DIN 51221, Werkstoffprüfmaschinen; Zugprüfmaschinen (Materials testing machines; Tensile testing machines), is the requirements for testing machines for the procedure described below.
Current status: withdrawn in 1993. The current document for this test is DIN EN ISO 7500-1 for the force verification of uniaxial testing machines, with general requirements in DIN 51220. Work to the current document unless a contract or drawing names this one explicitly.
Below you can find the products in our catalog that support this standard and the related testing workflow.
Eccentric roller grips are built for low-force tensile testing of thin, soft, and flexible specimens such as rubber sheets, plastic film, and deformable materials. Their cam-driven roller mechanism increases clamping pressure as tensile load rises, helping prevent slippage without damaging delicate surfaces. Compatible with NextGen NG-EML and SHM systems, they support repeatable alignment and accurate testing of narrow specimens.
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Pneumatic grips provide fast, repeatable air-actuated clamping for universal testing machines in high-throughput tensile and compression workflows. Designed for wires, composites, polymers, films, fabrics, and other materials, they apply uniform gripping pressure while reducing operator fatigue and sample loading time. Side-action, wedge-action, and snubbing configurations, plus interchangeable jaw faces, support secure holding across varied specimen geometries and standards.
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