ASTM F543-A2 Driving Torque test of Medical Bone Screws

ASTM F543 Annex 2 Driving Torque for Medical Bone Screws

ASTM F543 Appendix 2 measures the torque required to drive the bone screw into the defined standard material of the simulated bone. This testing method helps maintain the uniformity of the product.

Test steps: 

Use the matching tool to screw the sample into the test block.

Apply torque to the screw head at a speed of 3r/min using a torsion testing machine.

Record the maximum torque for the first 4 turns as the screw in torque, and for the reverse rotation of 4 turns, record the maximum torque as the spin out torque.

Apply an axial load not exceeding 11.17N during the process of screwing in and out.

Insertion torque testing helps prevent screw failure during insertion. The insertion torque is much smaller than the torsional yield strength of the screw and its screwdriver head.

The disassembly torque test helps to prevent screw failure during the disassembly process. The disassembly torque is also much smaller than the torsional yield strength of the screw and its screwdriver head. 

In both tests, the torque motor was driven at a rate of 1 to 5 RPM.

UnitedTest metal bone screw torque testing machine used to execute the ASTM F543-A2 test.  

For more information or details, please contact us:

Email: export@unitedtest.com 

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