Flat washer 1) DIN125 / DIN9021 2) carton steel, Q235 3) EG, ... coat ,HDG, Plain,etc. 4) ISO9001:2000 The specification of Flat Waher:(1) Standard:DIN125, DIN9021(2) Material: carton steel, steel ... , low carton steel, Q235(3) Grade: 4.8 or depending on your requirements(4) Dimension: M6 to M64 ; 1/4'' ---2 ...