Hex Locknut Assortment Includes Washers No Largest Thread Size M20-2.50 Lock Type Nylon Insert Number of Nuts 319 Number of Thread Sizes 16 Number of Washers 0 Nut Finish Zinc Plated Nut Material Steel Nut Type Hex Lock Nut Smallest Thread Size M3-0.50 System of Measurement Metric Thread Sizes M10-1.25 M10-1.5 M12-1.5 M12-1.75 M14-1.5 M14-2.0 M16-1.5 M18-2.5 M20-2.5 M3-0.5 M4-0.7 M5-0.8 M6-1.0 M7-1.0 M8-1.25