M8 Nylon Insert Lock Nut Nyloc Type - Galvanised Mild Steel DIN985 These are tapped oversized threads to allow for galvanised layer on male thread d = 14.38 mm h = 8 mm m = 5.5 mm s = 13 mm thread pitch = 1.25 mm Nylon insert can be various colours (Usually Black / Dark BLue). Please ask if colour is important to you DIN985