Tenders for Supply Of Item 1 Bolt Ms Black Hex. Head Round Body With Hex Nuts M12 X 50mm To Is.1363-1984 Part 1 & 3. Property Class Of Bolt Is 4.6 And Nut Is 4.0 Item 2 %a0bolts Ms Black Hex Head Round Body With Hex Nuts M-12 X 38 To Is 1363/1984, Part 1 & 3.the Property Class Of The Subject Item Would Be 4.6.