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DIN 910 hexagon head screw plugs with collar/flange and cylindrical/straight/parallel thread are threaded plugs with an external hexagon head protruding from the collar end and cylindrical (parallel/straight) pipe thread along most of the length of the other end.
DIN 912 ISO 4762 ANSI B18.3.1M Grade: 4.8, 8.8, 10.9 and 12.9.
DIN 7991 hexagon socket cap screws have a flat countersunk head with an internal hexagonal drive suited for a hex.
ISO 7380 - 2004 Hexagon Socket Button Head Screws.
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