Screw grips up to 50 kN

Material

Metals
Plastics
Paper
Wood

Test load

1 kN - 50 kN

Specimen shape

Round specimens
Flat specimens
Asymmetrical specimens
Sealed specimens

Type of test

Tensile
Compression
Alternating load

The screw grip for thin specimens

In screw grips the gripping force is applied manually or via an electric motor. These grips are used mostly for smaller test loads (from 1 kN to max. 50 kN) and thinner specimens—fine wires, fibers, films.

Advantages & features

General advantages

Adjustable opposing jaw for fast, easy testing, including joined (asymmetrical) specimens

If the test configuration changes the jaws can be changed quickly and easily - no tools required. The jaws are centered automatically.

The use of ball bearings enables secure gripping of the specimen even at low operating forces.

Large opening width enables flexibility in use.

Reliable specimen gripping guaranteed even with varying applications. Large range of jaws allows optimum matching of the grips to your application.

Even specimens prone to shrinkage are securely held via automatic re-tightening by means of a laminated plate spring

The grips are easy to operate in a temperature chamber and reach the test temperature quickly thanks to their very low mass.

Precise test results combined with high number of cycles achieved through centric insertion of specimen using easily adjustable centering stop.

Ergonomic, open design for fast, easy specimen insertion and clamping

Fmax 1 kN

Adjustable opposing jaw for fast, easy testing, including joined (asymmetrical) specimens

If the test configuration changes the jaws can be changed quickly and easily - no tools required. The jaws are centered automatically.

The use of ball bearings enables secure gripping of the specimen even at low operating forces.

Large opening width enables flexibility in use.

Reliable specimen gripping guaranteed even with varying applications. Large range of jaws allows optimum matching of the grips to your application.

Even specimens prone to shrinkage are securely held via automatic re-tightening by means of a laminated plate spring

The grips are easy to operate in a temperature chamber and reach the test temperature quickly thanks to their very low mass.

Precise test results combined with high number of cycles achieved through centric insertion of specimen using easily adjustable centering stop.

Ergonomic, open design for fast, easy specimen insertion and clamping

Fmax 2.5 kN

Large opening widths offer flexibility.
Adjustable opposing jaws allows eccentric specimen gripping, enabling asymmetrical gripping of specimens.
A range of jaws ensures optimum matching to test material: Various materials, surface structures and gripping surface sizes are available.
Jaws can be changed without tools. Easy side insertion into specimen grip and centering and fixing of jaws follow automatically.
High gripping force is achieved through the axial bearing and gear ratio in the clamping unit.
Prestressed spring disk induces automatic retightening in smaller areas. Specimens with lower thickness reduction can also be gripped securely over the course of the entire test.
High temperature resistance (-70 to +250 °C) is ideal for use in temperature chambers.
Simple handling
The U-design provides good accessibility to the screw grip and offers ample space for flexible specimen ends

Fmax 5 kN

Adjustable opposing jaw for fast, easy testing, including joined (asymmetrical) specimens

The use of ball bearings enables secure gripping of the specimen even at low operating forces.

Large opening width enables flexibility in use.

Ergonomic, open design for fast, easy specimen insertion and clamping

Uniform, parallel closing/gripping via precision 4-column guides ensures specimen is held securely.

Fmax 10 kN

No tools required for jaw change; simply slide into grips from side. Jaws are centered and locked into place automatically.
High temperature resistance (-70 to +250 °C) makes the grips ideal for use in temperature chambers.
Integrated jaw mountings.

Fmax 10 kN, insulating materials

The clamping distance is symmetrical to the tensile axis. This is advantageous because the specimen is not subject to bending moments.
Secure gripping is ensured by protruding pins located in the jaws.
A support grip located in the center of the screw grips facilitates gripping and vertical alignment of the specimen.

Fmax 20 kN

High temperature resistance (-70 to +250 °C) is ideal for use in temperature chambers.
Integrated jaw mounting.
An increased closing force is achieved through the axial bearing in the clamping unit.
Jaws can be changed without tools. Easy side insertion into specimen grip and centering and fixing of jaws follow automatically.

Fmax 50 kN

Absolute symmetrical force distribution is ensured through various design details.
- Anti-backlash option for specimen holders: Play-free specimen location enables precise alignment in the tensile axis — essential for use with optical extension measurement systems.
- Symmetrical bearing surfaces in the specimen grips: The specimen holders bear on two symmetrical contact surfaces in the specimen grips.
- Specimen fully enclosed by all specimen holders: All specimen holders completely surround the specimen. A support sleeve is placed around the split holders for dumbbell specimens.
This also prevents them from spreading, minimizing holder recoil at specimen break.
Low overall height saves space in the test area.
Pure Mechanical solution: Pneumatic control unit and hydraulic power pack are not required.

