Wedge Screw Grips

Wedge-screw grips combine the mechanical properties of screw grips and wedge grips. Thickness is adjusted and a preload force is generated via a screw action, Specimen slipping at the beginning of the test is prevented. 

Wedge screw grips

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Key Advantages and Features

  • The main gripping force is generated by the wedge action.
  • The gripping force is proportional to the actual tensile force (self-clamping), ensuring secure gripping of a wide range of materials.
  • Large grip-to-grip separation allows the surface pressure to be kept low, avoiding jaw breaks.
  • The larger grips (from Fmax 50kN) can remain in place while small load cells, specimen grips, test fixtures and test devices are attached to them via the optional mounting unit – a great time-saver.
  • Wedge screw grips with Fmax 50 kN and above can be operated via a pneumatic motor, These specimen grips are opened and closed by a
  • pneumatic motor; the pneumatic actuator is located directly on the specimen grip
  • Low overall height.
  • Strain rate control to DIN EN ISO 6892-1:2009 and ASTM E8 – 09.
Wedge screw grips

Switchable synchronization function

Switchable synchronization allows wedge-screw grips (Fmax 10 kN and over) to grip both symmetrically and asymmetrically. The asymmetry level is easily adjustable and is maintained reliably, even with re-gripping. This enables one-handed operation with either hand, including with asymmetrical specimens, and ensures that the specimen attachment point is always in the test axis.

Image-Article_PH-500N

Wedge Screw Grips 

Fmax 500 N
  • Specimen material:
    Metal, plastics, textile
  • Specimen shape:
    Round specimens (yarn) and flat specimens
  • Type of loading
    Tensile

Advantages and features

  • Because the jaws can be adjusted independently of each other, both symmetrical and asymmetrical specimens can be tested (glued specimen, shear test tensile specimen, etc.).
  • The specimen is held securely due to the external high gripping force (approx. 3.5 times tensile force). The jaws are needle bearing and are run with extra flat wedge angle.
  • accurate test results combined with a high number of cycles for inserting wires and threads and markings on the jaws for manual specimen centering
  • Fast and easy insertion of specimen is enabled due to the ergonomic and open design.
  • Sensitive specimens are always gently gripped via large clamping lengths. This prevents jaw breakage.

Technical data, Fmax 500 N

Item No.

313284

Type

8106

Test load Fmax

0.5

kN

Dimensions

Height

63

mm

Width

94

mm

Depth

28

mm

Gripping of the specimen

The specimen must be gripped with at least 1/2 of the jaw height.

Opening width, max. with jaws

5[1]

mm

Weight per specimen grip, approx.

200

g

Connection, stud

Ø 8

mm

Ambient temperature

-40 ... +250[2]

°C

Scope of delivery

2

pieces
  1. For symmetrical gripping
  1. The temperature range may be limited by a smaller jaw temperature range.
Image-Article_PH-2-5kN

Wedge Screw Grips 

Fmax 2.5 kN
  • Specimen material
    Metals, plastics
  • Specimen shape
    Round and flat specimens
  • Type of loading
    Tensile

Advantages and features

  • The jaws are independently adjustable, enabling symmetrical and asymmetrical (glued specimen or shear test tensile specimen) specimen testing.
  • Needle bearing jaw guides in connection with flat wedge angles generate a gripping force of approximately 3.5 tensile force. In contrast to sliding guides, needle bearing jaw guides reduce friction losses and an unwanted stick slip effect.
  • The specimen grip is equipped with a centering device for threads and thread-like specimens.
  • No synchronization of the jaws.

Technical data, Fmax 2.5 kN

Item No.

313398

Type

8206

Operating principle/identification

Simple version

Test load Fmax

2.5

kN

Dimensions

Height

115

mm

Width

152

mm

Depth

57

mm

Gripping of the specimen

The specimen must be gripped with at least 1/2 of the jaw height.

Opening width, max. with jaws

10[1]

mm

Specimen dimensions

Flat specimen, thickness

0 ... 10

mm

Round specimen, Ø

0 ... 10

mm

Gripping area

Height

60

mm

Width

30

mm

Weight per specimen grip, approx.

3

kg

Connection, stud

Ø 20

mm

Ambient temperature

-40 ... +250[2]

°C

Scope of delivery

2

pieces
  1. For symmetrical gripping
  1. The temperature range may be limited by a smaller jaw temperature range.
Image-Article_PH-10kN

Wedge Screw Grips 

Fmax 10 kN
  • Specimen material:
    Metals, plastics
  • Specimen shape
    Round specimens (wires) and flat specimens
  • Type of loading
    Tensile

 Ideal for use in temperature chambers.

Advantages and features

  • Because the jaws can be adjusted independently of each other, both symmetrical and asymmetrical specimens can be tested (glued specimen, shear test tensile specimen, etc.).
  • The specimen is held securely due to the external high gripping force (approx. 3.5 times tensile force). The jaws are needle bearing and are run with extra flat wedge angle.
  • accurate test results combined with a high number of cycles for inserting wires and threads and adjustable centering stops for flat specimens
  • Fast and easy insertion of specimen is enabled due to the ergonomic and open design.
  • Sensitive specimens are always gently gripped via large clamping lengths. This prevents jaw breakage.
  • The specimen grip can be easily operated in the temperature chamber and quickly reaches its test temperature due to its low mass.

