ASTM F543-A1 Bone Screw Torque Test, Torsional Testing Machine

ASTM F543 Annex 1 Torsional Properties of Bone Screws

ASTM F543 Annex 1 measures the uniformity of bone screw products and enables comparison to other different, yet similarly sized, products. The annex measures torsional yield strength, maximum torque, and breaking angle of the bone screw. Torsional yield strength is an important engineering parameter to prevent screws from breaking during insertion or removal. Breaking angle is a measure of screw ductility as it undergoes a torsional moment. A large break angle provides an early warning to the surgeon that the screw is reaching its maximum strength.

The UnitedTest torsion testing machine meets the requirements of ASTM F543 Appendix 1 (ASTM F543-A1). The capacity ranges from 10 Nm (90 in lbf) to over 30 Nm (270 in lbf) and supports both clockwise and counterclockwise modes. Each system includes a test controller, software, test bench, angular displacement sensor, and torque sensor. The specimen fixture seat or mechanical fixture fixes the bone screw to prevent it from rotating under force.The software continuously records the relationship between torque and rotation angle. The angular displacement scale has the sensitivity to accurately measure the offset of 2 ° angular displacement. Draw the relationship between torque and angle in the graphical test report. 

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