Hexagon Socket Button Head Screws. ISO 7380-1 - 2011. Display drawing: 3D DRAWING. Download CAD Model * Download CAD Model. Download CAD Model * 3D DRAWING. Download CAD Model * ... Combined gauging of socket dimensions and , see ISO 23429. ②,80% of the value for F m.min specifies in ISO 898-1. ③,80% of the values for F m.min (R m.min × A ...