Pneumatic grips – double actuator

Strain rate control to standards DIN EN ISO 6892-1:2009 and ASTM E8-09.

Pneumatic 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 actuators acting on the jaws directly or via a lever system.

The double-actuator pneumatic grip always closes symmetrically with respect to the tensile axis, thereby eliminating the need for thickness adjustment.

Advantages & features

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.

Advantages

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

Specimen grip with constant gripping force

Pneumatic specimen grips are ideal for clamping-sensitive materials or if a high specimen throughput is required. The gripping force always remains constant, regardless of test load.

Precise specimen gripping

Double-actuator pneumatic grips always close symmetrically with respect to the tensile axis. This means the specimen is clamped in a precise axial position. It is not necessary to set the specimen thickness.

Pneumatic grip in the temperature chamber

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.

Pneumatic Control Unit for Specimen Grips

The closing force of the pneumatic 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 via the remote control of the materials testing machine for greater operating comfort.

More information about the pneumatic control unit

Picture gallery

Pneumatic grips type 8287, Fmax 1 kN

Pneumatic grips type 8297, Fmax 2.5 kN

Pneumatic grips type 8095, Fmax 20 N, with flexible mounting options for control valve

Pneumatic grips type 8497, Fmax 50 kN

Technical overview

Item No.	1106791
Type	8095
Test load F_max	0.02	kN
Operating pressure	0 ... 8	bar
The operating pressure depends on the upstream components.
Gripping force at 6 bar	115	N
Gripping force at 8 bar	150	N
Opening width with jaws	5	mm
Gripping of the specimen	The specimen must be gripped with the entire height of the jaw.
Dimensions
Height	102	mm
Width	57	mm
Depth	60	mm
Connection, hole	Ø 8	mm
Weight per specimen grip, approx.	118	g
Ambient temperature	+10 ... +35	°C
Scope of delivery
Specimen grips	2	piece(s)
Valve unit (holding bracket and toggle valve with throttle check valve)	2	piece(s)
Pneumatic connection	DN7 quick action coupling

Type	8187	8287
Item No.	1106792	1106793
Operating principle/identification	Opening width adjustable via lever	Opening width adjustable via lever
Test load F_max	0.2/0.1¹	0.5/1¹	kN
Gripping force, max. at 6 bar	0.2/0.1		kN
Gripping force, max. at 10 bar	0.33/0.16		kN
Operating pressure	0.5 ... 10	1 ... 10	bar
Dimensions
Height	95	160	mm
Width	202	240	mm
Depth	42	65	mm
Depthwith connection unit	88	108	mm
Gripping travel of pneumatically operated side	12/22		mm
Opening width with jaws, 5 mm thickness	12/22²		mm
Gripping of the specimen	The specimen must be gripped with at least 2/3 of the jaw height.
Connection, stud	Ø 8		mm
Ambient temperature	+10 ... +35	+10 ... +35	°C
Weight per specimen grip, approx.	1	2.8	kg
Scope of delivery	2	2	piece(s)
Gripping forceAt 6 bar
At opening width 12 mm, approx.		1.1
At opening width 22 mm, approx.		0.6
Gripping forceAt 10 bar
At opening width 12 mm, approx.		1.8
At opening width 22 mm, approx.		1.1
Opening width		12/22²
Connection, hole		Ø 20

The gripping stroke is adjustable from 0 - 12 mm to 0 - 22 mm. This reduces the gripping force by 50 % to 100 N and 500 N.
The opening width is the result of using jaw inserts with 5 mm jaw thickness.

Item No.	1106794	1106831
Type	8297	F8297
Test load F_max	2.5	2.5	kN
Operating pressure	1.5 ... 10	1.5 ... 10	bar
The operating pressure depends on the upstream components.
Gripping force at 6 bar	6.5	6.5	kN
Gripping force at 10 bar	10.5	10.5	kN
Opening width with jaws, 5 mm thickness¹	20	20	mm
Gripping of the specimen	The specimen must be gripped with at least 2/3 of the jaw height.
Dimensions
Height	170	170	mm
Height with centering stop	182	182	mm
Width	210	210	mm
Depth	60	60	mm
Depthwith connection unit	110	110	mm
Connection, hole	Ø 20	Ø 20	mm
Weight per specimen grip, approx.	4.7	4.7	kg
Ambient temperature	+10 ... +35	+10 ... +35	°C
Scope of delivery	2	2	piece(s)

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

Item No.	1106797¹	1106798¹
Type	8397	8497
Test load F_max	10	20	kN
Operating pressure	1 ... 10	1 ... 10	bar
The operating pressure depends on the upstream components.
Gripping force at 6 bar	27	27	kN
Gripping force at 10 bar	45	45	kN
Opening width with jaws, 5 mm thickness²	25	25	mm
Gripping travel of pneumatically operated side³	10	10	mm
Gripping of the specimen	The specimen must be gripped with at least 2/3 of the jaw height.
Dimensions
Height	208	225	mm
Width	242	242	mm
Depth	112	112	mm
Depthwith connection unit	162	162	mm
Connection, hole	Ø 20	Ø 36	mm
Weight per specimen grip, approx.	14	14	kg
Ambient temperature	+10 ... +35	+10 ... +35	°C
Scope of delivery	2	2	piece(s)