Technical data, Fmax 10 kN

Type

8305

Item No.

021140

Test load Fmax

10

kN

Dimensions

Height

143

mm

Width

246

mm

Depth

108

mm

Gripping of the specimen

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

Opening width, max. with jaws

20[1]

mm

Specimen dimensions

Flat specimen, thickness

>0 ... 20

mm

Round specimen, Ø

>0 ... 20

mm

Weight per specimen grip, approx.

8.6

kg

Connection, stud

Ø 20

mm

Ambient temperature

-70 ... +150[2]

°C

Scope of delivery

2

pieces
  1. For symmetrical gripping
  1. The temperature range may be limited by a smaller jaw temperature range.
04_wedge screw_10kN_plastics-black_makroXtens_FO

Wedge Screw Grips 

Fmax 10 kN and 30 kN
  • Specimen material
    Metals, plastics
  • Specimen shape
    Round and flat specimens
  • Type of loading
    Tensile

Advantages and features

  • Switchable synchronization enables symmetrical and asymmetrical specimen testing.
  • Fast and easy insertion of specimen is enabled due to the ergonomic and open design.
  • The jaws can be be changed quickly and easily without tools if the application changes. The jaws are thus automatically centered.
  • The specimen grip can be easily operated in the temperature chamber and quickly reaches its test temperature due to its low mass.
  • accurate test results combined with a high number of cycles due to the adjustable centering stops for flat specimens
  • You save time, by quickly and easily adapting small specimen grips and test tools to large specimen grips via the T-slotted system. Precise alignment ensures reliable test results.

Technical data, Fmax 10 kN and 30 kN

Item No.

317404[1]

317394[1]

Type

8306

8406

Test load Fmax

10

30

kN

Operating principle/identification

-

-

Dimensions

Height

125

137

mm

Width

319

319

mm

Depth

93

93

mm

Gripping area

Height

60

60

mm

Width

60

60

mm

Gripping of the specimen

The specimen must be gripped with at least 1/2 of the jaw height.

Gripping travel

7

7

mm

Specimen dimensions

Flat specimen, thickness

0 ... 30

0 ... 30

mm

Round specimen, Ø

4 ... 30

4 ... 30

mm

Weight per specimen grip, approx.

15

16

kg

Connection, stud

Ø 20

Ø 36

mm

Ambient temperature

-40 ... +250[2]

-40 ... +250[2]

°C

Scope of delivery

2

2

pieces
  1. Recommended and approved for strain rate control to the standards DIN EN ISO 6892-1:2009 and ASTM E8-09
  1. The temperature range may be limited by a smaller jaw temperature range.
Image-Article_PH-50kN

Wedge Screw Grips 

Fmax 50 kN
  • Specimen material
    Metals, plastics
  • Specimen shape
    Round and flat specimens
  • Type of loading
    Tensile

Advantages and features

  • Synchronized opening and closing the jaws.
  • Synchronization can be switched off; symmetrical and asymmetrical gripping is possible, enabling gripping of asymmetrical specimen (for example glued shear specimen).
  • Jaws can be changed easily without tools.
  • Low overall height.
  • Flat jaws are equipped with a centering stop.
  • 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.

Technical data, Fmax 50 kN

Item No.

317160[1]

318659[1]

Type

8406

8406

Operating principle/identification

Mechanical opening/closing

Motorized opening/closing

Test load Fmax

50

50

kN

Dimensions

Height

146

146

mm

Width

385

407

mm

Depth

115

172

mm

Depth With stop strip

135

mm

Depth with actuation unit

231

Gripping area

Height

80

80

mm

Width

60

60

mm

Gripping of the specimen

The specimen must be gripped with at least 1/2 of the jaw height.

Gripping travel

8

8

mm

Specimen dimensions

Flat specimen, thickness

0 ... 30

0 ... 30

mm

Round specimen, Ø

4 ... 30

4 ... 30

mm

Weight per specimen grip, approx.

37

50

kg

Connection, stud

Ø 36

Ø 36

mm

Ambient temperature

-40 ... +250[2]

+10 ... +35

°C

Scope of delivery

2

2

pieces

Operating pressure, max. of pneumatic motor

7

Air consumption

5

Closing/opening speed at 6 bar

5

Motor noise level

72

Pneumatic connection

DN7

  1. Recommended and approved for strain rate control to the standards DIN EN ISO 6892-1:2009 and ASTM E8-09
  1. The temperature range may be limited by a smaller jaw temperature range.
Image-Article_PH-100kN

Wedge Screw Grips 

Fmax 100 kN
  • Specimen material
    Metals, plastics
  • Specimen shape
    Round and flat specimens
  • Type of loading
    Tensile

Advantages and features

  • Synchronized opening and closing the jaws.
  • Synchronization can be switched off; symmetrical and asymmetrical gripping is possible, enabling gripping of asymmetrical specimen (for example glued shear specimen).
  • Jaws can be changed easily without tools.
  • Low overall height.
  • Flat jaws are equipped with a centering stop.
  • 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.

