We offer various test methods for the mechanical characterization and classification of bone screws in accordance with ASTM F543. Together with you, we select the appropriate test procedures from the following range to suit your specific screw design:

Test method for determining torsional properties
The bone screw is clamped in a fixture and loaded at a constant rotational speed (1–5 rpm) while a torque–rotation angle curve is recorded. This curve is then evaluated with respect to yield point, maximum torsional moment, and fracture angle, enabling a qualitative comparison of different screws.
Test method for determining insertion and removal torque
The screw is inserted into a standardized test block under a constant axial load and at a constant rotational speed (1–5 rpm), and subsequently removed, in order to determine material-independent comparative values for insertion and removal torque.
Test method for determining axial pull-out strength
The screw is inserted into a standardized test block at a constant rotational speed (3 rpm) up to a defined insertion depth and subsequently pulled out axially at a constant speed (5 mm/min) until the screw loosens or fails.
Test method for determining the cutting performance of self-tapping bone screws
To determine the axial force at which the self-tapping action of the screw begins, the screw is inserted into a pre-drilled test block at increasing axial force (1–3 N/s) and a rotational speed of 30 rpm.
Classification of metallic bone screws
Based on various geometric characteristics, screws are classified into categories HA, HB, HC, and HD.
Classification of the connection between screw head and bit
Based on various geometric characteristics, the connections between screw head and bit (drive connection) are specified.

In addition to the mechanical characterization and classification of bone screws, we are also pleased to advise you on correct labeling, packaging, and the content of the manufacturer information to be provided with the product.