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.

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For temperature chambers
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Product brochure: Specimen grips and test tools

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16.01.2017

Standardized Syringe Testing with ZwickRoell
01.03.2015

A striking solution: ZwickRoell has impact tests on polymers completely covered

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.

Other ZwickRoell specimen grips

Pneumatic Specimen Grips, Single-Actuator

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

Type 8097, Fmax 200 N

Type 8097, Fmax 200 N
Type 8197, Fmax 500 N

Type 8197, Fmax 500 N
Type 8197, Fmax 1 kN

Type 8197, Fmax 1 kN
Type 8397, Fmax 10 kN

Type 8397, Fmax 10 kN
Type 8195, Fmax 1 kN

Type 8195, Fmax 1 kN
Type 8497, Fmax 30 kN

Type 8497, Fmax 30 kN
Type 8297, Fmax 2.5 kN

Type 8297, Fmax 2.5 kN
Type 8397, Fmax 5 kN

Type 8397, Fmax 5 kN
Type 8195, Fmax 20 N and 50 N

Pneumatic specimen grips with integrated control valve

Type 8195, Fmax 20 N and 50 N

Pneumatic specimen grips with integrated control valve

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
Test load F_max	0.02	0.05	kN
Max. gripping force at 6 bar	50		N
Max. gripping force at 10 bar	140		N
Pressure, min.	4	4	bar
Pressure, max.	10	10	bar
Dimensions
Height	90	mm
Width	77	77	mm
Width with handwheel/pneumatic unit	107.5	mm
Depth	60	60	mm
Depth with toggle lever	108	mm
Height
Width with handwheel/pneumatic unit
Depth with toggle lever
Clamping stroke of pneumatically operated side	6		mm
Standard opening width, max.^[1] (with grip inserts)	11		mm
Specimen gripping	The specimen must be gripped over the entire jaw height.
Weight per grip unit, approx.	380		g
Connection, stud	Ø 8		mm
Ambient temperature	+10 to +35	+10 to +35	°C
Scope of delivery	2	2	pieces
Insertion aid	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

The standard 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	with integrated control valve
Test load F_max	0.1	0.2	kN
Max. gripping force at 6 bar	200	400	N
Max. gripping force 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	141.5	mm
Depth	60	60	mm
Depth with toggle lever	109	109	mm
Clamping stroke of pneumatically operated side	4	4	mm
Standard opening width, max.^[1] (with grip inserts)	6	6	mm
Specimen gripping	The specimen must be gripped over the entire jaw height.
Connection, stud	Ø 8	Ø 8	mm
Ambient temperature	+10 to +35	+10 to +35	°C
Weight per grip unit, approx.	530	520	g
Scope of delivery	2	2	pieces
Insertion aid	-	-
Pneumatic connection	DN7 quick-action coupling
Jaws supplied
Surface	no jaws included	no jaws included
Gripping area (H x W)	-	-
Hardness	-	-

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

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 F_max	1	1	kN
Max. gripping force at 6 bar	1	1	kN
Max. gripping force 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 handwheel/pneumatic unit	210	210	mm
Depth	60	60	mm
Clamping stroke of pneumatically operated side	4	4	mm
Standard opening width, max.^[1]	6	6	mm
Specimen gripping	The specimen must be gripped over at least 1/3 of the jaw height.
Weight per grip unit, approx.	1.3	1.46	kg
Connection, stud	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

The standard opening width arises when using grip inserts with 5mm 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

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

Stepless, reproducible adjustment of the gripping pressure is available via a pneumatic control unit. The specimen is held securely and jaw breaks during the test are avoided.

The grips can be opened and closed via foot switch or the materials testing machine remote control, offering a high level of operating convenience.

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/feature	stepped adjustment of opposing jaw	opposing jaw with stepless and stepped adjustment
Test load F_max	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
Dimensions
Height	95	95	mm
Width	207	207	mm
Depth	32	32	mm
Depth with connection unit	74	74	mm
Clamping travel of pneumatically operated side	10.5	10.5	mm
Standard opening width, max.^[1]	20	20	mm
Specimen gripping	The specimen must be gripped over at least 2/3 of the jaw height.
Weight per grip unit, approx.	1.07	1.16	kg
Connection, stud	Ø 8	Ø 8	mm
Ambient temperature	+10 to +35	+10 to +35	°C
Scope of delivery	2	2	pieces

The standard 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 F_max	0.5	kN
Closing force at 3 bar, max.	0.330	kN
Closing force at 6 bar, max.	0.725	kN
Closing force at 10 bar, max.	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
Standard 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, pin	Ø 20	mm
Ambient temperature	+10 to +35	°C
Scope of delivery	1	piece

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

Fmax 1 kN

Item No.	014772	014774
Type	8197	8197
Operating principle/feature	stepped adjustment of opposing jaw	opposing jaw with stepless and stepped adjustment
Test load F_max	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
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
Clamping travel of pneumatically operated side	10.5	10.5	mm
Standard opening width, max.^[1]	20	20	mm
Specimen gripping	The specimen must be gripped over at least 2/3 of the jaw height.
Weight per grip unit, approx.	1.68	1.76	kg
Connection, stud	Ø 20	Ø 20	mm
Ambient temperature	+10 to +35	+10 to +35	°C
Scope of delivery	2	2	pieces

The standard opening width arises when using jaws with 5mm jaw thickness.

Fmax 2.5 kN

Item No.	316449^[1]	316451^[1]
Type	8197	8197
Operating principle/feature	stepped adjustment of opposing jaw	opposing jaw with stepless and stepped adjustment
Test load F_max	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
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
Clamping travel of pneumatically operated side	10.5	10.5	mm
Standard opening width, max.^[2]	20	20	mm
Specimen gripping	The specimen must be gripped over at least 2/3 of the jaw height.
Weight per grip unit, approx.	2.4	2.5	kg
Connection, stud	Ø 20	Ø 20	mm
Ambient temperature	+10 to +35	+10 to +35	°C
Scope of delivery	2	2	pieces

If used in conjunction with optical extensometers: care must be taken that the area to be measured is not obscured by the pneumatic actuator.

