M3 x .5 A4-80 Stainless Steel DIN 934 Hex Nut / THREAD DIRECTION: RIGHT-HAND NUT STYLE: A12 HEXAGON NUT HEIGHT: 2.15 MILLIMETERS MINIMUM AND 2.40 MILLIMETERS MAXIMUM END ITEM IDENTIFICATION: ICU2 WIDTH ACROSS FLATS: 5.32 MILLIMETERS MINIMUM AND 5.50 MILLIMETERS MAXIMUM THREAD SERIES: M NOMINAL THREAD SIZE: 3.0 MILLIMETERS THREAD PITCH IN MILLIMETERS: 0.5 BEARING SURFACE TYPE: FLAT MATERIAL: STEEL CORROSION RESISTING OVERALL SURFACE TREATMENT: PASSIVATE OVERALL SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: ASTM A380/A380M ASSN STD SINGLE TREATMENT RESPONSE OVERALL