Locknut Serrated Flange Steel Finish Zinc Plated Grade 2 Thread Size 1/2-20 Thread Type UNF Thread Direction Right Hand Width 3/4 In Height 29/64 In Flange Dia 1 1/32 In Flange Thickness 0.05 In For Use With Up to Grade 2 Bolts Resist Vibration Package Quantity 25