Technical data, Fmax 100 kN

Item No.

316901[1]

318661[1]

Type

8506

8506

Operating principle/identification

Mechanical opening/closing

Motorized opening/closing

Test load Fmax

100

100

kN

Dimensions

Height

176

177

mm

Width

371

408

mm

Depth

115

172

mm

Depth With stop strip

135

mm

Depth with stop strip

-

Depth with actuation unit

257

Gripping area

Height

80

80

mm

Width

60

60

mm

Gripping of the specimen

The specimen must be gripped with at least 1/2 of the jaw height.

Gripping travel

8

8

mm

Specimen dimensions

Flat specimen, thickness

0 ... 30

0 ... 30

mm

Round specimen, Ø

4 ... 30

4 ... 30

mm

Weight per specimen grip, approx.

44

50

kg

Connection, stud

Ø 60

Ø 60

mm

Ambient temperature

-40 ... +250[2]

+10 ... +35

°C

Scope of delivery

2

2

pieces

Operating pressure, max. of pneumatic motor

7

Air consumption

5

Closing/opening speed at 6 bar

5

Motor noise level

72

Pneumatic connection

DN7

  1. Recommended and approved for strain rate control to the standards DIN EN ISO 6892-1:2009 and ASTM E8-09
  1. The temperature range may be limited by a smaller jaw temperature range.
Image-Article_PH-150kN

Wedge Screw Grips 

Fmax 150 kN
  • Specimen material
    Metals, plastics
  • Specimen shape
    Round and flat specimens
  • Type of loading
    Tensile

Advantages and features

  • Synchronized opening and closing the jaws.
  • Synchronization can be switched off; symmetrical and asymmetrical gripping is possible, enabling gripping of asymmetrical specimen (for example glued shear specimen).
  • Jaws can be changed easily without tools.
  • Low overall height.
  • Flat jaws are equipped with a centering stop.
  • 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.

Technical data, Fmax 150 kN

Item No.

318250[1]

050156[1]

Type

8506

8506

Operating principle/identification

Mechanical opening/closing

Motorized opening/closing

Test load Fmax

150

150

kN

Dimensions

Height

176

190

mm

Width

416

424

mm

Depth

140

140

mm

Depth with stop strip

159

-

mm

Depth with actuation unit

293

Gripping area

Height

80

80

mm

Width

60

60

mm

Gripping of the specimen

The specimen must be gripped with at least 1/2 of the jaw height.

Gripping travel

8

8

mm

Specimen dimensions

Flat specimen, thickness

0 ... 30

0 ... 30

mm

Round specimen, Ø

4 ... 30

4 ... 30

mm

Weight per specimen grip, approx.

49

61

kg

Connection, stud

Ø 60

Ø 60

mm

Ambient temperature

-40 ... +250[2]

+10 ... +35

°C

Scope of delivery

2

2

pieces

Operating pressure, max. of pneumatic motor

7

Air consumption

5

Closing/opening speed at 6 bar

5

Motor noise level

72

Pneumatic connection

DN7

  1. Recommended and approved for strain rate control to the standards DIN EN ISO 6892-1:2009 and ASTM E8-09
  1. The temperature range may be limited by a smaller jaw temperature range.
04_wedge screw_250kN_manual_cracked metal2_FO

Wedge Screw Grips 

Fmax 250 kN
  • Specimen material
    Metals, plastics
  • Specimen shape
    Round and flat specimens
  • Type of loading
    Tensile

Advantages and features

  • Synchronized opening and closing the jaws.
  • Synchronization can be switched off; symmetrical and asymmetrical gripping is possible, enabling gripping of asymmetrical specimen (for example glued shear specimen).
  • Jaws can be changed easily without tools.
  • Flat jaws are equipped with centering stop.
  • 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.

Technical data, Fmax 250 kN

Item No.

318596[1]

318598[1]

Type

8507

8507

Test load Fmax

250

250

kN

Dimensions

Height

252

252

mm

Width

522

548

mm

Depth

158

210

mm

Depth with stop strip

-

mm

Depth with actuation unit

225

Gripping area

Height

100/120

100/120

mm

Width

80

80

mm

Gripping of the specimen

The specimen must be gripped with at least 1/2 of the jaw height.

Gripping travel

8

8

mm

Specimen dimensions

Flat specimen, thickness

0 ... 64

0 ... 64

mm

Round specimen, Ø

4 ... 80

4 ... 80

mm

Weight per specimen grip, approx.

108

112

kg

Connection, stud

Ø 60

Ø 60

mm

Ambient temperature

-40 ... +250[2]

+10 ... +35

°C

Scope of delivery

2

2

pieces

Operating principle/identification

Motorized opening/closing

Operating pressure, max. of pneumatic motor

7

Air consumption

5

Closing/opening speed at 6 bar

5

Motor noise level

≤ 72

Pneumatic connection

DN7

  1. Recommended and approved for strain rate control to the standards DIN EN ISO 6892-1:2009 and ASTM E8-09
  1. The temperature range may be limited by a smaller jaw temperature range.
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