DIN 7991 - Hexagon socket screws 

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ISO 10642 / DIN 7991 - Hexagon socket screws

ISO 10642 / DIN 7991 - Hexagon socket screws

ISO 10642 / DIN 7991 - Hexagon socket screws

Hexagon socket countersunk head screws, ISO 10642 or DIN 7991 and full or partial thread depending on manufacturer