Cross Recessed Countersunk (Flat) Head Screws (Countersunk Heads according to ISO)
Normally these screws are made in the sizes !or which weight details are given.
If the screws are to be supplied with captive washer components, the designation must be augmented according to DIN 6900.

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Slotted cheese head screws – Product grade A
Mechanical properties of fasteners made of carbon steel and alloy steel — Part 1: Bolts, screws and studs with specified property classes — Coarse thread and fine pitch thread
QUENCHED AND TEMPERED ALLOY STEEL BOLTS, STUDS, AND OTHER EXTERNALLY THREADED FASTENERS
Sechskantschrauben mit Flansch – schwere Reihe – Deutsche Fassung EN 1665 : 1997
Slotted set screws
Hexagon nuts, style 2, with metric fine pitch thread – Product grades A and B (ISO 8674 :1988) English version of DIN EN 28 674