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

Item No.	1106799¹
Type	8497
Test load F_max	20	kN
Operating pressure	1 ... 8	bar
The operating pressure depends on the upstream components.
Gripping force at 6 bar	50	kN
Gripping force at 8 bar	68	kN
Opening width with jaws, 5 mm thickness²	20	mm
Gripping travel of pneumatically operated side³	8	mm
Gripping of the specimen	The specimen must be gripped with at least 1/2 of the jaw height.
Dimensions
Height	225	mm
Width	242	mm
Depth	112	mm
Depthwith connection unit	162	mm
Connection, hole	Ø 36	mm
Weight per specimen grip, approx.	14	kg
Ambient temperature	+10 ... +35	°C
Scope of delivery	2	piece(s)

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

Item No.	1106801¹	1106802¹
Type	8497	8597
Test load F_max	50	100	kN
Operating pressure	1 ... 10	1 ... 10	bar
The operating pressure depends on the upstream components.
Gripping force at 6 bar	60	110	kN
Gripping force at 10 bar	100	170	kN
Opening width with jaws	See Jaws table	See Jaws table
Gripping travel ²	21	15	mm
Gripping of the specimen	The specimen must be gripped with at least 2/3 of the jaw height.
Dimensions
Height	306	341	mm
Width	390	390	mm
Depth	156	156	mm
Depthwith connection unit	206	206	mm
Connection, hole	Ø 36	Ø 60	mm
Weight per specimen grip, approx.	57	53	kg
Ambient temperature	+10 ... +35	+10 ... +35	°C
Scope of delivery	2	2	piece(s)

Recommended and approved for strain rate control compliant to 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

Item No.	1106805
Type	8287
Test load F_max	1/0.5	kN
Operating pressure	6 ... 10	bar
The operating pressure depends on the upstream components.
Gripping force at 6 bar
Opening width range 1, approx.¹	1	kN
Opening width range 2, approx.¹	0.6	kN
Gripping force at 10 bar
Opening width range 1, approx.¹	1.8	kN
Opening width range 2, approx.¹	1	kN
Opening width with jaws, 5 mm thickness
Range 1	0 … 12¹	mm
Range 2	0 … 22¹	mm
Gripping of the specimen	The specimen must be gripped with at least 2/3 of the jaw height.
Dimensions
Height	180	mm
Width	240	mm
Depth	65	mm
Depthwith pneumatic tubes	140	mm
Connection, hole	Ø 20	mm
Weight per specimen grip, approx.	2.8	kg
Ambient temperature	-70 ... +250	°C
Scope of delivery	2	piece(s)

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

Item No.	1106807	1106808
Type	8397	8497
Operating principle/identification	For temperature chamber	For temperature chamber
Test load F_max	10	20	kN
Operating pressure	1.5 ... 6	1.5 ... 6	bar
The operating pressure depends on the upstream components.
Gripping force at 6 bar	25	35	kN
Opening width with jaws, 5 mm thickness¹	25	25	mm
Gripping travel	10	10	mm
Gripping of the specimen	The specimen must be gripped with at least 2/3 of the jaw height.
Dimensions
Height			mm
Width	242	242	mm
Depth	112	112	mm
Connection, hole	Ø 20	Ø 36	mm
Weight per specimen grip, approx.	14	14	kg
Ambient temperature	-70 ... +250	-70 ... +250	°C
Scope of delivery	2	2	piece(s)

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

Pneumatic grip in the temperature chamber

Pneumatic grips for the temperature chamber

Type 8287, Fmax 1 kN, single and double actuator

Type 8397, Fmax 10 kN, double actuator

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Downloads

Product brochure: Specimen Grips and Test Tools PDF 4 MB
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- EN
Product information: Pneumatic grips, Fmax 20 N PDF 590 KB
- DE
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Product information: Pneumatic grips, Fmax 200 N/1 kN PDF 316 KB
- EN
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Product Information: Pneumatic Grips, Fmax 2.5 kN PDF 517 KB
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Product information: Pneumatic grips, Fmax 10 kN/20 kN PDF 805 KB
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Product Information: Pneumatic Grips, Fmax 50 kN/100 kN PDF 661 KB
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Product information: Pneumatic grips for temperature chambers, Fmax 10 kN / 20 kN PDF 3 MB
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- EN
Product Information: Pneumatic Grips for Temperature Chambers, Fmax 1 kN PDF 604 KB
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Double actuator

Function description

Advantages

Specimen grip with constant gripping force

Precise specimen gripping

Pneumatic grip in the temperature chamber

Pneumatic Control Unit for Specimen Grips