Fastener Testing Service
Application tests under later framework conditions
With our fastener testing service, our labs have the ability to set fasteners in your application in a way that simulates your production environment. Before we specify a fastening system, we carry out mechanical function tests such as push-out and torque tests with original materials for each application.
At the end of our application testing, we will provide you with a report of determined performance data including guaranteed performance values and safety buffers, as well as our recommendation of suitable fastening systems.
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Nondestructive Testing Methods
Nondestructive testing methods can be used to check the quality of a sheet metal joint without damaging the component. These methods make it possible to detect defects at a very early stage.
Visual inspection is a basic method for the rapid detection of existing defects. This inspection can be carried out either with the naked eye or with aids such as magnifying glasses, microscopes or special visual inspection systems. Sometimes light sources or illumination techniques such as fluorescent or UV light are used.
Typical defects to be detected are cracks, indentations, irregularities in the surface, incorrect positioning of the fastener, a gap between the fastener and the sheet material or visible thread damage.
A thread test ensures that the thread meets the required tolerances. Special gauges are used to check the thread geometry. By screwing in a thread gauge, the thread is checked for freedom of movement or deformation.
Defects to be detected in this case are damaged or deformed threads, incomplete threads or deviations in the thread geometry.
Destructive Testing Methods
In destructive test methods, the sheet metal joint is irreversibly damaged or destroyed in order to determine the maximum mechanical load capacity of the connection.
In a torque test, the resistance of the fastener to rotation in the sheet metal is tested. This measures the maximum torque required to rotate the set fastener.
To determine the torque, the fastener to be tested is placed in the sheet metal. The sheet metal component is then clamped in a testing device. When testing a clinch nut, a test bolt is screwed into the clinch nut on the sheet metal side, i.e. from below, and tightened continuously with a torque wrench until the required torque of the nut is reached.
The torque is increased until the clinch nut begins to rotate or is completely loosened. Similarly, a test nut is used when testing a clinch stud.
In a push out test, the maximum force required to press a fastener out of the sheet metal is determined.
The fastener to be tested is placed in the sheet metal and the component is then clamped in a testing device. When testing a clinch nut, a test bolt is screwed into the clinch nut on the sheet metal side. A continuously increasing force is then applied axially via this screw connection, from the side of the test bolt, until the required minimum nominal force of the nut is reached. The force is applied until the clinch nut is pressed out of the sheet metal. Similarly, a test nut is screwed onto the sheet metal side when testing clinch studs.
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