ISO 6475 Bone Screw Torsion Test Methods | Equipment

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ISO 6475 provides a standard test method for determining the breaking torque and rotation at failure of metal bone screws. Test procedures for ISO 6475 are very simple, requiring that the screw be gripped to prevent slipping, torque is applied at a uniform angular velocity between 1 rpm and 5 rpm, and the ability to record maximum breaking torque and angle of rotation at failure. The test does not provide requirements for screw dimensions, but most tests are conducted on production screws meeting the HA, HB, HC, or HD specifications.

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