DIN EN ISO 898-2 Compression test

When testing screws / fasteners, not only the screw itself must be tested (tensile test according to DIN EN ISO 898-1), but also the nut must withstand the required minimum forces according to DIN EN ISO 898-2.

This test is usually carried out in the screw industry using a compression test / test force test. In the event of an arbitration, this test must be carried out using a tensile test. Provided the quality of the nut complies with the standard values, this test is practically non-destructive: the nut is not stripped off / destroyed by the test mandrel. After the required test force has been applied for at least 15 seconds, the force is released. The nut is then removed from the test mandrel. This is usually done without tools - at least this must be possible after the first rotation.

The universal testing machine / In this test, the compression testing machine is used "only" to apply the test force. The test curve / diagram is for information purposes only. The respective maximum force and holding time serve to demonstrate the application of the test force.

DIN EN ISO 898 specifies tests on screws with a tensile force/compressive force of up to 600 kN. Therefore, a universal testing machine with a test force of 600 kN is usually used for screw testing. For nominal forces above 600 kN, the standard allows a hardness test as an alternative.

The GALDABINI Test software LabTest is particularly suitable for this test according to DIN EN ISO 898-2, as the various test forces can be stored in the software and selected via drop-down lists (FP Force test force). Furthermore, the required holding time can be set as standard (default) or another holding time can be selected from a list. The ramp time (time until the test force FP is reached) can also be selected (default set to 10 seconds).

Are you interested? Give us the opportunity to convince you of the quality of GALDABINI devices and arrange a demonstration now. During a visit to one of our customers or during a live demo via MS Teams / TeamViewer / ZOOM etc.

test procedure

• Select target force from drop-down list e.g. M16-8 – 176.600N
• Use ramp duration 10 seconds (or make another selection)
• Use hold time 15 seconds (or make other selection
• Insert test mandrel with screwed nut
• Automatically move to the starting position and start the test with F5
   

documentation in the test certificate
experimental conditions

• Nut size + target force FP
•  ramp duration (default 10 S)
• holding time FP seconds

Results – individually changeable

• Fm maximum force (overshoot) Newton
• Fmin and Fmax in holding phase Newton
• Actual holding time FP seconds
• Remark e.g. for failure type text