The standard 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

Stepless, reproducible adjustment of the gripping pressure is available via a pneumatic control unit. The specimen is held securely and jaw breaks during the test are avoided.

The grips can be opened and closed via foot switch or the materials testing machine remote control, offering a high level of 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 F_max	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
Clamping travel of pneumatically operated side	12.5	mm
Standard 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.	8.2	kg
Connection, stud	Ø 20	mm
Ambient temperature	+10 to +35	°C
Scope of delivery	2	pieces

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

The standard opening width arises when using jaws with 5mm jaw thickness.

Fmax 10 kN

Item No.	317654^[1]
Type	8397
Test load F_max	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
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
Standard 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

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

The standard opening width arises when using jaws with 5mm jaw thickness.

Fmax 30 kN

Item No.	317588^[1]
Type	8497
Test load F_max	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
Clamping travel of pneumatically operated side	12.5	mm
Standard 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.	15	kg
Connection, stud	Ø 36	mm
Ambient temperature	+10 to +35	°C
Scope of delivery	2	pieces

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

The standard opening width arises when using jaws with 5mm jaw thickness.

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,

Specimen grips with control valve can be mounted in different ways

Fmax 20 N

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

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

Pneumatic specimen grips, double-actuator

Fmax 200 N and 1 kN

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

Type	8187	8287
Item No.	313852
Test load (F_max)	0.2 to 0.1^[1]		kN
Closing force, max. at 6 bar	0.2 to 0.1		kN
Max. closing force at 10 bar	0.33 to 0.16		kN
Pressure, min.	1.5		bar
Pressure, max.	10		bar
Gripping distance of pneumatically operated side	12/22	12/22	mm
Standard opening width, max.^[2]With jaws	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.
Connection	Ø 8		mm
Ambient temperature	+10 to +35		°C
Weight per specimen grip (without jaws), approx.	1	2.8	kg
Scope of delivery	2	2	piece(s)

The opening width can be changed from 0 - 12 mm to 0 - 22 mm. Thus, the closing force is reduced by 50%.

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

Pneumatic specimen grips, double-actuator

Fmax 2.5 kN

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

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

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 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

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

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

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

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

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, 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

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

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

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 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 (F_max)	50		kN
Max. closing force at 6 bar	60		kN
Max. closing force at 10 bar	100		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 overhang	186	190	mm
Gripping travel^[2]	21	15	mm
Opening width/specimen thickness	See jaws table	See jaw 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	piece(s)

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

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

Type	8304
Item No.	1004956^[1]
Test load F_max	10	kN
Operating principle/identification	double actuator (wedge action)
Gripping pressure at 6 bar	18.46	kN
Gripping pressure 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
Clamping length	min. 20	mm
Weight
per grip unit, approx.	13.7	kg
Jaws (pair)	0.75	kg
Optional stopper system	0.5	kg
Connection, stud	Ø 20	mm
Ambient temperature	0 to +50	°C
Scope of delivery	2	pieces

The 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 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.

Specimen grip for use in the temperature chamber⁽⁵⁾

Type 8097, Fmax 200 N, single-actuator

Type 8097, Fmax 200 N, single-actuator
Type 8297, Fmax 2.5 kN, single-actuator

Type 8297, Fmax 2.5 kN, single-actuator
Type 8287, Fmax 1 kN, single-actuator and double-actuator

The maximum opening width can be adjusted by adjusting an internal lever. A greater opening width results, however, in a lesser gripping force and thus a lesser Fmax.

Type 8287, Fmax 1 kN, single-actuator and double-actuator

The maximum opening width can be adjusted by adjusting an internal lever. A greater opening width results, however, in a lesser gripping force and thus a lesser Fmax.
Type 8304, Fmax 10 kN, double-actuator

Type 8304, Fmax 10 kN, double-actuator
Type 8397, Fmax 10 kN, double-actuator

These specimen grips can be installed in temperature chambers under 45° or 90°.

Type 8397, Fmax 10 kN, double-actuator

These specimen grips can be installed in temperature chambers under 45° or 90°.

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

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

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.

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
Closing force, max. at 6 bar
at 12 mm opening width, approx.	1	kN
at 22 mm opening width, approx.	0.5	kN
Closing force, max. at 10 bar and 12 mm gripping distance, approx.^[1]	1.1	kN
Closing force, max. at 10 bar and 22 mm gripping distance, approx.^[1]	0.65	kN
Standard opening width, max. (with jaws)^[2]	12/22	mm
Gripping of the specimen	The specimen must be gripped above at least 2/3 of the jaw height
Gripping area (distance between the jaws):
at F_max 1 kN	0 ...10	mm
at F_max 0.5 kN	0 to 20	mm
Pressure, min.	1	bar
Pressure, max.	10	bar
Height	130	mm
Installation height	180	mm
width	240	mm
depth	65	mm
Depth with connection unit	128	mm
Connector	Bolt Ø 20 mm
Ambient temperature	-70 to +250	°C
Weight per specimen grip, without jaws, approx.	2.8	kg
Scope of delivery	2	pieces

The gripping distance can be changed from 0 - 12 mm to 0 - 22 mm. Thus, the closing force is reduced by 50%.

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
Operating principle/identification	For temperature chamber
Adjustability of the opposing jaw	Stepless and step-by-step
Test load F_max	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

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

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

Pneumatic Control Unit for Specimen Grips

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.