]

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

2.5

kg

Connection, stud

Ø 20

Ø 20

mm

Ambient temperature

+10 ... +35

+10 ... +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. This standard opening width is the result of the use of jaw inserts with 5 mm 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

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

Gripping force at 6 bar, max.

9

kN

Gripping force at 10 bar, max.

16

kN

Operating pressure

1 ... 10

bar

Dimensions

Height

162

mm

Width

266

mm

Depth

84

mm

Depth with connection unit

164

mm

Gripping travel of pneumatically operated side

12.5

mm

Opening width, max. with jaws, thickness 5 mm

24[2]

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, stud

Ø 20

mm

Ambient temperature

+10 ... +35

°C

Scope of delivery

2

pieces

  1. Recommended and approved for strain rate control to the standards DIN EN ISO 6892-1:2009 and ASTM E8-09
  1. This opening width is the result of the use of the alternative jaw mountings and jaw inserts with 5 mm thickness

Fmax 10 kN

Item No.

317654[1]

Type

8397

Test load Fmax

10

kN

Gripping force at 6 bar, max.

18

kN

Gripping force at 10 bar, max.

30

kN

Operating pressure

0.5 ... 10

bar

Dimensions

Height

164

mm

Width

368

mm

Depth

84

mm

Depth with connection unit

129

mm

Gripping travel of pneumatically operated side

12.5

mm

Opening width, max. with jaws, thickness 5 mm

24[2]

mm

Gripping of the specimen

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

Weight per specimen grip, approx.

10

kg

Connection, stud

Ø 20

mm

Ambient temperature

+10 ... +35

°C

Scope of delivery

2

pieces

  1. Recommended and approved for strain rate control to the standards DIN EN ISO 6892-1:2009 and ASTM E8-09
  1. This opening width is the result of the use of the alternative jaw mountings and jaw inserts with 5 mm thickness

Fmax 30 kN

Item No.

317588[1]

Type

8497

Test load Fmax

30

kN

Gripping force at 6 bar, max.

35

kN

Gripping force at 10 bar, max.

58

kN

Operating pressure

0.5 ... 10

bar

Dimensions

Height

177

mm

Width

368

mm

Depth

112

mm

Depth with connection unit

153

mm

Gripping travel of pneumatically operated side

12.5

mm

Opening width, max. with jaws, thickness 5 mm

24[2]

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, stud

Ø 36

mm

Ambient temperature

+10 ... +35

°C

Scope of delivery

2

pieces

  1. Recommended and approved for strain rate control to the standards DIN EN ISO 6892-1:2009 and ASTM E8-09
  1. This opening width is the result of the use of the alternative jaw mountings and jaw inserts with 5 mm thickness

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

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 chamber

Adjustability of the opposing jaw

Stepless and in steps

Test load Fmax

0.2

kN

Gripping force at 6 bar, max.

0.45

kN

Gripping force at 10 bar, max.

0.75

kN

Operating pressure

1.5 ... 10

bar

Dimensions

Height

95

mm

Width

212

mm

Depth

42

mm

Depth with connection unit

58

mm

Gripping travel of pneumatically operated side

10.5

mm

Opening width, max. with jaws, thickness 5 mm

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.

1.28

kg

Connection, stud

Ø 8

mm

Ambient temperature

-70 ... +250

°C

Scope of delivery

2

pieces

Fmax 1 kN, single-actuator

Item No.

315120

Type

8287

Test load Fmax

1/0.5[1]

kN

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

1.1

kN

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

0.65

kN

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

1.1

kN

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

0.65

kN

Operating pressure

0.5 ... 10

bar

Dimensions

Height

180

mm

Width

191

mm

Depth

65

mm

Depth with connection unit

104

mm

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

6

mm

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

11

mm

Opening width, max. with jaws, thickness 5 mm

10/20

mm

Gripping of the specimen

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

Weight per specimen grip, approx.

2.5

kg

Connection, stud

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.

Fmax 2.5 kN, single-actuator

Item No.

317911

Type

8297

Operating principle/identification

For temperature chamber

Adjustability of the opposing jaw

Stepless and in steps

Test load Fmax

2.5

kN

Gripping force at 6 bar, max.

3.6

kN

Gripping force at 10 bar, max.

6

kN

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

Opening width, max. with jaws, thickness 5 mm

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, stud

Ø 20

mm

Ambient temperature

-70 ... +250

°C

Scope of delivery

2

pieces

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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