Another critical metric is the . This is often expressed as a minimum requirement relative to the nominal diameter of the screw. A deeper socket allows for higher torque transmission because the wrench is better supported along its length, reducing the cantilever bending moment that often snaps Allen keys.
ISO 7035 is an international standard published by the International Organization for Standardization (ISO) that specifies the requirements for a quality management system (QMS) for organizations involved in the design, development, production, installation, and servicing of medical devices. iso 7035 pdf