Nut Assortment Dimensional Standards ASME B 18.16.6 Includes Washers No Largest Thread Size 3/4 In.-10 Lock Type Nylon Insert Material Grade/Class Grade A Number of Nuts 450 Number of Thread Sizes 16 Number of Washers 0 Nut Finish Zinc Plated Nut Material Steel Smallest Thread Size 1/4 In.-28 Standards ASME B 18.16.6 System of Measurement Inch