Serrated Flange Hex Lock Nuts Zinc 6,8,10,1/4,5/16,3/8,1/2,Up to 3/4 Coarse Fine
Serrated flange nuts are a hex nut with a large oversized base flaring out at the bottom of the nut. The bearing surface has serrations which displace material on the mating surface when the nut is wrenched into place.