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Question :   What is DIN ?
Answer :   Deutsches Institut für Normung e.V. is the German national organization for standardization and is the German ISO member body. DIN is a German Registered Association headquartered in Berlin.
Answer :   DIN 933 & DIN 961 is Full Thead.
Answer :   DIN 931 & DIN 960 is Half Thread.
Answer :   DIN 934 is Hex Nut.
Answer :   DIN 912 is Socket Allen Cap Screw.
Answer :   DIN 916 is Socket Allen Set Screw.