These custom knurled nylon insert lock nuts were manufactured using SAE J995 class 8 material with zinc clear finish. 3/8-24 internal thread was incorporated with a 45 degree chamfer and a .551-.562 across the flats hex was formed over the nylon insert. Overall length measured at .519 +/-.03″ and the knurled portion measured approximately .34″ in length. This was a tricky part to tool for and to produce – it took us two sample runs to finally get everything dialed in.