This listing is for new Metric Coarse (Standard) Nylon Insert Lock Nuts in Stainless Steel. These are made from A2 (18-8) Stainless Steel with a Grade 70 rating, or commonly just called A2-70. Available Sizes: M2.5 / 2.5mm x 0.45, M3 / 3mm x 0.50M4 / 4mm x 0.70, M5 / 5mm x 0.80M6 / 6mm x 1.0, M8 / 8mm x 1.25M10 / 10mm x 1.50, M12 / 12mm x 1.75M14 / 14mm x 2.00, M16 / 16mm x 2.00 Specification sheet for each item below:

Size:M3/M4/M5/M6/M8/M10/M12. Over-tightening may strip threads. ✓Fast Installation : Square shape allows wrench/piping pliers grip, 50% faster tightening. Material: A2 Stainless Steel. Grade 304 Stainless Steel : 18% chromium & 8% nickel (ASTM A276 certified), excels in corrosion resistance (500+ hours salt spray test).