AN310-4 castle nut with 1/4-28 thread for use with drilled bolts and cotter pins. Cadmium plated steel per QQ-P-416 Type II Class 2.AN310-4 - Castle nut, 1/4-28 threadSKU: AN310-4$1.00PriceMaterialSteelFinishCadmium PlatedDrill OptionN/AQuantity*Add to CartSpecificationsAN310-4Cross ReferencesAN310-4Technical Details1/4-28ApplicationsAN310/AN320 Castle Nuts