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Tensile Testing machines perform tension or tensile tests on materials and products.

Tensile testing helps select materials and ensure quality for engineering applications. In addition, tensile properties can predict material behavior under forms of loading other than tension. Material strength is of primary concern. Strength may be measured as stress necessary to cause plastic deformation or maximum stress the material can withstand. Material ductility measures how much it can be deformed before it fractures. Ductility is included in material specifications to ensure quality and toughness. Tensile tests are the most common material strength test and measure properties such as yield strength, modulus, ultimate tensile strength, possons ratio, reduction of area and elongation to failure. Specimens are gripped in multiple ways including mechanical clevis grips, threaded grips, vise action, hydraulic action and air grips.

There are many standard test methods: ASTM E-8 (metals), ASTM D-638 (plastics), ASTM D-412 (rubber), ASTM D3039 (polymer matrix composites).

ASTM D638 determines flexural properties of plastics, high modulus composites and insulating materials.

Test parameters to configure a test system include load, speed of loading, test method type, sample geometry, and maximum sample elongation. Test sample thicknesses and types affect equipment requirements.