This standard defines the minimum clearance area required around nuts and bolt heads when using either
double hexagon box or socket wrenches defined in AECMA standard.
EN 3819:2008 Referenced Document
EN 3710 Aerospace series - Sockets, bi-hexagonal - Technical Specification
EN 3711 Aerospace series - Wrench-double ended, bi-hexagonal - Straight, cranked, offset
EN 3819:2008 history
2008EN 3819:2008 Aerospace series - Clearance for wrenches and sockets