A2 A4 Steel Hexagon Full Nuts. A2 Stainless Steel For Corrosion ResistanceOR A4 Marine Grade Stainless Steel. M2 (0.40mm Pitch) 4mm 1.6mm. M2.5 (0.45mm Pitch) 5mm 2mm. M30 (3.50mm Pitch) 46mm 24mm. Nut Height.
eBay