Screw grips, Fmax 1 kN

Screw grips, Fmax 2.5 kN

Screw grips, Fmax 10 kN for insulating materials

Screw grips, Fmax 10 kN

Screw grips, Fmax 20 kN

Technical overview

Item No.	316264	316526	014764	014766	317660	014768
Type	8133	8133	8133	8133	8133	8133
Operating principle/identification	In steps	In steps	In steps	In steps	In steps and stepless	In steps and stepless
Test load F_max	1	1	1	1	1	1	kN
Dimensions
Height
Without overhang	85	85	85	85	85	85	mm
With overhang	95	95	95	95	95	95	mm
Width	176	176	176	176	208		mm
Depth
Without hand wheel	32	32	32	32	32	32	mm
With hand wheel	50	50	50	50	50	50	mm
Gripping area
Height	30	30	30	30	30	30	mm
Width	60	60	60	60	60	60	mm
Opening width, max. with jaws, thickness 5 mm	18¹	18¹	18¹	18¹	18²	18²	mm
Gripping of the specimen	The specimen must be gripped with at least 2/3 of the jaw height
Specimen dimensions
Flat specimen, thickness	0 ... 18	0 ... 18	0 ... 18	0 ... 18	0 ... 18	0 ... 18	mm
Round specimen, Ø	0 ... 18	0 ... 18	0 ... 18	0 ... 18	0 ... 18	0 ... 18	mm
Weight per specimen grip, approx.	0.69	0.69	0.76	0.76	0.82	0.9	kg
Connection, stud	Ø 8	Ø 8	Ø 20	Ø 20	Ø 8	Ø 20	mm
Ambient temperature	-70 ... +250³	-70 ... +250³	-70 ... +250³	-70 ... +250³	-70 ... +250³	-70 ... +250³	°C
Scope of delivery	2	1	2	1	2	2	pieces

This opening width is a result of using jaws with 5 mm jaw strength and an opposing jaw that is outwardly adjusted by 9 mm. This is also the maximum specimen thickness for symmetrically tensioned specimens.
This opening width is a result of using jaws with 5 mm jaw thickness and an opposing jaw in its initial position (= adjustment marks coincide)
The ambient temperature may be limited by a smaller jaw temperature range.

Item No.	316322	316406	317656
Type	8253	8253	8253
Operating principle/identification	In steps	In steps	Stepless and in steps
Test load F_max	2.5	2.5	2.5	kN
Dimensions
Height
Without overhang	95	95	95	mm
With overhang	100	100	100	mm
Width	196	196	201	mm
Depth
Without hand wheel	32	32	32	mm
With hand wheel	50	50	50	mm
Gripping area
Height	30	30	30	mm
Width	60	60	60	mm
Opening width, max. with jaws, thickness 5 mm	18¹	18¹	18²	mm
Gripping of the specimen	The specimen must be gripped with at least 2/3 of the jaw height.
Specimen dimensions
Flat specimen, thickness	0 ... 18	0 ... 18	0 ... 18	mm
Round specimen, Ø	0 ... 18	0 ... 18	0 ... 18	mm
Weight per specimen grip, approx.	1.2	1.2	1.3	kg
Connection, stud	Ø 20	Ø 20	Ø 20	mm
Ambient temperature	-70 ... +250³	-70 ... +250³	-70 ... +250³	°C
Scope of delivery	2	1	2	pieces

This opening width is a result of using grip inserts with 5 mm jaw strength and an opposing jaw that is outwardly adjusted by 9 mm. This is also the maximum specimen thickness for symmetrically tensioned specimens.
This standard opening width is a result of using jaws with 5 mm jaw thickness and an opposing jaw in its initial position (= adjustment marks coincide)
The ambient temperature may be limited by a smaller jaw temperature range.

