Implants for osteosynthesis. Bone screws and auxiliary equipment - Specification for the mechanical requirements and test methods for screws having asymmetrical thread and spherical undersurface1 Scope This International Standard specifies the test methods for determining breaking torque and angle of rotation at failure for metal bone screws for surgery. Mechanical requirements for bone screws are specified in Annex A. NOTE 1 At present data are only available for bone screws with dimensions according to ISO 5835 and made from stainless steel according to ISO 5832 1. If data become available for bone screws made from other materials and or

2 Category of use (first digit)

Chairs and tables test personnel

Medical use

dishwashing and personal hygiene

Biometric technology acceptability

6g and 8g for external threads (bolts) where appropriate for:

corresponding to 0

The aluminium and mineral industry

including the use of electronic signatures and electronic copyright systems

For manufacturers and users of sterilization processes in health care settings for which a specific International Standard does not exist

NA to BS EN 1992-4 on UK National Annex to Eurocode is useful for:

the field of application