This standard covers the complete general and dimensional data for metric flat countersunk, oval countersunk and pan slotted and recessed head machine screws metric hex flange head machine screws recognized as standard. Also included are appendixes which provide specifications and instructions for protrusion gaging of flat countersunk head screws, across corners gaging of hex head screws, penetration gaging and wobble gaging of recessed head screws, set forth clearance hole recommendations, and establish the Government standard items and part numbering system. The inclusion of dimensional data in this Standard is not intended to imply that all of the products described are stock production sizes.