Screw Grips up to 50 kN

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

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Key Advantages and Features 

  • Gripping force depends on the locked rotor torque released by the operator
  • Very easy to operate
  • Large opening widths for flexibility in use
  • Most commonly used screw grips are U-shaped for good accessibility
  • Simple design principle enables standard version to be resistant to high temperatures
  • Depending on the type, these grips have an axial bearing in the gripping unit for increased gripping forces
  • Many screw grips feature free adjustment of both jaws, allowing asymmetrical specimens to be tested
Seal strength of packaging films

Screw Grips

Fmax 1 kN 
  • Specimen material:
    Metal, plastics, textile, paper, wood
  • Specimen shape:
    Round and flat specimens, asymmetrical specimens, sealed and glued specimens
  • Type of loading:
    Tensile, compression, alternating load

Advantages and features

  • 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

Technical data, Fmax 1 kN

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 Fmax

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

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

18[1]

18[1]

18[1]

18[1]

18[2]

18[2]

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 ... +250[3]

-70 ... +250[3]

-70 ... +250[3]

-70 ... +250[3]

-70 ... +250[3]

-70 ... +250[3]

°C

Scope of delivery

2

1

2

1

2

2

pieces
  1. 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.
  1. 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)
  1. The ambient temperature may be limited by a smaller jaw temperature range.
Screw grips 2.5kN

Screw Grips 

Fmax 2.5 kN
  • Specimen material:
    Metal, plastics, textile, paper, wood
  • Specimen shape:
    Round and flat specimens, asymmetrical specimens, sealed and glued specimens
  • Type of loading:
    Tensile, compression, alternating load

Advantages and features

  • 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

Technical data, Fmax 2.5 kN

Item No.

316322

316406

317656

Type

8253

8253

8253

Operating principle/identification

In steps

In steps

Stepless and in steps

Test load Fmax

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

18[1]

18[1]

18[2]

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 ... +250[3]

-70 ... +250[3]

-70 ... +250[3]

°C

Scope of delivery

2

1

2

pieces
  1. 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.
  1. 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)
  1. The ambient temperature may be limited by a smaller jaw temperature range.

Screw Grips

Fmax 5 kN 
  • Specimen material:
    metals, plastics, textiles, wood
  • Specimen shape:
    round and flat specimens, asymmetrical specimens, sealed and glued specimens
  • Type of loading:
    tensile, compression, alternating load

Advantages and features

  • 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.

Technical data, Fmax 5 kN

Item No.

320436

Type

8354 PL[1]

Test load Fmax

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

Jaws supplied

Surface

Vulkollan, smooth

Gripping area

Height

50

mm

Width

60

mm

Hardness

95 Shore A
  1. PL = ProLine
Screw grips 10kN connector

Screw Grips

Fmax 10 kN 
  • Specimen material:
    metals, plastics, textiles, wood
  • Specimen shape:
    round and flat specimens, asymmetrical specimens, sealed and glued specimens
  • Type of loading:
    tensile, compression, alternating load

Advantages and features

  • 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.

Technical data, Fmax 10 kN

Item No.

320436

320440

318587

Type

8354 PL[1]

8354 PL[1]

8354

Test load Fmax

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, pr[2]0.7

-

Hardness

95 Shore A

61 HRC

-

Opening width, max. with jaws

25

25

25[3]

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 ... +250[4]

°C

Scope of delivery

1

1

2

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

Grips for insulating materials 

Fmax 10 kN
  • Specimen material:
    insulating materials
  • Specimen shape:
    flat specimens
  • Type of loading:
    tensile

Advantages and features

  • 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.

Technical data, Fmax 10 kN

Item No.

318405

318407

Type

8330

8330

Test load Fmax

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
Screw grips

Screw Grips

Fmax 20 kN 
  • Specimen material:
    metals, plastics, textiles, wood
  • Specimen shape:
    round and flat specimens, asymmetrical specimens, sealed and glued specimens
  • Type of loading:
    tensile, compression, alternating load

Advantages and features

  • 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.

Technical data, Fmax 20 kN

Item No.

318591

Type

8355

Operating principle/identification

Opposing jaw can be adjusted steplessly

Test load Fmax

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

25[1]

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

0 ... 25

mm

Weight per specimen grip, approx.

8

kg

Connection, stud

Ø 36

mm

Ambient temperature

-70 ... +250[2]

°C

Scope of delivery

2

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

Screw Grips

Fmax 30 kN and Fmax 50 kN
  • Specimen material:
    Metals, plastics, textiles, wood
  • Specimen shape:
    Round and flat specimens
  • Type of loading:
    Tensile, compression, alternating load

Technical data, Fmax 30 kN and Fmax 50 kN

Item No.

325314

315653

Type

8451

8451

Test load Fmax

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 ... +250[1]

-70 ... +250[1]

°C

Weight per specimen grip, approx.

6

6

kg

Scope of delivery

2

2

pieces

Operating principle/identification

Fixed opposing jaw

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

Screw Grips

Fmax 50 kN 
  • Specimen material:
    Metals, plastics, textiles, wood
  • Specimen shape:
    Round and flat specimens
  • Type of loading:
    Tensile, compression, alternating load

Technical data, Fmax 50 kN

Item No.

313626

Type

8455

Operating principle/identification

Fixed opposing jaw

Test load Fmax

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 ... +250[1]

°C

Scope of delivery

2

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