Slotted nut(castle nut ), lock nut, flange nut, with different sizes :1/4''-20, 5/16''-18, 3/8''-16, 1/2''-13 ,

We supply Slotted nut(castle nut ), lock nut, flange nut, with different sizes :1/4''-20, 5/16''-18, 3/8''-16, 1/2''-13 , and surface finish: Zinc, bonus, cobalt , nickel , alloy plated 

slotted nut ,castle nut ,flange nut