Tensile testing specialist

For over 30 years, 3R has been developing mechanical and hydraulic tooling for tensile tests.

We provide a very wide catalog of grips, jaws, adapters, clamping systems and accessories, covering a capacity range from 100 N to 2000 kN, for tests at ambient temperature or in climatic chambers.

Our expertise is based on three principles:

• The versatility of configurations,
• The robustness of solutions,
• The precision of specimen holding regardless of conditions.

Which tensile tooling to choose?

Grips and jaws are essential elements in tensile tests: they guarantee reliable specimen holding throughout the test, without slippage or damage. To properly select your tooling, it is essential to define:

• The material tested (metal, polymer, composite, elastomer, wood…)
• The specimen shape (flat, round, profiled, serrated)
• Test conditions (ambient temperature, elevated temperature, controlled environment).

Depending on thetype of material and test objective, you will choose a system:

• Mechanical (screw or lever) for low and medium loads or for integration in climatic chambers,
• Hydraulic for high forces or very rigid materials,
• Pneumatic for repeated, flexible or automated tests,

Note: each grip can be equipped with a set of interchangeable jaws, specifically designed for the specimen surface type (smooth, grooved, fragile…).

Our tensile tooling categories

Category	Models & specifications	Capacity	Compatible specimen type	Operating conditions
Standard grips	Screw-type Self-tightening Lever-type Mixed with inserts Compact for chambers	100N to 300 kN	Flat, plane, round, non-machined, polymers, composites, soft metals	Ambient or moderate temperature
Hydraulic grips	Parallel clamping Dedicated power unit Mechanical synchronization	50 to 2000 kN	Rebar, high-strength steels, short specimens, grooved, irregular	Ambient or thermal, high loads
Thermal grips	Compact design Heat-resistant materials Cooling possible Remote cylinder	Up to 150 kN	Small metallic specimens, polymers, fragile composites, hot tests	Climatic chamber, up to 350 °C
Interchangeable jaws	Flat smooth Serrated, rubber Wavy, diamond V-shaped Ø2 to 60 mm	—	Films, plastics, metals, textiles, round, profiled	All environments
Pneumatic grips	Integrated cylinder Quick clamping by pedal Multiple diameters	10 to 100 kN	Films, textiles, elastomers, flexible composites	Ambient or thermal, repetitive tests
Other tooling	Specific systems for cables, ropes – Special longitudinal tests	Variable	Ropes, cables, threaded rods, reinforced bars	On request