Item No.	320436
Type	8354
Test load F_max	5	kN
Dimensions
Height	125	mm
Width	225	mm
Depth	60	mm
Opening width, max. with jaws	25	mm
Gripping of the specimen	The specimen must be gripped with at least 3/4 of the jaw height.
Specimen dimensions
Flat specimen, thickness	24	mm
Weight per specimen grip, approx.	3.8	kg
Connection, stud	Ø 20	mm
Ambient temperature	+10 ... +35	°C
Scope of delivery	1	piece(s)
Jaws supplied
Surface	Vulkollan, smooth
Gripping area
Height	50	mm
Width	60	mm
Hardness	88 ± 3 Shore (A)

Item No.	320436	320440	318587
Type	8354	8354	8354
Test load F_max	5	10	10	kN
Dimensions
Height	125	125	135	mm
Width	225	225	222	mm
Depth	60	60	60	mm
Jaws supplied
Gripping area
Height	50	50	-	mm
Width	60	60	-	mm
Surface	Vulkollan, smooth	Steel, pr¹0.7	-
Hardness	95 Shore A	61 HRC	-
Opening width, max. with jaws	25	25	25²	mm
Gripping of the specimen	The specimen must be gripped with at least 3/4 of the jaw height.
Specimen dimensions
Flat specimen, thickness	24	24	0 ... 25	mm
Round specimen, Ø		24	0 ... 25
Weight per specimen grip, approx.	3.8	3.9	7	kg
Connection, stud	Ø 20	Ø 20	Ø 20	mm
Ambient temperature	+10 ... +35	+10 ... +35	-70 ... +250³	°C
Scope of delivery	1	1	2	piece

Pr = pyramid grid
This opening width is the result of using jaws with 5 mm jaw strength.
The ambient temperature may be limited by a smaller jaw temperature range.

Item No.	318405	318407
Type	8330	8330
Test load F_max	10	10	kN
Dimensions
Height	234	244	mm
Width	256	370	mm
Width with hand wheel	366	480	mm
Depth	500	500	mm
Opening width, max. with jaws	See jaws	See jaws
Weight per specimen grip, approx.	30	32	kg
Connection, stud	Ø 20	Ø 20	mm
Ambient temperature	0 ... +50	0 ... +50	°C
Scope of delivery	2	2	pieces

Item No.	318591
Type	8355
Operating principle/identification	Opposing jaw can be adjusted steplessly
Test load F_max	20	kN
Gripping force, at 30 Nm tightening torque	40	kN
Gripping distance	1.5	mm
Dimensions
Height	155	mm
Width	250	mm
Depth	60	mm
Opening width, max. with jaws, thickness 5 mm	25¹	mm
Gripping of the specimen	The specimen must be gripped with at least 3/4 of the jaw height.
Specimen dimensions
Flat specimen, thickness	0 ... 25	mm
Round specimen, Ø	4 ... 10	mm
Weight per specimen grip, approx.	8	kg
Connection, stud	Ø 36	mm
Ambient temperature	-70 ... +250²	°C
Scope of delivery	2	pieces

This opening width is the result of using jaws with 5 mm jaw strength.
The ambient temperature may be limited by a smaller jaw temperature range.

Item No.	325314	315653
Type	8451	8451
Test load F_max	30	50	kN
Dimensions
Height	130	130	mm
Width	108	108	mm
Depth	139	139	mm
Adjustability of the opposing jaw	None	None
Opening width, max. with jaws	10	10	mm
Gripping of the specimen	The specimen must be gripped with at least 3/4 of the jaw height.
Connection, stud	Ø 36	Ø 36	mm
Ambient temperature	-70 ... +250¹	-70 ... +250¹	°C
Weight per specimen grip, approx.	6	6	kg
Scope of delivery	2	2	pieces
Operating principle/identification		Fixed opposing jaw

The ambient temperature may be limited by a smaller jaw temperature range.

Item No.	313626
Type	8455
Operating principle/identification	Fixed opposing jaw
Test load F_max	50	kN
Dimensions
Height	170	mm
Width	200	mm
Depth	213	mm
Opening width, max. with jaws	25	mm
Gripping of the specimen	The specimen must be gripped with at least 3/4 of the jaw height.
Weight per specimen grip, approx.	20.3	kg
Connection, stud	Ø 36	mm
Ambient temperature	-70 ... +250¹	°C
Scope of delivery	2	pieces

The ambient temperature may be limited by a smaller jaw temperature range.

Do you have any questions regarding our products?

Please feel free to contact our product experts.
We look forward to discussing your needs.

Downloads

Product brochure: Specimen Grips and Test Tools PDF 4 MB
- DE
- EN
Product information: Screw grips, Fmax 1 kN PDF 493 KB
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- EN
Product information: Screw grips, Fmax 2.5 kN PDF 2 MB
- DE
- EN
Product information: Screw grips, Fmax 5 kN/10 kN PDF 485 KB
- DE
- EN
Product information: Specimen grips for insulating material, Fmax 10 kN PDF 860 KB
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- EN
Product information: Screw grips, Fmax 20 kN PDF 208 KB
- DE
- EN
Product information: Specimen grips for screws, shoulder and threaded head specimens, Fmax 50 kN/250 kN PDF 309 KB
- DE
- EN

For large forces