M3 Nylon Lock Nuts - SODIAL(R) M3 x 0.5mm Stainless Steel Nylock Nylon Insert Hex Lock Nuts 50pcs Product Name: Nylon Lock Nut Thread Size: M3 x 0.5mm(Dia * Pitch) Material: 304 Stainless Steel Height: 4mm/ 0.16" Hex Size: 5.5mm/ 0.21"