M3-M12 Material: Carbon steel Class 6 Standard available: DIN934 Hex Nut DIN934 We are factory specialized in manufacturing fastener since1992. We can assure You the good quality1) Standard: DIN, ANSI, B.S. JIS, ISO, GB and non-standards 2) Material: Carbon steel3) Grade: grade 4.8, 5.8, 6.8, 8.8, 10.9, 12.9 or in grade 2, 5, 8 4) Dimension: 1.6 mm-64mm, 1/8"--2" 5) Coating: Plain, Brass, black, ...