Hex Nut M20 (pitch 2.5) Steel Zinc plated 20 000 pcs. Lock Nut M20 (pitch 2.5) Steel Zinc plated 20 000 pcs. Spring washer M20 Steel 8.8 Zinc plated 20 000 pcs. Flat Washer M20 Steel Zinc plated 20 000 pcs.