Specimen grips for testing screws

We firmly grip all screws

Form-fit force transmission via shouldered, screw or threaded heads. The specimen, along with its corresponding holder, is inserted into the grips, which are freely accessible from the front, and is automatically centered in the tensile axis.

Specimen grips are available with Fmax 50 kN, 250 kN, 600 kN and 1200 kN.
Specimen holder anti-backlash option ensures that the specimen is held securely, minimizing holder recoil at specimen break.
Low overall height saves space in the test area.
Due to the form-fit design, these specimens do not require ancillary units.
Strain rate control in accordance with standards DIN EN ISO 6892-1:2009 and ASTM E8 – 09.

Advantages & features

Advantages, 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.

Application, Fmax 50 kN

Specimen material:
Steel, non-ferrous metals, plastics
Specimen shape/type of loading/standards:
Tensile tests on:
- Threaded fittings to DIN 50125 Shape B and ISO 6892
- Screws with a plane head support (e.g., to EN ISO 4762, ISO 4017, DIN 6912) and to DIN EN ISO 898-1 (straight tensile test)
- Button-head specimens to DIN 50125, Shape C
- Button-head specimens to GOST 1497

Advantages, Fmax 250 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.
Full flexibility: Specimen grips can be mounted on their own or to existing test tools via various connection options. Specimen grips for Type 8496 can be used for specimen holder Type 8596 via an adapter.
Low overall height saves space in the test area.
Pure Mechanical solution: Pneumatic control unit and hydraulic power pack are not required.

Application, Fmax 250 kN

Specimen material:
Steel, non-ferrous metals, plastics
Specimen shape/type of loading/standards:
Tensile test for
- Threaded fittings to DIN 50125 shape B and ISO 6892
- Screws with a plane head support (e.g., to EN ISO 4762, EN 24017, DIN 6912) in accordance with DIN EN ISO 898-1 (straight tensile test)
- Screws to DIN EN ISO 898-1 DIN EN ISO 898-1 (wedge tensile test)
- Dumbbell specimens to DIN 50125, shape C
- Dumbbell specimens to GOST 1497

Advantages, Fmax 1200 kN

Various design details ensure that force distribution is absolutely symmetrical:
- symmetrical contact surfaces in the specimen grips: the specimen holders bear on two symmetrical contact surfaces in the specimen grips;
- holders enclose specimen: all specimen holders completely enclose the specimen; a support sleeve is located around the split dumbbell-specimen holders, additionally preventing them from spreading.
Specimen-holder recoil at specimen break absorbed by dampers.
Purely mechanical solution: no pneumatic control unit or hydraulic power pack required.
Specimen holders for the 250kN grips can also be used in the 600kN grips.
Adapter plates for attaching additional test fixtures to the grips can be supplied.

Application, Fmax 1200 kN

These specimen grips are designed for tests on button-head and threaded-end specimens and for testing nuts and bolts/screws.

Specimen holders are currently available for the following specimens and standards:

threads as per DIN 50125 Type B and ISO 6892-1
screws/bolts/studs as per ISO 898-1 (straight tensile test and oblique tensile test)
dumbbell specimens as per DIN 50125, Type C
nuts as per ISO 898-2.

Specimen holders for additional standards (e.g. ASTM E8) are available on application.

Specimen Grips, Fmax 1200 kN

Specimen Grips, Fmax 50 kN

Screw test_type 8496_50 kN_threaded mounting_makroxtens

ProLine materials testing machine, specimen grip, Fmax 50 kN makroXtens extensometer

Specimen Grips, Fmax 250 kN

For testing to DIN 50125 Form C

For testing to GOST 1497 Type III

Technical overview

Item No.	320717¹
Type	8496
Operating principle/identification	Form fitting force transmission
Locking	Yes
Test load F_max	50	kN
Heightwithout inserts	197	mm
Diameter, outer, max.	88	mm
Screw-in depth, min.	1.5 x nominal thread size
Connection, stud	Ø 36	mm
Ambient temperature	-70 ... +250	°C
Scope of delivery	2	piece(s)

Recommended and approved for strain rate control to the standards DIN EN ISO 6892-1:2009 and ASTM E8-09

Item No.	320717¹	021816²	021821
Type	8496	8596	8596
Operating principle/identification	Form fitting force transmission	Positive clamping force transmission	Positive clamping force transmission
Locking	Yes
Test load F_max	50	250	250	kN
Heightwithout inserts	197			mm
Diameter, outer, max.	88	137	137	mm
Screw-in depth, min.	1.5 x nominal thread size	1.5 x nominal thread size	1.5 x nominal thread size
Connection, stud	Ø 36	Various connections	Various connections	mm
Ambient temperature	-70 ... +250	-70 ... +250	-70 ... +250	°C
Scope of delivery	2	2	2	piece(s)
Strain		Yes	No
Height without inserts		154	100
Weight per specimen grip, approx.			6.5

Recommended and approved for strain rate control to the 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.

Max. test load	400 kN	600 kN	1200 kN
Item No.	1082736	3002330	3002734
Overall height (1 grip unit, no inserts)	222	187	241	mm
Diameter (grip body)	160	195	310	mm
Weight per piece	38	38	130	kg
Scope of delivery	2	2	2	pieces
Mounting options	load cell, crosshead, hydraulic grips	load cell, crosshead, hydraulic grips	load cell, crosshead

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Related products and accessories

Downloads

Product information: Specimen grips for screws, shoulder-headed and threaded-head specimens PDF 1,016 KB
- DE
- EN
Product information: Specimen grips for screws, shoulder and threaded head specimens, Fmax 50 kN/250 kN PDF 309 KB
- DE
- EN

Specimen Grips for Testing Screws